@@ -103,18 +103,24 @@ v2/main/
 │   │                                   #   token request is made against — #2110;
 │   │                                   #   revocation.ts RFC 7009 token revocation —
 │   │                                   #   the request the three clear paths send.
-│   │                                   #   TWO halves — planOAuthRevocation then
-│   │                                   #   executeOAuthRevocation — and the order
-│   │                                   #   between them is the contract: plan →
-│   │                                   #   storage.clear() → execute. The snapshot
-│   │                                   #   must precede the clear (the token, the
-│   │                                   #   client credentials and the discovered
-│   │                                   #   `revocation_endpoint` all live in the store
-│   │                                   #   it empties); the CLEAR must precede the
-│   │                                   #   network, or a fresh authorization
+│   │                                   #   TWO halves — clearAndPlanRevocation then
+│   │                                   #   executeOAuthRevocation — and the split is
+│   │                                   #   the contract. The first TAKES the stored
+│   │                                   #   state and CLEARS it in one atomic storage
+│   │                                   #   step (OAuthStorage.takeRevocationSnapshot);
+│   │                                   #   the second sends from what was taken.
+│   │                                   #   There is no separate `storage.clear()` in
+│   │                                   #   any caller, deliberately — the clear cannot
+│   │                                   #   be forgotten or reordered. Both halves of
+│   │                                   #   that matter: the requests need state the
+│   │                                   #   clear destroys, and the clear must not wait
+│   │                                   #   on the network, or a fresh authorization
 │   │                                   #   completing during a 5s request is deleted
 │   │                                   #   by a clear reasoning about the grant it
-│   │                                   #   replaced. Names the
+│   │                                   #   replaced. NOT cross-process atomic — no
+│   │                                   #   OAuth-store mutation takes a lock, and
+│   │                                   #   `clear` alone always had that property.
+│   │                                   #   Names the
 │   │                                   #   REFRESH token when there is one (§2.1 asks
 │   │                                   #   the AS to invalidate the access tokens
 │   │                                   #   under the same grant, so one request
 
@@ -333,6 +333,30 @@ describe("clearStoredAuthForRelogin", () => {
 
     // A grant still live at the authorization server is what the user needs to
     // hear about; reporting the earlier success would print no warning at all.
+    // One budget across both keys, so a first request that outlives it fails
+    // rather than each key getting a fresh five seconds.
+    it("bounds both keys with one shared budget", async () => {
+      seedBothSpellings("live-r", "stale-r");
+      const fetchSpy = vi
+        .spyOn(globalThis, "fetch")
+        .mockImplementation(async () => {
+          // Outlives the injected budget, so the second key is never attempted.
+          await new Promise((r) => setTimeout(r, 40));
+          return new Response(null, { status: 200 });
+        });
+      try {
+        const outcome = await clearStoredAuthForRelogin("https://example.com", {
+          budgetMs: 20,
+        });
+        expect(outcome).toMatchObject({ status: "failed" });
+        expect(outcome?.status === "failed" ? outcome.detail : "").toContain(
+          "timed out after 20ms",
+        );
+      } finally {
+        fetchSpy.mockRestore();
+      }
+    });
+
     it("reports a later failure over an earlier success", async () => {
       seedBothSpellings("live-r", "stale-r");
       const fetchSpy = vi
 
@@ -32,7 +32,15 @@ function normalizeServerUrl(serverUrl: string): string {
  */
 export async function clearStoredAuthForRelogin(
   serverUrl: string | undefined,
-  options?: { revoke?: boolean },
+  options?: {
+    revoke?: boolean;
+    /**
+     * Total wall-clock budget for the revocation requests across both key
+     * spellings. Defaults to {@link DEFAULT_REVOCATION_TIMEOUT_MS}; injectable
+     * so the exhaustion path can be exercised without a five-second test.
+     */
+    budgetMs?: number;
+  },
 ): Promise<TokenRevocationOutcome | undefined> {
   if (!serverUrl?.trim()) return undefined;
   const raw = serverUrl.trim();
@@ -68,7 +76,9 @@ export async function clearStoredAuthForRelogin(
   // entry from the NodeOAuthStorage cache.
   resetNodeOAuthStorageCache();
 
-  return options?.revoke === false ? undefined : sendPlans(plans);
+  return options?.revoke === false
+    ? undefined
+    : sendPlans(plans, options?.budgetMs ?? DEFAULT_REVOCATION_TIMEOUT_MS);
 }
 
 /**
@@ -100,9 +110,10 @@ export async function clearStoredAuthForRelogin(
  */
 async function sendPlans(
   plans: OAuthRevocationPlan[],
+  budgetMs: number,
 ): Promise<TokenRevocationOutcome | undefined> {
   const fetchFn = createProxyFetch() ?? fetch;
-  const deadlineAt = Date.now() + DEFAULT_REVOCATION_TIMEOUT_MS;
+  const deadlineAt = Date.now() + budgetMs;
   let reported: TokenRevocationOutcome | undefined;
   let lastSkip: TokenRevocationOutcome | undefined;
   for (const plan of plans) {
@@ -112,11 +123,19 @@ async function sendPlans(
     // may still be live when the key held no grant at all — a false alarm, and
     // one that outranks the real outcome under the failure-first rule below.
     const needsNetwork = plan.outcome === undefined;
+    /* v8 ignore next 10 -- A bound, not a path: `withDeadline` fails any plan
+       that reaches the deadline, so a preceding plan cannot both succeed and
+       leave zero budget. This exists so a plan reached with nothing left is
+       reported rather than firing a request it would immediately abandon. */
     if (needsNetwork && remainingMs <= 0) {
-      reported ??= {
+      // Overrides an earlier success rather than deferring to it: this key's
+      // grant may still be live at the authorization server, and that is the
+      // thing the user needs to hear about. Same failure-first rule as below.
+      const exhausted: TokenRevocationOutcome = {
         status: "failed",
-        detail: `the ${DEFAULT_REVOCATION_TIMEOUT_MS}ms revocation budget was exhausted before "${plan.serverUrl}" was attempted`,
+        detail: `the ${budgetMs}ms revocation budget was exhausted before "${plan.serverUrl}" was attempted`,
       };
+      if (reported?.status !== "failed") reported = exhausted;
       continue;
     }
     const outcome = await executeOAuthRevocation(plan, {
 
@@ -932,6 +932,54 @@ describe("revokeStoredOAuthTokens (plan + execute)", () => {
     expect(outcome).toMatchObject({ status: "failed" });
   });
 
+  // The preconfigured registration is only a *fallback*, so a malformed one
+  // must not abort grants that carry their own valid credentials.
+  it("still revokes when the preconfigured client registration is malformed", async () => {
+    stubSnapshot(storage, {
+      byIssuer: {
+        "https://as.example.com": {
+          tokens: {
+            access_token: "a",
+            token_type: "Bearer",
+            refresh_token: "r-good",
+          },
+          clientInformation: { client_id: "dcr-cid" },
+        },
+      },
+      // Not a valid `OAuthClientInformation` — no `client_id`.
+      preregisteredClientInformation: { client_secret: "orphan" },
+      serverMetadata: {
+        issuer: "https://as.example.com",
+        authorization_endpoint: "https://as.example.com/authorize",
+        token_endpoint: "https://as.example.com/token",
+        revocation_endpoint: REVOKE_URL,
+        response_types_supported: ["code"],
+      },
+    });
+    const fetchFn = vi.fn<typeof fetch>(
+      async () => new Response(null, { status: 200 }),
+    );
+
+    const outcome = await revokeStoredOAuthTokens({
+      serverUrl: SERVER_URL,
+      storage,
+      fetchFn,
+    });
+
+    // The grant was still revoked, with its OWN registration...
+    expect(fetchFn).toHaveBeenCalledTimes(1);
+    expect(
+      new URLSearchParams(String(fetchFn.mock.calls[0]![1]!.body)).get(
+        "client_id",
+      ),
+    ).toBe("dcr-cid");
+    // ...and the malformed fallback is reported rather than swallowed.
+    expect(outcome).toMatchObject({ status: "failed" });
+    expect(outcome.status === "failed" ? outcome.detail : "").toContain(
+      "preconfigured client registration",
+    );
+  });
+
   // A corrupt slot must not abandon the grants that are still revocable — the
   // state is gone either way, so the failure has to be reported BESIDE the
   // successes rather than instead of them.
 
@@ -438,7 +438,7 @@ interface CachedMetadata {
 }
 
 /**
- * Send the requests a {@link planOAuthRevocation} snapshot describes.
+ * Send the requests a {@link clearAndPlanRevocation} snapshot describes.
  *
  * Safe to run **after** `storage.clear(serverUrl)` — that is the point: the
  * plan already holds the tokens, the credentials and the endpoint, so nothing
@@ -539,9 +539,20 @@ async function collectGrants(
   const failures: TokenRevocationOutcome[] = [];
   const seenKeys = new Set<string>();
 
-  const preregistered = await parseClient(
-    snapshot.preregisteredClientInformation,
-  );
+  // Parsed defensively: it is only a *fallback*, so a malformed preconfigured
+  // registration must not abort grants that carry their own valid credentials.
+  // Recorded and skipped, matching the per-slot salvage below.
+  let preregistered: OAuthClientInformation | undefined;
+  try {
+    preregistered = await parseClient(snapshot.preregisteredClientInformation);
+  } catch (err) {
+    failures.push({
+      status: "failed",
+      detail: `could not read the preconfigured client registration: ${
+        err instanceof Error ? err.message : String(err)
+      }`,
+    });
+  }
 
   const add = async (
     issuer: string | undefined,
@@ -643,7 +654,7 @@ async function runPlan(
 ): Promise<TokenRevocationOutcome> {
   if (plan.outcome) return plan.outcome;
   const endpoint = plan.endpoint;
-  /* v8 ignore next -- `planOAuthRevocation` always sets `outcome` when it sets
+  /* v8 ignore next -- `clearAndPlanRevocation` always sets `outcome` when it sets
      no endpoint, so this is unreachable; the guard exists to narrow the type. */
   if (!endpoint) return { status: "skipped", reason: "no_endpoint" };