diff --git a/packages/paperclip-runner/docs/capability-semantic-tools.md b/packages/paperclip-runner/docs/capability-semantic-tools.md
index dff75b3b022..ee5ae11d7be 100644
--- a/packages/paperclip-runner/docs/capability-semantic-tools.md
+++ b/packages/paperclip-runner/docs/capability-semantic-tools.md
@@ -26,7 +26,7 @@ list, not a disposition — they are never exposed as tools. See
 [capability disposition](capability-disposition.md) and
 [authorization and exposure](capability-authorization-and-exposure.md).
 
-The catalog holds **38 tools**: 14 always-agent tools and 24 optional tools
+The catalog holds **39 tools**: 14 always-agent tools and 25 optional tools
 across 10 groups.
 
 <!-- These counts are drift-checked against src/tools/capability-semantic-tool-catalog.ts
@@ -39,12 +39,12 @@ by src/catalog/catalog-docs.test.ts; update the catalog, not the numbers. -->
 `finish_task`, `block_task`, `request_review`, `write_document`,
 `request_human_input`, `register_deliverable`, `inspect_operation_result`.
 
-### Optional tools (24), by group
+### Optional tools (25), by group
 
 | Group | Tools |
 | --- | --- |
 | discovery | `search_tasks`, `list_agents`, `list_projects`, `list_goals` |
-| delegation_dependencies | `create_task`, `set_dependencies` |
+| delegation_dependencies | `create_task`, `reassign_task`, `set_dependencies` |
 | governance | `list_approvals`, `request_approval`, `decide_approval`, `comment_on_approval` |
 | cases | `list_cases`, `upsert_case` |
 | workspace_runtime | `get_workspace_runtime`, `control_workspace_service` |
@@ -96,3 +96,24 @@ that every optional group is present.
 - [Authorization and exposure](capability-authorization-and-exposure.md)
 - [Mock ControlPlanePort](capability-mock-control-plane-port.md)
 - [Eval conformance](capability-eval-conformance.md)
+
+## Reassigning existing tasks
+
+`reassign_task` moves another existing company task to an eligible agent. Read
+`search_tasks` first and send the observed `expectedAssigneeActorId` (nullable)
+and `expectedStatusVersion`, the new `assigneeActorId`, a handoff `reason`, and a
+stable `idempotencyKey`. It requires `delegation:tasks:assign` and production
+`tasks:assign` authorization in standard mode. The same task retains its
+documents, dependencies, scope, priority, and history.
+
+The old execution and any live goal must stop before ownership changes. Active
+work returns to todo; backlog and blocked work retain their status and are not
+started. Assignment changes advance the observed version, including ordinary
+API changes, to reject stale handoffs. A durable audit receipt makes retries
+idempotent across caller runs; retrying after failed dispatch repairs the wake
+with a stable key and an owner/status/version guard.
+
+The current caller task, conversations, human-assigned tasks, completed or
+cancelled tasks, and pending reviews cannot be reassigned with this tool. Use
+`create_task` to delegate new work from the current task. A stop failure or
+concurrent ownership change fails without applying the handoff.
diff --git a/packages/paperclip-runner/generated/capability/semantic-tool-contracts.json b/packages/paperclip-runner/generated/capability/semantic-tool-contracts.json
index 4c4c24b0180..191865ceeed 100644
--- a/packages/paperclip-runner/generated/capability/semantic-tool-contracts.json
+++ b/packages/paperclip-runner/generated/capability/semantic-tool-contracts.json
@@ -1 +1 @@
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key.","maxLength":120,"minLength":1,"type":"string"}},"required":["key"],"type":"object"},"name":"read_document","outputSchema":{"additionalProperties":true,"type":"object"}},{"annotations":{"exposure":"always","operationId":"list_document_revisions","requiredClaims":[],"semanticContract":"paperclip.semantic-tool.v1","version":1},"description":"Read bounded revision history for one active-task document.","inputSchema":{"additionalProperties":false,"properties":{"key":{"description":"Stable issue-document key.","maxLength":120,"minLength":1,"type":"string"},"limit":{"default":50,"maximum":200,"minimum":1,"type":"integer"}},"required":["key"],"type":"object"},"name":"list_document_revisions","outputSchema":{"additionalProperties":true,"type":"object"}},{"annotations":{"exposure":"always","operationId":"report_progress","requiredClaims":[],"semanticContract":"paperclip.semantic-tool.v1","version":1},"description":"Append a durable progress comment to the active 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command identifier.","maxLength":200,"minLength":1,"type":"string"},"disposition":{"enum":["applied","duplicate"]},"entityRefs":{"description":"Entities affected by the operation.","items":{"minLength":1,"type":"string"},"maxItems":200,"type":"array","uniqueItems":true},"scheduledWakeIds":{"description":"Wake identifiers scheduled by the operation.","items":{"minLength":1,"type":"string"},"maxItems":200,"type":"array","uniqueItems":true},"stateRevision":{"minimum":0,"type":"integer"}},"required":["commandId","disposition","stateRevision","entityRefs","scheduledWakeIds"],"type":"object"}},{"annotations":{"exposure":"optional","operationId":"create_task","requiredClaims":["delegation:tasks:create"],"semanticContract":"paperclip.semantic-tool.v1","version":1},"description":"Create a project task from a conversation, or a child from an ordinary task. Persist initialPlan before execution.","inputSchema":{"additionalProperties":false,"properties":{"assigneeActorId":{"description":"Optional agent assignee. Omit to assign the current agent.","maxLength":20000,"type":["string","null"]},"blockedByTaskIds":{"description":"Initial blocker task ids.","items":{"minLength":1,"type":"string"},"maxItems":200,"type":"array","uniqueItems":true},"description":{"description":"Child task description.","maxLength":20000,"type":["string","null"]},"idempotencyKey":{"description":"Caller-stable retry key.","maxLength":240,"minLength":1,"type":"string"},"initialPlan":{"description":"Relevant markdown plan saved on the new task before execution starts.","maxLength":200000,"type":["string","null"]},"priority":{"enum":["critical","high","medium","low"]},"projectId":{"description":"Project ID for the task.","type":["string","null"]},"title":{"description":"Child task title.","maxLength":500,"minLength":1,"type":"string"}},"required":["idempotencyKey","title"],"type":"object"},"name":"create_task","outputSchema":{"additionalProperties":false,"properties":{"commandId":{"description":"Stable command 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posture.","inputSchema":{"additionalProperties":false,"properties":{"approvalType":{"description":"Stable approval type.","maxLength":200,"minLength":1,"type":"string"},"idempotencyKey":{"description":"Caller-stable retry key.","maxLength":240,"minLength":1,"type":"string"},"payload":{"additionalProperties":true,"type":"object"}},"required":["idempotencyKey","approvalType","payload"],"type":"object"},"name":"request_approval","outputSchema":{"additionalProperties":false,"properties":{"commandId":{"description":"Stable command identifier.","maxLength":200,"minLength":1,"type":"string"},"disposition":{"enum":["applied","duplicate"]},"entityRefs":{"description":"Entities affected by the operation.","items":{"minLength":1,"type":"string"},"maxItems":200,"type":"array","uniqueItems":true},"scheduledWakeIds":{"description":"Wake identifiers scheduled by the operation.","items":{"minLength":1,"type":"string"},"maxItems":200,"type":"array","uniqueItems":true},"stateRevision":{"minimum":0,"type":"integer"}},"required":["commandId","disposition","stateRevision","entityRefs","scheduledWakeIds"],"type":"object"}},{"annotations":{"exposure":"optional","operationId":"decide_approval","requiredClaims":["governance:approvals:decide"],"semanticContract":"paperclip.semantic-tool.v1","version":1},"description":"Decide an approval as an explicitly authorized approver.","inputSchema":{"additionalProperties":false,"properties":{"approvalId":{"description":"Approval id.","maxLength":200,"minLength":1,"type":"string"},"decision":{"enum":["approved","rejected","cancelled"]},"idempotencyKey":{"description":"Caller-stable retry key.","maxLength":240,"minLength":1,"type":"string"},"note":{"description":"Decision note.","maxLength":20000,"minLength":1,"type":"string"}},"required":["idempotencyKey","approvalId","decision","note"],"type":"object"},"name":"decide_approval","outputSchema":{"additionalProperties":false,"properties":{"commandId":{"description":"Stable command identifier.","maxLength":200,"minLength":1,"type":"string"},"disposition":{"enum":["applied","duplicate"]},"entityRefs":{"description":"Entities affected by the operation.","items":{"minLength":1,"type":"string"},"maxItems":200,"type":"array","uniqueItems":true},"scheduledWakeIds":{"description":"Wake identifiers scheduled by the operation.","items":{"minLength":1,"type":"string"},"maxItems":200,"type":"array","uniqueItems":true},"stateRevision":{"minimum":0,"type":"integer"}},"required":["commandId","disposition","stateRevision","entityRefs","scheduledWakeIds"],"type":"object"}},{"annotations":{"exposure":"optional","operationId":"comment_on_approval","requiredClaims":["governance:approvals:comment"],"semanticContract":"paperclip.semantic-tool.v1","version":1},"description":"Add a durable comment to an approval.","inputSchema":{"additionalProperties":false,"properties":{"approvalId":{"description":"Approval id.","maxLength":200,"minLength":1,"type":"string"},"body":{"description":"Approval comment.","maxLength":20000,"minLength":1,"type":"string"},"idempotencyKey":{"description":"Caller-stable retry key.","maxLength":240,"minLength":1,"type":"string"}},"required":["idempotencyKey","approvalId","body"],"type":"object"},"name":"comment_on_approval","outputSchema":{"additionalProperties":false,"properties":{"commandId":{"description":"Stable command identifier.","maxLength":200,"minLength":1,"type":"string"},"disposition":{"enum":["applied","duplicate"]},"entityRefs":{"description":"Entities affected by the operation.","items":{"minLength":1,"type":"string"},"maxItems":200,"type":"array","uniqueItems":true},"scheduledWakeIds":{"description":"Wake identifiers scheduled by the operation.","items":{"minLength":1,"type":"string"},"maxItems":200,"type":"array","uniqueItems":true},"stateRevision":{"minimum":0,"type":"integer"}},"required":["commandId","disposition","stateRevision","entityRefs","scheduledWakeIds"],"type":"object"}},{"annotations":{"exposure":"optional","operationId":"schedule_wake","requiredClaims":["control_plane:wakes"],"semanticContract":"paperclip.semantic-tool.v1","version":1},"description":"Schedule a deterministic continuation wake.","inputSchema":{"additionalProperties":false,"properties":{"delayTicks":{"maximum":10000,"minimum":1,"type":"integer"},"idempotencyKey":{"description":"Caller-stable retry key.","maxLength":240,"minLength":1,"type":"string"},"payload":{"additionalProperties":true,"type":"object"},"reason":{"enum":["manual","issue_commented","interaction_resolved","approval_resolved","blockers_resolved","scheduled_retry","resume"]}},"required":["idempotencyKey","reason","delayTicks"],"type":"object"},"name":"schedule_wake","outputSchema":{"additionalProperties":false,"properties":{"commandId":{"description":"Stable command identifier.","maxLength":200,"minLength":1,"type":"string"},"disposition":{"enum":["applied","duplicate"]},"entityRefs":{"description":"Entities affected by the operation.","items":{"minLength":1,"type":"string"},"maxItems":200,"type":"array","uniqueItems":true},"scheduledWakeIds":{"description":"Wake identifiers scheduled by the operation.","items":{"minLength":1,"type":"string"},"maxItems":200,"type":"array","uniqueItems":true},"stateRevision":{"minimum":0,"type":"integer"}},"required":["commandId","disposition","stateRevision","entityRefs","scheduledWakeIds"],"type":"object"}},{"annotations":{"exposure":"optional","operationId":"generic_api_request","requiredClaims":["test:generic_api_request"],"semanticContract":"paperclip.semantic-tool.v1","version":1},"description":"Test-only escape hatch. Disabled unless the scenario and explicit claim both enable it.","inputSchema":{"additionalProperties":false,"properties":{"body":{"additionalProperties":true,"type":"object"},"method":{"enum":["GET","POST","PATCH"]},"path":{"maxLength":500,"pattern":"^/mock/","type":"string"}},"required":["method","path"],"type":"object"},"name":"generic_api_request","outputSchema":{"additionalProperties":true,"type":"object"}},{"annotations":{"exposure":"optional","operationId":"search_api","requiredClaims":["api:discover"],"semanticContract":"paperclip.semantic-tool.v1","version":1},"description":"Fallback only: discover Paperclip API operations when the available dedicated tools cannot express the task. Prefer dedicated tools for common operations; do not search before using them.","inputSchema":{"additionalProperties":false,"properties":{"cursor":{"maxLength":200,"type":"string"},"limit":{"default":5,"maximum":10,"minimum":1,"type":"integer"},"query":{"maxLength":500,"minLength":1,"type":"string"}},"required":["query"],"type":"object"},"name":"search_api","outputSchema":{"additionalProperties":true,"type":"object"}},{"annotations":{"exposure":"optional","operationId":"call_api","requiredClaims":["api:call"],"semanticContract":"paperclip.semantic-tool.v1","version":1},"description":"Fallback only: call a discovered Paperclip API operation when dedicated tools lack the required operation or parameters. Uses your existing permissions. Prefer dedicated tools; never bypass a denial or runner lifecycle tool.","inputSchema":{"additionalProperties":false,"properties":{"body":{"anyOf":[{"additionalProperties":true,"type":"object"},{"items":{},"type":"array"},{"type":"string"},{"type":"number"},{"type":"boolean"},{"type":"null"}],"description":"Request value matching the discovered schema. For JSON object or array requests, pass the object or array directly, never a JSON-encoded string. Strings are for text bodies or endpoints whose schema explicitly accepts a string."},"contentType":{"maxLength":120,"type":"string"},"files":{"items":{"additionalProperties":false,"oneOf":[{"properties":{"artifactId":{}},"required":["artifactId"]},{"properties":{"path":{}},"required":["path"]}],"properties":{"artifactId":{"type":"string"},"field":{"type":"string"},"path":{"description":"File relative to the active issue workspace. Remote files must first be uploaded as an artifact.","type":"string"}},"type":"object"},"maxItems":10,"type":"array"},"operationId":{"description":"Exact operationId returned by search_api, for example GET /api/projects/{id}. Do not guess identifiers.","maxLength":500,"minLength":1,"type":"string"},"pathParams":{"additionalProperties":{"type":"string"},"type":"object"},"query":{"additionalProperties":true,"type":"object"}},"required":["operationId"],"type":"object"},"name":"call_api","outputSchema":{"additionalProperties":true,"type":"object"}},{"annotations":{"exposure":"optional","operationId":"create_project","requiredClaims":[],"semanticContract":"paperclip.semantic-tool.v1","version":1},"description":"Create a project after considering existing projects and available repositories. repositoryIds and repositoryUrls accept multiple existing repositories. Use HTTPS GitHub repositoryUrls when an accessible repo is not in the catalog; this registers project repositories, not remote GitHub repositories. Non-code projects may omit repositories. Cannot combine repositoryIds/repositoryUrls with workspace. Reuse the idempotency key on retries.","inputSchema":{"additionalProperties":false,"properties":{"archivedAt":{"description":"Archive timestamp.","maxLength":20000,"type":["string","null"]},"color":{"description":"Project color.","maxLength":20000,"type":["string","null"]},"description":{"description":"Project outcome and context.","maxLength":20000,"type":["string","null"]},"env":{"additionalProperties":true,"type":"object"},"executionWorkspacePolicy":{"additionalProperties":true,"type":"object"},"goalId":{"description":"Goal ID.","maxLength":20000,"type":["string","null"]},"goalIds":{"description":"Goal IDs.","items":{"minLength":1,"type":"string"},"maxItems":200,"type":"array","uniqueItems":true},"icon":{"description":"Project icon.","enum":["folder","rocket","code","terminal","database","globe","package","boxes","box","layers","briefcase","compass","target","flame","zap","star","bug","wrench","hammer","lightbulb","sparkles","shield","lock","search","cog","brain","cpu","git-branch","file-code","puzzle","gem","atom","heart","mail","message-square","crown","radar","telescope","hexagon",null],"type":["string","null"]},"idempotencyKey":{"description":"Caller-stable retry key.","maxLength":240,"minLength":1,"type":"string"},"leadAgentId":{"description":"Lead agent ID.","maxLength":20000,"type":["string","null"]},"name":{"description":"Project name.","maxLength":500,"minLength":1,"type":"string"},"repositoryIds":{"description":"Authorized repository IDs from list_project_repositories; may contain multiple repositories.","items":{"minLength":1,"type":"string"},"maxItems":200,"type":"array","uniqueItems":true},"repositoryUrls":{"description":"Existing HTTPS GitHub repository URLs, including repos absent from the catalog.","items":{"maxLength":2000,"pattern":"^https://github\\.com/(?!\\.{1,2}/)[A-Za-z0-9_.-]+/(?!\\.{1,2}/?$)[A-Za-z0-9_.-]+/?$","type":"string"},"maxItems":100,"type":"array"},"status":{"enum":["backlog","planned","in_progress","completed","cancelled"]},"targetDate":{"description":"Target date.","maxLength":20000,"type":["string","null"]},"workspace":{"additionalProperties":true,"type":"object"}},"required":["idempotencyKey","name"],"type":"object"},"name":"create_project","outputSchema":{"additionalProperties":true,"type":"object"}},{"annotations":{"exposure":"optional","operationId":"list_project_repositories","requiredClaims":[],"semanticContract":"paperclip.semantic-tool.v1","version":1},"description":"List authorized repositories with stable IDs and names. Consider appropriate repositories before creating a project; never invent IDs.","inputSchema":{"additionalProperties":false,"properties":{},"required":[],"type":"object"},"name":"list_project_repositories","outputSchema":{"additionalProperties":true,"type":"object"}},{"annotations":{"exposure":"optional","operationId":"list_projects","requiredClaims":["discovery:projects:read"],"semanticContract":"paperclip.semantic-tool.v1","version":1},"description":"Inspect available company projects before selecting a project for new work.","inputSchema":{"additionalProperties":false,"properties":{},"required":[],"type":"object"},"name":"list_projects","outputSchema":{"additionalProperties":true,"type":"object"}},{"annotations":{"exposure":"optional","operationId":"create_skill","requiredClaims":[],"semanticContract":"paperclip.semantic-tool.v1","version":1},"description":"Create a reusable single-file skill in the company library. Supply a complete SKILL.md whose name and description match the inputs. This saves the skill and shows a card; it does not assign the skill to any agent. Reuse idempotencyKey on retries.","inputSchema":{"additionalProperties":false,"properties":{"description":{"maxLength":2000,"minLength":1,"type":"string"},"idempotencyKey":{"maxLength":240,"minLength":1,"type":"string"},"markdown":{"description":"Complete SKILL.md including name and description frontmatter and substantive instructions.","maxLength":200000,"minLength":1,"type":"string"},"name":{"description":"Lowercase skill name, matching SKILL.md frontmatter.","maxLength":120,"minLength":1,"pattern":"^[a-z0-9]+(?:-[a-z0-9]+)*$","type":"string"},"slug":{"description":"Optional; must equal name.","maxLength":120,"minLength":1,"pattern":"^[a-z0-9]+(?:-[a-z0-9]+)*$","type":"string"}},"required":["idempotencyKey","name","description","markdown"],"type":"object"},"name":"create_skill","outputSchema":{"additionalProperties":true,"type":"object"}},{"annotations":{"exposure":"optional","operationId":"reassign_task","requiredClaims":["delegation:tasks:assign"],"semanticContract":"paperclip.semantic-tool.v1","version":1},"description":"Reassign an existing task to another company agent. Read search_tasks first and supply its current assignee and statusVersion to prevent overwriting a concurrent change. Preserve the task, documents, dependencies, and blocked/backlog status. Active work is stopped before handoff. Use a stable idempotency key for retries. Cannot reassign this run’s own task, conversations, completed tasks, or pending reviews; use create_task for delegation from the current task.","inputSchema":{"additionalProperties":false,"properties":{"assigneeActorId":{"description":"New company agent ID from list_agents.","minLength":1,"type":"string"},"expectedAssigneeActorId":{"description":"Current assigneeAgentId from search_tasks; null means unassigned.","type":["string","null"]},"expectedStatusVersion":{"description":"Current statusVersion from search_tasks.","minimum":0,"type":"integer"},"idempotencyKey":{"description":"Caller-stable retry key.","maxLength":240,"minLength":1,"type":"string"},"reason":{"description":"Why the task should move and context for the new owner.","maxLength":20000,"minLength":1,"type":"string"},"taskId":{"description":"Existing task ID from search_tasks.","minLength":1,"type":"string"}},"required":["idempotencyKey","taskId","assigneeActorId","expectedAssigneeActorId","expectedStatusVersion","reason"],"type":"object"},"name":"reassign_task","outputSchema":{"additionalProperties":false,"properties":{"commandId":{"description":"Stable command identifier.","maxLength":200,"minLength":1,"type":"string"},"disposition":{"enum":["applied","duplicate"]},"entityRefs":{"description":"Entities affected by the operation.","items":{"minLength":1,"type":"string"},"maxItems":200,"type":"array","uniqueItems":true},"scheduledWakeIds":{"description":"Wake identifiers scheduled by the operation.","items":{"minLength":1,"type":"string"},"maxItems":200,"type":"array","uniqueItems":true},"stateRevision":{"minimum":0,"type":"integer"}},"required":["commandId","disposition","stateRevision","entityRefs","scheduledWakeIds"],"type":"object"}}]
diff --git a/packages/paperclip-runner/generated/semantic-action-catalog.json b/packages/paperclip-runner/generated/semantic-action-catalog.json
index 90644e83e5e..a4d56399559 100644
--- a/packages/paperclip-runner/generated/semantic-action-catalog.json
+++ b/packages/paperclip-runner/generated/semantic-action-catalog.json
@@ -1522,6 +1522,119 @@
     "title": "Control workspace service",
     "version": 1
   },
+  {
+    "allowedModes": [
+      "standard",
+      "skill_test"
+    ],
+    "description": "Reassign an existing task to another company agent. Read search_tasks first and supply its current assignee and statusVersion to prevent overwriting a concurrent change. Preserve the task, documents, dependencies, and blocked/backlog status. Active work is stopped before handoff. Use a stable idempotency key for retries. Cannot reassign this run’s own task, conversations, completed tasks, or pending reviews; use create_task for delegation from the current task.",
+    "effect": "write",
+    "inputSchema": {
+      "additionalProperties": false,
+      "properties": {
+        "assigneeActorId": {
+          "description": "New company agent ID from list_agents.",
+          "minLength": 1,
+          "type": "string"
+        },
+        "expectedAssigneeActorId": {
+          "description": "Current assigneeAgentId from search_tasks; null means unassigned.",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "expectedStatusVersion": {
+          "description": "Current statusVersion from search_tasks.",
+          "minimum": 0,
+          "type": "integer"
+        },
+        "idempotencyKey": {
+          "description": "Caller-stable retry key.",
+          "maxLength": 240,
+          "minLength": 1,
+          "type": "string"
+        },
+        "reason": {
+          "description": "Why the task should move and context for the new owner.",
+          "maxLength": 20000,
+          "minLength": 1,
+          "type": "string"
+        },
+        "taskId": {
+          "description": "Existing task ID from search_tasks.",
+          "minLength": 1,
+          "type": "string"
+        }
+      },
+      "required": [
+        "idempotencyKey",
+        "taskId",
+        "assigneeActorId",
+        "expectedAssigneeActorId",
+        "expectedStatusVersion",
+        "reason"
+      ],
+      "type": "object"
+    },
+    "operationId": "reassign_task",
+    "outputSchema": {
+      "additionalProperties": false,
+      "properties": {
+        "commandId": {
+          "description": "Stable command identifier.",
+          "maxLength": 200,
+          "minLength": 1,
+          "type": "string"
+        },
+        "disposition": {
+          "enum": [
+            "applied",
+            "duplicate"
+          ]
+        },
+        "entityRefs": {
+          "description": "Entities affected by the operation.",
+          "items": {
+            "minLength": 1,
+            "type": "string"
+          },
+          "maxItems": 200,
+          "type": "array",
+          "uniqueItems": true
+        },
+        "scheduledWakeIds": {
+          "description": "Wake identifiers scheduled by the operation.",
+          "items": {
+            "minLength": 1,
+            "type": "string"
+          },
+          "maxItems": 200,
+          "type": "array",
+          "uniqueItems": true
+        },
+        "stateRevision": {
+          "minimum": 0,
+          "type": "integer"
+        }
+      },
+      "required": [
+        "commandId",
+        "disposition",
+        "stateRevision",
+        "entityRefs",
+        "scheduledWakeIds"
+      ],
+      "type": "object"
+    },
+    "placement": "optional",
+    "requiredClaims": [
+      "delegation:tasks:assign"
+    ],
+    "schema": "paperclip.semantic-action.v1",
+    "title": "Reassign task",
+    "version": 1
+  },
   {
     "allowedModes": [
       "standard",
diff --git a/packages/paperclip-runner/protocol/fixtures/evals/native-execution-seeded.json b/packages/paperclip-runner/protocol/fixtures/evals/native-execution-seeded.json
index 4092923f2b9..acc277d67ec 100644
--- a/packages/paperclip-runner/protocol/fixtures/evals/native-execution-seeded.json
+++ b/packages/paperclip-runner/protocol/fixtures/evals/native-execution-seeded.json
@@ -24,7 +24,7 @@
     "prpVersion": 1,
     "nativeExecutionVersion": 1,
     "catalogVersion": 1,
-    "catalogSha256": "sha256:cf243ac6e38f931e556db65b7593f7ed58ffb4d0a2543c90219b0cc723840196",
+    "catalogSha256": "sha256:6b9eeb1ef2fe014bacc9d1acbb443ffdbe9588167c5b808e2ff6f5e6add20a33",
     "driverContractVersion": 1,
     "driverKind": "paperclip-deterministic",
     "driverVersion": "1.0.0"
diff --git a/packages/paperclip-runner/protocol/manifest.json b/packages/paperclip-runner/protocol/manifest.json
index fc4661a127a..9c6ed049813 100644
--- a/packages/paperclip-runner/protocol/manifest.json
+++ b/packages/paperclip-runner/protocol/manifest.json
@@ -160,7 +160,7 @@
     },
     {
       "path": "fixtures/evals/native-execution-seeded.json",
-      "sha256": "8a86a398f09ed822e7fd9acbbcd08a007921562ad21df4306bb47c45e32d0b60",
+      "sha256": "142abbf9009e5d48a1bc91287af1dc15866c34439d587dee9d06eb31ce77d07c",
       "expectation": "accept",
       "compatibilityCase": "canonical"
     },
diff --git a/packages/paperclip-runner/spec/capability/protocol-coverage.json b/packages/paperclip-runner/spec/capability/protocol-coverage.json
index b3de1393ab4..7fd0fff92c9 100644
--- a/packages/paperclip-runner/spec/capability/protocol-coverage.json
+++ b/packages/paperclip-runner/spec/capability/protocol-coverage.json
@@ -7,7 +7,7 @@
     "src/scenarios/scenario-plan.ts"
   ],
   "counts": {
-    "actions": 46,
+    "actions": 47,
     "legacyRequirements": 106
   },
   "actions": [
@@ -1426,6 +1426,26 @@
         "src/scenarios/scenario-explorer.test.ts::renders every scenario with exposure, control plane, authorization, diff, and parity"
       ]
     },
+    {
+      "id": "reassign_task",
+      "ownership": "optional_agent_tool",
+      "surfaces": [
+        "scenario",
+        "live"
+      ],
+      "legacyAliases": [],
+      "contractCase": "protocol-action:reassign_task",
+      "contractOwner": "src/catalog/protocol-action-contracts.test.ts::reassign_task has a schema-valid canonical example and every declared projection",
+      "legacyBehavioralCases": [],
+      "deterministicCases": [
+        "protocol-action:reassign_task"
+      ],
+      "legacyRequirementCases": [],
+      "deterministicOwners": [
+        "src/catalog/protocol-action-contracts.test.ts::reassign_task has a schema-valid canonical example and every declared projection",
+        "src/scenarios/scenario-explorer.test.ts::renders every scenario with exposure, control plane, authorization, diff, and parity"
+      ]
+    },
     {
       "id": "sync_company_skills",
       "ownership": "optional_agent_tool",
diff --git a/packages/paperclip-runner/spec/operation-groups/source.json b/packages/paperclip-runner/spec/operation-groups/source.json
index f5aa9d84aea..ea704ff57c7 100644
--- a/packages/paperclip-runner/spec/operation-groups/source.json
+++ b/packages/paperclip-runner/spec/operation-groups/source.json
@@ -57,8 +57,8 @@
     },
     {
       "id": "delegation_dependencies",
-      "description": "Create delegated work and maintain dependency edges.",
-      "operationIds": ["create_task", "set_dependencies"]
+      "description": "Create or reassign delegated work and maintain dependency edges.",
+      "operationIds": ["create_task", "reassign_task", "set_dependencies"]
     },
     {
       "id": "governance",
@@ -180,9 +180,9 @@
       "legacyGroup": 6,
       "name": "Subtasks",
       "owner": "optional delegation tools",
-      "operationIds": ["create_task"],
+      "operationIds": ["create_task", "reassign_task"],
       "controlPlaneOperationIds": ["route_wake"],
-      "realSurface": "company issue create, child issue, assignment, and wake services",
+      "realSurface": "company issue create, child issue, guarded reassignment, and wake services",
       "mockStateDomains": ["company", "task", "actor", "blockers", "wake", "audit"],
       "prpEvidence": "company/task state diff, audit reference, and continuation wake evidence",
       "gap": "create_task is production-bound to ordinary active-issue child creation with assignment, dependency-ready wake, company checks, child limits, and durable source-scoped idempotency."
diff --git a/packages/paperclip-runner/spec/paperclip-agent-operation-groups.md b/packages/paperclip-runner/spec/paperclip-agent-operation-groups.md
index 8e0670ab172..6e4a560953a 100644
--- a/packages/paperclip-runner/spec/paperclip-agent-operation-groups.md
+++ b/packages/paperclip-runner/spec/paperclip-agent-operation-groups.md
@@ -6,7 +6,7 @@ Status: canonical explanatory contract for the Paperclip runner V1 surface.
 
 This document keeps three independent meanings of **group** separate. PRP families describe wire evidence and controller commands; capability placement decides who owns an operation; behavioral eval groups organize the 106 scenario corpus. None of the three axes can be used as a substitute for another.
 
-The generated totals are **105 PRP events in 31 event families**, **18 controller commands in 7 command families**, **10 control-plane operations**, **46 reconciled semantic operations** (14 always, 32 optional), and **106 scenarios in 16 behavior groups**.
+The generated totals are **105 PRP events in 31 event families**, **18 controller commands in 7 command families**, **10 control-plane operations**, **47 reconciled semantic operations** (14 always, 33 optional), and **106 scenarios in 16 behavior groups**.
 
 ## Axis 1: PRP v1 event and command families
 
@@ -87,7 +87,7 @@ Placement has exactly three outcomes:
 
 `answer_status_question`, `block_task`, `finish_task`, `get_task_context`, `get_task_history`, `inspect_operation_result`, `list_document_revisions`, `list_documents`, `read_document`, `register_deliverable`, `report_progress`, `request_human_input`, `request_review`, `write_document`.
 
-### Optional operations (32) and grant groups (13)
+### Optional operations (33) and grant groups (13)
 
 Grant groups are documentation/exposure bundles, not additional authority. The operation descriptor's exact `requiredClaims` remains decisive.
 
@@ -95,7 +95,7 @@ Grant groups are documentation/exposure bundles, not additional authority. The o
 | --- | --- | --- | --- |
 | `discovery` | `search_tasks`<br>`list_agents`<br>`get_agent`<br>`list_projects`<br>`list_goals` | `discovery:agents:read`<br>`discovery:goals:read`<br>`discovery:projects:read`<br>`discovery:tasks:read` | Company-visible task, agent, project, and goal discovery. |
 | `projects` | `create_project`<br>`list_project_repositories` | none | Project creation and authorized repository discovery through the live company/run authority. |
-| `delegation_dependencies` | `create_task`<br>`set_dependencies` | `delegation:tasks:create`<br>`dependencies:write` | Create delegated work and maintain dependency edges. |
+| `delegation_dependencies` | `create_task`<br>`reassign_task`<br>`set_dependencies` | `delegation:tasks:assign`<br>`delegation:tasks:create`<br>`dependencies:write` | Create or reassign delegated work and maintain dependency edges. |
 | `governance` | `list_approvals`<br>`get_approval`<br>`get_approval_context`<br>`request_approval`<br>`decide_approval`<br>`comment_on_approval` | `governance:approvals:comment`<br>`governance:approvals:decide`<br>`governance:approvals:read`<br>`governance:approvals:request` | Read, request, comment on, and decide approvals under governed-action checks. |
 | `cases` | `list_cases`<br>`upsert_case` | `cases:read`<br>`cases:write` | Read and update case summaries without reusing issue-document authority. |
 | `workspace_runtime` | `get_workspace_runtime`<br>`control_workspace_service` | `workspace:control`<br>`workspace:read` | Inspect and control the active issue workspace runtime. |
@@ -147,6 +147,7 @@ Grant groups are documentation/exposure bundles, not additional authority. The o
 | `manage_routine` | `optional_agent_tool` | `routines:write` | `standard`<br>`skill_test` | `admin` | `required` | no | `mock_extension:routines.manage` | `scenario`<br>`scenario_mock` | `unbound`<br>company admin/portability item event plus audit record<br>catalog PRP status: `audit_pending` |
 | `read_document` | `always_agent_tool` | none | `standard`<br>`ask`<br>`planning`<br>`skill_test` | `read` | `none` | no | `snapshot_read:active_task_document` | `scenario` + `live`<br>`live_codex` | `unbound`<br>read projection surfaced via a tool-result item event; no control-plane state diff<br>catalog PRP status: `audit_pending` |
 | `read_secret_value` | `optional_agent_tool` | `secrets:values:read` | `standard`<br>`skill_test` | `secret_read` | `none` | yes | `mock_extension:secrets.value` | `scenario`<br>`scenario_mock` | `unbound`<br>redacted tool-result item event; secret value never reaches the wire<br>catalog PRP status: `audit_pending` |
+| `reassign_task` | `optional_agent_tool` | `delegation:tasks:assign` | `standard`<br>`skill_test` | `company_write` | `required` | no | `semantic_command:reassign_task` | `scenario` + `live`<br>`live_codex` | `PaperclipRunnerToolAuthority.reassign_task`<br>semantic-operation item event plus company-entity state diff and audit record<br>catalog PRP status: `bound` |
 | `register_deliverable` | `always_agent_tool` | none | `standard`<br>`planning`<br>`skill_test` | `task_write` | `required` | no | `semantic_command:register_deliverable` | `scenario` + `live`<br>`live_codex` | `unbound`<br>semantic-operation item event plus active-task state diff, work-assessment, and issue-status-decision events<br>catalog PRP status: `audit_pending` |
 | `report_progress` | `always_agent_tool` | none | `standard`<br>`ask`<br>`planning`<br>`skill_test` | `task_write` | `required` | no | `semantic_command:report_progress` | `scenario` + `live`<br>`live_codex` | `unbound`<br>semantic-operation item event plus active-task state diff, work-assessment, and issue-status-decision events<br>catalog PRP status: `audit_pending` |
 | `request_approval` | `optional_agent_tool` | `governance:approvals:request` | `standard`<br>`skill_test` | `governance` | `required` | no | `semantic_command:request_approval` | `scenario` + `live`<br>`live_codex` | `unbound`<br>approval lifecycle plus governed-wait continuation and audit events<br>catalog PRP status: `audit_pending` |
@@ -173,7 +174,7 @@ Behavior groups describe expected outcomes and trajectories. They do not grant t
 | [`st` — Status](#behavior-group-st-status) | always tools + control-plane arbitration | `answer_status_question`<br>`finish_task`<br>`block_task`<br>`request_review` | `reconcile_run`<br>`append_audit_record` | issue PATCH, review/liveness policy, and native finalization arbitration | `task`<br>`comments`<br>`interactions`<br>`blockers`<br>`audit`<br>`run` | 8 | semantic operation receipt, work assessment, issue-status decision, and terminal causality | Production semantic binding and additive typed operation/conflict receipts remain unimplemented. |
 | [`cm` — Comments](#behavior-group-cm-comments) | always tools | `get_task_history`<br>`report_progress` | `append_audit_record` | issue comment list/get/create routes | `task`<br>`comments`<br>`actor`<br>`idempotency`<br>`audit` | 6 | bounded read result or idempotent comment-write receipt plus audit reference | Active-task binding is unbound; cross-task comment mutation is deliberately outside V1. |
 | [`se` — Search](#behavior-group-se-search) | optional discovery tools | `search_tasks`<br>`list_agents`<br>`get_agent`<br>`list_projects`<br>`list_goals`<br>`list_project_repositories` | none | company issue search and agent/project/goal list/get routes | `company`<br>`task`<br>`actor`<br>`project`<br>`goal` | 4 | bounded redacted read projections through tool-result item events | Goal operations remain scenario-only. Project and repository discovery contracts are delivered by the live server authority; they are not implemented by the mock command dispatcher. |
-| [`su` — Subtasks](#behavior-group-su-subtasks) | optional delegation tools | `create_task` | `route_wake` | company issue create, child issue, assignment, and wake services | `company`<br>`task`<br>`actor`<br>`blockers`<br>`wake`<br>`audit` | 4 | company/task state diff, audit reference, and continuation wake evidence | create_task is production-bound to ordinary active-issue child creation with assignment, dependency-ready wake, company checks, child limits, and durable source-scoped idempotency. |
+| [`su` — Subtasks](#behavior-group-su-subtasks) | optional delegation tools | `create_task`<br>`reassign_task` | `route_wake` | company issue create, child issue, guarded reassignment, and wake services | `company`<br>`task`<br>`actor`<br>`blockers`<br>`wake`<br>`audit` | 4 | company/task state diff, audit reference, and continuation wake evidence | create_task is production-bound to ordinary active-issue child creation with assignment, dependency-ready wake, company checks, child limits, and durable source-scoped idempotency. |
 | [`bl` — Blockers](#behavior-group-bl-blockers) | always/optional tools + control plane | `block_task`<br>`set_dependencies` | `schedule_blocker_wake`<br>`route_wake` | issue relations, blocker projection, liveness validation, and blocker wake services | `task`<br>`blockers`<br>`wake`<br>`actor`<br>`audit`<br>`fault` | 5 | dependency diff, block receipt, attention routing, and issue-status decision | set_dependencies is production-bound for the active issue; block_task remains unbound, and cancelled-blocker receipts still need typed additive evidence. |
 | [`dp` — Documents and plans](#behavior-group-dp-documents-and-plans) | always tools; restore optional; destructive lifecycle control-plane-only | `list_documents`<br>`read_document`<br>`list_document_revisions`<br>`write_document` | `append_audit_record` | issue document list/read/upsert/revision/restore/lock/unlock/delete routes | `task`<br>`documents`<br>`interactions`<br>`idempotency`<br>`audit`<br>`fault` | 3 | bounded reads and revision-safe write/conflict/denial receipts with revision lineage | restore_document_revision is an approved optional-tool gap; lock/unlock/delete are intentionally control-plane-only. |
 | [`ix` — Interactions](#behavior-group-ix-interactions) | always tools + addressed resolver | `request_human_input` | `route_wake` | issue-thread interaction create/respond/accept/reject/withdraw services | `task`<br>`documents`<br>`interactions`<br>`wake`<br>`actor`<br>`idempotency` | 9 | interaction proposal/materialization/response/delivery and attention events | Production binding and semantic resolution receipts are unbound. |
@@ -456,9 +457,9 @@ Current responsibility-based paths are normative. Numbered `phase-*` or mileston
 
 ### Catalog split and deliberate replacement
 
-- Scenario/eval catalog: **38** operations.
-- Live dispatcher catalog: **34** operations.
-- Shared: **26**; union/canonical authority: **46**.
+- Scenario/eval catalog: **39** operations.
+- Live dispatcher catalog: **35** operations.
+- Shared: **27**; union/canonical authority: **47**.
 - Scenario-only: `administer_company`, `export_company`, `inspect_operation_result`, `list_cases`, `list_company_skills`, `list_goals`, `list_routines`, `list_secret_metadata`, `manage_routine`, `read_secret_value`, `sync_company_skills`, `upsert_case`.
 - Live-only: `call_api`, `create_project`, `get_agent`, `get_approval`, `get_approval_context`, `list_project_repositories`, `schedule_wake`, `search_api`.
 - The generated provider contract contains exactly the live catalog; the canonical union remains the migration authority until all scenario-only operations are either implemented, deferred, or removed by an explicit reconciliation decision.
diff --git a/packages/paperclip-runner/src/catalog/catalog-docs.test.ts b/packages/paperclip-runner/src/catalog/catalog-docs.test.ts
index 56f2e1a0415..055503d1b7a 100644
--- a/packages/paperclip-runner/src/catalog/catalog-docs.test.ts
+++ b/packages/paperclip-runner/src/catalog/catalog-docs.test.ts
@@ -43,7 +43,7 @@ describe("capability-semantic-tools.md stays in sync with the catalog", () => {
     expect(Number(alwaysHeader)).toBe(always.length);
     expect(Number(optionalHeader)).toBe(optional.length);
     // Guard against the historical 36-vs-37 drift the reconciliation plan flagged.
-    expect(SCENARIO_CATALOG.length).toBe(38);
+    expect(SCENARIO_CATALOG.length).toBe(39);
   });
 
   it("lists exactly the catalog's operation ids in the counts region", () => {
diff --git a/packages/paperclip-runner/src/catalog/reconciliation.test.ts b/packages/paperclip-runner/src/catalog/reconciliation.test.ts
index 12f46328e08..b339834422a 100644
--- a/packages/paperclip-runner/src/catalog/reconciliation.test.ts
+++ b/packages/paperclip-runner/src/catalog/reconciliation.test.ts
@@ -19,10 +19,10 @@ const packageRoot = resolve(dirname(fileURLToPath(import.meta.url)), "..", "..")
 describe("canonical semantic-catalog reconciliation authority", () => {
   it("pins the reconciled op-set relationship between the two catalogs", () => {
     const summary = capabilityCatalogReconciliation();
-    expect(summary.scenarioCount).toBe(38);
-    expect(summary.liveCount).toBe(34);
-    expect(summary.sharedCount).toBe(26);
-    expect(summary.unionCount).toBe(46);
+    expect(summary.scenarioCount).toBe(39);
+    expect(summary.liveCount).toBe(35);
+    expect(summary.sharedCount).toBe(27);
+    expect(summary.unionCount).toBe(47);
     // Any operation added to or removed from either catalog without a
     // reconciliation decision changes these exact sets and fails the gate.
     expect(summary.liveOnly).toEqual([
@@ -52,7 +52,7 @@ describe("canonical semantic-catalog reconciliation authority", () => {
   });
 
   it("is the single source both catalogs derive their operation set from", () => {
-    expect(CAPABILITY_CANONICAL_OPERATIONS).toHaveLength(46);
+    expect(CAPABILITY_CANONICAL_OPERATIONS).toHaveLength(47);
     const canonicalIds = new Set(CAPABILITY_CANONICAL_OPERATIONS.map((operation) => operation.operationId));
     // Neither catalog may contain an operation absent from the canonical source.
     for (const tool of SCENARIO_CATALOG) expect(canonicalIds.has(tool.operationId)).toBe(true);
@@ -86,7 +86,7 @@ describe("canonical semantic-catalog reconciliation authority", () => {
   });
 
   it("names placement, claims, task modes, side-effect class, idempotency, redaction, mock mapping, real binding status, and PRP evidence for every operation", () => {
-    expect(CAPABILITY_CANONICAL_CATALOG).toHaveLength(46);
+    expect(CAPABILITY_CANONICAL_CATALOG).toHaveLength(47);
     for (const operation of CAPABILITY_CANONICAL_CATALOG) {
       expect(operation.placement).toMatch(/^(always|optional)_agent_tool$/);
       expect(Array.isArray(operation.requiredClaims)).toBe(true);
@@ -112,7 +112,7 @@ describe("canonical semantic-catalog reconciliation authority", () => {
   it("classifies real binding status so generic_api_request is never product coverage", () => {
     const summary = capabilityCatalogReconciliation();
     expect(summary.byRealBindingStatus).toEqual({
-      live_codex: 33,
+      live_codex: 34,
       scenario_mock: 12,
       test_only: 1,
     });
diff --git a/packages/paperclip-runner/src/catalog/semantic-action-catalog.test.ts b/packages/paperclip-runner/src/catalog/semantic-action-catalog.test.ts
index 40831bc0e85..f50e99e98e2 100644
--- a/packages/paperclip-runner/src/catalog/semantic-action-catalog.test.ts
+++ b/packages/paperclip-runner/src/catalog/semantic-action-catalog.test.ts
@@ -69,7 +69,7 @@ describe("semantic action catalog", () => {
       (action) => action.operationId,
     );
 
-    expect(operationIds).toHaveLength(33);
+    expect(operationIds).toHaveLength(34);
     expect(new Set(operationIds).size).toBe(operationIds.length);
     expect(operationIds).not.toContain("generic_api_request");
     expect(Object.isFrozen(PAPERCLIP_SEMANTIC_ACTION_CATALOG)).toBe(true);
diff --git a/packages/paperclip-runner/src/catalog/semantic-action-catalog.ts b/packages/paperclip-runner/src/catalog/semantic-action-catalog.ts
index eeeb4e8842b..7f37c8d4427 100644
--- a/packages/paperclip-runner/src/catalog/semantic-action-catalog.ts
+++ b/packages/paperclip-runner/src/catalog/semantic-action-catalog.ts
@@ -1,3 +1,4 @@
+import { reassignTaskAction } from "../protocol-actions/reassign-task.js";
 import type {
   PaperclipJsonSchema,
   PaperclipSemanticActionDescriptor,
@@ -414,6 +415,9 @@ const descriptors: readonly PaperclipSemanticActionDescriptor[] = [
     ),
     outputSchema: operationReceipt,
   }),
+  descriptor({
+    ...reassignTaskAction.live.descriptor, placement: "optional", effect: "write",
+  }),
   descriptor({
     operationId: "set_dependencies",
     title: "Set task dependencies",
diff --git a/packages/paperclip-runner/src/catalog/semantic-action-types.ts b/packages/paperclip-runner/src/catalog/semantic-action-types.ts
index 7be978cb978..1dbf220cc81 100644
--- a/packages/paperclip-runner/src/catalog/semantic-action-types.ts
+++ b/packages/paperclip-runner/src/catalog/semantic-action-types.ts
@@ -22,6 +22,7 @@ export type PaperclipSemanticActionId =
   | "get_approval_context"
   | "get_workspace_runtime"
   | "control_workspace_service"
+  | "reassign_task"
   | "set_dependencies"
   | "create_skill"
   | "create_project"
diff --git a/packages/paperclip-runner/src/issue-thread/live-projection.ts b/packages/paperclip-runner/src/issue-thread/live-projection.ts
index a091295162d..06f5ceab78e 100644
--- a/packages/paperclip-runner/src/issue-thread/live-projection.ts
+++ b/packages/paperclip-runner/src/issue-thread/live-projection.ts
@@ -487,7 +487,7 @@ function derivedRecordItems(
     }
   }
 
-  if (operationId === "create_task" || operationId === "set_dependencies") {
+  if (operationId === "create_task" || operationId === "reassign_task" || operationId === "set_dependencies") {
     const created = refsOf("task")
       .filter((id) => id !== state.tasks[0]?.id)
       .map((ref) => state.tasks.find((candidate) => candidate.id === ref))
diff --git a/packages/paperclip-runner/src/mock-core/capability-control-plane-types.ts b/packages/paperclip-runner/src/mock-core/capability-control-plane-types.ts
index 0fed1d27637..ea53c55b0c3 100644
--- a/packages/paperclip-runner/src/mock-core/capability-control-plane-types.ts
+++ b/packages/paperclip-runner/src/mock-core/capability-control-plane-types.ts
@@ -40,6 +40,7 @@ export interface CapabilityFixtureActor {
 }
 
 export interface CapabilityFixtureTask {
+  statusVersion?: number;
   id: string;
   companyId: string;
   identifier: string;
@@ -391,6 +392,7 @@ export type CapabilitySemanticCommand =
       contentRef: string;
       title: string;
     })
+  | (CapabilityBaseCommand & { kind: "reassign_task"; targetTaskId: string; assigneeActorId: string; expectedAssigneeActorId: string | null; expectedStatusVersion: number; reason: string })
   | (CapabilityBaseCommand & { kind: "set_dependencies"; blockedByTaskIds: string[] })
   | (CapabilityBaseCommand & {
       kind: "create_task";
@@ -482,6 +484,7 @@ export const CAPABILITY_COMMAND_REQUIRED_CLAIMS = {
   resolve_human_input: ["control_plane:interactions"],
   register_deliverable: [],
   set_dependencies: ["dependencies:write"],
+  reassign_task: ["delegation:tasks:assign"],
   create_task: ["delegation:tasks:create"],
   request_approval: ["governance:approvals:request"],
   decide_approval: ["governance:approvals:decide"],
@@ -601,7 +604,7 @@ export function createCapabilityFixtureState(seed: CapabilityFixtureSeed = {}):
     activeRunId: null,
     company,
     actors: structuredClone(actors),
-    tasks: structuredClone(tasks),
+    tasks: structuredClone(tasks).map(task => ({ ...task, statusVersion: task.statusVersion ?? 0 })),
     outOfScopeTaskIds: structuredClone(seed.outOfScopeTaskIds ?? []),
     comments: structuredClone(seed.comments ?? []),
     documents: structuredClone(seed.documents ?? []),
diff --git a/packages/paperclip-runner/src/mock-core/capability-mock-control-plane-adapter.ts b/packages/paperclip-runner/src/mock-core/capability-mock-control-plane-adapter.ts
index 9801d5380be..984fdd11345 100644
--- a/packages/paperclip-runner/src/mock-core/capability-mock-control-plane-adapter.ts
+++ b/packages/paperclip-runner/src/mock-core/capability-mock-control-plane-adapter.ts
@@ -891,6 +891,32 @@ export class CapabilityMockControlPlaneAdapter implements CapabilityMockControlP
         entityRefs.push(`artifact:${artifact.id}`, `work-product:${workProduct.id}`);
         break;
       }
+      case "reassign_task": {
+        const target = this.#task(command.targetTaskId);
+        const assignee = this.#actor(command.assigneeActorId);
+        this.#assertCompany(run.companyId, target.companyId, assignee.companyId);
+        if (target.id === task.id) throw new CapabilityMockControlPlaneError("reassignment_current_task", "Delegate with create_task instead of reassigning the caller");
+        if (["done", "cancelled", "in_review"].includes(target.status)) throw new CapabilityMockControlPlaneError("reassignment_state_denied", "Task cannot be reassigned in this state");
+        if (assignee.status !== "active") throw new CapabilityMockControlPlaneError("reassignment_target_unavailable", "Assignee must be active");
+        if (target.assigneeActorId !== command.expectedAssigneeActorId || (target.statusVersion ?? 0) !== command.expectedStatusVersion) {
+          throw new CapabilityMockControlPlaneError("reassignment_conflict", "Refresh the task before deciding again");
+        }
+        requireText(command.reason, "reassignment reason");
+        entityRefs.push(`task:${target.id}`);
+        if (target.assigneeActorId === assignee.id) break;
+        if (target.executionRunId) {
+          const previous = this.#state.runs.find(candidate => candidate.id === target.executionRunId);
+          if (previous) previous.status = "cancelled";
+        }
+        target.assigneeActorId = assignee.id;
+        target.statusVersion = (target.statusVersion ?? 0) + 1;
+        target.checkoutRunId = null;
+        target.executionRunId = null;
+        if (target.status === "in_progress") target.status = "todo";
+        this.#appendComment(target.id, run.actorId, command.reason);
+        if (target.status === "todo") scheduledWakeIds.push(this.#scheduleWake(assignee.id, target.id, "manual", { reason: command.reason }, 0));
+        break;
+      }
       case "set_dependencies": {
         this.#replaceDependencies(task, command.blockedByTaskIds);
         if (command.blockedByTaskIds.length > 0) {
diff --git a/packages/paperclip-runner/src/mock-core/task-reassignment.test.ts b/packages/paperclip-runner/src/mock-core/task-reassignment.test.ts
new file mode 100644
index 00000000000..1947e8b97f3
--- /dev/null
+++ b/packages/paperclip-runner/src/mock-core/task-reassignment.test.ts
@@ -0,0 +1,45 @@
+import { describe, expect, it } from "vitest";
+import { CapabilityMockControlPlaneAdapter } from "./capability-mock-control-plane-adapter.js";
+
+async function fixture(status: "todo" | "blocked" | "done" = "todo", claims = ["delegation:tasks:assign"]) {
+  const base = new CapabilityMockControlPlaneAdapter().snapshot();
+  const adapter = new CapabilityMockControlPlaneAdapter({
+    actors: [...base.actors, { ...base.actors[0]!, id: "recipient", name: "Recipient" }],
+    tasks: [...base.tasks, { ...base.tasks[0]!, id: "target", identifier: "MCK-2", title: "Existing work", status, statusVersion: 0 }],
+  });
+  await adapter.start();
+  await adapter.openFixtureRun({ identity: { runId: "run-1", sessionId: "session-1", companyId: base.company.id, issueId: base.tasks[0]!.id, agentId: base.actors[0]!.id }, backendKind: "mock", sourceInstanceId: "reassignment-test", capabilities: claims });
+  const call = { runId: "run-1", idempotencyKey: "handoff", command: { kind: "reassign_task" as const, targetTaskId: "target", assigneeActorId: "recipient", expectedAssigneeActorId: base.actors[0]!.id, expectedStatusVersion: 0, reason: "Recipient owns implementation" } };
+  return { adapter, call, base };
+}
+
+describe("mock task reassignment conformance", () => {
+  it("changes one existing owner, schedules one wake, and deduplicates replay", async () => {
+    const { adapter, call } = await fixture();
+    const result = await adapter.applyCommand(call);
+    await adapter.applyCommand(call);
+    const state = adapter.snapshot();
+    expect(state.tasks).toHaveLength(2);
+    expect(state.tasks.find(task => task.id === "target")).toMatchObject({ assigneeActorId: "recipient", statusVersion: 1, status: "todo" });
+    expect(state.wakes).toHaveLength(1);
+    expect(result.scheduledWakeIds).toEqual([state.wakes[0]!.id]);
+    expect(state.comments.filter(comment => comment.taskId === "target")).toHaveLength(1);
+  });
+  it("preserves blocked state without a wake", async () => {
+    const { adapter, call } = await fixture("blocked");
+    await adapter.applyCommand(call);
+    expect(adapter.snapshot().tasks.find(task => task.id === "target")).toMatchObject({ status: "blocked", assigneeActorId: "recipient" });
+    expect(adapter.snapshot().wakes).toHaveLength(0);
+  });
+  it.each(["claim", "owner", "version", "self", "terminal", "key-conflict"])("rejects %s without a second ownership effect", async kind => {
+    const { adapter, call, base } = await fixture(kind === "terminal" ? "done" : "todo", kind === "claim" ? [] : undefined);
+    if (kind === "owner") call.command.expectedAssigneeActorId = "someone-else";
+    if (kind === "version") call.command.expectedStatusVersion = 99;
+    if (kind === "self") call.command.targetTaskId = base.tasks[0]!.id;
+    if (kind === "key-conflict") { await adapter.applyCommand(call); call.command.reason = "Conflicting request"; }
+    const before = adapter.snapshot();
+    await expect(adapter.applyCommand(call)).rejects.toThrow();
+    expect(adapter.snapshot().tasks).toEqual(before.tasks);
+    expect(adapter.snapshot().wakes).toEqual(before.wakes);
+  });
+});
diff --git a/packages/paperclip-runner/src/protocol-actions/index.ts b/packages/paperclip-runner/src/protocol-actions/index.ts
index c71dc4a1fda..c762faae9c9 100644
--- a/packages/paperclip-runner/src/protocol-actions/index.ts
+++ b/packages/paperclip-runner/src/protocol-actions/index.ts
@@ -1,3 +1,4 @@
+import { reassignTaskAction } from "./reassign-task.js";
 import { createSkillAction } from "./create-skill.js";
 import { createProjectAction } from "./create-project.js";
 import { listProjectRepositoriesAction } from "./list-project-repositories.js";
@@ -90,6 +91,7 @@ export const PAPERCLIP_PROTOCOL_ACTIONS = deepFreezeProtocolAction([
   scheduleWakeAction,
   searchTasksAction,
   setDependenciesAction,
+  reassignTaskAction,
   syncCompanySkillsAction,
   upsertCaseAction,
   writeDocumentAction,
diff --git a/packages/paperclip-runner/src/protocol-actions/reassign-task.ts b/packages/paperclip-runner/src/protocol-actions/reassign-task.ts
new file mode 100644
index 00000000000..417e4fa44a7
--- /dev/null
+++ b/packages/paperclip-runner/src/protocol-actions/reassign-task.ts
@@ -0,0 +1,287 @@
+/** Canonical definition and documentation for `reassign_task`. */
+export const reassignTaskAction = {
+  "id": "reassign_task",
+  "canonical": {
+    "operationId": "reassign_task",
+    "surfaces": [
+      "scenario",
+      "live"
+    ],
+    "placement": "optional_agent_tool",
+    "optionalGroup": "delegation_dependencies",
+    "requiredClaims": [
+      "delegation:tasks:assign"
+    ],
+    "taskModes": [
+      "standard",
+      "skill_test"
+    ],
+    "sideEffectClass": "company_write",
+    "idempotency": "required",
+    "disabledByDefault": false,
+    "realBindingStatus": "live_codex",
+    "realServiceBinding": "PaperclipRunnerToolAuthority.reassign_task",
+    "prpEvidence": "semantic-operation item event plus company-entity state diff and audit record",
+    "prpBindingStatus": "bound",
+    "legacyAliases": []
+  },
+  "documentation": {
+    "title": "Reassign task",
+    "description": "Reassign an existing task to another company agent. Read search_tasks first and supply its current assignee and statusVersion to prevent overwriting a concurrent change. Preserve the task, documents, dependencies, and blocked/backlog status. Active work is stopped before handoff. Use a stable idempotency key for retries. Cannot reassign this run\u2019s own task, conversations, completed tasks, or pending reviews; use create_task for delegation from the current task.",
+    "note": null
+  },
+  "examples": {
+    "call": {
+      "operationId": "reassign_task",
+      "input": {
+        "idempotencyKey": "reassign-example",
+        "taskId": "task-delegated",
+        "assigneeActorId": "actor-manager",
+        "expectedAssigneeActorId": "actor-engineer",
+        "expectedStatusVersion": 0,
+        "reason": "The manager owns the next step."
+      }
+    },
+    "scenarioCall": {
+      "operationId": "reassign_task",
+      "idempotencyKey": "reassign-example",
+      "input": {
+        "taskId": "task-delegated",
+        "assigneeActorId": "actor-manager",
+        "expectedAssigneeActorId": "actor-engineer",
+        "expectedStatusVersion": 0,
+        "reason": "The manager owns the next step."
+      }
+    },
+    "success": {
+      "ok": true,
+      "operationId": "reassign_task",
+      "result": {
+        "commandId": "reassign-example",
+        "disposition": "applied",
+        "stateRevision": 1,
+        "entityRefs": [
+          "task-delegated"
+        ],
+        "scheduledWakeIds": [
+          "wake-example"
+        ]
+      }
+    }
+  },
+  "live": {
+    "order": 46,
+    "descriptor": {
+      "schema": "paperclip.semantic-tool.v1",
+      "operationId": "reassign_task",
+      "version": 1,
+      "title": "Reassign task",
+      "description": "Reassign an existing task to another company agent. Read search_tasks first and supply its current assignee and statusVersion to prevent overwriting a concurrent change. Preserve the task, documents, dependencies, and blocked/backlog status. Active work is stopped before handoff. Use a stable idempotency key for retries. Cannot reassign this run\u2019s own task, conversations, completed tasks, or pending reviews; use create_task for delegation from the current task.",
+      "exposure": "optional",
+      "requiredClaims": [
+        "delegation:tasks:assign"
+      ],
+      "allowedModes": [
+        "standard",
+        "skill_test"
+      ],
+      "inputSchema": {
+        "type": "object",
+        "properties": {
+          "idempotencyKey": {
+            "type": "string",
+            "minLength": 1,
+            "maxLength": 240,
+            "description": "Caller-stable retry key."
+          },
+          "taskId": {
+            "type": "string",
+            "minLength": 1,
+            "description": "Existing task ID from search_tasks."
+          },
+          "assigneeActorId": {
+            "type": "string",
+            "minLength": 1,
+            "description": "New company agent ID from list_agents."
+          },
+          "expectedAssigneeActorId": {
+            "type": [
+              "string",
+              "null"
+            ],
+            "description": "Current assigneeAgentId from search_tasks; null means unassigned."
+          },
+          "expectedStatusVersion": {
+            "type": "integer",
+            "minimum": 0,
+            "description": "Current statusVersion from search_tasks."
+          },
+          "reason": {
+            "type": "string",
+            "minLength": 1,
+            "maxLength": 20000,
+            "description": "Why the task should move and context for the new owner."
+          }
+        },
+        "required": [
+          "idempotencyKey",
+          "taskId",
+          "assigneeActorId",
+          "expectedAssigneeActorId",
+          "expectedStatusVersion",
+          "reason"
+        ],
+        "additionalProperties": false
+      },
+      "outputSchema": {
+        "type": "object",
+        "properties": {
+          "commandId": {
+            "type": "string",
+            "description": "Stable command identifier.",
+            "minLength": 1,
+            "maxLength": 200
+          },
+          "disposition": {
+            "enum": [
+              "applied",
+              "duplicate"
+            ]
+          },
+          "stateRevision": {
+            "type": "integer",
+            "minimum": 0
+          },
+          "entityRefs": {
+            "type": "array",
+            "description": "Entities affected by the operation.",
+            "items": {
+              "type": "string",
+              "minLength": 1
+            },
+            "maxItems": 200,
+            "uniqueItems": true
+          },
+          "scheduledWakeIds": {
+            "type": "array",
+            "description": "Wake identifiers scheduled by the operation.",
+            "items": {
+              "type": "string",
+              "minLength": 1
+            },
+            "maxItems": 200,
+            "uniqueItems": true
+          }
+        },
+        "required": [
+          "commandId",
+          "disposition",
+          "stateRevision",
+          "entityRefs",
+          "scheduledWakeIds"
+        ],
+        "additionalProperties": false
+      }
+    }
+  },
+  "scenario": {
+    "order": 40,
+    "descriptor": {
+      "operationId": "reassign_task",
+      "version": 1,
+      "title": "Reassign task",
+      "description": "Reassign an existing task to another company agent. Read search_tasks first and supply its current assignee and statusVersion to prevent overwriting a concurrent change. Preserve the task, documents, dependencies, and blocked/backlog status. Active work is stopped before handoff. Use a stable idempotency key for retries. Cannot reassign this run\u2019s own task, conversations, completed tasks, or pending reviews; use create_task for delegation from the current task.",
+      "inputSchema": {
+        "type": "object",
+        "properties": {
+          "taskId": {
+            "type": "string",
+            "minLength": 1,
+            "description": "Existing task ID from search_tasks."
+          },
+          "assigneeActorId": {
+            "type": "string",
+            "minLength": 1,
+            "description": "New company agent ID from list_agents."
+          },
+          "expectedAssigneeActorId": {
+            "type": [
+              "string",
+              "null"
+            ],
+            "description": "Current assigneeAgentId from search_tasks; null means unassigned."
+          },
+          "expectedStatusVersion": {
+            "type": "integer",
+            "minimum": 0,
+            "description": "Current statusVersion from search_tasks."
+          },
+          "reason": {
+            "type": "string",
+            "minLength": 1,
+            "maxLength": 20000,
+            "description": "Why the task should move and context for the new owner."
+          }
+        },
+        "required": [
+          "taskId",
+          "assigneeActorId",
+          "expectedAssigneeActorId",
+          "expectedStatusVersion",
+          "reason"
+        ],
+        "additionalProperties": false
+      },
+      "outputSchema": {
+        "type": "object",
+        "properties": {
+          "schema": {
+            "type": "string",
+            "enum": [
+              "paperclip.capability.tool-result.v1"
+            ]
+          },
+          "ok": {
+            "type": "boolean"
+          },
+          "operationId": {
+            "const": "reassign_task"
+          },
+          "operationResultId": {
+            "type": "string",
+            "minLength": 1
+          },
+          "value": {},
+          "commandResult": {},
+          "authorization": {}
+        },
+        "required": [
+          "schema",
+          "ok",
+          "operationId",
+          "operationResultId",
+          "value",
+          "commandResult",
+          "authorization"
+        ],
+        "additionalProperties": false
+      },
+      "disposition": "optional_agent_tool",
+      "optionalGroup": "delegation_dependencies",
+      "requiredClaims": [
+        "delegation:tasks:assign"
+      ],
+      "taskModes": [
+        "standard",
+        "skill_test"
+      ],
+      "sideEffectClass": "company_write",
+      "idempotency": "required",
+      "redaction": [],
+      "mockCommandMapping": {
+        "kind": "semantic_command",
+        "commandKind": "reassign_task"
+      }
+    }
+  }
+} as const;
diff --git a/packages/paperclip-runner/src/semantic-tools/discovery.ts b/packages/paperclip-runner/src/semantic-tools/discovery.ts
index 28bbcad11b4..d1bf2bd4335 100644
--- a/packages/paperclip-runner/src/semantic-tools/discovery.ts
+++ b/packages/paperclip-runner/src/semantic-tools/discovery.ts
@@ -28,7 +28,7 @@ const NAMESPACE: Readonly<Record<CapabilitySemanticOperationId, string>> = Objec
   request_human_input: "documents", register_deliverable: "documents", finish_task: "active_task",
   block_task: "active_task", request_review: "active_task", search_tasks: "discovery",
   list_agents: "discovery", get_agent: "discovery", create_skill: "skills", create_task: "delegation", create_project: "projects", list_project_repositories: "projects", list_projects: "projects",
-  set_dependencies: "delegation", list_approvals: "governance", get_approval: "governance",
+  set_dependencies: "delegation", reassign_task: "delegation", list_approvals: "governance", get_approval: "governance",
   get_approval_context: "governance", request_approval: "governance",
   decide_approval: "governance", comment_on_approval: "governance",
   get_workspace_runtime: "workspace", control_workspace_service: "workspace",
diff --git a/packages/paperclip-runner/src/semantic-tools/dispatcher.ts b/packages/paperclip-runner/src/semantic-tools/dispatcher.ts
index 94068d72301..eeba423b6f9 100644
--- a/packages/paperclip-runner/src/semantic-tools/dispatcher.ts
+++ b/packages/paperclip-runner/src/semantic-tools/dispatcher.ts
@@ -267,7 +267,7 @@ export class CapabilitySemanticDispatcher {
           (query === undefined || `${task.identifier} ${task.title} ${task.description ?? ""}`.toLowerCase().includes(query)) &&
           (statuses.length === 0 || statuses.includes(task.status)),
         ).slice(0, limit);
-        return readSuccess(state.revision, { tasks });
+        return readSuccess(state.revision, { tasks: tasks.map(task => ({ ...task, statusVersion: task.statusVersion ?? 0 })) });
       }
       case "list_approvals":
         return readSuccess(state.revision, { approvals: state.approvals });
@@ -375,6 +375,9 @@ export class CapabilitySemanticDispatcher {
       case "request_review":
         command = { kind: "request_review", taskId, summary: requiredString(input.summary) };
         break;
+      case "reassign_task":
+        command = { kind: "reassign_task", taskId, targetTaskId: requiredString(input.taskId), assigneeActorId: requiredString(input.assigneeActorId), expectedAssigneeActorId: input.expectedAssigneeActorId === null ? null : requiredString(input.expectedAssigneeActorId), expectedStatusVersion: Number(input.expectedStatusVersion), reason: requiredString(input.reason) };
+        break;
       case "set_dependencies":
         command = { kind: "set_dependencies", taskId, blockedByTaskIds: optionalStringArray(input.blockedByTaskIds) };
         break;
diff --git a/packages/paperclip-runner/src/semantic-tools/paperclip-discovery.ts b/packages/paperclip-runner/src/semantic-tools/paperclip-discovery.ts
index 6f255660c68..bbc0c523025 100644
--- a/packages/paperclip-runner/src/semantic-tools/paperclip-discovery.ts
+++ b/packages/paperclip-runner/src/semantic-tools/paperclip-discovery.ts
@@ -35,7 +35,7 @@ const NAMESPACE: Readonly<Record<PaperclipSemanticActionId, string>> =
     get_approval_context: "governance",
     get_workspace_runtime: "workspace",
     control_workspace_service: "workspace",
-    set_dependencies: "delegation",
+    set_dependencies: "delegation", reassign_task: "delegation",
     create_skill: "skills", create_task: "delegation", create_project: "projects", list_project_repositories: "projects", list_projects: "projects",
     request_approval: "governance",
     decide_approval: "governance",
diff --git a/packages/paperclip-runner/src/semantic-tools/semantic-tools.test.ts b/packages/paperclip-runner/src/semantic-tools/semantic-tools.test.ts
index e02fcdccff1..da4afd4f882 100644
--- a/packages/paperclip-runner/src/semantic-tools/semantic-tools.test.ts
+++ b/packages/paperclip-runner/src/semantic-tools/semantic-tools.test.ts
@@ -94,7 +94,7 @@ describe("Capability semantic catalog and authorization", () => {
   it("publishes a stable narrow catalog without credentials or control-plane-owned tools", () => {
     const names = CAPABILITY_SEMANTIC_TOOL_CATALOG.map((tool) => tool.operationId);
     expect(new Set(names).size).toBe(names.length);
-    expect(names).toHaveLength(34);
+    expect(names).toHaveLength(35);
     expect(names).toContain("get_task_context");
     expect(names).toContain("finish_task");
     expect(names).not.toContain("checkout_task");
diff --git a/packages/paperclip-runner/src/semantic-tools/types.ts b/packages/paperclip-runner/src/semantic-tools/types.ts
index 68ac9449a87..ea9339edf8d 100644
--- a/packages/paperclip-runner/src/semantic-tools/types.ts
+++ b/packages/paperclip-runner/src/semantic-tools/types.ts
@@ -39,6 +39,7 @@ export type CapabilitySemanticOperationId =
   | "get_approval_context"
   | "get_workspace_runtime"
   | "control_workspace_service"
+  | "reassign_task"
   | "set_dependencies"
   | "create_skill"
   | "create_project"
diff --git a/packages/paperclip-runner/src/tools/capability-semantic-tool-runtime.ts b/packages/paperclip-runner/src/tools/capability-semantic-tool-runtime.ts
index fb1eab16bb7..060131c33f7 100644
--- a/packages/paperclip-runner/src/tools/capability-semantic-tool-runtime.ts
+++ b/packages/paperclip-runner/src/tools/capability-semantic-tool-runtime.ts
@@ -1583,6 +1583,8 @@ function commandForOperation(
         priority: typeof input.priority === "string" ? input.priority as never : undefined,
         blockedByTaskIds: optionalStringArray(input.blockedByTaskIds),
       };
+    case "reassign_task":
+      return { kind: "reassign_task", targetTaskId: requireString(input.taskId), assigneeActorId: requireString(input.assigneeActorId), expectedAssigneeActorId: input.expectedAssigneeActorId === null ? null : requireString(input.expectedAssigneeActorId), expectedStatusVersion: Number(input.expectedStatusVersion), reason: requireString(input.reason) };
     case "set_dependencies":
       return { kind: "set_dependencies", blockedByTaskIds: optionalStringArray(input.blockedByTaskIds) ?? [] };
     case "request_approval":
diff --git a/server/src/services/heartbeat.ts b/server/src/services/heartbeat.ts
index 6fc77e2423e..57db2850dcb 100644
--- a/server/src/services/heartbeat.ts
+++ b/server/src/services/heartbeat.ts
@@ -3649,6 +3649,7 @@ interface WakeupOptions {
   issueStateGuard?: {
     statuses: string[];
     assigneeAgentId: string;
+    statusVersion?: number;
   };
   /** Keep causally distinct external chat continuations out of an existing run. */
   allowRunCoalescing?: boolean;
@@ -24072,6 +24073,21 @@ export function heartbeatService(
                       runnerRemoteProviderPackPath:
                         runtimeEnv.PAPERCLIP_RUNNER_REMOTE_PROVIDER_PACK_PATH?.trim() ||
                         null,
+                      stopTaskForReassignment: async (target) => {
+                        await settleLiveRunnerGoalBeforeInterrupt(db, target);
+                        if (!target.runId) return;
+                        const prior = await getRun(target.runId);
+                        if (!prior || prior.companyId !== target.companyId || prior.agentId !== target.agentId) {
+                          throw conflict("Reassignment run binding changed");
+                        }
+                        const stopped = await cancelRunInternal(target.runId, "Cancelled for task reassignment", {
+                          errorCode: "issue_reassigned", suppressImmediateRecovery: true,
+                          resultJson: { reassignmentStopConfirmed: true },
+                        });
+                        if (stopped && ["running", "queued", "scheduled_retry"].includes(stopped.status)) {
+                          throw conflict("The previous run did not stop; reassignment was not applied");
+                        }
+                      },
                       enqueueWakeup,
                       onSpawn: async (meta) => {
                         markDispatchStarted();
@@ -26717,6 +26733,7 @@ export function heartbeatService(
               conversationUserId: issues.conversationUserId,
               conversationState: issues.conversationState,
               status: issues.status,
+              statusVersion: issues.statusVersion,
               projectId: issues.projectId,
               projectWorkspaceId: issues.projectWorkspaceId,
               executionWorkspaceId: issues.executionWorkspaceId,
@@ -26942,7 +26959,8 @@ export function heartbeatService(
           if (
             issueStateGuard &&
             (!issueStateGuard.statuses.includes(issue.status) ||
-              issue.assigneeAgentId !== issueStateGuard.assigneeAgentId)
+              issue.assigneeAgentId !== issueStateGuard.assigneeAgentId ||
+              (issueStateGuard.statusVersion !== undefined && issue.statusVersion !== issueStateGuard.statusVersion))
           ) {
             await tx.insert(agentWakeupRequests).values({
               ...durableReceiptFields,
diff --git a/server/src/services/issues.ts b/server/src/services/issues.ts
index b3d297bdf44..f2969a029d3 100644
--- a/server/src/services/issues.ts
+++ b/server/src/services/issues.ts
@@ -10819,6 +10819,12 @@ export function issueService(db: Db) {
           projectGoalId: nextProjectGoalId,
           defaultGoalId: defaultCompanyGoal?.id ?? null,
         });
+        // Ownership changes invalidate observed handoff versions even if status
+        // stays the same, including an A -> B -> A assignment race.
+        if ((issueData.assigneeAgentId !== undefined && issueData.assigneeAgentId !== receiptExisting.assigneeAgentId)
+          || (issueData.assigneeUserId !== undefined && issueData.assigneeUserId !== receiptExisting.assigneeUserId)) {
+          patch.statusVersion = sql`${issues.statusVersion} + 1` as unknown as number;
+        }
         // Reasserting Blocked or changing its blockers is a fresh decision even
         // when the status string stays the same. Invalidate recovery's prior
         // status receipt without treating comment recency as blocking intent.
diff --git a/server/src/services/native-runtime/native-session-executor.ts b/server/src/services/native-runtime/native-session-executor.ts
index 549ea9f4022..9e5347b566e 100644
--- a/server/src/services/native-runtime/native-session-executor.ts
+++ b/server/src/services/native-runtime/native-session-executor.ts
@@ -6889,6 +6889,7 @@ export async function executePaperclipNativeSession(input: {
   runnerRemoteCodexPath?: string | null;
   runnerRemoteCodexNpmSpec?: string | null;
   runnerRemoteProviderPackPath?: string | null;
+  stopTaskForReassignment?: (target: { companyId: string; issueId: string; agentId: string; runId: string | null }) => Promise<void>;
   enqueueWakeup?: (
     agentId: string,
     options: {
@@ -9933,6 +9934,7 @@ export async function createRunnerdBackend(input: {
   runnerRemoteProviderPackPath?: string | null;
   trace?: NativeRunTrace;
   onLog?: (stream: "stdout" | "stderr", chunk: string) => Promise<void>;
+  stopTaskForReassignment?: (target: { companyId: string; issueId: string; agentId: string; runId: string | null }) => Promise<void>;
   enqueueWakeup?: (
     agentId: string,
     options: {
@@ -10048,6 +10050,7 @@ async function createRunnerdBackendWithinSessionClaim(
       : undefined,
     currentWakeComments: currentWakeComments ?? undefined,
     chatAttachmentReadScope: input.chatAttachmentReadScope,
+    stopTaskForReassignment: input.stopTaskForReassignment,
     enqueueWakeup: input.enqueueWakeup,
   });
   const authorityEpoch = new SessionToolAuthorityEpoch(
diff --git a/server/src/services/native-runtime/paperclip-runner-tool-authority.test.ts b/server/src/services/native-runtime/paperclip-runner-tool-authority.test.ts
index eaab6bd5d52..3ea436f3bba 100644
--- a/server/src/services/native-runtime/paperclip-runner-tool-authority.test.ts
+++ b/server/src/services/native-runtime/paperclip-runner-tool-authority.test.ts
@@ -90,7 +90,7 @@ describe("PaperclipRunnerToolAuthority", () => {
       issueId,
       runId,
     });
-    expect(authority.definitions()).toHaveLength(26);
+    expect(authority.definitions()).toHaveLength(27);
     const questions = authority.definitions().find(tool => tool.name === "request_human_input")!;
     expect(questions.description).toContain("ask only the next unanswered question");
     expect(questions.description).toContain("Never infer answers");
diff --git a/server/src/services/native-runtime/paperclip-runner-tool-authority.ts b/server/src/services/native-runtime/paperclip-runner-tool-authority.ts
index 5912b3b2358..e9862d0d540 100644
--- a/server/src/services/native-runtime/paperclip-runner-tool-authority.ts
+++ b/server/src/services/native-runtime/paperclip-runner-tool-authority.ts
@@ -1,3 +1,5 @@
+import { assertAssignableAgent } from "../agent-assignability.js";
+import { authorizationService } from "../authorization.js";
 import { handoffPlanContext } from "./handoff-plan-context.js";
 import { callCreateSkillTool } from "../skill-tools.js";
 import { callProjectTool } from "../project-tools.js";
@@ -23,12 +25,14 @@ import { workspaceFileResourceService } from "../workspace-file-resources.js";
 import { badRequest, forbidden } from "../../errors.js";
 import { searchRunnerApi } from "./runner-api-catalog.js";
 import { executeRunnerApi, validateRunnerApiCall, RUNNER_API_MAX_BYTES, type RunnerApiFile } from "./runner-api-client.js";
-import { and, desc, eq, isNull, notInArray } from "drizzle-orm";
+import { and, desc, eq, isNull, notInArray, sql } from "drizzle-orm";
 import type { Db } from "@paperclipai/db";
 import {
+  activityLog,
   agents,
   agentWakeupRequests,
   chatEndpoints,
+  chatConversations,
   documentRevisions,
   heartbeatRuns,
   issueApprovals,
@@ -76,7 +80,7 @@ const IMPLEMENTED_OPERATIONS = new Set([
   "search_api", "call_api",
   "get_task_context", "get_task_history", "search_tasks", "report_progress",
   "request_human_input",
-  "create_skill", "create_task", "set_dependencies", "create_project", "list_project_repositories", "list_projects", "register_deliverable",
+  "create_skill", "create_task", "reassign_task", "set_dependencies", "create_project", "list_project_repositories", "list_projects", "register_deliverable",
   "list_documents", "read_document", "list_document_revisions", "write_document",
   "list_agents", "get_agent", "list_approvals", "get_approval", "get_approval_context",
 ]);
@@ -106,6 +110,7 @@ type Binding = {
   readRemoteWorkspaceFile?: RemoteWorkspaceFileReader;
   currentWakeComments?: CurrentWakeCommentsBinding;
   chatAttachmentReadScope?: NativeChatAttachmentReadScope;
+  stopTaskForReassignment?: (target: { companyId: string; issueId: string; agentId: string; runId: string | null }) => Promise<void>;
   enqueueWakeup?: (agentId: string, options: {
     source: "assignment";
     triggerDetail: "system";
@@ -115,7 +120,7 @@ type Binding = {
     requestedByActorType: "agent";
     requestedByActorId: string;
     contextSnapshot: Record<string, unknown>;
-    issueStateGuard?: { statuses: string[]; assigneeAgentId: string };
+    issueStateGuard?: { statuses: string[]; assigneeAgentId: string; statusVersion?: number };
   }) => Promise<unknown>;
 };
 
@@ -467,6 +472,7 @@ export class PaperclipRunnerToolAuthority {
         (await captureRunIdentity(this.db, this.binding)).context?.id ?? null);
       case "create_task": return this.#createTask(input,
         (await captureRunIdentity(this.db, this.binding)).context?.id ?? null);
+      case "reassign_task": return this.#reassignTask(input);
       case "set_dependencies": return this.#setDependencies(input);
       case "register_deliverable": return this.#registerDeliverable(input);
       default: throw new Error("paperclip_runner_tool_not_bound");
@@ -909,6 +915,131 @@ export class PaperclipRunnerToolAuthority {
     return result;
   }
 
+
+  async #reassignTask(input: Record<string, unknown>): Promise<unknown> {
+    const key = requiredString(input.idempotencyKey);
+    const taskId = requiredUuid(input.taskId);
+    const assigneeAgentId = requiredUuid(input.assigneeActorId);
+    const expectedOwner = input.expectedAssigneeActorId === null ? null : requiredUuid(input.expectedAssigneeActorId);
+    const expectedVersion = input.expectedStatusVersion;
+    const reason = requiredString(input.reason);
+    if (!Number.isSafeInteger(expectedVersion) || Number(expectedVersion) < 0 || key.length > 240 || reason.length > 20_000) {
+      throw new Error("paperclip_runner_tool_input_invalid");
+    }
+    if (taskId === this.binding.issueId) {
+      throw new Error("paperclip_runner_reassignment_current_task: delegate with create_task; this tool cannot interrupt its own caller");
+    }
+    const durableKey = `reassign:${this.binding.issueId}:${key}`;
+    const fingerprint = createHash("sha256").update(canonicalJson(input)).digest("hex");
+    const priorReceipt = async (tx: Db): Promise<Record<string, unknown> | null> => {
+      const [prior] = await tx.select({ details: activityLog.details }).from(activityLog).where(and(
+        eq(activityLog.companyId, this.binding.companyId), eq(activityLog.action, "issue.reassigned"),
+        sql`${activityLog.details}->>'reassignmentKey' = ${durableKey}`,
+      )).limit(1);
+      if (!prior) return null;
+      if (prior.details?.inputFingerprint !== fingerprint) throw new Error("paperclip_runner_tool_idempotency_conflict");
+      return record(prior.details?.receipt);
+    };
+    const authorize = async (tx: Db, run: typeof heartbeatRuns.$inferSelect) => {
+      const [target] = await tx.select().from(issues).where(and(eq(issues.id, taskId), eq(issues.companyId, this.binding.companyId))).for("update");
+      if (!target) throw new Error("paperclip_runner_task_not_found");
+      const actor = { type: "agent" as const, source: "agent_jwt" as const, companyId: this.binding.companyId,
+        agentId: this.binding.agentId, runId: this.binding.runId, onBehalfOfUserId: run.responsibleUserId };
+      for (const action of ["issue:read", "tasks:assign"] as const) {
+        const decision = await authorizationService(tx).decide({ actor, action, resource: {
+          type: "issue", companyId: this.binding.companyId, issueId: taskId, projectId: target.projectId,
+          parentIssueId: target.parentId, assigneeAgentId: action === "tasks:assign" ? assigneeAgentId : target.assigneeAgentId,
+          assigneeUserId: action === "tasks:assign" ? null : target.assigneeUserId, status: target.status,
+        } });
+        if (!decision.allowed) throw forbidden(decision.explanation);
+      }
+      await assertAssignableAgent(tx, this.binding.companyId, assigneeAgentId, { kind: "work" });
+      const [externalChat] = await tx.select({ id: chatConversations.id }).from(chatConversations).where(and(
+        eq(chatConversations.companyId, this.binding.companyId), eq(chatConversations.issueId, taskId),
+      )).limit(1);
+      if (externalChat) throw new Error("paperclip_runner_reassignment_conversation_locked");
+      return target;
+    };
+    const validate = (target: typeof issues.$inferSelect) => {
+      if (target.conversationAgentId) throw new Error("paperclip_runner_reassignment_conversation_locked");
+      if (["done", "cancelled", "in_review"].includes(target.status) || record(target.executionState).status === "pending") {
+        throw new Error("paperclip_runner_reassignment_state_denied");
+      }
+      if (target.assigneeUserId || target.assigneeAgentId !== expectedOwner || target.statusVersion !== expectedVersion) {
+        throw new Error("paperclip_runner_reassignment_conflict: refresh search_tasks before deciding again");
+      }
+    };
+    // Stop outside row locks: the runtime needs those locks to acknowledge cancellation.
+    // A second locked check below prevents any intervening ownership/version change.
+    const prepared = await this.db.transaction(async (tx) => {
+      const context = await this.#lockAuthorizedMutationContext(tx as unknown as Db);
+      if (context.issue.workMode !== "standard") throw new Error("paperclip_runner_tool_mode_denied");
+      const target = await authorize(tx as unknown as Db, context.run);
+      if (await priorReceipt(tx as unknown as Db)) return null;
+      validate(target);
+      return target;
+    });
+    if (prepared && prepared.assigneeAgentId && prepared.assigneeAgentId !== assigneeAgentId) {
+      if (!this.binding.stopTaskForReassignment && prepared.executionRunId) {
+        throw new Error("paperclip_runner_reassignment_stop_unavailable");
+      }
+      await this.binding.stopTaskForReassignment?.({ companyId: this.binding.companyId, issueId: taskId,
+        agentId: prepared.assigneeAgentId, runId: prepared.executionRunId });
+    }
+    let publication: Awaited<ReturnType<typeof persistActivity>>["publication"] | null = null;
+    const result = await this.#withMutationReceipt("reassign_task", key, input, async (tx, context) => {
+      if (context.issue.workMode !== "standard") throw new Error("paperclip_runner_tool_mode_denied");
+      const target = await authorize(tx, context.run);
+      const prior = await priorReceipt(tx);
+      if (prior) return prior;
+      validate(target);
+      if (target.executionRunId && target.executionRunId !== prepared?.executionRunId) {
+        throw new Error("paperclip_runner_reassignment_conflict: a new execution started; refresh before retrying");
+      }
+      if (target.executionRunId && target.assigneeAgentId !== assigneeAgentId) {
+        const [run] = await tx.select({ status: heartbeatRuns.status }).from(heartbeatRuns).where(eq(heartbeatRuns.id, target.executionRunId));
+        if (run && ["running", "queued", "scheduled_retry"].includes(run.status)) throw new Error("paperclip_runner_reassignment_stop_unconfirmed");
+      }
+      const changed = target.assigneeAgentId !== assigneeAgentId;
+      const updated = changed ? await issueService(tx).update(taskId, {
+        companyGuard: this.binding.companyId, assigneeAgentId, assigneeUserId: null,
+        status: target.status === "in_progress" ? "todo" : target.status,
+        statusVersion: target.statusVersion + 1, actorAgentId: this.binding.agentId,
+      }, tx) : target;
+      if (!updated) throw new Error("paperclip_runner_task_not_found");
+      const receipt = {
+        commandId: `reassign-task:${taskId}:${updated.statusVersion}`, disposition: changed ? "applied" : "duplicate",
+        stateRevision: updated.statusVersion, entityRefs: [taskId],
+        scheduledWakeIds: changed && updated.status === "todo" ? [`${durableKey}:${updated.statusVersion}`] : [],
+      };
+      if (changed) await issueService(tx).addComment(taskId, reason, { agentId: this.binding.agentId, runId: this.binding.runId });
+      const activity = await persistActivity(tx, {
+        companyId: this.binding.companyId, actorType: "agent", actorId: this.binding.agentId,
+        agentId: this.binding.agentId, runId: this.binding.runId, issueId: taskId,
+        action: "issue.reassigned", entityType: "issue", entityId: taskId,
+        details: { source: "paperclip_runner_protocol", reassignmentKey: durableKey, inputFingerprint: fingerprint,
+          previousAssigneeAgentId: target.assigneeAgentId, assigneeAgentId, reason, changed, receipt },
+      });
+      publication = activity.publication;
+      return receipt;
+    }, { beforeReceiptReplay: async (tx, context) => { await authorize(tx, context.run); } }) as {
+      stateRevision: number; scheduledWakeIds: string[];
+    };
+    if (publication) publishActivity(publication);
+    // Replay repairs a failed dispatch. The durable wake key and state/version guard
+    // prevent duplicate successors and prevent waking a later, unrelated assignment.
+    if (result.scheduledWakeIds.length && this.binding.enqueueWakeup) {
+      await this.binding.enqueueWakeup(assigneeAgentId, {
+        source: "assignment", triggerDetail: "system", reason: "issue_assigned",
+        payload: { issueId: taskId, mutation: "reassign_task", reason },
+        idempotencyKey: result.scheduledWakeIds[0]!, requestedByActorType: "agent", requestedByActorId: this.binding.agentId,
+        contextSnapshot: { issueId: taskId, source: "paperclip_runner.reassign_task", reassignmentReason: reason },
+        issueStateGuard: { statuses: ["todo"], assigneeAgentId, statusVersion: result.stateRevision },
+      });
+    }
+    return result;
+  }
+
   async #setDependencies(input: Record<string, unknown>): Promise<unknown> {
     const idempotencyKey = requiredString(input.idempotencyKey);
     if (!Array.isArray(input.blockedByTaskIds)) {
diff --git a/server/src/services/native-runtime/runner-api-catalog.ts b/server/src/services/native-runtime/runner-api-catalog.ts
index fbdbd73b07a..90c1a37b1ab 100644
--- a/server/src/services/native-runtime/runner-api-catalog.ts
+++ b/server/src/services/native-runtime/runner-api-catalog.ts
@@ -48,7 +48,7 @@ function dedicatedTools(method: string, path: string): string[] {
   if (/\/issues\/\{[^}]+\}\/comments$/.test(path)) return method === "GET" ? ["get_task_history"] : ["report_progress"];
   if (/\/issues\/\{[^}]+\}\/documents/.test(path)) return method === "DELETE" ? [] : method === "GET" ? ["list_documents", "read_document", "list_document_revisions"] : ["write_document"];
   if (/\/issues$/.test(path)) return method === "GET" ? ["search_tasks"] : ["create_task"];
-  if (/\/issues\/\{[^}]+\}$/.test(path)) return method === "GET" ? ["get_task_context"] : ["set_dependencies", "finish_task", "block_task", "request_review"];
+  if (/\/issues\/\{[^}]+\}$/.test(path)) return method === "GET" ? ["get_task_context"] : ["reassign_task", "set_dependencies", "finish_task", "block_task", "request_review"];
   if (/\/agents$/.test(path) && method === "GET") return ["list_agents"];
   if (/\/agents\/(me|\{[^}]+\})$/.test(path) && method === "GET") return ["get_agent"];
   if (/\/approvals$/.test(path) && method === "GET") return ["list_approvals"];
diff --git a/server/src/services/native-runtime/task-reassignment.test.ts b/server/src/services/native-runtime/task-reassignment.test.ts
new file mode 100644
index 00000000000..1c9cb35f30e
--- /dev/null
+++ b/server/src/services/native-runtime/task-reassignment.test.ts
@@ -0,0 +1,165 @@
+import { randomUUID } from "node:crypto";
+import { afterAll, beforeAll, describe, expect, it, vi } from "vitest";
+import { eq, and } from "drizzle-orm";
+import { activityLog, agents, companies, createDb, heartbeatRuns, issues, issueComments } from "@paperclipai/db";
+import { startEmbeddedPostgresTestDatabase } from "../../__tests__/helpers/embedded-postgres.js";
+import { issueService } from "../issues.js";
+import { PaperclipRunnerToolAuthority } from "./paperclip-runner-tool-authority.js";
+
+describe("runner task reassignment", () => {
+  let temporary: Awaited<ReturnType<typeof startEmbeddedPostgresTestDatabase>>;
+  let db: ReturnType<typeof createDb>;
+  beforeAll(async () => {
+    temporary = await startEmbeddedPostgresTestDatabase("runner-reassign-");
+    db = createDb(temporary.connectionString);
+  });
+  afterAll(async () => { await temporary?.cleanup(); });
+
+  async function fixture(status = "todo") {
+    const companyId = randomUUID(), agentId = randomUUID(), nextId = randomUUID(), issueId = randomUUID(), targetId = randomUUID(), runId = randomUUID();
+    await db.insert(companies).values({ id: companyId, name: "Reassignment", issuePrefix: `R${companyId.slice(0, 6)}` });
+    await db.insert(agents).values([
+      { id: agentId, companyId, name: "Manager", role: "ceo", status: "active", adapterType: "paperclip_runner" },
+      { id: nextId, companyId, name: "Engineer", role: "engineer", status: "active", adapterType: "paperclip_runner" },
+    ]);
+    await db.insert(issues).values([
+      { id: issueId, companyId, title: "Coordinate", status: "in_progress", assigneeAgentId: agentId },
+      { id: targetId, companyId, title: "Existing work", status, assigneeAgentId: agentId, description: "Keep the existing plan and context" },
+    ]);
+    await db.insert(heartbeatRuns).values({ id: runId, companyId, agentId, status: "running", runtimeMode: "native", nativeIssueId: issueId, invocationSource: "assignment", triggerDetail: "system", contextSnapshot: { issueId } });
+    await db.update(issues).set({ executionRunId: runId }).where(eq(issues.id, issueId));
+    const enqueueWakeup = vi.fn().mockResolvedValue({ id: randomUUID() });
+    const stopTaskForReassignment = vi.fn().mockResolvedValue(undefined);
+    const binding = { companyId, agentId, issueId, runId, enqueueWakeup, stopTaskForReassignment };
+    const authority = new PaperclipRunnerToolAuthority(db, binding);
+    const call = { tool: "reassign_task", callId: "handoff", arguments: { taskId: targetId, assigneeActorId: nextId, expectedAssigneeActorId: agentId, expectedStatusVersion: 0, reason: "Engineer owns implementation; retain the existing plan.", idempotencyKey: "handoff" } };
+    const target = async () => (await db.select().from(issues).where(eq(issues.id, targetId)))[0]!;
+    return { companyId, agentId, nextId, issueId, targetId, runId, authority, binding, call, target, enqueueWakeup, stopTaskForReassignment };
+  }
+
+  it("moves existing work once, persists context and audit, and dispatches a guarded wake", async () => {
+    const f = await fixture();
+    const receipt = await f.authority.execute(f.call);
+    expect(await f.target()).toMatchObject({ assigneeAgentId: f.nextId, status: "todo", statusVersion: 1, description: "Keep the existing plan and context" });
+    await expect(f.authority.execute({ ...f.call, callId: "retry" })).resolves.toEqual(receipt);
+    expect(f.stopTaskForReassignment).toHaveBeenCalledTimes(1);
+    expect(f.enqueueWakeup).toHaveBeenCalledWith(f.nextId, expect.objectContaining({ issueStateGuard: { statuses: ["todo"], assigneeAgentId: f.nextId, statusVersion: 1 } }));
+    expect(f.enqueueWakeup.mock.calls[0]![1].idempotencyKey).toEqual(f.enqueueWakeup.mock.calls[1]![1].idempotencyKey);
+    expect(await db.select().from(activityLog).where(and(eq(activityLog.companyId, f.companyId), eq(activityLog.action, "issue.reassigned")))).toHaveLength(1);
+    expect(await db.select().from(issueComments).where(eq(issueComments.issueId, f.targetId))).toHaveLength(1);
+  });
+
+  it.each(["blocked", "backlog"])("preserves %s and does not wake work prematurely", async status => {
+    const f = await fixture(status);
+    await f.authority.execute(f.call);
+    expect(await f.target()).toMatchObject({ assigneeAgentId: f.nextId, status });
+    expect(f.enqueueWakeup).not.toHaveBeenCalled();
+  });
+
+  it("replays across a replacement caller run without a second mutation", async () => {
+    const f = await fixture();
+    const receipt = await f.authority.execute(f.call);
+    const replacement = randomUUID();
+    await db.insert(heartbeatRuns).values({ id: replacement, companyId: f.companyId, agentId: f.agentId, nativeIssueId: f.issueId, runtimeMode: "native", status: "running", invocationSource: "assignment", triggerDetail: "system" });
+    await db.update(issues).set({ executionRunId: replacement }).where(eq(issues.id, f.issueId));
+    await expect(new PaperclipRunnerToolAuthority(db, { ...f.binding, runId: replacement }).execute(f.call)).resolves.toEqual(receipt);
+    expect((await f.target()).statusVersion).toBe(1);
+  });
+
+  it("repairs a dispatch failure by replaying the committed receipt", async () => {
+    const f = await fixture();
+    f.enqueueWakeup.mockRejectedValueOnce(new Error("queue unavailable"));
+    await expect(f.authority.execute(f.call)).rejects.toThrow("queue unavailable");
+    expect((await f.target()).assigneeAgentId).toBe(f.nextId);
+    await f.authority.execute(f.call);
+    expect(f.stopTaskForReassignment).toHaveBeenCalledTimes(1);
+    expect(f.enqueueWakeup).toHaveBeenCalledTimes(2);
+  });
+
+  it("rejects key reuse with different input and stale ownership/version", async () => {
+    const f = await fixture();
+    await f.authority.execute(f.call);
+    await expect(f.authority.execute({ ...f.call, arguments: { ...f.call.arguments, reason: "Changed intent" } })).rejects.toThrow("idempotency_conflict");
+    await expect(f.authority.execute({ ...f.call, arguments: { ...f.call.arguments, idempotencyKey: "stale" } })).rejects.toThrow("reassignment_conflict");
+  });
+
+  it("stops active execution before transferring ownership", async () => {
+    const f = await fixture("in_progress");
+    const oldRun = randomUUID();
+    await db.insert(heartbeatRuns).values({ id: oldRun, companyId: f.companyId, agentId: f.agentId, nativeIssueId: f.targetId, runtimeMode: "native", status: "running", invocationSource: "assignment", triggerDetail: "system" });
+    await db.update(issues).set({ executionRunId: oldRun, checkoutRunId: oldRun }).where(eq(issues.id, f.targetId));
+    f.stopTaskForReassignment.mockImplementationOnce(async () => {
+      expect((await f.target()).assigneeAgentId).toBe(f.agentId);
+      await db.update(heartbeatRuns).set({ status: "cancelled" }).where(eq(heartbeatRuns.id, oldRun));
+    });
+    await f.authority.execute(f.call);
+    expect(await f.target()).toMatchObject({ assigneeAgentId: f.nextId, status: "todo", executionRunId: null, checkoutRunId: null });
+  });
+
+  it("does not transfer ownership if stop fails or a new run races the stop", async () => {
+    const f = await fixture();
+    f.stopTaskForReassignment.mockRejectedValueOnce(new Error("stop failed"));
+    await expect(f.authority.execute(f.call)).rejects.toThrow("stop failed");
+    expect((await f.target()).assigneeAgentId).toBe(f.agentId);
+    f.stopTaskForReassignment.mockImplementationOnce(async () => {
+      const runId = randomUUID();
+      await db.insert(heartbeatRuns).values({ id: runId, companyId: f.companyId, agentId: f.agentId, status: "running", invocationSource: "assignment", triggerDetail: "system" });
+      await db.update(issues).set({ executionRunId: runId }).where(eq(issues.id, f.targetId));
+    });
+    await expect(f.authority.execute(f.call)).rejects.toThrow("reassignment_conflict");
+    expect(f.enqueueWakeup).not.toHaveBeenCalled();
+  });
+
+  it.each(["done", "cancelled", "in_review"])("rejects %s before interrupting work", async status => {
+    const f = await fixture(status);
+    await expect(f.authority.execute(f.call)).rejects.toThrow("state_denied");
+    expect(f.stopTaskForReassignment).not.toHaveBeenCalled();
+  });
+
+  it("rejects conversations and the caller’s own task", async () => {
+    const f = await fixture();
+    await db.update(issues).set({ conversationAgentId: f.agentId, conversationUserId: "test-user", conversationState: "active", status: "in_progress" }).where(eq(issues.id, f.targetId));
+    await expect(f.authority.execute(f.call)).rejects.toThrow("conversation_locked");
+    await expect(f.authority.execute({ ...f.call, arguments: { ...f.call.arguments, taskId: f.issueId } })).rejects.toThrow("current_task");
+    expect(f.stopTaskForReassignment).not.toHaveBeenCalled();
+  });
+
+  it.each(["planning", "ask"])("denies reassignment from %s mode", async workMode => {
+    const f = await fixture();
+    await db.update(issues).set({ workMode }).where(eq(issues.id, f.issueId));
+    await expect(f.authority.execute(f.call)).rejects.toThrow("mode_denied");
+  });
+
+  it("denies foreign targets and unavailable assignees", async () => {
+    const f = await fixture(), foreign = await fixture();
+    await expect(f.authority.execute({ ...f.call, arguments: { ...f.call.arguments, taskId: foreign.targetId } })).rejects.toThrow("task_not_found");
+    await expect(f.authority.execute({ ...f.call, arguments: { ...f.call.arguments, assigneeActorId: foreign.agentId } })).rejects.toThrow();
+    await db.update(agents).set({ status: "pending_approval" }).where(eq(agents.id, f.nextId));
+    await expect(f.authority.execute(f.call)).rejects.toThrow();
+    expect(f.stopTaskForReassignment).not.toHaveBeenCalled();
+  });
+  it("rejects an ownership ABA race through the existing issue service", async () => {
+    const f = await fixture();
+    await issueService(db).update(f.targetId, { assigneeAgentId: f.nextId });
+    await issueService(db).update(f.targetId, { assigneeAgentId: f.agentId });
+    expect((await f.target()).statusVersion).toBe(2);
+    await expect(f.authority.execute(f.call)).rejects.toThrow("reassignment_conflict");
+    expect(f.stopTaskForReassignment).not.toHaveBeenCalled();
+  });
+
+  it("respects protected assignment policies instead of inheriting board authority", async () => {
+    const f = await fixture();
+    await db.update(agents).set({ permissions: { authorizationPolicy: { protectedAgent: { blockAssignment: true } } } }).where(eq(agents.id, f.nextId));
+    await expect(f.authority.execute(f.call)).rejects.toThrow();
+    expect((await f.target()).assigneeAgentId).toBe(f.agentId);
+    expect(f.stopTaskForReassignment).not.toHaveBeenCalled();
+  });
+
+  it("rejects writes after the caller loses its run binding", async () => {
+    const f = await fixture();
+    await db.update(heartbeatRuns).set({ status: "cancelled" }).where(eq(heartbeatRuns.id, f.runId));
+    await expect(f.authority.execute(f.call)).rejects.toThrow("binding_not_authorized");
+    expect((await f.target()).assigneeAgentId).toBe(f.agentId);
+  });
+
+});
diff --git a/tests/runner-e2e/README.md b/tests/runner-e2e/README.md
index 7d54c59de8b..d8a662620e4 100644
--- a/tests/runner-e2e/README.md
+++ b/tests/runner-e2e/README.md
@@ -132,18 +132,23 @@ minutes, the cell to thirty minutes, and cleanup explicitly deletes the
 sandbox rather than waiting for Daytona's idle timeout.
 
 `agent-chat` (**Persistent Agent Chat**) adds six workflows on `legacy-codex`,
-`legacy-claude`, `runner-codex`, and `runner-acpx-claude`: **24 local cells**.
+`legacy-claude`, `runner-codex`, and `runner-acpx-claude`: **26 local cells**.
 They cover continuity across server restart, fresh context after `/new`,
 Stop/reset/resume, draft/revise/approve/plan handoff, clarification with existing
 project reuse, and a new project with two repository URLs. Each cell opens the
 production chat surface and resolves the backing issue through the chat API.
 The source conversation must settle to `in_review` / `waiting`; handed-off
 execution tasks must finish with their initial Plan and output documents.
-Reset runs are retained separately from the 68 expected provider turns in this
+Reset runs are retained separately from the 72 expected provider turns in this
 suite. Cancelled turns and execution-task runs remain included in billing and
 cleanup. The production chat directive is injected normally; fixtures do not
 replace it with completion instructions. Daytona is excluded.
 
+The native Codex and Claude profiles also cover reassignment of existing ready
+and backlog tasks. The oracle verifies stable task IDs, preserved descriptions,
+assignment audit evidence, exactly one successful successor run and its output
+document, no backlog execution, and a usable source conversation after reload.
+
 ```bash
 # Run these after deterministic checks, with the required provider keys set.
 pnpm test:e2e:runner -- --id agent-chat.legacy-codex.local.continuity-restart
@@ -168,7 +173,7 @@ Both suites save and restore experimental settings. Browser E2E always starts a
 throwaway instance; never point the authenticated suite at the running demo.
 Missing provider credentials fail paid preflight and are not passing coverage.
 
-The default `--all` selection is 167 cells (144 local and 23 Daytona) and 363
+The default `--all` selection is 169 cells (146 local and 23 Daytona) and 367
 expected paid agent turns. The explicit-only everyday suite adds 35 catalog cells
 and is excluded from `--all`. Follow-up steps remain ordered within their cell; all other
 cells are independent. Narrow selectors are strongly recommended while
@@ -455,7 +460,7 @@ Set `RUNNER_E2E_AWS_ENABLED=true` to route paid cells to the repository-scoped
 ephemeral AWS RunsOn fleet selected by
 `runs-on/fleet=paperclip-public-pr-x64/env=public-ci`. Any other value uses the
 proven GitHub-hosted `ubuntu-latest` target. Set `RUNNER_E2E_MAX_PARALLEL` to an
-integer from 1–100 on AWS (default 100). The 167-cell default selection takes more than
+integer from 1–100 on AWS (default 100). The 169-cell default selection takes more than
 one wave at that limit; use suite selectors for smaller campaigns. The fallback runner retains its 1–57 limit and
 default of 32. Multi-turn steps are sequential inside their cell while
 independent cells overlap. Artifacts and merged HTML/JUnit/normalized reports
diff --git a/tests/runner-e2e/catalog.test.ts b/tests/runner-e2e/catalog.test.ts
index e911c3af523..f0f24e74372 100644
--- a/tests/runner-e2e/catalog.test.ts
+++ b/tests/runner-e2e/catalog.test.ts
@@ -41,10 +41,10 @@ describe("runner E2E catalog", () => {
     expect(localIntegrityTasks).toHaveLength(2);
     expect(openRouterBreadthTasks).toHaveLength(3);
     expect(runnerSuites.map((suite) => suite.expectedMatrixSize)).toEqual([
-      23, 38, 52, 24, 42, 14, 10, 2,
+      23, 38, 52, 26, 42, 14, 10, 2,
     ]);
-    expect(validateRunnerCatalog()).toHaveLength(205);
-    expect(new Set(runnerMatrix.map((entry) => entry.id)).size).toBe(205);
+    expect(validateRunnerCatalog()).toHaveLength(207);
+    expect(new Set(runnerMatrix.map((entry) => entry.id)).size).toBe(207);
     expect(
       runnerMatrix.filter((entry) => entry.suite.id === "core-compatibility"),
     ).toHaveLength(42);
@@ -68,7 +68,7 @@ describe("runner E2E catalog", () => {
         (total, execution) => total + execution.task.expectedRunCount,
         0,
       ),
-    ).toBe(363);
+    ).toBe(367);
     expect(
       runnerTasks.find((task) => task.id === "plan-revise-accept")
         ?.attemptTimeoutMs,
@@ -561,10 +561,10 @@ describe("runner E2E selectors", () => {
     const jobs = buildMatrixJobs(
       selectRunnerExecutions(parseRunnerSelectors(["--all"])),
     );
-    expect(jobs).toHaveLength(167);
+    expect(jobs).toHaveLength(169);
     expect(jobs.filter((job) => job.needsDaytona)).toHaveLength(23);
-    expect(jobs.filter((job) => !job.needsDaytona)).toHaveLength(144);
-    expect(new Set(jobs.map((job) => job.executionId)).size).toBe(167);
+    expect(jobs.filter((job) => !job.needsDaytona)).toHaveLength(146);
+    expect(new Set(jobs.map((job) => job.executionId)).size).toBe(169);
     expect(
       jobs.find(
         (job) =>
diff --git a/tests/runner-e2e/catalog.ts b/tests/runner-e2e/catalog.ts
index dde22bde305..c7b2f36d36a 100644
--- a/tests/runner-e2e/catalog.ts
+++ b/tests/runner-e2e/catalog.ts
@@ -929,8 +929,9 @@ export const runnerSuites: readonly RunnerSuiteFixture[] = [
     description: "Task-backed conversations, session resets, and project plan handoff.",
     groups: ["chat"],
     profiles: runnerProfiles.filter(profile => ["legacy-codex", "legacy-claude", "runner-codex", "runner-acpx-claude"].includes(profile.id)),
-    environments: [localEnvironment], tasks: chatTasks, expectedMatrixSize: 24,
-    definitionMetadata: { version: 1, resetRunsCountedSeparately: true },
+    environments: [localEnvironment], tasks: chatTasks, expectedMatrixSize: 26,
+    excludedExecutionIds: ["legacy-codex", "legacy-claude"].map(profile => `agent-chat.${profile}.local.reassign-task`),
+    definitionMetadata: { version: 2, resetRunsCountedSeparately: true },
   },
   ...(process.env.PAPERCLIP_RUNNER_E2E_CONNECTION_REVIEWS === "1" ? [connectionReviewSuite] : []),
   {
diff --git a/tests/runner-e2e/chat-cases.ts b/tests/runner-e2e/chat-cases.ts
index a3fcf4cbbd6..2226c9601b6 100644
--- a/tests/runner-e2e/chat-cases.ts
+++ b/tests/runner-e2e/chat-cases.ts
@@ -10,6 +10,7 @@ export function chatMarker(
 }
 
 export const CHAT_CASES = [
+  ["reassign-task", "Reassign existing work and preserve queued context", 2],
   ["continuity-restart", "Conversation continuity across restart", 3],
   ["new-session", "Fresh context within preserved history", 2],
   ["stop-new-resume", "Stop, reset, and resume", 3],
diff --git a/tests/runner-e2e/chat-flow.test.ts b/tests/runner-e2e/chat-flow.test.ts
index 5b705952dda..79d03798269 100644
--- a/tests/runner-e2e/chat-flow.test.ts
+++ b/tests/runner-e2e/chat-flow.test.ts
@@ -2,6 +2,7 @@ import { describe, it, expect, vi } from "vitest";
 import type { AskUserQuestionsPayload } from "../../packages/shared/src/types/issue.js";
 import {
   assertChatHandoff,
+  assertChatReassignment,
   assertChatTaskHandoff,
   chatQuestionPresentation,
   chatRunFailure,
@@ -95,11 +96,11 @@ describe("chat acceptance contracts", () => {
     );
     expect(chatMarker("CHAT", "one-1")).not.toBe(chatMarker("CHAT", "two-1"));
   });
-  it("has exactly six workflows on the four chosen local profiles", () => {
+  it("covers existing workflows and native reassignment on the chosen local profiles", () => {
     const matrix = runnerMatrix.filter(
       (cell) => cell.suite.id === "agent-chat",
     );
-    expect(matrix).toHaveLength(24);
+    expect(matrix).toHaveLength(26);
     expect(new Set(matrix.map((cell) => cell.profile.id))).toEqual(
       new Set([
         "legacy-codex",
@@ -108,7 +109,7 @@ describe("chat acceptance contracts", () => {
         "runner-acpx-claude",
       ]),
     );
-    expect(new Set(matrix.map((cell) => cell.task.id)).size).toBe(6);
+    expect(new Set(matrix.map((cell) => cell.task.id)).size).toBe(7);
     expect(
       matrix.every(
         (cell) =>
@@ -363,3 +364,25 @@ describe("chat acceptance contracts", () => {
     ).toBe(false);
   });
 });
+
+
+describe("reassignment outcome oracle", () => {
+  const evidence = () => ({ readyId: "ready", queuedId: "queued", teammateId: "riley",
+    tasks: [{ id: "ready", companyId: "co", title: "Ready", status: "done", assigneeAgentId: "riley" }, { id: "queued", companyId: "co", title: "Later", status: "backlog", assigneeAgentId: "riley" }],
+    runs: [{ id: "successor", companyId: "co", agentId: "riley", status: "succeeded", runtimeMode: "native", contextSnapshot: { issueId: "ready" } }],
+    audit: [{ action: "issue.reassigned", details: { source: "paperclip_runner_protocol" } }], outputBody: "Launch CHECK123", marker: "CHECK123",
+  });
+  it("accepts persisted ownership and exactly one successful successor", () => {
+    expect(() => assertChatReassignment(evidence())).not.toThrow();
+  });
+  it.each(["owner", "duplicate", "missing-run", "missing-audit", "backlog-started", "missing-output"])("rejects %s evidence", defect => {
+    const data = evidence();
+    if (defect === "owner") data.tasks[0]!.assigneeAgentId = "old";
+    if (defect === "duplicate") data.tasks.push({ ...data.tasks[0]!, id: "replacement" });
+    if (defect === "missing-run") data.runs = [];
+    if (defect === "missing-audit") data.audit = [];
+    if (defect === "backlog-started") data.runs.push({ ...data.runs[0]!, id: "early", contextSnapshot: { issueId: "queued" } });
+    if (defect === "missing-output") data.outputBody = "I reassigned it";
+    expect(() => assertChatReassignment(data)).toThrow();
+  });
+});
diff --git a/tests/runner-e2e/chat-flow.ts b/tests/runner-e2e/chat-flow.ts
index 6becdb69e7b..c916a04496c 100644
--- a/tests/runner-e2e/chat-flow.ts
+++ b/tests/runner-e2e/chat-flow.ts
@@ -249,12 +249,30 @@ export async function sendChatMessage(page: Page, message: string) {
   await page.getByTestId("task-chat-composer-send").last().click();
 }
 
+
+/** Independent durable oracle: prose alone cannot make a reassignment pass. */
+export function assertChatReassignment(input: {
+  readyId: string; queuedId: string; teammateId: string; tasks: ChatIssue[]; runs: ChatRun[];
+  audit: Array<{ action: string; details?: Record<string, unknown> }>; outputBody: string; marker: string;
+}) {
+  expect(input.tasks.map(task => task.id).sort()).toEqual([input.readyId, input.queuedId].sort());
+  expect(input.tasks.find(task => task.id === input.readyId)).toMatchObject({ status: "done", assigneeAgentId: input.teammateId });
+  expect(input.tasks.find(task => task.id === input.queuedId)).toMatchObject({ status: "backlog", assigneeAgentId: input.teammateId });
+  const successor = input.runs.filter(run => run.contextSnapshot?.issueId === input.readyId);
+  expect(successor).toHaveLength(1);
+  expect(successor[0]).toMatchObject({ agentId: input.teammateId, status: "succeeded", runtimeMode: "native" });
+  expect(input.runs.filter(run => run.contextSnapshot?.issueId === input.queuedId)).toHaveLength(0);
+  expect(input.audit.filter(row => row.action === "issue.reassigned" && row.details?.source === "paperclip_runner_protocol")).toHaveLength(1);
+  expect(input.outputBody).toContain(input.marker);
+}
+
 export async function runChatFlow(input: {
   page: Page;
   api: RunnerApi;
   fixtures: LiveFixtureValues;
   execution: MatrixExecution;
   nonce: string;
+  workspacePath: string;
   restart: () => Promise<void>;
   observe: (issue: ChatIssue, runs: ChatRun[]) => void;
   capture: (id: string, label: string, file: string) => Promise<void>;
@@ -465,6 +483,39 @@ export async function runChatFlow(input: {
       }
       expect(issue!.id).toBe(initialId);
       await noTasks();
+    } else if (caseId === "reassign-task") {
+      const config = execution.profile.buildAgent({
+        environmentId: f.environment.id, environmentFixtureId: execution.environment.id,
+        workspacePath: input.workspacePath, secretRefs: f.secretRefs, executionId: nonce,
+      });
+      const teammate = await api.post<{ id: string }>(`/api/companies/${f.company.id}/agents`, {
+        ...config, name: "Riley Reassignment", role: "engineer", reportsTo: f.agent.id,
+        instructionsBundle: { entryFile: "AGENTS.md", files: { "AGENTS.md": "Complete the assigned work and save the requested Paperclip document." } },
+      });
+      const queued = await api.post<ChatIssue>(`/api/companies/${f.company.id}/issues`, {
+        title: `Later checklist ${nonce}`, description: `Preserve this deferred scope ${draftMarker}.`,
+        status: "backlog", assigneeAgentId: f.agent.id,
+      });
+      const ready = await api.post<ChatIssue>(`/api/companies/${f.company.id}/issues`, {
+        title: `Ready checklist ${nonce}`, status: "todo",
+        description: `Write a short launch checklist as a Paperclip document attached to this task, including ${marker}. Complete this task after saving it.`,
+      });
+      await turn(`Assign the existing Ready checklist ${nonce} task to Riley Reassignment so Riley completes it. Also move the existing Later checklist ${nonce} task from you to Riley, keeping it in backlog. Preserve both tasks and their descriptions. Explain the handoff briefly here. Do not create replacement tasks or start the backlog work.`, 2);
+      const observedTasks = await tasks();
+      const readyAfter = await api.get<ChatIssue>(`/api/issues/${ready.id}`);
+      const queuedAfter = await api.get<ChatIssue>(`/api/issues/${queued.id}`);
+      const output = await readChatOutputDocument(api, ready.id, marker);
+      const activity = await api.get<Array<{ action: string; details?: Record<string, unknown> }>>(`/api/issues/${ready.id}/activity`);
+      assertChatReassignment({ readyId: ready.id, queuedId: queued.id, teammateId: teammate.id, tasks: observedTasks, runs,
+        audit: activity, outputBody: output.body, marker });
+      expect(queuedAfter).toMatchObject({ assigneeAgentId: teammate.id, status: "backlog", description: `Preserve this deferred scope ${draftMarker}.` });
+      expect(readyAfter).toMatchObject({ assigneeAgentId: teammate.id, status: "done" });
+      expect(issue!).toMatchObject({ assigneeAgentId: f.agent.id, conversationState: "waiting" });
+      await page.reload({ waitUntil: "domcontentloaded", timeout: 60_000 });
+      await expect(page.getByTestId("task-chat-composer-input")).toBeVisible();
+      await expect(page.getByRole("link", { name: readyAfter.identifier! }).first()).toBeVisible();
+      await input.capture("chat-reassignment", "Reassignment completed in Agent Chat", "chat-reassignment.png");
+      await input.evidence("chat-reassignment.json", { tasks: observedTasks, runs, activity, output, teammateId: teammate.id });
     } else {
       let existingProject: { id: string; name: string } | undefined;
       let acceptedPlan: Plan | undefined;
diff --git a/tests/runner-e2e/runner.spec.ts b/tests/runner-e2e/runner.spec.ts
index 19ff9d9cb59..1523fa36706 100644
--- a/tests/runner-e2e/runner.spec.ts
+++ b/tests/runner-e2e/runner.spec.ts
@@ -814,7 +814,7 @@ for (const execution of executions) {
         matcherResults = story.evidence.checks.map(check => ({ matcher: { kind: "json_path" as const, path: check.id, expected: true }, passed: check.passed, detail: check.detail }));
       } else if (execution.task.flow === "agent_chat") {
         const chat = await runChatFlow({
-          page, api, fixtures, execution, nonce,
+          page, api, fixtures, execution, nonce, workspacePath,
           restart: () => restartIsolatedPaperclipServer({ api, requestId: `chat-${nonce}`, deadlineAt: startedAtMs + deadlineMs }),
           observe: (chatIssue, chatRuns) => { issue = chatIssue; selectedRuns = chatRuns; },
           capture: captureScreenshot,