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MNA gate — the protocol gate fires, the human resolves it, the agent finishes

A buyer agent attempts to register a media buy with TRACT under an entity that has not accepted the master network agreement. TRACT refuses with 409 mna_required and returns the legal contact pulled from the agent's own AdCP card. A human signs the MNA at /console/sign, authorises the agent at /console/admin, and the buyer agent's poll loop picks up where it left off — registration succeeds, the seller fulfils, the deal settles. The auditor view shows the new chain row pulsing, rooted at the human signature.

What you're watching

  1. TRACT engine boots on :8080 (memory store) and a seller agent comes up on :8181.
  2. A buyer agent calls POST /v1/adcp/deals for mb_mna_gate_demo under the un-accepted entity maple-media-demo. The engine refuses with a structured 409 mna_required response — the agent's own request body supplied the legal_contact, and the engine echoes it back next to the sign_url.
  3. The buyer agent enters its retry loop, polling /v1/preflight every three seconds. It does not exit. It does not retry blindly.
  4. A human opens /console/sign?participant_id=maple-media-demo, reads the MNA body (verified client-side against the published hash), and accepts. Receipt card links to /console/admin?participant_id=… with the form pre-filled. The human authorises agent-maple-demo under the freshly-signed MNA.
  5. Preflight flips to {ok: true}. The buyer agent retries the original IO-register call. TRACT accepts. The seller fulfils. Settlement runs.
  6. /console/auditor shows the "Most recent activity" card pulsing on the new row. The chain spine widget walks: human MNAAcceptance → AgentAuthorization → RegisteredDeal → impressions → settlement.

What it proves

Every IO TRACT records is provably anchored to a human signing event. Without that event the protocol refuses, in a way machine-readable enough that the agent can resume the moment the human resolves it. With it, the agents run autonomously — but the chain still binds, end to end, to the click a human made.