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A2A channels serve HTTP+JSON and the PACT profiles

Changelog

Feature Platform CloudAgent protocols, API

In 0.44.0

A2A (Agent2Agent)A2A (Agent2Agent)#4322#4328#4350#4352

Every A2A channel URL now also serves the A2A 1.0 HTTP+JSON binding: message:send, message:stream, task get, list, cancel and subscribe, push notification configs and the extended card. The Agent Card lists the new interface, and auth, rate limits and signing are shared with JSON-RPC.

Add pact to an A2A channel’s config to accept personal agents under the PACT 1.0 Identity profile, with each conversation bound to the calling user. With delegation on, the channel runs an OAuth device-code sign-in so a personal agent can act as a company user through the configured MCP server, and delegated replies carry a signed receipt.

See A2A, Personal agents (PACT) and #4322, #4328, #4350, #4352.