diff --git a/server/src/__tests__/issue-agent-mutation-ownership-routes.test.ts b/server/src/__tests__/issue-agent-mutation-ownership-routes.test.ts
index 7ad5bf0b573..4d838fb83a6 100644
--- a/server/src/__tests__/issue-agent-mutation-ownership-routes.test.ts
+++ b/server/src/__tests__/issue-agent-mutation-ownership-routes.test.ts
@@ -194,26 +194,43 @@ function makeAgent(id: string, overrides: Record<string, unknown> = {}) {
   };
 }
 
-function createRunContextDb(contextSnapshot: Record<string, unknown> = {}) {
+function createRunContextDb(
+  contextSnapshot: Record<string, unknown> = {},
+  runAgentId: string = ownerAgentId,
+  runId: string = ownerRunId,
+) {
   return {
     transaction: async (callback: (tx: Record<string, never>) => Promise<unknown>) => callback({}),
-    select: vi.fn(() => ({
+    select: vi.fn((selection: Record<string, unknown> = {}) => ({
       from: vi.fn(() => ({
         where: vi.fn(() => ({
-          then: async (resolve: (rows: unknown[]) => unknown) =>
-            resolve([{
-              id: ownerRunId,
-              companyId,
-              agentId: ownerAgentId,
-              contextSnapshot,
-            }]),
+          then: async (resolve: (rows: unknown[]) => unknown) => {
+            const keys = Object.keys(selection);
+            if (keys.includes("contextSnapshot")) {
+              return resolve([{
+                id: runId,
+                companyId,
+                agentId: runAgentId,
+                contextSnapshot,
+              }]);
+            }
+            if (keys.includes("permissions")) {
+              return resolve([{ id: runAgentId, companyId, permissions: {}, role: "engineer", reportsTo: null }]);
+            }
+            return resolve([{ id: runAgentId, companyId, permissions: {}, role: "engineer", reportsTo: null }]);
+          },
         })),
       })),
     })),
   };
 }
 
-async function createApp(actor: Record<string, unknown>, db: unknown = createRunContextDb()) {
+async function createApp(actor: Record<string, unknown>, db?: unknown) {
+  const routeDb = db ?? createRunContextDb(
+    {},
+    typeof actor.agentId === "string" ? actor.agentId : ownerAgentId,
+    typeof actor.runId === "string" ? actor.runId : ownerRunId,
+  );
   const [{ errorHandler }, { issueRoutes }] = await Promise.all([
     vi.importActual<typeof import("../middleware/index.js")>("../middleware/index.js"),
     vi.importActual<typeof import("../routes/issues.js")>("../routes/issues.js"),
@@ -224,7 +241,7 @@ async function createApp(actor: Record<string, unknown>, db: unknown = createRun
     (req as any).actor = actor;
     next();
   });
-  app.use("/api", issueRoutes(db as any, mockStorageService as any));
+  app.use("/api", issueRoutes(routeDb as any, mockStorageService as any));
   app.use(errorHandler);
   return app;
 }
@@ -280,10 +297,26 @@ describe("agent issue mutation checkout ownership", () => {
     mockAccessService.canUser.mockReset();
     mockAccessService.decide.mockReset();
     mockAccessService.decide.mockImplementation(async (input: { action: string }) => ({
-      allowed: input.action === "tasks:assign",
+      allowed:
+        input.action === "tasks:assign" ||
+        input.action === "issue:read" ||
+        input.action === "issue:mutate" ||
+        input.action === "company_scope:read",
       action: input.action,
-      reason: input.action === "tasks:assign" ? "allow_explicit_grant" : "deny_missing_grant",
-      explanation: input.action === "tasks:assign" ? "Allowed by test assignment default." : "Missing permission.",
+      reason:
+        input.action === "tasks:assign" ||
+          input.action === "issue:read" ||
+          input.action === "issue:mutate" ||
+          input.action === "company_scope:read"
+          ? "allow_explicit_grant"
+          : "deny_missing_grant",
+      explanation:
+        input.action === "tasks:assign" ||
+          input.action === "issue:read" ||
+          input.action === "issue:mutate" ||
+          input.action === "company_scope:read"
+          ? "Allowed by test default."
+          : "Missing permission.",
     }));
     mockAccessService.hasPermission.mockReset();
     mockAgentService.getById.mockReset();
@@ -486,6 +519,16 @@ describe("agent issue mutation checkout ownership", () => {
         request(app).put(`/api/issues/${issueId}/documents/plan`).send({ format: "markdown", body: "# blocked" }),
     ],
     ["work product update", (app: express.Express) => request(app).patch("/api/work-products/product-1").send({ title: "Blocked" })],
+    [
+      "low-trust promotion",
+      (app: express.Express) =>
+        request(app).post(`/api/issues/${issueId}/low-trust/promotions`).send({
+          sourceArtifactKind: "comment",
+          sourceArtifactId: recoveryActionId,
+          title: "Promoted artifact",
+          summary: "Sanitized output",
+        }),
+    ],
     [
       "attachment upload",
       (app: express.Express) =>
@@ -503,6 +546,7 @@ describe("agent issue mutation checkout ownership", () => {
     expect(mockIssueService.update).not.toHaveBeenCalled();
     expect(mockIssueService.addComment).not.toHaveBeenCalled();
     expect(mockDocumentService.upsertIssueDocument).not.toHaveBeenCalled();
+    expect(mockWorkProductService.createForIssue).not.toHaveBeenCalled();
     expect(mockWorkProductService.update).not.toHaveBeenCalled();
     expect(mockStorageService.putFile).not.toHaveBeenCalled();
     expect(mockStorageService.deleteObject).not.toHaveBeenCalled();
@@ -542,6 +586,16 @@ describe("agent issue mutation checkout ownership", () => {
     ],
     ["work product update", (app: express.Express) => request(app).patch("/api/work-products/product-1").send({ title: "Blocked" })],
     ["work product delete", (app: express.Express) => request(app).delete("/api/work-products/product-1")],
+    [
+      "low-trust promotion",
+      (app: express.Express) =>
+        request(app).post(`/api/issues/${issueId}/low-trust/promotions`).send({
+          sourceArtifactKind: "comment",
+          sourceArtifactId: recoveryActionId,
+          title: "Promoted artifact",
+          summary: "Sanitized output",
+        }),
+    ],
     [
       "attachment upload",
       (app: express.Express) =>
@@ -693,10 +747,18 @@ describe("agent issue mutation checkout ownership", () => {
 
   it("allows agents with the active-checkout management grant to mutate active checkouts", async () => {
     mockAccessService.decide.mockImplementation(async (input: { action: string }) => ({
-      allowed: input.action === "tasks:manage_active_checkouts",
+      allowed: input.action === "issue:mutate" || input.action === "tasks:manage_active_checkouts",
       action: input.action,
-      reason: input.action === "tasks:manage_active_checkouts" ? "allow_explicit_grant" : "deny_missing_grant",
-      explanation: input.action === "tasks:manage_active_checkouts" ? "Allowed by checkout management grant." : "Missing permission.",
+      reason:
+        input.action === "issue:mutate" || input.action === "tasks:manage_active_checkouts"
+          ? "allow_explicit_grant"
+          : "deny_missing_grant",
+      explanation:
+        input.action === "tasks:manage_active_checkouts"
+          ? "Allowed by checkout management grant."
+          : input.action === "issue:mutate"
+            ? "Allowed by test boundary default."
+            : "Missing permission.",
     }));
 
     const res = await request(await createApp(peerActor())).patch(`/api/issues/${issueId}`).send({ title: "Managed update" });
@@ -846,6 +908,15 @@ describe("agent issue mutation checkout ownership", () => {
       reason: "deny_policy_restricted",
       explanation: "Target agent requires approval before task assignment.",
     }));
+    decide.mockImplementation(async (input: { action: string }) => ({
+      allowed: input.action === "issue:mutate",
+      action: input.action,
+      reason: input.action === "issue:mutate" ? "allow_self" : "deny_policy_restricted",
+      explanation:
+        input.action === "issue:mutate"
+          ? "Allowed because the actor owns the assigned issue."
+          : "Target agent requires approval before task assignment.",
+    }));
     (mockAccessService as any).decide = decide;
     mockIssueService.getById.mockResolvedValue(makeIssue({ assigneeAgentId: ownerAgentId }));
     mockAgentService.resolveByReference.mockResolvedValue({
diff --git a/server/src/__tests__/source-trust.test.ts b/server/src/__tests__/source-trust.test.ts
index 297e0a5754c..463380c0965 100644
--- a/server/src/__tests__/source-trust.test.ts
+++ b/server/src/__tests__/source-trust.test.ts
@@ -1,12 +1,23 @@
-import { describe, expect, it } from "vitest";
+import { randomUUID } from "node:crypto";
+import { eq } from "drizzle-orm";
+import { afterAll, afterEach, beforeAll, describe, expect, it } from "vitest";
+import { agents, companies, createDb, heartbeatRuns, issues } from "@paperclipai/db";
 import { LOW_TRUST_REVIEW_PRESET } from "@paperclipai/shared";
 import {
   LOW_TRUST_QUARANTINED_BODY,
   buildPromotedSourceTrust,
   isLowTrustQuarantined,
   redactQuarantinedBodyForHigherTrust,
+  resolveActorSourceTrustForIssue,
   sanitizeQuarantinedCommentForHigherTrust,
 } from "../services/source-trust.js";
+import {
+  getEmbeddedPostgresTestSupport,
+  startEmbeddedPostgresTestDatabase,
+} from "./helpers/embedded-postgres.js";
+
+const embeddedPostgresSupport = await getEmbeddedPostgresTestSupport();
+const describeEmbeddedPostgres = embeddedPostgresSupport.supported ? describe : describe.skip;
 
 const quarantinedSourceTrust = {
   preset: LOW_TRUST_REVIEW_PRESET,
@@ -79,3 +90,166 @@ describe("source trust quarantine helpers", () => {
     expect(isLowTrustQuarantined(promoted)).toBe(false);
   });
 });
+
+describeEmbeddedPostgres("resolveActorSourceTrustForIssue", () => {
+  let db!: ReturnType<typeof createDb>;
+  let tempDb: Awaited<ReturnType<typeof startEmbeddedPostgresTestDatabase>> | null = null;
+
+  beforeAll(async () => {
+    tempDb = await startEmbeddedPostgresTestDatabase("paperclip-source-trust-");
+    db = createDb(tempDb.connectionString);
+  }, 20_000);
+
+  afterEach(async () => {
+    await db.delete(heartbeatRuns);
+    await db.delete(issues);
+    await db.delete(agents);
+    await db.delete(companies);
+  });
+
+  afterAll(async () => {
+    await tempDb?.cleanup();
+  });
+
+  async function createCompany() {
+    return db
+      .insert(companies)
+      .values({
+        name: `Source trust ${randomUUID()}`,
+        issuePrefix: `ST${randomUUID().slice(0, 6).toUpperCase()}`,
+      })
+      .returning()
+      .then((rows) => rows[0]!);
+  }
+
+  async function createAgent(companyId: string) {
+    return db
+      .insert(agents)
+      .values({
+        companyId,
+        name: `Agent ${randomUUID()}`,
+        role: "engineer",
+        adapterType: "process",
+        adapterConfig: {},
+        runtimeConfig: {},
+        permissions: {},
+      })
+      .returning()
+      .then((rows) => rows[0]!);
+  }
+
+  function lowTrustExecutionPolicy(companyId: string, rootIssueId: string) {
+    return {
+      authorizationPolicy: {
+        trustBoundary: {
+          mode: LOW_TRUST_REVIEW_PRESET,
+          companyId,
+          rootIssueId,
+        },
+      },
+    };
+  }
+
+  it("uses the heartbeat run execution-policy snapshot after live issue policy changes", async () => {
+    const company = await createCompany();
+    const agent = await createAgent(company.id);
+    const [issue] = await db
+      .insert(issues)
+      .values({
+        companyId: company.id,
+        title: "Run-scoped low-trust issue",
+        status: "in_progress",
+        priority: "high",
+        assigneeAgentId: agent.id,
+      })
+      .returning();
+    const executionPolicy = lowTrustExecutionPolicy(company.id, issue!.id);
+    const [run] = await db
+      .insert(heartbeatRuns)
+      .values({
+        companyId: company.id,
+        agentId: agent.id,
+        status: "running",
+        contextSnapshot: {
+          issueId: issue!.id,
+          executionPolicy,
+        },
+      })
+      .returning();
+
+    await db.update(issues).set({ executionPolicy: null }).where(eq(issues.id, issue!.id));
+
+    const sourceTrust = await resolveActorSourceTrustForIssue({
+      db,
+      issue: {
+        id: issue!.id,
+        companyId: company.id,
+        projectId: null,
+        executionPolicy: null,
+      },
+      actor: {
+        actorType: "agent",
+        actorId: agent.id,
+        agentId: agent.id,
+        runId: run!.id,
+      },
+    });
+
+    expect(sourceTrust).toMatchObject({
+      preset: LOW_TRUST_REVIEW_PRESET,
+      disposition: "quarantined",
+      sourceIssueId: issue!.id,
+      sourceRunId: run!.id,
+      sourceAgentId: agent.id,
+    });
+  });
+
+  it("fails closed when the supplied run id does not belong to the acting agent", async () => {
+    const company = await createCompany();
+    const actorAgent = await createAgent(company.id);
+    const runOwnerAgent = await createAgent(company.id);
+    const [issue] = await db
+      .insert(issues)
+      .values({
+        companyId: company.id,
+        title: "Standard issue",
+        status: "in_progress",
+        priority: "high",
+        assigneeAgentId: actorAgent.id,
+      })
+      .returning();
+    const [run] = await db
+      .insert(heartbeatRuns)
+      .values({
+        companyId: company.id,
+        agentId: runOwnerAgent.id,
+        status: "running",
+        contextSnapshot: { issueId: issue!.id },
+      })
+      .returning();
+
+    const sourceTrust = await resolveActorSourceTrustForIssue({
+      db,
+      issue: {
+        id: issue!.id,
+        companyId: company.id,
+        projectId: null,
+        executionPolicy: null,
+      },
+      actor: {
+        actorType: "agent",
+        actorId: actorAgent.id,
+        agentId: actorAgent.id,
+        runId: run!.id,
+      },
+    });
+
+    expect(sourceTrust).toMatchObject({
+      preset: LOW_TRUST_REVIEW_PRESET,
+      disposition: "quarantined",
+      sourceIssueId: issue!.id,
+      sourceRunId: run!.id,
+      sourceAgentId: actorAgent.id,
+    });
+  });
+});
diff --git a/server/src/routes/issues.ts b/server/src/routes/issues.ts
index 6621a096c5f..c2f24e0f179 100644
--- a/server/src/routes/issues.ts
+++ b/server/src/routes/issues.ts
@@ -3578,6 +3578,9 @@ export function issueRoutes(
       return;
     }
     assertCompanyAccess(req, issue.companyId);
+    if (!(await assertIssueReadAllowed(req, res, issue))) return;
+    if (!(await assertAgentIssueMutationAllowed(req, res, issue))) return;
+    if (!(await assertDeliverableMutationAllowedByRunContext(req, res, issue))) return;
     const actor = getActorInfo(req);
     if (await sourceTrustForActorWrite(issue, actor)) {
       res.status(403).json({ error: "Low-trust actors cannot promote quarantined output" });
diff --git a/server/src/services/source-trust.ts b/server/src/services/source-trust.ts
index 7b802816fda..b76007e45e6 100644
--- a/server/src/services/source-trust.ts
+++ b/server/src/services/source-trust.ts
@@ -69,6 +69,12 @@ export function buildLowTrustSourceTrust(input: {
   };
 }
 
+function readObject(value: unknown): Record<string, unknown> | null {
+  return typeof value === "object" && value !== null && !Array.isArray(value)
+    ? value as Record<string, unknown>
+    : null;
+}
+
 export function buildPromotedSourceTrust(input: {
   sourceIssueId: string;
   sourceArtifactKind: "comment" | "document" | "work_product" | "issue";
@@ -122,6 +128,8 @@ export async function resolveActorSourceTrustForIssue(input: {
       ? input.db
           .select({
             companyId: heartbeatRuns.companyId,
+            agentId: heartbeatRuns.agentId,
+            contextSnapshot: heartbeatRuns.contextSnapshot,
           })
           .from(heartbeatRuns)
           .where(and(eq(heartbeatRuns.id, input.actor.runId), eq(heartbeatRuns.companyId, input.issue.companyId)))
@@ -129,6 +137,17 @@ export async function resolveActorSourceTrustForIssue(input: {
       : Promise.resolve(null),
   ]);
 
+  if (input.actor.runId && (!run || run.agentId !== input.actor.agentId)) {
+    return buildLowTrustSourceTrust({
+      issueId: input.issue.id,
+      runId: input.actor.runId,
+      agentId: input.actor.agentId,
+    });
+  }
+
+  const runContext = readObject(run?.contextSnapshot);
+  const runExecutionPolicy = readObject(runContext?.executionPolicy);
+
   const resolution = resolveCoreTrustPreset({
     companyId: input.issue.companyId,
     agent,
@@ -137,7 +156,12 @@ export async function resolveActorSourceTrustForIssue(input: {
       companyId: input.issue.companyId,
       executionPolicy: input.issue.executionPolicy,
     },
-    run,
+    run: run
+      ? {
+          companyId: run.companyId,
+          executionPolicy: runExecutionPolicy,
+        }
+      : null,
   });
 
   if (resolution.kind !== "low_trust_review") return null;