Latten

How do you use Codex to instrument an AI app with Latten?

Add the Latten MCP server to Codex and give it one task: provision an observe-only brain if no token exists, read the guide, scan the TypeScript repo, instrument high-confidence crossings with @latten/sdk, open a reviewable PR, verify real traffic, and return the trust receipt plus claim link.

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Start without a token

Codex does not need a Latten account before it can begin. The installer MCP exposes a provision tool that mints an observe-only brain and token for this repo, then returns a claim URL for the human to attach it to an account later.

Make the PR the trust artifact

Codex should never silently rewrite production code. The contract is a branch and a reviewable PR, with every inserted crossing marked so the diff is easy to audit and easy to revert.

Close on proof

After the PR runs against real traffic, Codex calls verify and receipt. The receipt is the value moment: what the AI reached, what it cost, how much was attributed, and confirmation that only types and counts — never PII values — crossed the wire.

How it works

  1. 1. Add the MCP server Configure Codex to run npx -y @latten/installer with LATTEN_URL=https://latten.io.
  2. 2. Ask Codex to provision If there is no LATTEN_TOKEN, Codex calls provision once and keeps the returned token for this repo.
  3. 3. Scan and instrument Codex reads guide, scans the repo, instruments high-confidence TypeScript crossings, and flags uncertain ones.
  4. 4. Verify and hand back the receipt After real traffic arrives, Codex verifies crossings and returns the receipt plus claim URL.

Common questions

Does Codex need a Latten account first?

No. The provision tool creates an observe-only brain and claim link before login.

Will Codex auto-merge instrumentation?

No. The expected output is a reviewable PR. A human approves and merges it.

What is free and what is paid?

Provisioning, first finding, and the trust receipt are free. The live fix list, agent handoff, verification loop, exports, and team history unlock with Solo or Team.

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