diff --git a/src/fable5/distillation-receipt.test.ts b/src/fable5/distillation-receipt.test.ts
new file mode 100644
index 0000000..d8e3113
--- /dev/null
+++ b/src/fable5/distillation-receipt.test.ts
@@ -0,0 +1,41 @@
+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 { createDistillationReceipt, writeDistillationReceipt } from "./distillation-receipt.js";
+
+describe("distillation receipt", () => {
+  it("allows open-weight teacher provenance", () => {
+    const receipt = createDistillationReceipt({
+      dataset: "math_train_sample.json",
+      output: "distill.json",
+      teacherModel: "qwen3:4b",
+      provider: "ollama",
+      teacherKind: "open-weight",
+      samples: 10,
+      now: new Date("2026-06-27T00:00:00.000Z"),
+    });
+
+    expect(receipt.schema).toBe("fable.distillation.receipt.v1");
+    expect(receipt.decision).toBe("ok");
+    expect(receipt.reasons).toEqual([]);
+  });
+
+  it("flags closed or unknown teachers for review", () => {
+    const closed = createDistillationReceipt({ dataset: "x", output: "y", teacherModel: "claude", provider: "openrouter", teacherKind: "closed-frontier" });
+    const unknown = createDistillationReceipt({ dataset: "x", output: "y", teacherModel: "mystery", provider: "other" });
+
+    expect(closed.decision).toBe("needs-review");
+    expect(closed.reasons.join("\n")).toContain("closed-frontier teacher output");
+    expect(unknown.decision).toBe("needs-review");
+    expect(unknown.reasons.join("\n")).toContain("teacher kind unknown");
+  });
+
+  it("writes a JSON receipt", () => {
+    const dir = fs.mkdtempSync(path.join(os.tmpdir(), "distill-receipt-"));
+    const file = path.join(dir, "receipt.json");
+    writeDistillationReceipt(file, createDistillationReceipt({ dataset: "x", output: "y", teacherModel: "qwen", provider: "ollama", teacherKind: "open-weight" }));
+
+    expect(fs.readFileSync(file, "utf-8")).toContain("fable.distillation.receipt.v1");
+  });
+});
diff --git a/src/fable5/distillation-receipt.ts b/src/fable5/distillation-receipt.ts
new file mode 100644
index 0000000..4a439b8
--- /dev/null
+++ b/src/fable5/distillation-receipt.ts
@@ -0,0 +1,55 @@
+import * as fs from "node:fs";
+import * as path from "node:path";
+
+export type DistillationTeacherKind = "open-weight" | "closed-frontier" | "unknown";
+export type DistillationProvider = "ollama" | "openrouter" | "other";
+
+export interface DistillationReceiptOptions {
+  dataset: string;
+  output: string;
+  teacherModel: string;
+  provider: DistillationProvider;
+  teacherKind?: DistillationTeacherKind;
+  samples?: number;
+  now?: Date;
+}
+
+export interface DistillationReceipt {
+  schema: "fable.distillation.receipt.v1";
+  createdAt: string;
+  dataset: string;
+  output: string;
+  teacherModel: string;
+  provider: DistillationProvider;
+  teacherKind: DistillationTeacherKind;
+  samples?: number;
+  decision: "ok" | "needs-review";
+  reasons: string[];
+}
+
+export function createDistillationReceipt(opts: DistillationReceiptOptions): DistillationReceipt {
+  const teacherKind = opts.teacherKind ?? "unknown";
+  const reasons: string[] = [];
+  if (teacherKind === "closed-frontier") reasons.push("closed-frontier teacher output requires explicit terms/provenance approval before training");
+  if (teacherKind === "unknown") reasons.push("teacher kind unknown; do not claim compliant/open distillation");
+  if (opts.provider === "openrouter" && teacherKind !== "open-weight") reasons.push("OpenRouter can route many model types; record the exact teacher model and policy posture");
+
+  return {
+    schema: "fable.distillation.receipt.v1",
+    createdAt: (opts.now ?? new Date()).toISOString(),
+    dataset: opts.dataset,
+    output: opts.output,
+    teacherModel: opts.teacherModel,
+    provider: opts.provider,
+    teacherKind,
+    samples: opts.samples,
+    decision: reasons.length ? "needs-review" : "ok",
+    reasons,
+  };
+}
+
+export function writeDistillationReceipt(file: string, receipt: DistillationReceipt): string {
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  fs.writeFileSync(file, `${JSON.stringify(receipt, null, 2)}\n`);
+  return file;
+}
diff --git a/src/fable5/index.ts b/src/fable5/index.ts
index ba83ad4..71500b5 100644
--- a/src/fable5/index.ts
+++ b/src/fable5/index.ts
@@ -72,7 +72,10 @@ export { createDuelEvalReceipt, createEvalTraceReceipt, gradeSetRecovery, tallyD
 export type { DuelEvalReceipt, DuelTally, EvalTraceCommand, EvalTraceReceipt, SetGradeReceipt } from "./eval-trace.js";
 
 export { loadBenchHarnesses, runAgentBench, writeAgentBenchReceipt } from "./agent-bench.js";
-export type { AgentBenchOptions, AgentBenchReceipt, BenchContenderId, BenchContenderResult, BenchHarnessConfig } from "./agent-bench.js";
+export type { AgentBenchOptions, AgentBenchReceipt, BenchContenderId, BenchContenderResult, BenchHarnessConfig, BenchmarkHygiene } from "./agent-bench.js";
+
+export { createDistillationReceipt, writeDistillationReceipt } from "./distillation-receipt.js";
+export type { DistillationProvider, DistillationReceipt, DistillationReceiptOptions, DistillationTeacherKind } from "./distillation-receipt.js";
 
 export { auditGoalCompletion, writeGoalAuditReceipt } from "./goal-audit.js";
 export type { GoalAuditCriterion, GoalAuditReceipt } from "./goal-audit.js";