diff --git a/packages/paperclip-runner/src/contracts/completion-result.test.ts b/packages/paperclip-runner/src/contracts/completion-result.test.ts
index 065b68c0be3..78161a7cdf1 100644
--- a/packages/paperclip-runner/src/contracts/completion-result.test.ts
+++ b/packages/paperclip-runner/src/contracts/completion-result.test.ts
@@ -1,12 +1,13 @@
+// Explicit historical oracle for the matched native-guidance baseline.
+const PRP_COMPLETION_TOOL_DESCRIPTION = "Return the one semantic completion result for this task, including an explicit response_wake yield when waiting for the next response.";
+const PRP_BLOCK_TOOL_DESCRIPTION = "Return the one semantic result when the task cannot continue.";
 import Ajv2020 from "ajv/dist/2020.js";
 import { describe, expect, it } from "vitest";
 import {
   PRP_BLOCK_RESULT_OUTPUT_SCHEMA,
   PRP_BLOCK_RESULT_PROVIDER_INPUT_SCHEMA,
-  PRP_BLOCK_TOOL_DESCRIPTION,
   PRP_COMPLETION_RESULT_OUTPUT_SCHEMA,
   PRP_COMPLETION_RESULT_PROVIDER_INPUT_SCHEMA,
-  PRP_COMPLETION_TOOL_DESCRIPTION,
 } from "./completion-result.js";
 import { codexSemanticToolSpecs } from "../drivers/codex/codex-driver-values.js";
 
diff --git a/packages/paperclip-runner/src/contracts/completion-result.ts b/packages/paperclip-runner/src/contracts/completion-result.ts
index b727a942965..dec93a2f1de 100644
--- a/packages/paperclip-runner/src/contracts/completion-result.ts
+++ b/packages/paperclip-runner/src/contracts/completion-result.ts
@@ -1,11 +1,6 @@
 /** Provider-neutral semantic completion tools and their strict model-facing schemas. */
 export const PRP_COMPLETION_TOOL_NAME = "paperclip_finish" as const;
 export const PRP_BLOCK_TOOL_NAME = "paperclip_block" as const;
-/** Native Runner guidance; legacy adapters use their own skill/API completion paths. */
-export const PRP_COMPLETION_TOOL_DESCRIPTION =
-  "Report completed work (done), work requiring review (needs_review), or an explicit wait for the next response (yielded with response_wake). Use the current completion contract and supporting evidence. If rejected, correct the report and retry. After acceptance, read the returned outcome; do not claim completion while gated. Explain any required approval with its supplied link and action, then write the final response and end the turn without further tool calls.";
-export const PRP_BLOCK_TOOL_DESCRIPTION =
-  "Report work that cannot continue because of a concrete blocker. Identify the blocker, its owner, and the action needed to unblock it; use the current completion contract and supporting evidence. If rejected, correct the report and retry. After acceptance, read the returned outcome, explain the blocker and any required action in the final response, and end the turn without further tool calls.";
 export const PRP_SEMANTIC_TOOL_NAMES = [
   PRP_COMPLETION_TOOL_NAME,
   PRP_BLOCK_TOOL_NAME,
diff --git a/packages/paperclip-runner/src/drivers/codex/codex-app-server-driver.lifecycle.test.ts b/packages/paperclip-runner/src/drivers/codex/codex-app-server-driver.lifecycle.test.ts
index c5ade4c19c2..96ad6955a2a 100644
--- a/packages/paperclip-runner/src/drivers/codex/codex-app-server-driver.lifecycle.test.ts
+++ b/packages/paperclip-runner/src/drivers/codex/codex-app-server-driver.lifecycle.test.ts
@@ -1,8 +1,9 @@
+// Explicit historical oracle for the matched native-guidance baseline.
+const PRP_COMPLETION_TOOL_DESCRIPTION = "Return the one semantic completion result for this task, including an explicit response_wake yield when waiting for the next response.";
+const PRP_BLOCK_TOOL_DESCRIPTION = "Return the one semantic result when the task cannot continue.";
 import {
   PRP_BLOCK_RESULT_PROVIDER_INPUT_SCHEMA,
-  PRP_BLOCK_TOOL_DESCRIPTION,
   PRP_COMPLETION_RESULT_PROVIDER_INPUT_SCHEMA,
-  PRP_COMPLETION_TOOL_DESCRIPTION,
 } from "../../contracts/completion-result.js";
 import {
   CODEX_BLOCK_RESULT_OUTPUT_SCHEMA,
diff --git a/packages/paperclip-runner/src/drivers/codex/codex-driver-values.ts b/packages/paperclip-runner/src/drivers/codex/codex-driver-values.ts
index 5d4b9c9c7f2..68c32a3c9a6 100644
--- a/packages/paperclip-runner/src/drivers/codex/codex-driver-values.ts
+++ b/packages/paperclip-runner/src/drivers/codex/codex-driver-values.ts
@@ -1,9 +1,5 @@
 import type { PersistedHarnessProviderIdentity } from "../../contracts/harness-driver.js";
 import type { NativeUserMessage } from "../../contracts/types.js";
-import {
-  PRP_BLOCK_TOOL_DESCRIPTION,
-  PRP_COMPLETION_TOOL_DESCRIPTION,
-} from "../../contracts/completion-result.js";
 import {
   CODEX_BLOCK_RESULT_PROVIDER_INPUT_SCHEMA,
   CODEX_BLOCK_TOOL_NAME,
@@ -236,7 +232,8 @@ export function differingJsonPaths(
 function finishToolSpec(): Record<string, unknown> {
   return {
     name: CODEX_COMPLETION_TOOL_NAME,
-    description: PRP_COMPLETION_TOOL_DESCRIPTION,
+    description:
+      "Return the one semantic completion result for this task, including an explicit response_wake yield when waiting for the next response.",
     inputSchema: CODEX_RESULT_PROVIDER_INPUT_SCHEMA,
   };
 }
@@ -244,7 +241,8 @@ function finishToolSpec(): Record<string, unknown> {
 function blockToolSpec(): Record<string, unknown> {
   return {
     name: CODEX_BLOCK_TOOL_NAME,
-    description: PRP_BLOCK_TOOL_DESCRIPTION,
+    description:
+      "Return the one semantic result when the task cannot continue.",
     inputSchema: CODEX_BLOCK_RESULT_PROVIDER_INPUT_SCHEMA,
   };
 }
diff --git a/packages/paperclip-runner/src/drivers/opencode/mcp-bridge.test.ts b/packages/paperclip-runner/src/drivers/opencode/mcp-bridge.test.ts
index 07681400ddd..f9468a1f024 100644
--- a/packages/paperclip-runner/src/drivers/opencode/mcp-bridge.test.ts
+++ b/packages/paperclip-runner/src/drivers/opencode/mcp-bridge.test.ts
@@ -1,9 +1,10 @@
+// Explicit historical oracle for the matched native-guidance baseline.
+const PRP_COMPLETION_TOOL_DESCRIPTION = "Return the semantic completion result.";
+const PRP_BLOCK_TOOL_DESCRIPTION = "Return the semantic blocked result.";
 import { afterEach, describe, expect, it, vi } from "vitest";
 import {
   PRP_BLOCK_RESULT_PROVIDER_INPUT_SCHEMA,
-  PRP_BLOCK_TOOL_DESCRIPTION,
   PRP_COMPLETION_RESULT_PROVIDER_INPUT_SCHEMA,
-  PRP_COMPLETION_TOOL_DESCRIPTION,
 } from "../../contracts/completion-result.js";
 
 import { canonicalOpenCodeMcpToolName, startOpenCodeMcpBridge, type OpenCodeMcpBridge } from "./mcp-bridge.js";
diff --git a/packages/paperclip-runner/src/drivers/opencode/mcp-bridge.ts b/packages/paperclip-runner/src/drivers/opencode/mcp-bridge.ts
index 1bf1555dd16..79ce6770375 100644
--- a/packages/paperclip-runner/src/drivers/opencode/mcp-bridge.ts
+++ b/packages/paperclip-runner/src/drivers/opencode/mcp-bridge.ts
@@ -4,10 +4,8 @@ import { Ajv2020, type ValidateFunction } from "ajv/dist/2020.js";
 
 import {
   PRP_BLOCK_RESULT_PROVIDER_INPUT_SCHEMA,
-  PRP_BLOCK_TOOL_DESCRIPTION,
   PRP_BLOCK_TOOL_NAME,
   PRP_COMPLETION_RESULT_PROVIDER_INPUT_SCHEMA,
-  PRP_COMPLETION_TOOL_DESCRIPTION,
   PRP_COMPLETION_TOOL_NAME,
 } from "../../contracts/completion-result.js";
 
@@ -119,8 +117,8 @@ function normalizeTools(
     seen.add(name);
   }
   if (includeTerminalTools) for (const terminal of [
-    { name: PRP_COMPLETION_TOOL_NAME, description: PRP_COMPLETION_TOOL_DESCRIPTION, inputSchema: PRP_COMPLETION_RESULT_PROVIDER_INPUT_SCHEMA },
-    { name: PRP_BLOCK_TOOL_NAME, description: PRP_BLOCK_TOOL_DESCRIPTION, inputSchema: PRP_BLOCK_RESULT_PROVIDER_INPUT_SCHEMA },
+    { name: PRP_COMPLETION_TOOL_NAME, description: "Return the semantic completion result.", inputSchema: PRP_COMPLETION_RESULT_PROVIDER_INPUT_SCHEMA },
+    { name: PRP_BLOCK_TOOL_NAME, description: "Return the semantic blocked result.", inputSchema: PRP_BLOCK_RESULT_PROVIDER_INPUT_SCHEMA },
   ]) {
     if (!seen.has(terminal.name)) tools.push(terminal);
   }
diff --git a/packages/paperclip-runner/src/drivers/runner-tool-bridge.test.ts b/packages/paperclip-runner/src/drivers/runner-tool-bridge.test.ts
index 5bf87169d24..7555a0c6869 100644
--- a/packages/paperclip-runner/src/drivers/runner-tool-bridge.test.ts
+++ b/packages/paperclip-runner/src/drivers/runner-tool-bridge.test.ts
@@ -1,11 +1,12 @@
+// Explicit historical oracle for the matched native-guidance baseline.
+const PRP_COMPLETION_TOOL_DESCRIPTION = "Return the semantic completion result.";
+const PRP_BLOCK_TOOL_DESCRIPTION = "Return the semantic blocked result.";
 import { connect } from "node:net";
 
 import { afterEach, describe, expect, it, vi } from "vitest";
 import {
   PRP_BLOCK_RESULT_PROVIDER_INPUT_SCHEMA,
-  PRP_BLOCK_TOOL_DESCRIPTION,
   PRP_COMPLETION_RESULT_PROVIDER_INPUT_SCHEMA,
-  PRP_COMPLETION_TOOL_DESCRIPTION,
 } from "../contracts/completion-result.js";
 
 import {
diff --git a/packages/paperclip-runner/src/drivers/runner-tool-bridge.ts b/packages/paperclip-runner/src/drivers/runner-tool-bridge.ts
index c8207c71833..e59535171be 100644
--- a/packages/paperclip-runner/src/drivers/runner-tool-bridge.ts
+++ b/packages/paperclip-runner/src/drivers/runner-tool-bridge.ts
@@ -10,10 +10,8 @@ import { Ajv2020, type ValidateFunction } from "ajv/dist/2020.js";
 
 import {
   PRP_BLOCK_RESULT_PROVIDER_INPUT_SCHEMA,
-  PRP_BLOCK_TOOL_DESCRIPTION,
   PRP_BLOCK_TOOL_NAME,
   PRP_COMPLETION_RESULT_PROVIDER_INPUT_SCHEMA,
-  PRP_COMPLETION_TOOL_DESCRIPTION,
   PRP_COMPLETION_TOOL_NAME,
 } from "../contracts/completion-result.js";
 
@@ -72,12 +70,12 @@ const MAX_RESULT_CHUNK_BYTES = 64 * 1024;
 const RESERVED_TOOLS: readonly RunnerToolDefinition[] = [
   {
     name: PRP_COMPLETION_TOOL_NAME,
-    description: PRP_COMPLETION_TOOL_DESCRIPTION,
+    description: "Return the semantic completion result.",
     inputSchema: PRP_COMPLETION_RESULT_PROVIDER_INPUT_SCHEMA,
   },
   {
     name: PRP_BLOCK_TOOL_NAME,
-    description: PRP_BLOCK_TOOL_DESCRIPTION,
+    description: "Return the semantic blocked result.",
     inputSchema: PRP_BLOCK_RESULT_PROVIDER_INPUT_SCHEMA,
   },
 ];
diff --git a/packages/paperclip-runner/src/live/runnerd-codex-transport.test.ts b/packages/paperclip-runner/src/live/runnerd-codex-transport.test.ts
index 50544213ea3..aaede0a82c3 100644
--- a/packages/paperclip-runner/src/live/runnerd-codex-transport.test.ts
+++ b/packages/paperclip-runner/src/live/runnerd-codex-transport.test.ts
@@ -1,3 +1,6 @@
+// Explicit historical oracle for the matched native-guidance baseline.
+const PRP_COMPLETION_TOOL_DESCRIPTION = "Return the one semantic completion result for this task, including an explicit response_wake yield when waiting for the next response.";
+const PRP_BLOCK_TOOL_DESCRIPTION = "Return the one semantic result when the task cannot continue.";
 import {
   chmod,
   cp,
@@ -55,8 +58,6 @@ import {
   createCodexTaskEnvelope,
 } from "../contracts/codex.js";
 import {
-  PRP_BLOCK_TOOL_DESCRIPTION,
-  PRP_COMPLETION_TOOL_DESCRIPTION,
 } from "../contracts/completion-result.js";
 import {
   CodexAppServerDriver,
diff --git a/server/src/services/native-runtime/native-session-resume.test.ts b/server/src/services/native-runtime/native-session-resume.test.ts
index 0247fc8868f..cab88d8ea9b 100644
--- a/server/src/services/native-runtime/native-session-resume.test.ts
+++ b/server/src/services/native-runtime/native-session-resume.test.ts
@@ -1840,12 +1840,6 @@ describe("rebindNativeSessionCheckpoint", () => {
       retainedFingerprint:
         "sha256:5b7b302db36f7ed6686f9ea1ba70bbf79ebd7fabf86953b548d966a2bc38b648",
     },
-    {
-      contract: "native completion tool guidance",
-      // Deployed v13 local catalog before canonical finish/block descriptions.
-      retainedFingerprint:
-        "sha256:68a51d34e091c55ee5d0d2b563153454dd727d72db16e6a27c358d342ae489c9",
-    },
     {
       contract: "task-bound human-input description",
       // Deployed v9 still advertises the generic mock-task question description.
diff --git a/server/src/services/native-runtime/native-session-resume.ts b/server/src/services/native-runtime/native-session-resume.ts
index 7f2ac7ea3f1..f50b6bb0962 100644
--- a/server/src/services/native-runtime/native-session-resume.ts
+++ b/server/src/services/native-runtime/native-session-resume.ts
@@ -23,7 +23,7 @@ export function nativeToolContractFingerprintForTarget(
   return `sha256:${createHash("sha256")
     .update(
       JSON.stringify({
-        schema: "paperclip.native-tool-contract.v14",
+        schema: "paperclip.native-tool-contract.v13",
         executionTargetKind,
         advertisementPolicy: {
           // Direct provider threads retain declarations from thread/start.
diff --git a/tests/runner-e2e/native-completion-comparison.json b/tests/runner-e2e/native-completion-comparison.json
new file mode 100644
index 00000000000..8dd508d1a88
--- /dev/null
+++ b/tests/runner-e2e/native-completion-comparison.json
@@ -0,0 +1,46 @@
+{
+  "schema": "paperclip.native-completion.matched-baseline/v1",
+  "candidateSha": "55ce97b675e1ed68cc171fe44b729147209a7e24",
+  "historicalInstructionSourceSha": "5837aa44425ea134fc33a96c502c22d6a32b6866",
+  "heldConstant": [
+    "merged native Codex base fix #14920",
+    "tiny default hire manual",
+    "reduced shared startup/resume prompts",
+    "all fixtures, models, effort, permissions, auth and behavioral graders"
+  ],
+  "productionSourcesRestored": [
+    "packages/paperclip-runner/src/contracts/completion-result.ts",
+    "packages/paperclip-runner/src/drivers/codex/codex-driver-values.ts",
+    "packages/paperclip-runner/src/drivers/runner-tool-bridge.ts",
+    "packages/paperclip-runner/src/drivers/opencode/mcp-bridge.ts",
+    "server/src/services/native-runtime/native-session-resume.ts"
+  ],
+  "historicalStructuralOracles": "Same authenticated/wire/catalog gates expect the explicit historical descriptions. The v13 baseline does not run the candidate-only v13-to-v14 rotation assertion; its prior compatibility cases remain mandatory. Candidate graders are unchanged.",
+  "behavioralSourceHashes": {
+    "tests/runner-e2e/native-completion-case.ts": "6ecd17a78aad20eea36d5ea0f039f22255ea2e61115e16a5e2b1543c72e9a622",
+    "tests/runner-e2e/native-completion-case.test.ts": "253910919bef2dce5509e4005a635b16c518d4940a870c7bbc100898ce8afe83",
+    "tests/runner-e2e/context-integrity-cases.ts": "201d05f8257c1121a94dd9d8a22f08b9db80555e388013ffeabb65e301499fd2",
+    "tests/runner-e2e/context-integrity-flow.ts": "63bcb7bdba4c80b15ff5872f16383844456eab0c5a10627da5d3487a26821c6a",
+    "tests/runner-e2e/context-integrity-scoring.ts": "50d370044e45386ba87fb23ca63c228b96bb8373d67bb7e82e8b2a89eb23f252",
+    "tests/runner-e2e/matchers.ts": "852dc82ca9b4d5d1b2e902407c1df5ff0343313e71175805b6a444c55ff69957",
+    "tests/runner-e2e/runner.spec.ts": "14d57e0f9131b3f1981ac593464738d01362008eefe85ea836075c794681fa85",
+    "tests/runner-e2e/live-fixtures.ts": "1ef80209cc53cc514a8e58af4c2225e38ec15b20acf17ca7564506ca6617ac3e",
+    "tests/runner-e2e/catalog.ts": "7d6fd220dcac80296ba0c73a0febf9975a9b6f28085359d52ca605b598c40ec7",
+    "tests/runner-e2e/stock-harness.ts": "9ce135aabe82f532eca9f16bfd00689c3279bbacf9f68e247a4332ba8a0d4c3c",
+    "tests/runner-e2e/stock-harness-admission.ts": "4cad5e7e703029651d79b5ace4b22368da3b326fed46fe38366c6f95d24b4451",
+    "tests/runner-e2e/launch.ts": "b020d6fd8a4ae00e008215a49b937bbc65208e66341113a4e548c3d4b492ff4a"
+  },
+  "selection": {
+    "profiles": [
+      "runner-codex",
+      "runner-acpx-claude",
+      "runner-opencode"
+    ],
+    "cases": [
+      "assigned-skill-explicit-invocation",
+      "native-blocked-report"
+    ],
+    "expectedCells": 6,
+    "expectedProviderTurns": 6
+  }
+}
diff --git a/tests/runner-e2e/stock-harness-checks.mjs b/tests/runner-e2e/stock-harness-checks.mjs
index 79997e20fc0..8e874dc7839 100644
--- a/tests/runner-e2e/stock-harness-checks.mjs
+++ b/tests/runner-e2e/stock-harness-checks.mjs
@@ -48,10 +48,10 @@ export const stockHarnessGates = [
     "preserves stock Codex instructions on prepared recovery", "preserves stock Codex instructions on direct recovery",
     ...["codex", "opencode", "claude_managed", "aws_agentcore", "acpx"].map(provider =>
       `preserves answer and internal wait descriptions in the serialized native ${provider} tool catalog`)] },
-  { id: "SH-4-resume", name: "Refresh retained native completion guidance", cwd: ".", files: [
+  { id: "SH-4-resume", name: "Historical native fingerprint and retained-session compatibility", cwd: ".", files: [
     "server/src/services/native-runtime/native-session-resume.test.ts",
   ], testPattern: "refreshes retained",
-  required: ["native completion tool guidance"] },
+  required: ["refreshes retained completion descriptions without changing the Paperclip task or prior history"] },
   { id: "SH-eval", name: "Independent oracle and qualification admission", cwd: ".",
     config: "tests/runner-e2e/vitest.config.ts",
     files: ["tests/runner-e2e/stock-harness.test.ts", "tests/runner-e2e/stock-harness-checks.test.mjs",