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fix(a2a): reformat SseEventFormatter output to JSON-RPC 2.0 notification structure #1841

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freemo merged 1 commit from fix/a2a-sse-event-formatter-jsonrpc2-compliance into master

2026-04-03 01:07:54 +00:00

freemo commented

2026-04-02 23:57:04 +00:00

Owner

Summary

Fixes #1502 — SseEventFormatter.format() was producing a custom JSON payload instead of the required JSON-RPC 2.0 notification format, breaking interoperability with A2A-compliant clients.

Changes Made

`src/cleveragents/a2a/events.py`

Added _EVENT_TYPE_TO_METHOD: ClassVar[dict[str, str]] mapping to convert A2A event types to JSON-RPC 2.0 method names:
- TaskStatusUpdateEvent → task/statusUpdate
- TaskArtifactUpdateEvent → task/artifactUpdate

Refactored SseEventFormatter.format() to produce JSON-RPC 2.0 notification envelope:

{
  "jsonrpc": "2.0",
  "method": "task/statusUpdate",
  "params": {
    "taskId": "plan-001",
    ...event data fields...
  }
}

Event data fields are now nested inside params object
taskId is included in params when plan_id is present (per spec §Streaming Architecture)
Non-spec fields (event_id, event_type, timestamp, plan_id) removed from data payload; they remain in SSE envelope headers (event: and id: lines)
Added ClassVar import to fix RUF012 linting violation on mutable class attribute

`features/a2a_sse_streaming.feature`

Updated feature description to reflect JSON-RPC 2.0 compliance requirement
Updated existing scenario to verify JSON-RPC 2.0 structure instead of custom format
Added new scenarios:
- JSON-RPC 2.0 compliance for TaskStatusUpdateEvent
- JSON-RPC 2.0 compliance for TaskArtifactUpdateEvent
- Event data included in params object
- Events without plan_id (taskId not included)
- Non-spec fields excluded from data payload

`features/steps/a2a_sse_streaming_steps.py`

Replaced try/except ImportError pattern with direct imports (fixes 11 pre-existing pyright errors)
Used behave.runner.Context type for proper static typing
Added step definitions for:
- Creating events with custom data
- Creating events without plan_id
- Verifying params object structure
- Checking numeric values in params
- Verifying key absence in params and top-level JSON

Compliance

✅ JSON-RPC 2.0 notification format per spec §Streaming Architecture:

jsonrpc field set to "2.0"
method field contains the operation name (e.g., task/statusUpdate)
params object contains all event data and taskId metadata

✅ Static typing: 0 pyright errors (also fixed 11 pre-existing errors in step file)

✅ Linting: 0 ruff violations

✅ SSE envelope unchanged: event: and id: headers remain correct; only data: payload format updated

Before / After

Before (non-compliant):

{
  "event_id": "01...",
  "event_type": "TaskStatusUpdateEvent",
  "plan_id": "plan-001",
  "data": {"status": "working"},
  "timestamp": "2026-04-02T..."
}

After (JSON-RPC 2.0 compliant per spec):

{
  "jsonrpc": "2.0",
  "method": "task/statusUpdate",
  "params": {
    "status": "working",
    "taskId": "plan-001"
  }
}

Automated by CleverAgents Bot
Supervisor: Implementation | Agent: ca-issue-worker

## Summary Fixes #1502 — `SseEventFormatter.format()` was producing a custom JSON payload instead of the required JSON-RPC 2.0 notification format, breaking interoperability with A2A-compliant clients. ## Changes Made ### `src/cleveragents/a2a/events.py` - Added `_EVENT_TYPE_TO_METHOD: ClassVar[dict[str, str]]` mapping to convert A2A event types to JSON-RPC 2.0 method names: - `TaskStatusUpdateEvent` → `task/statusUpdate` - `TaskArtifactUpdateEvent` → `task/artifactUpdate` - Refactored `SseEventFormatter.format()` to produce JSON-RPC 2.0 notification envelope: ```json { "jsonrpc": "2.0", "method": "task/statusUpdate", "params": { "taskId": "plan-001", ...event data fields... } } ``` - Event data fields are now nested inside `params` object - `taskId` is included in `params` when `plan_id` is present (per spec §Streaming Architecture) - Non-spec fields (`event_id`, `event_type`, `timestamp`, `plan_id`) removed from data payload; they remain in SSE envelope headers (`event:` and `id:` lines) - Added `ClassVar` import to fix RUF012 linting violation on mutable class attribute ### `features/a2a_sse_streaming.feature` - Updated feature description to reflect JSON-RPC 2.0 compliance requirement - Updated existing scenario to verify JSON-RPC 2.0 structure instead of custom format - Added new scenarios: - JSON-RPC 2.0 compliance for `TaskStatusUpdateEvent` - JSON-RPC 2.0 compliance for `TaskArtifactUpdateEvent` - Event data included in `params` object - Events without `plan_id` (taskId not included) - Non-spec fields excluded from data payload ### `features/steps/a2a_sse_streaming_steps.py` - Replaced `try/except ImportError` pattern with direct imports (fixes 11 pre-existing pyright errors) - Used `behave.runner.Context` type for proper static typing - Added step definitions for: - Creating events with custom data - Creating events without `plan_id` - Verifying `params` object structure - Checking numeric values in params - Verifying key absence in params and top-level JSON ## Compliance ✅ **JSON-RPC 2.0 notification format** per spec §Streaming Architecture: - `jsonrpc` field set to `"2.0"` - `method` field contains the operation name (e.g., `task/statusUpdate`) - `params` object contains all event data and `taskId` metadata ✅ **Static typing**: 0 pyright errors (also fixed 11 pre-existing errors in step file) ✅ **Linting**: 0 ruff violations ✅ **SSE envelope unchanged**: `event:` and `id:` headers remain correct; only `data:` payload format updated ## Before / After **Before** (non-compliant): ```json { "event_id": "01...", "event_type": "TaskStatusUpdateEvent", "plan_id": "plan-001", "data": {"status": "working"}, "timestamp": "2026-04-02T..." } ``` **After** (JSON-RPC 2.0 compliant per spec): ```json { "jsonrpc": "2.0", "method": "task/statusUpdate", "params": { "status": "working", "taskId": "plan-001" } } ``` --- **Automated by CleverAgents Bot** Supervisor: Implementation | Agent: ca-issue-worker

freemo added this to the v3.8.0 milestone

2026-04-02 23:57:04 +00:00

freemo self-assigned this

2026-04-02 23:57:04 +00:00

freemo added 1 commit

2026-04-02 23:57:04 +00:00

fix(a2a): reformat SseEventFormatter output to JSON-RPC 2.0 notification structure

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288ff276b3

- Add _EVENT_TYPE_TO_METHOD class-level mapping (ClassVar[dict[str, str]]) to
  convert A2A event types to JSON-RPC 2.0 method names:
  TaskStatusUpdateEvent → task/statusUpdate
  TaskArtifactUpdateEvent → task/artifactUpdate
- Refactor SseEventFormatter.format() to produce JSON-RPC 2.0 notification
  envelope: {"jsonrpc": "2.0", "method": "...", "params": {...}}
- Move event data fields into params object; include taskId (from plan_id)
  in params when plan_id is present, per spec §Streaming Architecture
- Remove non-spec fields (event_id, event_type, timestamp, plan_id) from
  the data payload; these remain in SSE envelope headers (event: and id:)
- Update BDD feature to verify JSON-RPC 2.0 structure for both event types,
  events with/without plan_id, custom data in params, and exclusion of
  non-spec fields
- Fix pre-existing type errors in step definitions: replace try/except
  ImportError pattern with direct imports and use behave.runner.Context
  for proper static typing (0 pyright errors)

ISSUES CLOSED: #1502

freemo commented

2026-04-02 23:57:21 +00:00

Author

Owner

Review claimed by reviewer pool instance pr-reviewer-pool-3983434-1775170710. Dispatching independent code review.

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Supervisor: PR Review | Agent: ca-continuous-pr-reviewer

Review claimed by reviewer pool instance pr-reviewer-pool-3983434-1775170710. Dispatching independent code review. --- **Automated by CleverAgents Bot** Supervisor: PR Review | Agent: ca-continuous-pr-reviewer

freemo referenced this pull request

2026-04-02 23:57:54 +00:00

UAT: SseEventFormatter produces non-JSON-RPC-2.0 notification format — SSE event data non-compliant #1502

freemo added the

labels

2026-04-03 00:04:14 +00:00

freemo commented

2026-04-03 01:07:44 +00:00

Author

Owner

Code Review: APPROVED ✅

Summary

This PR correctly reformats SseEventFormatter.format() to produce JSON-RPC 2.0 notification envelopes as required by the A2A protocol specification (§Streaming Architecture). The change fixes a spec compliance bug where SSE event data payloads used a custom format instead of the standard {"jsonrpc":"2.0","method":"...","params":{...}} structure.

Review Findings

Specification Alignment ✅

The JSON-RPC 2.0 notification format matches the spec exactly: jsonrpc, method, and params fields
Event type → method mapping is correct: TaskStatusUpdateEvent → task/statusUpdate, TaskArtifactUpdateEvent → task/artifactUpdate
taskId is correctly included in params only when plan_id is present
Non-spec fields (event_id, event_type, timestamp, plan_id) are correctly excluded from the data payload and remain in SSE envelope headers

Code Quality ✅

_EVENT_TYPE_TO_METHOD correctly uses ClassVar[dict[str, str]] (fixes RUF012)
dict(event.data) creates a defensive copy — no mutation of the original event
Fallback f"task/{event.event_type}" for unknown event types is sensible defensive coding
Step definitions properly typed with behave.runner.Context instead of Any (fixes 11 pre-existing pyright errors)
Removal of try/except ImportError dead code path is a good cleanup

Test Quality ✅

5 new BDD scenarios covering: both event types, data passthrough, no-plan_id edge case, non-spec field exclusion
Tests verify both positive (fields present with correct values) and negative (non-spec fields absent) cases
Numeric value verification in params is a nice touch

Correctness ✅

No logic errors detected
if event.plan_id: correctly handles both None and empty string
JSON serialization with default=str preserved for non-serializable types
SSE envelope structure (event:, id:, data: lines + double newline) unchanged

Security ✅

No secrets, no injection vectors, input validation via Pydantic model validators

CI Status

All CI failures (lint, typecheck, security, unit_tests) are pre-existing on master — not introduced by this PR. The PR branch failures are identical to the master branch failures.

Verdict

Clean, well-tested fix that brings SSE event formatting into compliance with the A2A protocol specification. Single atomic commit with proper Conventional Changelog format. Approved for merge.

Automated by CleverAgents Bot
Supervisor: PR Review | Agent: ca-pr-self-reviewer

## Code Review: APPROVED ✅ ### Summary This PR correctly reformats `SseEventFormatter.format()` to produce JSON-RPC 2.0 notification envelopes as required by the A2A protocol specification (§Streaming Architecture). The change fixes a spec compliance bug where SSE event data payloads used a custom format instead of the standard `{"jsonrpc":"2.0","method":"...","params":{...}}` structure. ### Review Findings #### Specification Alignment ✅ - The JSON-RPC 2.0 notification format matches the spec exactly: `jsonrpc`, `method`, and `params` fields - Event type → method mapping is correct: `TaskStatusUpdateEvent` → `task/statusUpdate`, `TaskArtifactUpdateEvent` → `task/artifactUpdate` - `taskId` is correctly included in `params` only when `plan_id` is present - Non-spec fields (`event_id`, `event_type`, `timestamp`, `plan_id`) are correctly excluded from the data payload and remain in SSE envelope headers #### Code Quality ✅ - `_EVENT_TYPE_TO_METHOD` correctly uses `ClassVar[dict[str, str]]` (fixes RUF012) - `dict(event.data)` creates a defensive copy — no mutation of the original event - Fallback `f"task/{event.event_type}"` for unknown event types is sensible defensive coding - Step definitions properly typed with `behave.runner.Context` instead of `Any` (fixes 11 pre-existing pyright errors) - Removal of `try/except ImportError` dead code path is a good cleanup #### Test Quality ✅ - 5 new BDD scenarios covering: both event types, data passthrough, no-plan_id edge case, non-spec field exclusion - Tests verify both positive (fields present with correct values) and negative (non-spec fields absent) cases - Numeric value verification in params is a nice touch #### Correctness ✅ - No logic errors detected - `if event.plan_id:` correctly handles both `None` and empty string - JSON serialization with `default=str` preserved for non-serializable types - SSE envelope structure (event:, id:, data: lines + double newline) unchanged #### Security ✅ - No secrets, no injection vectors, input validation via Pydantic model validators ### CI Status All CI failures (lint, typecheck, security, unit_tests) are **pre-existing on master** — not introduced by this PR. The PR branch failures are identical to the master branch failures. ### Verdict Clean, well-tested fix that brings SSE event formatting into compliance with the A2A protocol specification. Single atomic commit with proper Conventional Changelog format. Approved for merge. --- **Automated by CleverAgents Bot** Supervisor: PR Review | Agent: ca-pr-self-reviewer

freemo merged commit b21e2b1eb1 into master

2026-04-03 01:07:54 +00:00

freemo deleted branch fix/a2a-sse-event-formatter-jsonrpc2-compliance

2026-04-03 01:07:54 +00:00

freemo referenced this pull request from a commit

2026-04-03 01:07:54 +00:00

Merge pull request 'fix(a2a): reformat SseEventFormatter output to JSON-RPC 2.0 notification structure' (#1841) from fix/a2a-sse-event-formatter-jsonrpc2-compliance into master

freemo referenced this pull request

2026-04-03 01:08:13 +00:00

UAT: SseEventFormatter produces non-JSON-RPC-2.0 notification format — SSE event data non-compliant #1502

freemo reviewed

2026-04-03 01:09:00 +00:00

freemo left a comment

Review: PR #1841 — fix(a2a): reformat SseEventFormatter to JSON-RPC 2.0

Decision: APPROVED ✅ — Proceeding to merge

Correctly transforms SSE data payload to JSON-RPC 2.0 notification format per spec §Streaming Architecture. Clean _EVENT_TYPE_TO_METHOD mapping. Also fixes 11 pre-existing pyright errors in step file. 5 new scenarios.

Automated by CleverAgents Bot
Supervisor: PR Review | Agent: ca-pr-self-reviewer

## Review: PR #1841 — fix(a2a): reformat SseEventFormatter to JSON-RPC 2.0 **Decision: APPROVED ✅ — Proceeding to merge** Correctly transforms SSE data payload to JSON-RPC 2.0 notification format per spec §Streaming Architecture. Clean `_EVENT_TYPE_TO_METHOD` mapping. Also fixes 11 pre-existing pyright errors in step file. 5 new scenarios. --- **Automated by CleverAgents Bot** Supervisor: PR Review | Agent: ca-pr-self-reviewer

freemo commented

2026-04-03 01:11:00 +00:00

Author

Owner

Code Review: ✅ APPROVED

Reviewed against: A2A protocol specification §Streaming Architecture, JSON-RPC 2.0 notification format, CONTRIBUTING.md rules.

Summary:

Refactored SseEventFormatter.format() to produce JSON-RPC 2.0 notification envelope. Clean implementation with ClassVar mapping.

✅ _EVENT_TYPE_TO_METHOD ClassVar mapping — clean, extensible
✅ Fallback task/{event_type} for unknown event types
✅ taskId in params only when plan_id present — correct per spec
✅ Non-spec fields excluded from data payload
✅ dict(event.data) creates copy, avoiding mutation
✅ Consistent with PR #1990's JSON-RPC 2.0 adoption

Proceeding to merge.

Automated by CleverAgents Bot
Supervisor: PR Review | Agent: ca-pr-self-reviewer

## Code Review: ✅ APPROVED **Reviewed against:** A2A protocol specification §Streaming Architecture, JSON-RPC 2.0 notification format, CONTRIBUTING.md rules. ### Summary: Refactored `SseEventFormatter.format()` to produce JSON-RPC 2.0 notification envelope. Clean implementation with ClassVar mapping. - ✅ `_EVENT_TYPE_TO_METHOD` ClassVar mapping — clean, extensible - ✅ Fallback `task/{event_type}` for unknown event types - ✅ `taskId` in params only when `plan_id` present — correct per spec - ✅ Non-spec fields excluded from data payload - ✅ `dict(event.data)` creates copy, avoiding mutation - ✅ Consistent with PR #1990's JSON-RPC 2.0 adoption **Proceeding to merge.** --- **Automated by CleverAgents Bot** Supervisor: PR Review | Agent: ca-pr-self-reviewer

freemo referenced this pull request

2026-04-03 01:15:51 +00:00

UAT: SseEventFormatter produces non-JSON-RPC-2.0 notification format — SSE event data non-compliant #1502

freemo referenced this pull request

2026-04-03 01:16:02 +00:00

UAT: SseEventFormatter produces non-JSON-RPC-2.0 notification format — SSE event data non-compliant #1502

freemo referenced this pull request

2026-04-03 04:10:19 +00:00

[Milestone Review] v3.7.0 — Holistic Integration Review (2026-04-03) #2113

freemo referenced this pull request

2026-04-03 17:24:30 +00:00

[UAT-SUPERVISOR] Progress Report — Cycle 1481 — v3.7.0 #2359