diff --git a/src/x402-core.ts b/src/x402-core.ts
index f563831..9d1d8d0 100644
--- a/src/x402-core.ts
+++ b/src/x402-core.ts
@@ -644,7 +644,7 @@ export function makeX402PaymentRequired(resourceUrl: string, accepted: X402Payme
     error,
     resource: {
       url: resourceUrl,
-      description: `${PUBLIC_AGENT_DESCRIPTION} See the public root and /openapi.json for buyer-fit guidance, labeled illustrative examples, and /privacy before submitting business context. U.S.-only public service in the 50 states and District of Columbia; U.S. territories unavailable.`,
+      description: "SecondLook provides an independent pre-action review of a proposed AI or agent action. It checks supplied facts, authority, constraints, reasoning, risks, and missing information before execution. Use it when an action is costly, external, irreversible, or constraint-sensitive. SecondLook does not authorize, execute, or supply missing authority, and results are not guarantees of correctness.",
       mimeType: "application/json",
       serviceName: "SecondLook",
       tags: ["ai", "agent", "review", "pre-action", "decision-support"],
@@ -707,10 +707,10 @@ async function cdpAuthorizationHeader(credentials: CdpFacilitatorCredentials, en
   const claims = base64Url(new TextEncoder().encode(JSON.stringify({
     sub: credentials.apiKeyId,
     iss: "cdp",
-    iat: now,
+    aud: ["cdp_service"],
     nbf: now,
     exp: now + 120,
-    uris: [`POST ${target.host}${target.pathname}`],
+    uri: `POST ${target.host}${target.pathname}`,
   })));
   const privateKey = await crypto.subtle.importKey("jwk", {
     kty: "OKP", crv: "Ed25519", d: base64Url(keyBytes.slice(0, 32)), x: base64Url(keyBytes.slice(32)),
diff --git a/test/x402-core-cdp-regression.test.ts b/test/x402-core-cdp-regression.test.ts
new file mode 100644
index 0000000..f9c5252
--- /dev/null
+++ b/test/x402-core-cdp-regression.test.ts
@@ -0,0 +1,101 @@
+import { describe, expect, it } from "vitest";
+import type { PaymentRequirement } from "../src/payments";
+import {
+  makeX402PaymentRequired,
+  X402FacilitatorAdapter,
+  X402_CDP_FACILITATOR,
+  type X402PaymentPayload,
+  type X402PaymentRequirements,
+} from "../src/x402-core";
+
+function base64UrlDecode(value: string): Uint8Array {
+  const padded = value.replace(/-/g, "+").replace(/_/g, "/").padEnd(Math.ceil(value.length / 4) * 4, "=");
+  return Uint8Array.from(atob(padded), (character) => character.charCodeAt(0));
+}
+
+function decodeJwtPart(value: string): Record<string, unknown> {
+  return JSON.parse(new TextDecoder().decode(base64UrlDecode(value))) as Record<string, unknown>;
+}
+
+describe("direct x402 core CDP compatibility", () => {
+  it("uses the bounded payment description and documented CDP JWT claims without wrapper repair", async () => {
+    const accepted: X402PaymentRequirements = {
+      scheme: "exact",
+      network: "eip155:8453",
+      amount: "50000",
+      asset: "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
+      payTo: "0x2222222222222222222222222222222222222222",
+      maxTimeoutSeconds: 60,
+      extra: { assetTransferMethod: "eip3009", paymentFlow: "upfront", name: "USD Coin", version: "2" },
+    };
+    const required = makeX402PaymentRequired("https://secondlook.example/v1/paid/second-look", accepted);
+    expect(required.resource.description.length).toBeLessThanOrEqual(500);
+    expect(required.resource.description).toContain("does not authorize, execute, or supply missing authority");
+
+    const pair = await crypto.subtle.generateKey({ name: "Ed25519" }, true, ["sign", "verify"]) as CryptoKeyPair;
+    const privateJwk = await crypto.subtle.exportKey("jwk", pair.privateKey);
+    const secret = btoa(String.fromCharCode(...base64UrlDecode(privateJwk.d ?? ""), ...base64UrlDecode(privateJwk.x ?? "")));
+
+    let authorizationHeader = "";
+    const fetcher = (async (_input: RequestInfo | URL, init?: RequestInit): Promise<Response> => {
+      const headers = new Headers(init?.headers);
+      authorizationHeader = headers.get("authorization") ?? "";
+      return new Response(JSON.stringify({
+        success: true,
+        payer: "0x3333333333333333333333333333333333333333",
+        transaction: `0x${"ef".repeat(32)}`,
+        network: accepted.network,
+        amount: accepted.amount,
+      }), { status: 200 });
+    }) as typeof fetch;
+
+    const requirement: PaymentRequirement = {
+      provider: "x402-facilitator",
+      protocol: "x402-v2-exact-eip3009-upfront",
+      amountAtomic: accepted.amount,
+      asset: accepted.asset,
+      network: accepted.network,
+      payTo: accepted.payTo,
+      requirementsJson: JSON.stringify(accepted),
+    };
+    const payload: X402PaymentPayload = {
+      x402Version: 2,
+      resource: required.resource,
+      accepted,
+      extensions: required.extensions,
+      payload: {
+        signature: `0x${"ab".repeat(65)}`,
+        authorization: {
+          from: "0x3333333333333333333333333333333333333333",
+          to: accepted.payTo,
+          value: accepted.amount,
+          validAfter: "1",
+          validBefore: "9999999999",
+          nonce: `0x${"cd".repeat(32)}`,
+        },
+      },
+    };
+
+    const adapter = new X402FacilitatorAdapter({
+      kind: "cdp",
+      url: X402_CDP_FACILITATOR,
+      apiKeyId: "test-cdp-key",
+      apiKeySecret: secret,
+    }, fetcher);
+    await expect(adapter.attemptAcceptance({ requestId: "core-regression", requirement, authorization: payload }))
+      .resolves.toMatchObject({ outcome: "accepted" });
+
+    const [, claimsPart] = authorizationHeader.replace(/^Bearer /, "").split(".");
+    const claims = decodeJwtPart(claimsPart ?? "");
+    expect(claims).toMatchObject({
+      sub: "test-cdp-key",
+      iss: "cdp",
+      aud: ["cdp_service"],
+      nbf: expect.any(Number),
+      exp: expect.any(Number),
+      uri: "POST api.cdp.coinbase.com/platform/v2/x402/settle",
+    });
+    expect(claims).not.toHaveProperty("iat");
+    expect(claims).not.toHaveProperty("uris");
+  });
+});