A202 MCP server

A202: the Verifiable Agreement Protocol for Agent-Led Commerce

Status: Informative in full.

A202 is verifiable commerce for agent-to-agent or agent-led transactions: an open specification of commercial authority, negotiation state, and verifiable conformance for transactions between independent organisations, including transactions conducted on their behalf by software agents.

It defines typed objects for delegated commercial authority, a state machine for the transaction and for each bilateral session inside it, rules for what may be disclosed to whom, and an executable conformance suite that turns each of those into a check an implementation either passes or fails.

The full statement of purpose, scope, and non-goals is in CHARTER.md.

Created and developed by A. A. Musse. See MAINTAINERS.md.

Status

Released, pre-1.0.

• v0.1.0 is the first tagged release of the set: a tag, a digest for every schema file, the conformance manifest, and release notes, published together. See RELEASES.md and CHANGELOG.md. Before 1.0 a MINOR increment may break compatibility, and any break carries migration notes.
• The name is A202, spoken "A two-oh-two", and in full A202, the Verifiable Agreement Protocol for Agent-Led Commerce. The long form is a descriptor and not an expansion: the letters do not stand for it. The 202 is HTTP 202 Accepted, which A202-0017 makes the status an accepted submission returns, because acceptance is the primitive the rest of the specification is built on. The A202- reason-code prefix, the A202-NNNN proposal identifiers, and the a202-commercial/0.1 specification version string all follow from the name.
• A202™ is a trademark of Plural Worlds. Permitted use of the name is stated in TRADEMARK.md.
• Schema $id values resolve under https://schemas.a202.org. Fixture hosts use reserved .invalid names, because test data must never resolve.
• Licensed under the Apache License, Version 2.0. One licence covers the whole repository: specification text, schemas, fixtures, manifest, runner, and informative documents. The licence carries an express patent grant from each contributor. See LICENSE and CONTRIBUTING.md.
• External contributions are accepted on the terms in CONTRIBUTING.md: inbound contributions under the same licence, with a developer certificate of origin sign-off.

Layout

Shortened. The full README is on GitHub.