# The A2A Repair Kit

_tested failures, suggested fixes, a recheck and a week of card observations_


A2A agent checks, reproducible failures, repair guidance and a signed recheck.

## At a glance

- **Attests:** RFC 8785 canonical observation bytes: the card and endpoint URLs, moment, battery and protocol version, bounded exchanges, per-check states, counts and gaps. The purchase certificate binds the initial observation hash; each recheck and card-watch pass is signed separately.
- **Input:** url (query parameters; input schema and checkout: https://scvd.store/menu/a2a_repair_kit?view=compact)
- **Output:** A signed A2A report, suggested repairs, regression runner URL, private one-use recheck token and finite card-watch history Every artifact carries a cert_id and verifies free at https://scvd.store/api/verify/{cert_id}.
- **Cryptography:** ed25519 signature by this store's key, published at https://scvd.store/.well-known/scvd-signing-key and carried inside every 402
- **Verify:** GET https://scvd.store/api/verify/{cert_id} — free, no account, no rate limit, checkable offline with the published key
- **Price and fulfilment:** $49 USDC fixed, one-off; nothing here charges again by itself, ever — there is no mechanism that could; delivered instantly
- **Does not attest:** Complete A2A conformance, untested versions or transports, application correctness, safety, uptime, or that the suggested repairs were applied. The store authored the suggestions; implementation is separately scoped. Missing watch slots are counted against the observer.

## About this item

Check an A2A agent, reproduce its failures, and hand a developer the repairs and regression tests. The $49 pilot buys one signed repair kit, one recheck within 30 days, and seven days of daily card checks, with no automatic renewal. Supports public A2A 0.3.0 JSON-RPC endpoints with an operator-published safe test fixture. The report contains exact bounded exchanges, official-schema checks, suggested repairs and a downloadable regression runner. Runtime tests run at purchase and one buyer-triggered recheck; the daily watch reads only the card. Implementation in your repository is separately scoped. Free card checks and setup: /a2a-desk. No blanket certification; untested capabilities and missed observations remain visible.

- **id:** `a2a_repair_kit`
- **price:** $49 fixed, one-off; nothing here charges again by itself, ever — there is no mechanism that could
- **fulfillment:** delivered instantly
- **buy:** `GET https://scvd.store/api/buy/a2a_repair_kit?url=<url>` (USDC over x402 v2 on Base, Polygon, Arbitrum, World, Solana, Arc (Circle Gateway), or USDC over MPP (evm/charge) on Base for every shelf item, every publication page and the commission desk)
- **required inputs:** `url` — fill the `<url>` slot above before paying. The bare door `GET https://scvd.store/api/buy/a2a_repair_kit` quotes free and refuses the paid request without it; no money moves.
- **sample:** https://scvd.store/samples/a2a-repair-kit.json
- **does not prove:** Complete A2A conformance, untested versions or transports, application correctness, safety, uptime, or that the suggested repairs were applied. The store authored the suggestions; implementation is separately scoped. Missing watch slots are counted against the observer.

House rules: url is the full public https agent-card url; no query, fragment, credentials, private address or our own hostname; before purchase publish /.well-known/scvd-a2a-audit.json on the same origin, with the safe-to-repeat fixture and explicit permission described at /a2a-desk; only public test data; no secrets, credentials or wallet material; one recheck within 30 days; keep the purchase token private. removing or expiring the authorization file revokes runtime permission; seven days of card observations, ending automatically. no automatic renewal; repairs are suggestions, not source-inspected patches. code implementation requires a separate quote.

> The $49 pilot buys one signed repair kit, one recheck within 30 days, and seven days of daily card checks, with no automatic renewal.