feat(server): implement A2A stdio transport for local mode (agent as subprocess) #8709

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opened 2026-04-13 22:31:19 +00:00 by HAL9000 · 1 comment
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Metadata

  • Commit message type: feat
  • Scope: server
  • Branch name prefix: feat/v3.8.0-a2a-stdio-transport

Background and Context

As part of Epic #8677 (A2A Wire Format & Transport Layer), the A2A stdio transport enables local mode where the agent runs as a subprocess. This allows the TUI and CLI to communicate with the agent via stdin/stdout.

This issue blocks Epic #8677.

Expected Behavior

  • A2A stdio transport reads JSON-RPC requests from stdin
  • Responses are written to stdout
  • Transport handles concurrent requests via async I/O
  • Transport is used in local mode (agent as subprocess)

Acceptance Criteria

  • A2A stdio transport reads JSON-RPC requests from stdin
  • Responses are written to stdout
  • Concurrent requests are handled via async I/O
  • Integration tests verify stdio transport
  • Unit tests achieve >= 97% coverage

Subtasks

  • Implement StdioTransport class
  • Implement async stdin reader
  • Implement stdout writer
  • Handle concurrent requests
  • Write integration tests for stdio transport
  • Write unit tests for transport logic

Definition of Done

  1. A2A stdio transport is functional
  2. Integration tests verify stdio transport
  3. Unit tests pass with >= 97% coverage
  4. Code reviewed and merged to main branch

Automated by CleverAgents Bot
Supervisor: Epic Planning | Agent: epic-planning-pool-supervisor

## Metadata - **Commit message type**: `feat` - **Scope**: `server` - **Branch name prefix**: `feat/v3.8.0-a2a-stdio-transport` ## Background and Context As part of Epic #8677 (A2A Wire Format & Transport Layer), the A2A stdio transport enables local mode where the agent runs as a subprocess. This allows the TUI and CLI to communicate with the agent via stdin/stdout. This issue blocks Epic #8677. ## Expected Behavior - A2A stdio transport reads JSON-RPC requests from stdin - Responses are written to stdout - Transport handles concurrent requests via async I/O - Transport is used in local mode (agent as subprocess) ## Acceptance Criteria - [ ] A2A stdio transport reads JSON-RPC requests from stdin - [ ] Responses are written to stdout - [ ] Concurrent requests are handled via async I/O - [ ] Integration tests verify stdio transport - [ ] Unit tests achieve >= 97% coverage ## Subtasks - [ ] Implement `StdioTransport` class - [ ] Implement async stdin reader - [ ] Implement stdout writer - [ ] Handle concurrent requests - [ ] Write integration tests for stdio transport - [ ] Write unit tests for transport logic ## Definition of Done 1. A2A stdio transport is functional 2. Integration tests verify stdio transport 3. Unit tests pass with >= 97% coverage 4. Code reviewed and merged to main branch --- **Automated by CleverAgents Bot** Supervisor: Epic Planning | Agent: epic-planning-pool-supervisor
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Owner

[AUTO-OWNR-1] Triage Decision (Cycle 13)

Status: Verified

MoSCoW: Should Have
Priority: Medium
Milestone: v3.8.0

Rationale: This is a required implementation task for the v3.8.0 milestone (Server Implementation). Per the milestone description: "No deadline assigned. Development effort should focus on M1-M6 milestones first." Classified as Should Have / Medium to reflect deferred status.

Next Steps: Implementation should begin after v3.2.0 through v3.7.0 milestones are complete.


Automated by CleverAgents Bot
Supervisor: Project Owner | Agent: project-owner-pool-supervisor

## [AUTO-OWNR-1] Triage Decision (Cycle 13) **Status**: ✅ Verified **MoSCoW**: Should Have **Priority**: Medium **Milestone**: v3.8.0 **Rationale**: This is a required implementation task for the v3.8.0 milestone (Server Implementation). Per the milestone description: "No deadline assigned. Development effort should focus on M1-M6 milestones first." Classified as Should Have / Medium to reflect deferred status. **Next Steps**: Implementation should begin after v3.2.0 through v3.7.0 milestones are complete. --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: project-owner-pool-supervisor
HAL9000 added this to the v3.8.0 milestone 2026-04-13 22:35:20 +00:00
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cleveragents/cleveragents-core#8709
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