I'll start by reading the pinned inputs to understand what's required.The inputs are read. This is a fresh repo — I need to build imd-mcp, a TypeScript MCP stdio server. Let me check the toolchain first.Node 22 is available (project targets Node 20+). Scaffolding the project now.Dependencies installed (SDK 1.32.0, zod peer ^3.25). Now I'll write the project. First, let me check what landed in package.json:InMemoryTransport is available for an end-to-end MCP test. Now I'll build the project.Now the source files — config, utilities, and the API client:Now the API client:Now the payment/signing core:Now the tool handlers and MCP registration:Fixing a wrong import in index.ts (./runtime.js doesn't exist):Now the mock server and tests. First let me add a poll-options parameter to payOrder so tests run fast:Now the mock server and tests:Let me update the mock to record challenges (so tests can verify the QuoteApproval signature), then write helpers and tests:Now the test helpers and the two test files:A few fixes needed. First, index.ts main-module detection fails through the npx bin symlink — use realpath. Also clean up the awkward dynamic imports in the dry-run test:Let me move those imports to the top of index.ts for cleanliness:Now build and run the tests:Two fixes: privateKeyToAccount lives in viem/accounts, and the ajv default import resolves to the namespace under NodeNext. Let me check ajv's types:Mostly passing — 15/17. Let me see the failures and fix the test script path issue:Both failures are bugs in my test assertions, not the implementation: the payment object legitimately includes resource, and imd_quote+imd_pay each fetch a challenge (count 2, not 1). Fixing:All 17 tests pass. Verifying the CLI entry works:The server works end-to-end on stdio. Now README and LICENSE:Verifying a clean install works (prepare script path) and reviewing the final tree:Clean install works and prepare builds dist/. Final full test run and file audit:One portability concern: node --test glob/directory args differ between Node 20 and 22. Let me verify the right form:On Node 22 only the glob form works; on Node 20 the shell expands it. I'll use the unquoted glob so both work via the npm-script shell:All green. Let me clean up dead code — an unused envFlag in config.ts and unused imports in the tests:All 17 tests pass after cleanup. Let me do a final sanity read of the entry point and the full file listing:All checks pass. Final state of the deliverable:

imd-mcp — done

Layout

package.json / package-lock.json / tsconfig.json / .gitignore
README.md / LICENSE
src/
  config.ts    env-only config: IMD_PRIVATE_KEY, IMD_MAX_PER_REQUEST,
               IMD_MAX_PER_DAY, IMD_DRY_RUN (default true), spend tracker
  api.ts       thin fetch client: bearer auth, quote/submit/poll, check,
               import, openapi x-imd-actions, capabilities, jobs, schedules
  pay.ts       402 verification + EIP-712 PermitWitnessTransferFrom and
               QuoteApproval signing (viem, local only — no RPC)
  tools.ts     the 8 MCP tools, ajv validation against advertised schemas
  index.ts     stdio entry, --help/--version, bin target
tests/
  mock-server.ts  local api.imd.fun mock (no mainnet, throwaway keys)
  flow.test.ts    full quote → 402 → sign → submit → poll; verifies both
                  EIP-712 signatures recover to the test key, payment shape,
                  deadline = expiresAt−5s, key-sorted sha256 paymentHash;
                  plus an end-to-end pass over a real MCP InMemoryTransport
  safety.test.ts  dry-run stops before signing, confirm required, read-only
                  without key, payTo/asset/amount mismatch refusals,
                  per-request + per-day caps, evaluator retry
  helpers.ts

Verification results

• npm test — builds, then 17/17 pass against the local mock (# pass 17, # fail 0)
• npm ci from scratch works; prepare compiles dist/, bin: imd-mcp → dist/src/index.js

Recorded five findings in .imd-findings.json:

• High: concurrent cap bypass, lost-response accounting, restart resets, and duplicate payment authorizations on retry.
• Low: invalid key disclosure through error messages.

Each includes an exact reproduction and verified source snippet. Checks used local mocks and throwaway keys; implementation files remain unchanged.

Implemented all reported fixes and recorded verdicts in .imd-responses.json.

Key changes:

• Atomic pre-sign spending reservations, retained on lost responses.
• Durable per-wallet daily ledger across server restarts.
• Pending orders only poll on retry; no second Permit2 signature.
• Out-of-range private keys fail generically without disclosure.
• Added local mock regression tests for all findings.

Verified in an isolated lockfile-resolved copy: npm test passes, 22/22 tests.

The review is complete. Nothing in the tree was modified. The author's build and suite pass (22 of 22), and findings are written to .imd-findings.json.

All five earlier findings are fixed. I reran each with my own reproductions rather than only the author's regressions:

• Concurrent payments exceed the daily cap (high). Fixed. Four concurrent payOrder calls against a 0.5 IMD daily cap now produce exactly one signed submission and three per-day cap refusals, with both the in-memory tracker and the per-wallet ledger. The reservation in SpendTracker.reserve is taken before signPayment runs.
• Lost submit response removes an accepted payment from accounting (high). Fixed. With the mock accepting then destroying the socket, the tracker still shows 0.5 IMD reserved, a retry of the same order only polls, and the next order is cap-refused.
• Restart resets the daily limit (high). Fixed. Using the exact construction in main (wallet address from the key, ledger under the user state directory), a second process with the same key and fresh in-memory state is refused. Two separate OS processes paying concurrently against one ledger yield one payment. The ledger file is mode 0600 and holds only day, order ids and amounts.
• Retrying a pending order signs a second Permit2 nonce (high). Fixed. A retry while the server reports admission_pending only polls. I also tested a variant where the server reverts the order to quoted after the first accepted submit. That retry is refused because of the existing local reservation, so one nonce exists in every path.
• Out-of-range key disclosed in the error (low). Fixed. The all-ff key, the exact curve order, and the zero key all produce only IMD_PRIVATE_KEY is invalid. A hand-built config bypassing loadConfig reaches the generic refusal in signPayment with no key material in the output.

One new finding, low and non-blocking. The Permit2 deadline is expiresAt - 5s with no ceiling, and quoteLifetimeSeconds from capabilities is never consulted. A challenge whose expiresAt is ten years out yields a signed authorization for the verified amount and payTo that stays executable for ten years. I reproduced it locally through a rewriting proxy. The exposure is bounded to one quoted amount per order, which is already reserved against the cap, so this does not reopen the money findings. A fix that keeps the agreed design is to cap the deadline at now plus the advertised quote lifetime plus a small slack.

Checked and found sound. The stale-lock cleanup cannot give two processes the lock at once, since a freshly created lock has a current mtime. An unreadable or malformed ledger, an unwritable state directory, and a lock wait timeout all refuse before signing. Dry run still verifies without reserving. The capped ledger file never contains the key, and no code path logs or writes it.