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UAT: A2A server transports and Agent Card discovery missing #6968

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opened 2026-04-10 06:06:22 +00:00 by HAL9000 · 0 comments
HAL9000 commented 2026-04-10 06:06:22 +00:00
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What was tested

  • Verified the A2A protocol implementation for server transports, Agent Card discovery, and SSE streaming against docs/specification.md on commit 51aab18411.

Expected behavior

  • The HTTP transport described in the spec should let clients connect to the CleverAgents server in server mode so JSON-RPC 2.0 calls succeed.
  • Agent Card discovery (message/agentCard and related operations) should be implemented so clients can enumerate capabilities, auth schemes, and metadata.
  • Remote SSE streaming should be available for plan/task updates as part of the A2A streaming architecture.

Actual behavior

  • A2aHttpTransport (src/cleveragents/a2a/transport.py, lines 22-67) is a stub that always raises A2aNotAvailableError, so any attempt to use the HTTP binding immediately fails.
  • Remote subscriptions (A2aEventQueue.subscribe_remote in src/cleveragents/a2a/events.py, lines 122-134) also raise A2aNotAvailableError, leaving no SSE streaming path in server mode.
  • There is no Agent Card implementation anywhere in src/cleveragents/a2a; searching for AgentCard or _cleveragents/agentCard returns no results, so the required discovery endpoint is missing entirely.
  • CLI bootstrap (src/cleveragents/a2a/cli_bootstrap.py) wires commands directly to the local facade instead of using the stdio JSON-RPC bridge promised in the spec, so there is no stdio transport either.

Steps to reproduce

  1. From the repository root, run a Python shell and execute: 
    from cleveragents.a2a.transport import A2aHttpTransport
A2aHttpTransport().connect('http://localhost:9000')
    The call raises A2aNotAvailableError because the transport is a stub.
  2. Attempt to subscribe to remote events: 
    from cleveragents.a2a.events import A2aEventQueue
A2aEventQueue().subscribe_remote('http://localhost:9000/sse')
    This raises the same A2aNotAvailableError, demonstrating the missing SSE support.
  3. Search the codebase for the Agent Card operations (AgentCard or _cleveragents/agentCard) – no matches are found, confirming the discovery API is unimplemented.

Code location

  • src/cleveragents/a2a/transport.py
  • src/cleveragents/a2a/events.py
  • src/cleveragents/a2a/cli_bootstrap.py
  • entire src/cleveragents/a2a module lacks Agent Card handling
## What was tested - Verified the A2A protocol implementation for server transports, Agent Card discovery, and SSE streaming against `docs/specification.md` on commit 51aab184112728471a44d5a91c334663cf8cd016. ## Expected behavior - The HTTP transport described in the spec should let clients connect to the CleverAgents server in server mode so JSON-RPC 2.0 calls succeed. - Agent Card discovery (`message/agentCard` and related operations) should be implemented so clients can enumerate capabilities, auth schemes, and metadata. - Remote SSE streaming should be available for plan/task updates as part of the A2A streaming architecture. ## Actual behavior - `A2aHttpTransport` (`src/cleveragents/a2a/transport.py`, lines 22-67) is a stub that always raises `A2aNotAvailableError`, so any attempt to use the HTTP binding immediately fails. - Remote subscriptions (`A2aEventQueue.subscribe_remote` in `src/cleveragents/a2a/events.py`, lines 122-134) also raise `A2aNotAvailableError`, leaving no SSE streaming path in server mode. - There is no Agent Card implementation anywhere in `src/cleveragents/a2a`; searching for `AgentCard` or `_cleveragents/agentCard` returns no results, so the required discovery endpoint is missing entirely. - CLI bootstrap (`src/cleveragents/a2a/cli_bootstrap.py`) wires commands directly to the local facade instead of using the stdio JSON-RPC bridge promised in the spec, so there is no stdio transport either. ## Steps to reproduce 1. From the repository root, run a Python shell and execute: ```python from cleveragents.a2a.transport import A2aHttpTransport A2aHttpTransport().connect('http://localhost:9000') ``` The call raises `A2aNotAvailableError` because the transport is a stub. 2. Attempt to subscribe to remote events: ```python from cleveragents.a2a.events import A2aEventQueue A2aEventQueue().subscribe_remote('http://localhost:9000/sse') ``` This raises the same `A2aNotAvailableError`, demonstrating the missing SSE support. 3. Search the codebase for the Agent Card operations (`AgentCard` or `_cleveragents/agentCard`) – no matches are found, confirming the discovery API is unimplemented. ## Code location - `src/cleveragents/a2a/transport.py` - `src/cleveragents/a2a/events.py` - `src/cleveragents/a2a/cli_bootstrap.py` - entire `src/cleveragents/a2a` module lacks Agent Card handling
HAL9000 added the
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 label 2026-04-10 06:18:42 +00:00
HAL9000 self-assigned this 2026-04-10 06:21:44 +00:00
HAL9000 added this to the v3.7.0 milestone 2026-04-10 06:21:45 +00:00
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 labels 2026-04-10 06:22:41 +00:00
freemo added
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aditya (Aditya Chhabra) aleenaumair (Aleena Umair) brent.edwards (Brent Edwards) CoreRasurae (Luis Mendes) drew (Drew Morris) eugen.thaci (Eugen Thaci) freemo (Jeffrey Phillips Freeman) HAL9000 (HAL 9000) HAL9001 (HAL9001) hamza.khyari (Hamza Khyari) hurui200320 (Rui Hu) justin.morris khird (Kyle Hird) org.cleveragents
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Reference: cleveragents/cleveragents-core#6968
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