diff --git a/scripts/lib/verifier-fixture.d.mts b/scripts/lib/verifier-fixture.d.mts
index ba77339aa2..3f93624056 100644
--- a/scripts/lib/verifier-fixture.d.mts
+++ b/scripts/lib/verifier-fixture.d.mts
@@ -4,6 +4,12 @@ export interface VerifierFixtureRoot {
   close(): Promise<void>;
 }
 
+/** A directory the verifier keeps after the run; nothing removes it. */
+export interface VerifierArtifactDirectory {
+  readonly path: string;
+  readonly kept: true;
+}
+
 /**
  * One verifier fixture root and every cleanup that must confirm before the
  * root may be removed. A failed cleanup retains the root and names it.
@@ -19,6 +25,15 @@ export class VerifierFixture {
     readonly parent?: string;
     readonly private?: boolean;
   }): Promise<VerifierFixture>;
+  /**
+   * Allocate a directory a verifier keeps for its artifacts (receipts,
+   * transcripts, profiles, Evidence). It is never removed; allocation names
+   * it on stderr.
+   */
+  static keepArtifacts(options?: {
+    readonly prefix?: string;
+    readonly parent?: string;
+  }): Promise<VerifierArtifactDirectory>;
   readonly path: string;
   readonly released: boolean;
   /** Register a cleanup that must confirm before the root may be removed. */
diff --git a/scripts/lib/verifier-fixture.mjs b/scripts/lib/verifier-fixture.mjs
index ed8f926d04..4bc9734e65 100644
--- a/scripts/lib/verifier-fixture.mjs
+++ b/scripts/lib/verifier-fixture.mjs
@@ -58,6 +58,21 @@ export class VerifierFixture {
     );
   }
 
+  /**
+   * Allocate a directory a verifier keeps for the artifacts a reviewer reads
+   * after the run: receipts, transcripts, client profiles and Evidence. It is
+   * never removed. Allocation names it on stderr, so a run that fails before
+   * writing its receipt still reports where its artifacts are.
+   */
+  static async keepArtifacts({ prefix, parent } = {}) {
+    const { path } = await createCanonicalTemporaryDirectory(
+      prefix ?? "rea-verifier-artifacts-",
+      ...(parent === undefined ? [] : [parent]),
+    );
+    process.stderr.write(`Keeping verifier artifacts at ${path}\n`);
+    return Object.freeze({ path, kept: true });
+  }
+
   get path() {
     return this.#root.path;
   }
diff --git a/scripts/verify-claude-client.mjs b/scripts/verify-claude-client.mjs
index e5ba1199b8..0ea9219b11 100644
--- a/scripts/verify-claude-client.mjs
+++ b/scripts/verify-claude-client.mjs
@@ -1,7 +1,6 @@
 import assert from "node:assert/strict";
 import { createHash } from "node:crypto";
-import { mkdir, mkdtemp, readFile, writeFile } from "node:fs/promises";
-import { tmpdir } from "node:os";
+import { mkdir, readFile, writeFile } from "node:fs/promises";
 import { isAbsolute, join } from "node:path";
 import { fileURLToPath } from "node:url";
 import Ajv2020 from "ajv/dist/2020.js";
@@ -36,6 +35,7 @@ import {
 } from "./verify/clients/result-discovery.mjs";
 import { createVerifierRun, completeVerifierRun } from "./lib/verifier-run.mjs";
 import { createAnthropicModelFixture } from "./verify/clients/anthropic-model-fixture.mjs";
+import { VerifierFixture } from "./lib/verifier-fixture.mjs";
 
 const repo = fileURLToPath(new URL("..", import.meta.url));
 const runtimeRoot = process.env.REA_VERIFY_RUNTIME_ROOT ?? repo;
@@ -46,7 +46,9 @@ assert(
   "Usage: verify-claude-client.mjs [chat|call]",
 );
 const verifier = createVerifierRun();
-const lab = await mkdtemp(join(tmpdir(), "rea-claude-client-"));
+const { path: lab } = await VerifierFixture.keepArtifacts({
+  prefix: "rea-claude-client-",
+});
 const profile = join(lab, "selected profile");
 const workspace = join(lab, "workspace");
 const configPath = join(profile, ".claude.json");
diff --git a/scripts/verify-cline-client.mjs b/scripts/verify-cline-client.mjs
index a2e830d972..712d769709 100644
--- a/scripts/verify-cline-client.mjs
+++ b/scripts/verify-cline-client.mjs
@@ -1,7 +1,6 @@
 import assert from "node:assert/strict";
 import { Client } from "@modelcontextprotocol/client";
-import { mkdir, mkdtemp, readFile } from "node:fs/promises";
-import { tmpdir } from "node:os";
+import { mkdir, readFile } from "node:fs/promises";
 import { join } from "node:path";
 import { fileURLToPath } from "node:url";
 
@@ -10,13 +9,16 @@ import { createVerifierCommands } from "./lib/verify-commands.mjs";
 import { createVerifierMcpOwner } from "./lib/verifier-mcp-owner.mjs";
 import { withVerifierCleanup } from "./lib/verifier-cleanup.mjs";
 import { completeVerifierRun, createVerifierRun } from "./lib/verifier-run.mjs";
+import { VerifierFixture } from "./lib/verifier-fixture.mjs";
 
 /** Verify default-path CLI registration, client parsing and owned MCP discovery. */
 const repo = fileURLToPath(new URL("..", import.meta.url));
 const command = process.env.REA_VERIFY_CLINE_COMMAND ?? "cline";
 const reaEntry = join(repo, "scripts/rea.mjs");
 const run = createVerifierRun();
-const lab = await mkdtemp(join(tmpdir(), "rea-cline-client-"));
+const { path: lab } = await VerifierFixture.keepArtifacts({
+  prefix: "rea-cline-client-",
+});
 const home = join(lab, "home");
 await mkdir(home, { recursive: true });
 const dataDirectory = join(home, ".cline", "data");
diff --git a/scripts/verify-commandcode-client.mjs b/scripts/verify-commandcode-client.mjs
index 70d6f5f565..049a813f1b 100644
--- a/scripts/verify-commandcode-client.mjs
+++ b/scripts/verify-commandcode-client.mjs
@@ -1,6 +1,6 @@
 import assert from "node:assert/strict";
 import { createHash } from "node:crypto";
-import { mkdir, mkdtemp, readFile, writeFile } from "node:fs/promises";
+import { mkdir, readFile, writeFile } from "node:fs/promises";
 import { homedir } from "node:os";
 import { isAbsolute, join, relative } from "node:path";
 import { fileURLToPath } from "node:url";
@@ -16,6 +16,7 @@ import {
 } from "./verify/clients/javascript-fixture.mjs";
 import { createVerifierRun, completeVerifierRun } from "./lib/verifier-run.mjs";
 import { createOpenAiModelFixture } from "./verify/clients/model-fixture.mjs";
+import { VerifierFixture } from "./lib/verifier-fixture.mjs";
 
 assert(
   process.platform !== "win32",
@@ -39,7 +40,10 @@ assert(
   "Usage: verify-commandcode-client.mjs [chat|call]",
 );
 const verifier = createVerifierRun();
-const lab = await mkdtemp(join(account, "rea-commandcode-client-"));
+const { path: lab } = await VerifierFixture.keepArtifacts({
+  prefix: "rea-commandcode-client-",
+  parent: account,
+});
 const workspace = join(lab, "workspace");
 const target = join(workspace, "fixture α测试");
 const profile = join(account, ".commandcode");
diff --git a/scripts/verify-copilot-client.mjs b/scripts/verify-copilot-client.mjs
index 3f61f89d2a..acdf667085 100644
--- a/scripts/verify-copilot-client.mjs
+++ b/scripts/verify-copilot-client.mjs
@@ -1,7 +1,6 @@
 import assert from "node:assert/strict";
 import { createHash } from "node:crypto";
-import { mkdir, mkdtemp, readFile, writeFile } from "node:fs/promises";
-import { tmpdir } from "node:os";
+import { mkdir, readFile, writeFile } from "node:fs/promises";
 import { basename, isAbsolute, join } from "node:path";
 import { fileURLToPath } from "node:url";
 import Ajv2020 from "ajv/dist/2020.js";
@@ -26,6 +25,7 @@ import {
 } from "./verify/clients/result-discovery.mjs";
 import { createVerifierRun, completeVerifierRun } from "./lib/verifier-run.mjs";
 import { createOpenAiModelFixture } from "./verify/clients/model-fixture.mjs";
+import { VerifierFixture } from "./lib/verifier-fixture.mjs";
 
 assert(
   process.platform !== "win32",
@@ -48,7 +48,9 @@ assert(
   "Usage: verify-copilot-client.mjs [chat|call]",
 );
 const verifier = createVerifierRun();
-const lab = await mkdtemp(join(tmpdir(), "rea-copilot-client-"));
+const { path: lab } = await VerifierFixture.keepArtifacts({
+  prefix: "rea-copilot-client-",
+});
 const account = join(lab, "account");
 const profile = join(lab, "selected profile");
 const workspace = join(lab, "workspace");
diff --git a/scripts/verify-deepseek-client.mjs b/scripts/verify-deepseek-client.mjs
index 1d960a0ec0..6be7f7e053 100644
--- a/scripts/verify-deepseek-client.mjs
+++ b/scripts/verify-deepseek-client.mjs
@@ -1,7 +1,6 @@
 import assert from "node:assert/strict";
 import { createHash } from "node:crypto";
-import { mkdir, mkdtemp, readFile, writeFile } from "node:fs/promises";
-import { tmpdir } from "node:os";
+import { mkdir, readFile, writeFile } from "node:fs/promises";
 import { dirname, join } from "node:path";
 import { fileURLToPath } from "node:url";
 import { Ajv2020 } from "ajv/dist/2020.js";
@@ -22,6 +21,7 @@ import {
 import { createVerifierRun, completeVerifierRun } from "./lib/verifier-run.mjs";
 import { importVerifierSource } from "./lib/verifier-source-loader.mjs";
 import { createOpenAiModelFixture } from "./verify/clients/model-fixture.mjs";
+import { VerifierFixture } from "./lib/verifier-fixture.mjs";
 
 const mode = process.argv[2] ?? "call";
 assert(["chat", "call"].includes(mode), "Select chat or call.");
@@ -34,7 +34,9 @@ const { assertClientSchemaPatterns } = await importVerifierSource(
 const repo = fileURLToPath(new URL("..", import.meta.url));
 const runtimeRoot = process.env.REA_VERIFY_RUNTIME_ROOT ?? repo;
 const command = process.env.REA_VERIFY_DEEPSEEK_COMMAND ?? "dsh";
-const lab = await mkdtemp(join(tmpdir(), "rea-deepseek-client-"));
+const { path: lab } = await VerifierFixture.keepArtifacts({
+  prefix: "rea-deepseek-client-",
+});
 const account = join(lab, "account");
 const profile = join(lab, "selected profile");
 const workspace = join(lab, "workspace");
diff --git a/scripts/verify-gemini-client.mjs b/scripts/verify-gemini-client.mjs
index eab017d6b4..b90ceabbb1 100644
--- a/scripts/verify-gemini-client.mjs
+++ b/scripts/verify-gemini-client.mjs
@@ -1,7 +1,6 @@
 import assert from "node:assert/strict";
 import { createHash } from "node:crypto";
-import { mkdir, mkdtemp, readFile, writeFile } from "node:fs/promises";
-import { tmpdir } from "node:os";
+import { mkdir, readFile, writeFile } from "node:fs/promises";
 import { isAbsolute, join, relative, resolve } from "node:path";
 import { fileURLToPath } from "node:url";
 import Ajv2020 from "ajv/dist/2020.js";
@@ -24,6 +23,7 @@ import {
 import { createVerifierRun, completeVerifierRun } from "./lib/verifier-run.mjs";
 import { createGeminiModelFixture } from "./verify/clients/gemini-model-fixture.mjs";
 import { importVerifierSource } from "./lib/verifier-source-loader.mjs";
+import { VerifierFixture } from "./lib/verifier-fixture.mjs";
 
 const { geminiUnsupportedLiteral } = await importVerifierSource(
   new URL("./lib/gemini-schema-literals.mts", import.meta.url).href,
@@ -49,7 +49,9 @@ assert(
   "Usage: verify-gemini-client.mjs [chat|call]",
 );
 const verifier = createVerifierRun();
-const lab = await mkdtemp(join(tmpdir(), "rea-gemini-client-"));
+const { path: lab } = await VerifierFixture.keepArtifacts({
+  prefix: "rea-gemini-client-",
+});
 const account = join(lab, "account");
 const profile = join(lab, "selected profile");
 const workspace = join(lab, "workspace");
diff --git a/scripts/verify-grok-client.mjs b/scripts/verify-grok-client.mjs
index 0ea587e45f..75dbcc6933 100644
--- a/scripts/verify-grok-client.mjs
+++ b/scripts/verify-grok-client.mjs
@@ -1,7 +1,7 @@
 import assert from "node:assert/strict";
 import { createHash } from "node:crypto";
-import { mkdir, mkdtemp, readFile, writeFile } from "node:fs/promises";
-import { homedir, tmpdir } from "node:os";
+import { mkdir, readFile, writeFile } from "node:fs/promises";
+import { homedir } from "node:os";
 import { isAbsolute, join, relative } from "node:path";
 import { fileURLToPath } from "node:url";
 import Ajv2020 from "ajv/dist/2020.js";
@@ -16,6 +16,7 @@ import {
 } from "./verify/clients/javascript-fixture.mjs";
 import { createVerifierRun, completeVerifierRun } from "./lib/verifier-run.mjs";
 import { createOpenAiModelFixture } from "./verify/clients/model-fixture.mjs";
+import { VerifierFixture } from "./lib/verifier-fixture.mjs";
 
 assert(
   process.platform !== "win32",
@@ -30,7 +31,9 @@ assert(
   "Usage: verify-grok-client.mjs [chat|call]",
 );
 const verifier = createVerifierRun();
-const lab = await mkdtemp(join(tmpdir(), "rea-grok-client-"));
+const { path: lab } = await VerifierFixture.keepArtifacts({
+  prefix: "rea-grok-client-",
+});
 const account = join(lab, "account");
 const profile = join(lab, "selected profile");
 const workspace = join(lab, "workspace");
diff --git a/scripts/verify-native-agent-client.mjs b/scripts/verify-native-agent-client.mjs
index bed1f8b41f..63dd71fa48 100644
--- a/scripts/verify-native-agent-client.mjs
+++ b/scripts/verify-native-agent-client.mjs
@@ -1,7 +1,6 @@
 import assert from "node:assert/strict";
 import { createHash } from "node:crypto";
-import { mkdir, mkdtemp, readFile, writeFile } from "node:fs/promises";
-import { tmpdir } from "node:os";
+import { mkdir, readFile, writeFile } from "node:fs/promises";
 import { join } from "node:path";
 import { fileURLToPath } from "node:url";
 import { TOOL_CONTRACTS } from "../dist/contracts/toolContracts.js";
@@ -18,6 +17,7 @@ import {
 } from "./verify/clients/result-discovery.mjs";
 import { createVerifierRun, completeVerifierRun } from "./lib/verifier-run.mjs";
 import { createOpenAiModelFixture } from "./verify/clients/model-fixture.mjs";
+import { VerifierFixture } from "./lib/verifier-fixture.mjs";
 
 const client = process.argv[2];
 const mode = process.argv[3] ?? "call";
@@ -31,7 +31,9 @@ const repo = fileURLToPath(new URL("..", import.meta.url));
 const runtimeRoot = process.env.REA_VERIFY_RUNTIME_ROOT ?? repo;
 const command =
   process.env[`REA_VERIFY_${client.toUpperCase()}_COMMAND`] ?? client;
-const lab = await mkdtemp(join(tmpdir(), `rea-${client}-client-`));
+const { path: lab } = await VerifierFixture.keepArtifacts({
+  prefix: `rea-${client}-client-`,
+});
 const account = join(lab, "account");
 const profile = join(lab, "selected profile");
 const stickyHermes =
diff --git a/scripts/verify-omp-client.mjs b/scripts/verify-omp-client.mjs
index 0cd3d0227b..19a45c693c 100644
--- a/scripts/verify-omp-client.mjs
+++ b/scripts/verify-omp-client.mjs
@@ -1,7 +1,7 @@
 import assert from "node:assert/strict";
 import { createHash } from "node:crypto";
-import { mkdir, mkdtemp, readFile, writeFile } from "node:fs/promises";
-import { homedir, tmpdir } from "node:os";
+import { mkdir, readFile, writeFile } from "node:fs/promises";
+import { homedir } from "node:os";
 import { isAbsolute, join, relative } from "node:path";
 import { fileURLToPath } from "node:url";
 import { TOOL_CONTRACTS } from "../dist/contracts/toolContracts.js";
@@ -15,6 +15,7 @@ import {
 } from "./verify/clients/javascript-fixture.mjs";
 import { createVerifierRun, completeVerifierRun } from "./lib/verifier-run.mjs";
 import { createOpenAiModelFixture } from "./verify/clients/model-fixture.mjs";
+import { VerifierFixture } from "./lib/verifier-fixture.mjs";
 
 assert(
   process.platform !== "win32",
@@ -29,7 +30,9 @@ assert(
   "Usage: verify-omp-client.mjs [chat|call]",
 );
 const verifier = createVerifierRun();
-const lab = await mkdtemp(join(tmpdir(), "rea-omp-client-"));
+const { path: lab } = await VerifierFixture.keepArtifacts({
+  prefix: "rea-omp-client-",
+});
 const account = join(lab, "account");
 const agent = join(lab, "selected agent");
 const workspace = join(lab, "workspace");
diff --git a/scripts/verify-opencode-client.mjs b/scripts/verify-opencode-client.mjs
index 8877b4664d..6b87fdbe11 100644
--- a/scripts/verify-opencode-client.mjs
+++ b/scripts/verify-opencode-client.mjs
@@ -1,7 +1,6 @@
 import assert from "node:assert/strict";
 import { createHash } from "node:crypto";
-import { mkdir, mkdtemp, readFile, writeFile } from "node:fs/promises";
-import { tmpdir } from "node:os";
+import { mkdir, readFile, writeFile } from "node:fs/promises";
 import { isAbsolute, join } from "node:path";
 import { fileURLToPath } from "node:url";
 import Ajv2020 from "ajv/dist/2020.js";
@@ -20,6 +19,7 @@ import {
 } from "./verify/clients/result-discovery.mjs";
 import { createVerifierRun, completeVerifierRun } from "./lib/verifier-run.mjs";
 import { createOpenAiModelFixture } from "./verify/clients/model-fixture.mjs";
+import { VerifierFixture } from "./lib/verifier-fixture.mjs";
 
 assert(
   process.platform !== "win32",
@@ -39,7 +39,9 @@ assert(
   "REA_VERIFY_OPENCODE_CONFIG_FORMAT must be json or jsonc",
 );
 const verifier = createVerifierRun();
-const lab = await mkdtemp(join(tmpdir(), "rea-opencode-client-"));
+const { path: lab } = await VerifierFixture.keepArtifacts({
+  prefix: "rea-opencode-client-",
+});
 const account = join(lab, "account");
 const profile = join(lab, "selected profile");
 const workspace = join(lab, "workspace");
diff --git a/scripts/verify-qwen-client.mjs b/scripts/verify-qwen-client.mjs
index 58fd63c3d6..c67005a024 100644
--- a/scripts/verify-qwen-client.mjs
+++ b/scripts/verify-qwen-client.mjs
@@ -4,11 +4,9 @@ import {
   mkdir,
   writeFile,
   readFile,
-  mkdtemp,
   realpath,
   symlink,
 } from "node:fs/promises";
-import { tmpdir } from "node:os";
 import { isAbsolute, join, relative, resolve, sep } from "node:path";
 import { fileURLToPath } from "node:url";
 import { createHash } from "node:crypto";
@@ -26,10 +24,13 @@ import {
 } from "./verify/clients/result-discovery.mjs";
 import { createVerifierRun, completeVerifierRun } from "./lib/verifier-run.mjs";
 import { TOOL_CONTRACTS } from "../dist/contracts/toolContracts.js";
+import { VerifierFixture } from "./lib/verifier-fixture.mjs";
 
 const repo = fileURLToPath(new URL("..", import.meta.url));
 const runtimeRoot = process.env.REA_VERIFY_RUNTIME_ROOT ?? repo;
-const lab = await mkdtemp(join(tmpdir(), "rea-qwen-client-"));
+const { path: lab } = await VerifierFixture.keepArtifacts({
+  prefix: "rea-qwen-client-",
+});
 const client = "qwen";
 const mode = process.argv[2] ?? "call";
 assert(
diff --git a/scripts/verify/architecture-guard-baselines.json b/scripts/verify/architecture-guard-baselines.json
index 2e4f7b144f..d6f2ce29da 100644
--- a/scripts/verify/architecture-guard-baselines.json
+++ b/scripts/verify/architecture-guard-baselines.json
@@ -412,29 +412,19 @@
     "scripts/verify-binary-layout.mjs": 1,
     "scripts/verify-browser-dom-destinations.mjs": 1,
     "scripts/verify-bun-standalone.mjs": 1,
-    "scripts/verify-claude-client.mjs": 1,
-    "scripts/verify-cline-client.mjs": 1,
-    "scripts/verify-commandcode-client.mjs": 1,
-    "scripts/verify-copilot-client.mjs": 1,
-    "scripts/verify-deepseek-client.mjs": 1,
     "scripts/verify-deno-standalone.mjs": 1,
     "scripts/verify-elf-unwind-ranges.mjs": 1,
     "scripts/verify-evm-interface.mjs": 1,
     "scripts/verify-flutter.mjs": 1,
-    "scripts/verify-gemini-client.mjs": 1,
     "scripts/verify-ghidra-bridge-sources.mjs": 1,
     "scripts/verify-ghidra-loader-relocation.mjs": 1,
     "scripts/verify-go-binary.mjs": 1,
-    "scripts/verify-grok-client.mjs": 1,
     "scripts/verify-jeb.mjs": 1,
     "scripts/verify-linux-setup-e2e.mjs": 1,
-    "scripts/verify-native-agent-client.mjs": 1,
     "scripts/verify-native-calls.mjs": 1,
     "scripts/verify-native-pascal-calls.mjs": 1,
     "scripts/verify-native-ui.mjs": 1,
     "scripts/verify-node-sea.mjs": 1,
-    "scripts/verify-omp-client.mjs": 1,
-    "scripts/verify-opencode-client.mjs": 1,
     "scripts/verify-package.mjs": 1,
     "scripts/verify-packaged-ghidra-windows.mjs": 1,
     "scripts/verify-packaged-wasm-artifact.mjs": 1,
@@ -442,7 +432,6 @@
     "scripts/verify-pcap.mjs": 1,
     "scripts/verify-pe-load-config.mjs": 1,
     "scripts/verify-published-package.mjs": 1,
-    "scripts/verify-qwen-client.mjs": 1,
     "scripts/verify-real-cutter.mjs": 1,
     "scripts/verify-real-ghidra-address-context.mjs": 1,
     "scripts/verify-real-ghidra-checkpoints.mjs": 1,
diff --git a/tests/process-global/verifierFixture.test.ts b/tests/process-global/verifierFixture.test.ts
index c80dd96a87..ab2b3ff626 100644
--- a/tests/process-global/verifierFixture.test.ts
+++ b/tests/process-global/verifierFixture.test.ts
@@ -219,3 +219,31 @@ it("keeps a retained root across every release and names why", async () => {
   expect(closes).toBe(0);
   expect(fixture.released).toBe(false);
 });
+
+it("keeps an artifact directory, owned by the verifier and named on stderr", async () => {
+  const parent = await VerifierFixture.open({ prefix: "rea-fixture-test-" });
+  const written: string[] = [];
+  const write = process.stderr.write.bind(process.stderr);
+  process.stderr.write = ((chunk: string) => {
+    written.push(String(chunk));
+    return true;
+  }) as typeof process.stderr.write;
+  try {
+    const artifacts = await VerifierFixture.keepArtifacts({
+      prefix: "rea-client-",
+      parent: parent.path,
+    });
+    expect(artifacts.kept).toBe(true);
+    expect(artifacts.path.startsWith(join(parent.path, "rea-client-"))).toBe(
+      true,
+    );
+    expect((await stat(artifacts.path)).mode & 0o077).toBe(0);
+    expect(Object.isFrozen(artifacts)).toBe(true);
+    expect(written).toEqual([
+      `Keeping verifier artifacts at ${artifacts.path}\n`,
+    ]);
+  } finally {
+    process.stderr.write = write;
+    await parent.release();
+  }
+});