diff --git a/src/fable5/index.ts b/src/fable5/index.ts
index fe38da9..47eb4a4 100644
--- a/src/fable5/index.ts
+++ b/src/fable5/index.ts
@@ -93,6 +93,9 @@ export type { RedTeamHarnessDecision, RedTeamHarnessReceipt, RedTeamHarnessRecei
 export { createModelAccessReceipt, writeModelAccessReceipt } from "./model-access-receipt.js";
 export type { ModelAccessProbe, ModelAccessReceipt, ModelAccessReceiptOptions, ModelAccessStatus, ModelAccessSurface } from "./model-access-receipt.js";
 
+export { createPlanReceipt, writePlanReceipt } from "./plan-receipt.js";
+export type { PlanPhase, PlanReceipt, PlanReceiptOptions } from "./plan-receipt.js";
+
 export { auditGoalCompletion, writeGoalAuditReceipt } from "./goal-audit.js";
 export type { GoalAuditCriterion, GoalAuditReceipt } from "./goal-audit.js";
 
diff --git a/src/fable5/plan-receipt.test.ts b/src/fable5/plan-receipt.test.ts
new file mode 100644
index 0000000..8719a9b
--- /dev/null
+++ b/src/fable5/plan-receipt.test.ts
@@ -0,0 +1,55 @@
+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 { createPlanReceipt, writePlanReceipt } from "./plan-receipt.js";
+
+const phase = {
+  name: "Implement",
+  goal: "Add the smallest useful receipt schema",
+  acceptanceCriteria: ["schema is typed", "receipt is writable"],
+  verification: ["npm run -s test -- src/fable5/plan-receipt.test.ts"],
+};
+
+describe("plan receipt", () => {
+  it("marks complete structured plans ready", () => {
+    const receipt = createPlanReceipt({
+      task: "Add plan receipts",
+      requirements: ["phases", "acceptance criteria", "verification"],
+      phases: [phase],
+      now: new Date("2026-06-28T00:00:00.000Z"),
+    });
+
+    expect(receipt.schema).toBe("fable.plan.receipt.v1");
+    expect(receipt.decision).toBe("ready");
+    expect(receipt.source).toContain("youtu.be/DzbqeO_diOQ");
+    expect(receipt.reasons).toEqual([]);
+  });
+
+  it("requires acceptance criteria and verification per phase", () => {
+    const receipt = createPlanReceipt({
+      task: "vague task",
+      phases: [{ name: "Phase 1", goal: "Do thing", acceptanceCriteria: [], verification: [] }],
+    });
+
+    expect(receipt.decision).toBe("blocked");
+    expect(receipt.reasons).toContain("each phase needs acceptance criteria");
+    expect(receipt.reasons).toContain("each phase needs verification steps");
+  });
+
+  it("separates clarifying questions from blocked plans", () => {
+    const receipt = createPlanReceipt({ task: "Add feature", questions: ["Which API?"], phases: [phase] });
+
+    expect(receipt.decision).toBe("needs_clarification");
+    expect(receipt.reasons).toEqual([]);
+  });
+
+  it("writes a JSON receipt", () => {
+    const dir = fs.mkdtempSync(path.join(os.tmpdir(), "plan-receipt-"));
+    const file = path.join(dir, "receipt.json");
+
+    writePlanReceipt(file, createPlanReceipt({ task: "x", phases: [phase] }));
+
+    expect(fs.readFileSync(file, "utf-8")).toContain("fable.plan.receipt.v1");
+  });
+});
diff --git a/src/fable5/plan-receipt.ts b/src/fable5/plan-receipt.ts
new file mode 100644
index 0000000..bb12b54
--- /dev/null
+++ b/src/fable5/plan-receipt.ts
@@ -0,0 +1,58 @@
+import * as fs from "node:fs";
+import * as path from "node:path";
+
+export interface PlanPhase {
+  name: string;
+  goal: string;
+  acceptanceCriteria: string[];
+  verification: string[];
+}
+
+export interface PlanReceiptOptions {
+  task: string;
+  requirements?: string[];
+  questions?: string[];
+  phases: PlanPhase[];
+  source?: string;
+  now?: Date;
+}
+
+export interface PlanReceipt {
+  schema: "fable.plan.receipt.v1";
+  createdAt: string;
+  source: string;
+  task: string;
+  requirements: string[];
+  questions: string[];
+  phases: PlanPhase[];
+  decision: "ready" | "needs_clarification" | "blocked";
+  reasons: string[];
+}
+
+export function createPlanReceipt(opts: PlanReceiptOptions): PlanReceipt {
+  const requirements = opts.requirements ?? [];
+  const questions = opts.questions ?? [];
+  const reasons: string[] = [];
+  if (!opts.task.trim()) reasons.push("missing task");
+  if (opts.phases.length === 0) reasons.push("missing phases");
+  if (opts.phases.some((phase) => phase.acceptanceCriteria.length === 0)) reasons.push("each phase needs acceptance criteria");
+  if (opts.phases.some((phase) => phase.verification.length === 0)) reasons.push("each phase needs verification steps");
+
+  return {
+    schema: "fable.plan.receipt.v1",
+    createdAt: (opts.now ?? new Date()).toISOString(),
+    source: opts.source ?? "plan skill inspiration: https://youtu.be/DzbqeO_diOQ",
+    task: opts.task,
+    requirements,
+    questions,
+    phases: opts.phases,
+    decision: reasons.length ? "blocked" : questions.length ? "needs_clarification" : "ready",
+    reasons,
+  };
+}
+
+export function writePlanReceipt(file: string, receipt: PlanReceipt): string {
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  fs.writeFileSync(file, `${JSON.stringify(receipt, null, 2)}\n`);
+  return file;
+}