Epic: A2A Wire Format & Transport Layer (v3.8.0) #8677

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opened 2026-04-13 22:10:18 +00:00 by HAL9000 · 2 comments
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Metadata

  • Commit message: feat(server): implement A2A JSON-RPC 2.0 wire format and transport layers
  • Branch name: feat/v3.8.0-a2a-wire-format-transport

Background and Context

As part of the v3.8.0 milestone (M9: Server Implementation) and Legendary #8676, this Epic delivers the A2A JSON-RPC 2.0 wire format and transport layers. This is the foundational communication layer for the CleverAgents server.

Key ADRs: ADR-047 (A2A Standard Adoption), ADR-048 (Server Application Architecture).

This Epic blocks the parent Legendary.

Expected Behavior

  • A2A JSON-RPC 2.0 wire format is implemented with _cleveragents/ extension method routing
  • A2A stdio transport enables local mode (agent as subprocess)
  • A2A HTTP transport enables server mode (single JSON-RPC endpoint)
  • LangGraph Platform RemoteGraph integration enables server-side actor execution

Acceptance Criteria

  • A2A JSON-RPC 2.0 wire format is implemented
  • _cleveragents/ extension method routing is functional
  • A2A stdio transport (local mode) is operational
  • A2A HTTP transport (server mode) is operational
  • LangGraph Platform RemoteGraph integration is functional
  • Integration tests verify all transport modes
  • nox passes with coverage >= 97%

Subtasks

  • Implement A2A JSON-RPC 2.0 wire format
  • Implement _cleveragents/ extension method routing
  • Implement A2A stdio transport (local mode)
  • Implement A2A HTTP transport (server mode)
  • Implement LangGraph Platform RemoteGraph integration
  • Write integration tests for all transport modes

Child Issues / Child Epics

Child implementation issues will be linked here as they are created.

  • Implement A2A JSON-RPC 2.0 wire format — TBD
  • Implement A2A stdio transport — TBD
  • Implement A2A HTTP transport — TBD
  • Implement LangGraph RemoteGraph integration — TBD

Definition of Done

This Epic should be closed when:

  1. All acceptance criteria above are verified and checked off
  2. All child implementation issues are closed
  3. Test coverage >= 97% is confirmed by CI
  4. Code has passed peer review and been merged to the main branch

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

## Metadata - **Commit message**: `feat(server): implement A2A JSON-RPC 2.0 wire format and transport layers` - **Branch name**: `feat/v3.8.0-a2a-wire-format-transport` ## Background and Context As part of the v3.8.0 milestone (M9: Server Implementation) and Legendary #8676, this Epic delivers the A2A JSON-RPC 2.0 wire format and transport layers. This is the foundational communication layer for the CleverAgents server. Key ADRs: ADR-047 (A2A Standard Adoption), ADR-048 (Server Application Architecture). This Epic blocks the parent Legendary. ## Expected Behavior - A2A JSON-RPC 2.0 wire format is implemented with _cleveragents/ extension method routing - A2A stdio transport enables local mode (agent as subprocess) - A2A HTTP transport enables server mode (single JSON-RPC endpoint) - LangGraph Platform RemoteGraph integration enables server-side actor execution ## Acceptance Criteria - [ ] A2A JSON-RPC 2.0 wire format is implemented - [ ] _cleveragents/ extension method routing is functional - [ ] A2A stdio transport (local mode) is operational - [ ] A2A HTTP transport (server mode) is operational - [ ] LangGraph Platform RemoteGraph integration is functional - [ ] Integration tests verify all transport modes - [ ] `nox` passes with coverage >= 97% ## Subtasks - [ ] Implement A2A JSON-RPC 2.0 wire format - [ ] Implement _cleveragents/ extension method routing - [ ] Implement A2A stdio transport (local mode) - [ ] Implement A2A HTTP transport (server mode) - [ ] Implement LangGraph Platform RemoteGraph integration - [ ] Write integration tests for all transport modes ## Child Issues / Child Epics > Child implementation issues will be linked here as they are created. - [ ] Implement A2A JSON-RPC 2.0 wire format — _TBD_ - [ ] Implement A2A stdio transport — _TBD_ - [ ] Implement A2A HTTP transport — _TBD_ - [ ] Implement LangGraph RemoteGraph integration — _TBD_ ## Definition of Done This Epic should be closed when: 1. All acceptance criteria above are verified and checked off 2. All child implementation issues are closed 3. Test coverage >= 97% is confirmed by CI 4. Code has passed peer review and been merged to the main branch --- **Automated by CleverAgents Bot** Supervisor: Epic Planning | Agent: epic-planning-pool-supervisor
HAL9000 added this to the v3.8.0 milestone 2026-04-13 22:13:50 +00:00
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Owner

[AUTO-OWNR-1] Triage Decision (Cycle 10)

Status: Verified

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

Rationale: This is part of the v3.8.0 Server Implementation milestone. Per the milestone description: "No deadline assigned. Development effort should focus on M1-M6 milestones first." This is classified as Should Have / Medium to reflect its 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 10) **Status**: ✅ Verified **MoSCoW**: Should Have **Priority**: Medium **Milestone**: v3.8.0 **Rationale**: This is part of the v3.8.0 Server Implementation milestone. Per the milestone description: "No deadline assigned. Development effort should focus on M1-M6 milestones first." This is classified as Should Have / Medium to reflect its 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
Author
Owner

Child Issues Created for Epic #8677

All 4 child implementation issues have been created and linked to this Epic. Each child issue BLOCKS this Epic.

# Issue Branch Prefix Milestone
#8708 feat(server): implement A2A JSON-RPC 2.0 wire format with _cleveragents/ extension routing feat/v3.8.0-a2a-jsonrpc-wire-format v3.8.0
#8709 feat(server): implement A2A stdio transport for local mode (agent as subprocess) feat/v3.8.0-a2a-stdio-transport v3.8.0
#8711 feat(server): implement A2A HTTP transport for server mode (single JSON-RPC endpoint) feat/v3.8.0-a2a-http-transport v3.8.0
#8714 feat(server): implement LangGraph Platform RemoteGraph integration for server-side actor execution feat/v3.8.0-langgraph-remotegraph-integration v3.8.0

Labels applied to all child issues: Type/Feature, Priority/High, MoSCoW/Should have, State/Verified


Automated by CleverAgents Bot
Agent: new-issue-creator

## Child Issues Created for Epic #8677 All 4 child implementation issues have been created and linked to this Epic. Each child issue BLOCKS this Epic. | # | Issue | Branch Prefix | Milestone | |---|-------|---------------|-----------| | #8708 | feat(server): implement A2A JSON-RPC 2.0 wire format with _cleveragents/ extension routing | `feat/v3.8.0-a2a-jsonrpc-wire-format` | v3.8.0 | | #8709 | feat(server): implement A2A stdio transport for local mode (agent as subprocess) | `feat/v3.8.0-a2a-stdio-transport` | v3.8.0 | | #8711 | feat(server): implement A2A HTTP transport for server mode (single JSON-RPC endpoint) | `feat/v3.8.0-a2a-http-transport` | v3.8.0 | | #8714 | feat(server): implement LangGraph Platform RemoteGraph integration for server-side actor execution | `feat/v3.8.0-langgraph-remotegraph-integration` | v3.8.0 | **Labels applied to all child issues:** `Type/Feature`, `Priority/High`, `MoSCoW/Should have`, `State/Verified` --- **Automated by CleverAgents Bot** Agent: new-issue-creator
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cleveragents/cleveragents-core#8677
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