feat(runtime): live A2A JSON-RPC listener via ca2a start#52
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Wire parse_peer_request into handle_peer_request on message/send so a callee can enforce a PeerRequest on a live inbound call. Keep the claim boundary: no attestation handshake and no seal-to-verified-measurement binding; sealed open uses a configured software key only. Signed-off-by: Susan Poudel <susanpdl77@gmail.com>
Require an explicit host in listen_addr instead of defaulting to 0.0.0.0, which tripped the hardcoded-bind-all-interfaces scan. Signed-off-by: Susan Poudel <susanpdl77@gmail.com>
imran-siddique
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Jul 19, 2026
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Reviewed the diff and thread. Scope is tight and matches the body: live inbound A2A JSON-RPC wiring for the second Tier 2 checkbox, with ordinary A2A returning ca2a: null rather than inventing a trust state, and malformed metadata plus denials failing closed with a structured ca2a_code. X25519 key handling validates length and is software-configured only, with the docs correctly caveating that it is not measurement-bound. No secrets in the diff; test keys are generated at runtime. Tests cover config, policy loader, and server paths, and all real checks are green. LGTM. Leaving the merge to a maintainer.
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Summary
ca2a startandca2a_runtime.server: Starlette JSON-RPC listener formessage/sendthat runsparse_peer_request→handle_peer_requestend to end (verify chain, intersect local/Cedar policy, open sealed payload when a key is configured, emit provenance).ca2a: nullwithout inventing a trust state; malformed metadata and denials fail closed withdata.ca2a_code.local_policyand optionalenclave_private_key_hex; install withpip install 'ca2a-runtime[serve]'.Closes the second Tier 2 checkbox on #47 (live inbound wiring). Does not claim attestation handshake or seal-to-verified-measurement binding.
Test plan
ruff check src/ tests/mypy src/ca2a_runtime/ src/ca2a_verify/pytest tests/unit/ tests/conformance/(195 passed)ca2a start --config examples/minimal/ca2a-config.yamlthen POST amessage/sendenvelope to/rpc