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feat(server): /.well-known/adcp-agents.json discovery endpoint (PR adcp#3903) #381

Description

@bokelley

Context

AdCP PR #3903 / commit 5c3e3e626 in the spec adds a /.well-known/adcp-agents.json discovery doc for multi-agent topology. Sellers should serve it; buyers should be able to discover it.

The schema lives at static/schemas/source/adcp-agents.json in adcontextprotocol/adcp.

Refs:

  • src/adcp/server/serve.py
  • adcontextprotocol/adcp PR #3903

Acceptance Criteria

  • Server-side: serve() exposes /.well-known/adcp-agents.json for transport="streamable-http", transport="a2a", and transport="both"
  • Document is generated from the platform's declared agents/capabilities — not a static file
  • Validates against the upstream adcp-agents.json schema in CI
  • Client-side helper to fetch + parse a remote discovery doc
  • Smoke test hits the endpoint on each transport mode and asserts the response validates

Activity

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