diff --git a/COMMANDS.md b/COMMANDS.md
index 99facc6..8401034 100644
--- a/COMMANDS.md
+++ b/COMMANDS.md
@@ -391,6 +391,8 @@ fable-agent plinius godmode "improve explanation quality"
 - `fable5 permission-posture`
   - `--mode <mode>`
   - `--output <path>`
+- `fable5 stale-memory-quarantine`
+  - `--output <path>`
 - `fable5 receipt-health`
   - `--root <path>`
   - `--window-minutes <n>`
diff --git a/src/fable5/index.ts b/src/fable5/index.ts
index c6e2a69..cb2e1a1 100644
--- a/src/fable5/index.ts
+++ b/src/fable5/index.ts
@@ -66,6 +66,9 @@ export type { ExternalToolAuditReceipt, ExternalToolAuditRow, ExternalToolAuditS
 export { createOpenCovenReviewReceipt, createPermissionPostureReceipt, writeExternalProjectReviewReceipt } from "./external-project-review.js";
 export type { ExternalProjectDecision, ExternalProjectReviewReceipt, PermissionMode, PermissionPostureReceipt } from "./external-project-review.js";
 
+export { createFactoryMemoryQuarantineReceipt, createStaleMemoryQuarantineReceipt, writeStaleMemoryQuarantineReceipt } from "./stale-memory-quarantine.js";
+export type { StaleMemoryClaim, StaleMemoryQuarantineReceipt, StaleMemorySeverity } from "./stale-memory-quarantine.js";
+
 export { channelPath, emitChannelEvent, readChannelEvents } from "./channel.js";
 export type { ChannelEvent, ChannelEventSource, ChannelEventType, NewChannelEvent } from "./channel.js";
 
diff --git a/src/fable5/stale-memory-quarantine.test.ts b/src/fable5/stale-memory-quarantine.test.ts
new file mode 100644
index 0000000..c06cd81
--- /dev/null
+++ b/src/fable5/stale-memory-quarantine.test.ts
@@ -0,0 +1,38 @@
+import * as fs from "node:fs";
+import * as os from "node:os";
+import * as path from "node:path";
+import { describe, expect, it } from "vitest";
+import { createFactoryMemoryQuarantineReceipt, createStaleMemoryQuarantineReceipt, writeStaleMemoryQuarantineReceipt } from "./stale-memory-quarantine.js";
+
+describe("stale memory quarantine receipts", () => {
+  it("quarantines dangerous factory memory without deploy authority", () => {
+    const receipt = createFactoryMemoryQuarantineReceipt(new Date("2026-07-01T00:00:00.000Z"));
+
+    expect(receipt).toMatchObject({
+      schema: "fable.stale_memory.quarantine.v1",
+      source: "conversation memory summary",
+      decision: "quarantined",
+      deployAttempted: false,
+    });
+    expect(receipt.claims.map((claim) => claim.claim)).toContain("8098/deploy-webhook is trusted deploy path");
+    expect(receipt.claims.some((claim) => claim.severity === "dangerous")).toBe(true);
+    expect(receipt.blockedTrustPaths).toContain("8098/deploy-webhook");
+    expect(receipt.canonicalTrustPaths).toContain("8099/deploy via git-proxy");
+  });
+
+  it("marks empty claim sets ready", () => {
+    const receipt = createStaleMemoryQuarantineReceipt({ source: "none", claims: [] });
+
+    expect(receipt).toMatchObject({ decision: "ready", deployAttempted: false });
+  });
+
+  it("writes quarantine receipts", () => {
+    const dir = fs.mkdtempSync(path.join(os.tmpdir(), "stale-memory-quarantine-"));
+    const file = path.join(dir, "receipt.json");
+
+    writeStaleMemoryQuarantineReceipt(file, createFactoryMemoryQuarantineReceipt());
+
+    expect(JSON.parse(fs.readFileSync(file, "utf-8"))).toMatchObject({ schema: "fable.stale_memory.quarantine.v1" });
+    fs.rmSync(dir, { recursive: true, force: true });
+  });
+});
diff --git a/src/fable5/stale-memory-quarantine.ts b/src/fable5/stale-memory-quarantine.ts
new file mode 100644
index 0000000..21c5931
--- /dev/null
+++ b/src/fable5/stale-memory-quarantine.ts
@@ -0,0 +1,53 @@
+import * as fs from "node:fs";
+import * as path from "node:path";
+
+export type StaleMemorySeverity = "advisory" | "dangerous";
+
+export interface StaleMemoryClaim {
+  claim: string;
+  staleBecause: string;
+  replacementTruth: string;
+  severity: StaleMemorySeverity;
+}
+
+export interface StaleMemoryQuarantineReceipt {
+  schema: "fable.stale_memory.quarantine.v1";
+  createdAt: string;
+  source: string;
+  claims: StaleMemoryClaim[];
+  blockedTrustPaths: string[];
+  canonicalTrustPaths: string[];
+  decision: "quarantined" | "ready";
+  deployAttempted: false;
+}
+
+export function createStaleMemoryQuarantineReceipt(opts: { source: string; claims: StaleMemoryClaim[]; now?: Date }): StaleMemoryQuarantineReceipt {
+  return {
+    schema: "fable.stale_memory.quarantine.v1",
+    createdAt: (opts.now ?? new Date()).toISOString(),
+    source: opts.source,
+    claims: opts.claims,
+    blockedTrustPaths: ["8098/deploy-webhook", "memory-only deploy authority", "autonomous deploy without fresh gate receipt"],
+    canonicalTrustPaths: ["live receipt > committed receipt > memory", "8099/deploy via git-proxy", "explicit approval + fresh valid ZTE/factory gate receipt"],
+    decision: opts.claims.length > 0 ? "quarantined" : "ready",
+    deployAttempted: false,
+  };
+}
+
+export function createFactoryMemoryQuarantineReceipt(now = new Date()): StaleMemoryQuarantineReceipt {
+  return createStaleMemoryQuarantineReceipt({
+    now,
+    source: "conversation memory summary",
+    claims: [
+      { claim: "25 containers", staleBecause: "fresh factory receipts verified 18 containers", replacementTruth: "container count must come from live factory reconciliation receipt", severity: "advisory" },
+      { claim: "8098/deploy-webhook is trusted deploy path", staleBecause: "current trust boundary marks 8098 legacy/stale only", replacementTruth: "8099/deploy via git-proxy is the canonical gated deploy route", severity: "dangerous" },
+      { claim: "agents can deploy without human intervention", staleBecause: "current policy requires explicit approval and fresh gate receipts", replacementTruth: "agents draft, receipts prove, humans approve, guarded 8099/deploy ships", severity: "dangerous" },
+    ],
+  });
+}
+
+export function writeStaleMemoryQuarantineReceipt(file: string, receipt: StaleMemoryQuarantineReceipt): string {
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  fs.writeFileSync(file, `${JSON.stringify(receipt, null, 2)}\n`);
+  return file;
+}
diff --git a/src/index.ts b/src/index.ts
index 5e3c714..c92ac4c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -2304,6 +2304,21 @@ fable
     if (receipt.decision === "blocked") process.exit(1);
   });
 
+fable
+  .command("stale-memory-quarantine")
+  .description("Quarantine stale factory memory so it cannot become deploy authority")
+  .option("--output <path>", "Receipt output path", path.join(".fable", "memory", "stale-memory-quarantine-live.json"))
+  .action(async (opts: { output?: string }) => {
+    const { createFactoryMemoryQuarantineReceipt, writeStaleMemoryQuarantineReceipt } = await import("./fable5/stale-memory-quarantine.js");
+    const receipt = createFactoryMemoryQuarantineReceipt();
+    const out = opts.output ?? path.join(".fable", "memory", "stale-memory-quarantine-live.json");
+    writeStaleMemoryQuarantineReceipt(out, receipt);
+    console.log(JSON.stringify(receipt, null, 2));
+    console.log(`
+  Receipt: ${out}
+`);
+  });
+
 fable
   .command("receipt-health")
   .description("Check receipt consumer health over a recent time window")