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UAT: ASGI app (`cleveragents.a2a.asgi:app`) missing A2A JSON-RPC endpoint and SSE streaming endpoint — only health probes implemented #2156

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opened 2026-04-03 04:31:06 +00:00 by freemo · 4 comments

freemo commented

2026-04-03 04:31:06 +00:00

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Branch: bugfix/a2a-asgi-jsonrpc-and-sse-endpoints
Commit Message: fix(a2a): wire A2A JSON-RPC dispatch and SSE streaming endpoints into ASGI app
Milestone: v3.7.0
Parent Epic: #933

Background and Context

Code-level UAT analysis of src/cleveragents/a2a/asgi.py — the ASGI application used for server mode deployment via agents server serve — revealed that the app exposes only health probe endpoints. The A2A JSON-RPC dispatch endpoint and SSE streaming endpoint required by the specification are entirely absent.

Per docs/specification.md §Server and Client Architecture, all client-server communication is handled exclusively through the A2A protocol over HTTP. The ASGI app is the HTTP entry point for server mode and must therefore expose:

A A2A JSON-RPC endpoint (POST /) that accepts JSON-RPC 2.0 requests and routes them through A2aLocalFacade.dispatch()
An SSE streaming endpoint (GET /events or GET /stream) that streams entity/updated and task status events to connected clients using text/event-stream content type, with namespace-scoped subscriptions

The SseEventFormatter and A2aEventQueue classes exist in src/cleveragents/a2a/events.py and A2aLocalFacade.dispatch() exists in src/cleveragents/a2a/facade.py, but neither is wired into the ASGI app. The _KNOWN_PATHS set (line 18) only contains {"/", "/live", "/ready", "/health"} — no A2A or SSE paths are registered.

What Was Tested

Code-level analysis of src/cleveragents/a2a/asgi.py — the ASGI application used for server mode deployment via agents server serve.

Expected Behavior (from spec)

In server mode, the ASGI application must expose:

A2A JSON-RPC endpoint (e.g., POST /) that accepts JSON-RPC 2.0 requests and routes them through the A2aLocalFacade dispatch mechanism
SSE streaming endpoint (e.g., GET /events or GET /stream) that streams entity/updated and task status events to connected clients using text/event-stream content type
The SSE endpoint must support namespace-scoped subscriptions so clients only receive events for their subscribed namespaces

Actual Behavior

The ASGI app in src/cleveragents/a2a/asgi.py only implements health probe endpoints:

GET /live → {"status":"alive"}
GET /ready → {"status":"ready"}
GET /health → {"status":"ok"}
GET / → {"service":"cleveragents"}

There is no A2A JSON-RPC endpoint (POST / or POST /a2a) that would accept and dispatch A2A requests. There is no SSE streaming endpoint for entity synchronization events. The SseEventFormatter and A2aEventQueue classes exist in events.py but are never wired into the ASGI app.

The _KNOWN_PATHS set (line 18) only contains {"/", "/live", "/ready", "/health"} — no A2A or SSE paths.

Code Locations

src/cleveragents/a2a/asgi.py lines 18-19: _KNOWN_PATHS only has health probe paths
src/cleveragents/a2a/asgi.py lines 60-100: app() function only handles health probes
src/cleveragents/a2a/events.py: SseEventFormatter and A2aEventQueue exist but are not wired into ASGI app
src/cleveragents/a2a/facade.py: A2aLocalFacade.dispatch() exists but is not called from ASGI app

Steps to Reproduce

Start the ASGI server and attempt an A2A request:

# Start server
agents server serve --port 8000

# Attempt A2A request — should return JSON-RPC 2.0 response
curl -X POST http://localhost:8000/ \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":"1","method":"_cleveragents/health/check","params":{}}'
# ACTUAL: Returns 404 {"error":"not found"} instead of A2A response

# Attempt SSE subscription — should stream entity events
curl -H "Accept: text/event-stream" http://localhost:8000/events
# ACTUAL: Returns 404 {"error":"not found"}

Severity

Critical — Without the A2A JSON-RPC endpoint and SSE streaming endpoint, the server mode is completely non-functional. Clients cannot communicate with the server at all, and entity synchronization via SSE is impossible.

Subtasks

Write failing Behave scenario (@tdd_expected_fail) reproducing the missing POST / A2A JSON-RPC endpoint (TDD — must be merged before fix)
Write failing Behave scenario reproducing the missing GET /events SSE streaming endpoint (TDD — must be merged before fix)
Add POST / (or POST /a2a) route to _KNOWN_PATHS and app() in src/cleveragents/a2a/asgi.py
Wire A2aLocalFacade.dispatch() into the new POST / handler — parse JSON-RPC 2.0 request body, call dispatch(), return JSON-RPC 2.0 response
Add GET /events (or GET /stream) route to _KNOWN_PATHS and app() in src/cleveragents/a2a/asgi.py
Wire A2aEventQueue and SseEventFormatter from src/cleveragents/a2a/events.py into the new GET /events handler — stream events as text/event-stream
Implement namespace-scoped subscription filtering in the SSE handler (clients subscribe to specific namespaces)
Ensure all new handler code is fully statically typed (no # type: ignore, passes nox -e typecheck)
Ensure all public/protected methods validate arguments as the first step (fail-fast)
Write Behave feature file features/a2a/asgi_endpoints.feature covering: A2A JSON-RPC dispatch (happy path + error cases), SSE streaming (connection, event delivery, namespace filtering)
Write Behave step definitions in features/steps/ for the new scenarios
Add Robot Framework integration test in robot/ covering end-to-end A2A request via ASGI
Run nox -e lint and fix any issues
Run nox -e typecheck and fix any Pyright errors
Run nox -e unit_tests and confirm all scenarios pass
Run nox -e integration_tests and confirm all Robot tests pass
Run nox -e coverage_report and confirm coverage >= 97%
Run full nox suite and confirm all default sessions pass

Definition of Done

All subtasks above are checked off
POST / (or POST /a2a) in the ASGI app accepts JSON-RPC 2.0 requests and routes them through A2aLocalFacade.dispatch(), returning a valid JSON-RPC 2.0 response
GET /events (or GET /stream) in the ASGI app streams events as text/event-stream using SseEventFormatter and A2aEventQueue, with namespace-scoped subscription support
_KNOWN_PATHS is updated to include the new A2A and SSE paths
All new code is fully statically typed and passes Pyright with no suppressions
Failing Behave tests existed before the fix (TDD)
All Behave scenarios pass after the fix
Robot Framework integration test passes end-to-end
Commit fix(a2a): wire A2A JSON-RPC dispatch and SSE streaming endpoints into ASGI app is made on branch bugfix/a2a-asgi-jsonrpc-and-sse-endpoints with footer ISSUES CLOSED: #<this issue>
A PR is opened, reviewed (≥2 approvals), and merged
All nox stages pass
Coverage >= 97%

Automated by CleverAgents Bot
Supervisor: UAT Testing | Agent: ca-new-issue-creator

## Metadata - **Branch**: `bugfix/a2a-asgi-jsonrpc-and-sse-endpoints` - **Commit Message**: `fix(a2a): wire A2A JSON-RPC dispatch and SSE streaming endpoints into ASGI app` - **Milestone**: v3.7.0 - **Parent Epic**: #933 ## Background and Context Code-level UAT analysis of `src/cleveragents/a2a/asgi.py` — the ASGI application used for server mode deployment via `agents server serve` — revealed that the app exposes **only health probe endpoints**. The A2A JSON-RPC dispatch endpoint and SSE streaming endpoint required by the specification are entirely absent. Per `docs/specification.md` §Server and Client Architecture, all client-server communication is handled exclusively through the A2A protocol over HTTP. The ASGI app is the HTTP entry point for server mode and must therefore expose: 1. A **A2A JSON-RPC endpoint** (`POST /`) that accepts JSON-RPC 2.0 requests and routes them through `A2aLocalFacade.dispatch()` 2. An **SSE streaming endpoint** (`GET /events` or `GET /stream`) that streams `entity/updated` and task status events to connected clients using `text/event-stream` content type, with namespace-scoped subscriptions The `SseEventFormatter` and `A2aEventQueue` classes exist in `src/cleveragents/a2a/events.py` and `A2aLocalFacade.dispatch()` exists in `src/cleveragents/a2a/facade.py`, but neither is wired into the ASGI app. The `_KNOWN_PATHS` set (line 18) only contains `{"/", "/live", "/ready", "/health"}` — no A2A or SSE paths are registered. ## What Was Tested Code-level analysis of `src/cleveragents/a2a/asgi.py` — the ASGI application used for server mode deployment via `agents server serve`. ## Expected Behavior (from spec) In server mode, the ASGI application must expose: 1. **A2A JSON-RPC endpoint** (e.g., `POST /`) that accepts JSON-RPC 2.0 requests and routes them through the `A2aLocalFacade` dispatch mechanism 2. **SSE streaming endpoint** (e.g., `GET /events` or `GET /stream`) that streams `entity/updated` and task status events to connected clients using `text/event-stream` content type 3. The SSE endpoint must support namespace-scoped subscriptions so clients only receive events for their subscribed namespaces ## Actual Behavior The ASGI app in `src/cleveragents/a2a/asgi.py` only implements health probe endpoints: - `GET /live` → `{"status":"alive"}` - `GET /ready` → `{"status":"ready"}` - `GET /health` → `{"status":"ok"}` - `GET /` → `{"service":"cleveragents"}` There is **no A2A JSON-RPC endpoint** (`POST /` or `POST /a2a`) that would accept and dispatch A2A requests. There is **no SSE streaming endpoint** for entity synchronization events. The `SseEventFormatter` and `A2aEventQueue` classes exist in `events.py` but are never wired into the ASGI app. The `_KNOWN_PATHS` set (line 18) only contains `{"/", "/live", "/ready", "/health"}` — no A2A or SSE paths. ## Code Locations - `src/cleveragents/a2a/asgi.py` lines 18-19: `_KNOWN_PATHS` only has health probe paths - `src/cleveragents/a2a/asgi.py` lines 60-100: `app()` function only handles health probes - `src/cleveragents/a2a/events.py`: `SseEventFormatter` and `A2aEventQueue` exist but are not wired into ASGI app - `src/cleveragents/a2a/facade.py`: `A2aLocalFacade.dispatch()` exists but is not called from ASGI app ## Steps to Reproduce Start the ASGI server and attempt an A2A request: ```bash # Start server agents server serve --port 8000 # Attempt A2A request — should return JSON-RPC 2.0 response curl -X POST http://localhost:8000/ \ -H "Content-Type: application/json" \ -d '{"jsonrpc":"2.0","id":"1","method":"_cleveragents/health/check","params":{}}' # ACTUAL: Returns 404 {"error":"not found"} instead of A2A response # Attempt SSE subscription — should stream entity events curl -H "Accept: text/event-stream" http://localhost:8000/events # ACTUAL: Returns 404 {"error":"not found"} ``` ## Severity **Critical** — Without the A2A JSON-RPC endpoint and SSE streaming endpoint, the server mode is completely non-functional. Clients cannot communicate with the server at all, and entity synchronization via SSE is impossible. ## Subtasks - [ ] Write failing Behave scenario (`@tdd_expected_fail`) reproducing the missing `POST /` A2A JSON-RPC endpoint (TDD — must be merged before fix) - [ ] Write failing Behave scenario reproducing the missing `GET /events` SSE streaming endpoint (TDD — must be merged before fix) - [ ] Add `POST /` (or `POST /a2a`) route to `_KNOWN_PATHS` and `app()` in `src/cleveragents/a2a/asgi.py` - [ ] Wire `A2aLocalFacade.dispatch()` into the new `POST /` handler — parse JSON-RPC 2.0 request body, call `dispatch()`, return JSON-RPC 2.0 response - [ ] Add `GET /events` (or `GET /stream`) route to `_KNOWN_PATHS` and `app()` in `src/cleveragents/a2a/asgi.py` - [ ] Wire `A2aEventQueue` and `SseEventFormatter` from `src/cleveragents/a2a/events.py` into the new `GET /events` handler — stream events as `text/event-stream` - [ ] Implement namespace-scoped subscription filtering in the SSE handler (clients subscribe to specific namespaces) - [ ] Ensure all new handler code is fully statically typed (no `# type: ignore`, passes `nox -e typecheck`) - [ ] Ensure all public/protected methods validate arguments as the first step (fail-fast) - [ ] Write Behave feature file `features/a2a/asgi_endpoints.feature` covering: A2A JSON-RPC dispatch (happy path + error cases), SSE streaming (connection, event delivery, namespace filtering) - [ ] Write Behave step definitions in `features/steps/` for the new scenarios - [ ] Add Robot Framework integration test in `robot/` covering end-to-end A2A request via ASGI - [ ] Run `nox -e lint` and fix any issues - [ ] Run `nox -e typecheck` and fix any Pyright errors - [ ] Run `nox -e unit_tests` and confirm all scenarios pass - [ ] Run `nox -e integration_tests` and confirm all Robot tests pass - [ ] Run `nox -e coverage_report` and confirm coverage >= 97% - [ ] Run full `nox` suite and confirm all default sessions pass ## Definition of Done - [ ] All subtasks above are checked off - [ ] `POST /` (or `POST /a2a`) in the ASGI app accepts JSON-RPC 2.0 requests and routes them through `A2aLocalFacade.dispatch()`, returning a valid JSON-RPC 2.0 response - [ ] `GET /events` (or `GET /stream`) in the ASGI app streams events as `text/event-stream` using `SseEventFormatter` and `A2aEventQueue`, with namespace-scoped subscription support - [ ] `_KNOWN_PATHS` is updated to include the new A2A and SSE paths - [ ] All new code is fully statically typed and passes Pyright with no suppressions - [ ] Failing Behave tests existed before the fix (TDD) - [ ] All Behave scenarios pass after the fix - [ ] Robot Framework integration test passes end-to-end - [ ] Commit `fix(a2a): wire A2A JSON-RPC dispatch and SSE streaming endpoints into ASGI app` is made on branch `bugfix/a2a-asgi-jsonrpc-and-sse-endpoints` with footer `ISSUES CLOSED: #<this issue>` - [ ] A PR is opened, reviewed (≥2 approvals), and merged - [ ] All nox stages pass - [ ] Coverage >= 97% --- **Automated by CleverAgents Bot** Supervisor: UAT Testing | Agent: ca-new-issue-creator

freemo added this to the v3.7.0 milestone

2026-04-03 04:31:10 +00:00

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2026-04-03 04:31:47 +00:00

[UAT-SUPERVISOR] Progress Report — Cycle 731 — v3.7.0 #2157

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2026-04-03 04:32:08 +00:00

[CA-AUTO] UAT Pool Supervisor — v3.7.0 — Session Tracker #2023

freemo added a new dependency

2026-04-03 04:32:11 +00:00

#933 Epic: A2A Protocol Compliance — JSON-RPC 2.0 Framing, Standard Operations, and Extension Methods

freemo referenced this issue

2026-04-03 04:33:34 +00:00

UAT: cleveragents.a2a.asgi:app ASGI application only serves health probe endpoints — missing the A2A JSON-RPC 2.0 endpoint required for server mode #2159

freemo commented

2026-04-03 04:33:40 +00:00

Author

Owner

Issue triaged by project owner:

State: Verified
Priority: Critical (confirmed) — The ASGI application cannot process any A2A requests. Server mode is completely non-functional for agent communication. However, this is a known stub — the milestone description explicitly states server mode is deferred to M9 (v3.8.0).
Milestone: v3.7.0 (already assigned, though this is arguably v3.8.0 scope since server mode is deferred)
MoSCoW: Should Have — While Critical in severity, the server mode is explicitly deferred per milestone descriptions ("Development effort should focus on M1-M6 milestones first"). This is important for eventual server implementation but not blocking current work.
Parent Epic: #933 (confirmed correct)

Note: #2159 was closed as a duplicate of this issue.

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

Issue triaged by project owner: - **State**: Verified - **Priority**: Critical (confirmed) — The ASGI application cannot process any A2A requests. Server mode is completely non-functional for agent communication. However, this is a **known stub** — the milestone description explicitly states server mode is deferred to M9 (v3.8.0). - **Milestone**: v3.7.0 (already assigned, though this is arguably v3.8.0 scope since server mode is deferred) - **MoSCoW**: Should Have — While Critical in severity, the server mode is explicitly deferred per milestone descriptions ("Development effort should focus on M1-M6 milestones first"). This is important for eventual server implementation but not blocking current work. - **Parent Epic**: #933 (confirmed correct) Note: #2159 was closed as a duplicate of this issue. --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: ca-project-owner

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2026-04-03 04:40:28 +00:00

[CA-AUTO] UAT Pool Supervisor — v3.7.0 — Session Tracker #2023

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2026-04-03 04:41:54 +00:00

[UAT-SUPERVISOR] Progress Report — Cycle 741 — v3.7.0 #2169

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[UAT-SUPERVISOR] Progress Report — Cycle 751 — v3.7.0 #2171

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[UAT-SUPERVISOR] Progress Report — Cycle 761 — v3.7.0 #2172

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[UAT-SUPERVISOR] Progress Report — Cycle 771 — v3.7.0 #2173

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[UAT-SUPERVISOR] Progress Report — Cycle 781 — v3.7.0 #2174

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[UAT-SUPERVISOR] Progress Report — Cycle 791 — v3.7.0 #2175

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[UAT-SUPERVISOR] Progress Report — Cycle 801 — v3.7.0 #2176

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[UAT-SUPERVISOR] Progress Report — Cycle 821 — v3.7.0 #2179

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[UAT-SUPERVISOR] Progress Report — Cycle 831 — v3.7.0 #2182

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[UAT-SUPERVISOR] Progress Report — Cycle 841 — v3.7.0 #2183

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[UAT-SUPERVISOR] Progress Report — Cycle 851 — v3.7.0 #2184

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[UAT-SUPERVISOR] Progress Report — Cycle 861 — v3.7.0 #2185

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[UAT-SUPERVISOR] Progress Report — Cycle 871 — v3.7.0 #2186

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[UAT-SUPERVISOR] Progress Report — Cycle 881 — v3.7.0 #2187

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[UAT-SUPERVISOR] Progress Report — Cycle 891 — v3.7.0 #2188

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[UAT-SUPERVISOR] Progress Report — Cycle 901 — v3.7.0 #2189

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[UAT-SUPERVISOR] Progress Report — Cycle 911 — v3.7.0 #2190

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[UAT-SUPERVISOR] Progress Report — Cycle 921 — v3.7.0 #2191

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[UAT-SUPERVISOR] Progress Report — Cycle 931 — v3.7.0 #2192

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[UAT-SUPERVISOR] Progress Report — Cycle 941 — v3.7.0 #2193

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[UAT-SUPERVISOR] Progress Report — Cycle 961 — v3.7.0 #2195

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[UAT-SUPERVISOR] Progress Report — Cycle 971 — v3.7.0 #2196

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[UAT-SUPERVISOR] Progress Report — Cycle 981 — v3.7.0 #2197

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[UAT-SUPERVISOR] Progress Report — Cycle 991 — v3.7.0 #2198

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[UAT-SUPERVISOR] Progress Report — Cycle 1001 — v3.7.0 #2199

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[UAT-SUPERVISOR] Progress Report — Cycle 1011 — v3.7.0 #2200

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[UAT-SUPERVISOR] Progress Report — Cycle 1021 — v3.7.0 #2201

freemo self-assigned this

2026-04-03 16:58:00 +00:00

freemo commented

2026-04-03 18:43:16 +00:00

Author

Owner

Starting implementation on branch bugfix/a2a-asgi-jsonrpc-and-sse-endpoints.

Plan: 18 subtasks will be implemented in parallel waves based on dependency analysis:

Wave 1 (parallel): Subtasks 1 & 2 — Write failing TDD Behave scenarios for missing POST / JSON-RPC endpoint and GET /events SSE endpoint
Wave 2 (parallel): Subtasks 3, 4, 5, 6, 7 — Implement the actual ASGI routes (POST /, GET /events, namespace filtering, facade wiring)
Wave 3 (parallel): Subtasks 8, 9, 10, 11, 12 — Type safety, argument validation, Behave feature file, step definitions, Robot Framework integration test
Wave 4 (sequential): Subtasks 13–18 — Quality gates (lint, typecheck, unit tests, integration tests, coverage, full nox suite)

Difficulty assessment: High complexity (ASGI async streaming, JSON-RPC 2.0 protocol, SSE event streaming, namespace filtering) → starting at sonnet tier.

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

Starting implementation on branch `bugfix/a2a-asgi-jsonrpc-and-sse-endpoints`. **Plan**: 18 subtasks will be implemented in parallel waves based on dependency analysis: - **Wave 1 (parallel)**: Subtasks 1 & 2 — Write failing TDD Behave scenarios for missing POST / JSON-RPC endpoint and GET /events SSE endpoint - **Wave 2 (parallel)**: Subtasks 3, 4, 5, 6, 7 — Implement the actual ASGI routes (POST /, GET /events, namespace filtering, facade wiring) - **Wave 3 (parallel)**: Subtasks 8, 9, 10, 11, 12 — Type safety, argument validation, Behave feature file, step definitions, Robot Framework integration test - **Wave 4 (sequential)**: Subtasks 13–18 — Quality gates (lint, typecheck, unit tests, integration tests, coverage, full nox suite) Difficulty assessment: High complexity (ASGI async streaming, JSON-RPC 2.0 protocol, SSE event streaming, namespace filtering) → starting at sonnet tier. --- **Automated by CleverAgents Bot** Supervisor: Implementation | Agent: ca-issue-worker

freemo commented

2026-04-03 18:54:30 +00:00

Author

Owner

Implementation Note — Wave 1 Complete: TDD Failing Scenarios

Commit at time of writing: 77427bd7d32fd70f52d0cc392fc5043d3ace600a
Branch: bugfix/a2a-asgi-jsonrpc-and-sse-endpoints
Date: 2026-04-03

Implementation Summary

Wave 1 of the fix for this issue is complete. The goal of Wave 1 was to author all TDD failing scenarios — Behave feature scenarios tagged @tdd_expected_fail @tdd_issue @tdd_issue_2156 — that prove the absence of the A2A JSON-RPC endpoint and the SSE streaming endpoint before any production code is changed. This satisfies the TDD pre-condition stated in the issue's Definition of Done ("Failing Behave tests existed before the fix").

Two subtasks were completed:

Subtask 1 — A2A JSON-RPC endpoint scenarios (3 scenarios, 5 step definitions)
Three failing scenarios were added to features/asgi_app.feature covering the POST / A2A JSON-RPC dispatch path:

POST / accepts A2A JSON-RPC 2.0 request and returns JSON-RPC 2.0 response
POST / with invalid JSON returns 400 error
POST / with missing method field returns JSON-RPC parse error

Five new step definitions were added to features/steps/asgi_app_steps.py to support these scenarios.

Subtask 2 — SSE streaming endpoint scenarios (2 scenarios, 3 step definitions)
Two failing scenarios were added to features/asgi_app.feature covering the GET /events SSE path:

GET /events returns text/event-stream content type
GET /events is in the known paths set

Three new step definitions were added to features/steps/asgi_app_steps.py. The import in features/steps/asgi_app_steps.py was updated to include _KNOWN_PATHS from cleveragents.a2a.asgi so the "known paths" scenario can introspect the set directly.

All 5 scenarios were verified to fail correctly before any production code changes, confirming the TDD baseline is sound.

Design Decisions

Decision 1 — Reuse features/asgi_app.feature rather than creating a new feature file
The issue subtasks mention writing scenarios in features/a2a/asgi_endpoints.feature, but the existing features/asgi_app.feature already covers the ASGI app under test. Splitting into a new file at this stage would require duplicating background setup (ASGI test client instantiation) and would scatter coverage for the same module across two files. The new scenarios were co-located in the existing feature file to keep all ASGI app coverage in one place. A follow-on refactor to features/a2a/asgi_endpoints.feature can be done when the full endpoint suite is complete (Wave 2+).

Decision 2 — Tag all Wave 1 scenarios with @tdd_expected_fail @tdd_issue @tdd_issue_2156
The three tags serve distinct purposes:

@tdd_expected_fail — signals to the CI runner that these scenarios are expected to fail and should not block the build until the fix is merged.
@tdd_issue — groups all TDD-gated scenarios across the repo for bulk reporting.
@tdd_issue_2156 — provides precise traceability back to this issue so the tag can be removed atomically when the fix lands.

Decision 3 — GET /events is in the known paths set as a structural assertion
Rather than only testing the HTTP response code for GET /events, a dedicated scenario was added that directly asserts "/events" in _KNOWN_PATHS. This catches the case where a route might respond correctly but the path was never registered in _KNOWN_PATHS, which would break the 404-guard middleware. Importing _KNOWN_PATHS directly into the step definitions is intentional: it tests the module's internal contract, not just its observable HTTP behaviour.

Decision 4 — Three JSON-RPC error scenarios rather than one
The issue specifies a happy-path A2A dispatch scenario. Two additional error-path scenarios (invalid JSON body → 400, missing method field → JSON-RPC parse error) were added in Wave 1 because:

They are cheap to write at the same time as the happy-path step definitions.
They define the error-handling contract that the Wave 2 implementation must satisfy, preventing the implementer from shipping a handler that only works on well-formed input.
They will fail for the same root cause (no POST / route → 405 Method Not Allowed) until the fix is in place, so they do not add noise to the failing baseline.

Discoveries and Assumptions

Discovery 1 — POST / currently returns 405, not 404
The existing ASGI app registers GET / as a health probe. Because the path / is known but the method POST is not handled, the app returns 405 Method Not Allowed rather than 404 Not Found. The TDD scenarios were written to assert the correct post-fix behaviour (JSON-RPC 2.0 response), not to assert the current 405, so they fail cleanly for the right reason.

Discovery 2 — GET /events currently returns 404
The path /events is absent from _KNOWN_PATHS, so the 404-guard middleware intercepts the request before it reaches any handler. This is the expected pre-fix failure mode for the SSE scenarios.

Discovery 3 — _KNOWN_PATHS is a module-level set, importable for direct assertion
_KNOWN_PATHS in cleveragents.a2a.asgi is a plain set[str] defined at module scope. It is importable without instantiating the ASGI app, making it safe to assert on in a step definition without side effects.

Assumption 1 — POST / is the correct path for A2A JSON-RPC dispatch
The issue body uses POST / and POST /a2a interchangeably. The scenarios were written for POST / to match the existing GET / health probe path convention and the _KNOWN_PATHS entry for "/". If the implementer chooses POST /a2a in Wave 2, the scenarios and step definitions will need to be updated accordingly.

Assumption 2 — GET /events is the correct SSE path
The issue mentions GET /events or GET /stream. GET /events was chosen as it appears first in the issue description and is more semantically precise. This should be confirmed with the implementer before Wave 2 begins.

Open Question — Namespace-scoped SSE subscription mechanism
The issue requires namespace-scoped subscriptions for the SSE endpoint (subtask 7). No TDD scenario was written for this in Wave 1 because the subscription API (query parameter? request header? initial SSE message?) is unspecified. This must be clarified before Wave 2 SSE implementation begins.

Code Locations

All references use logical module/class/method paths. Commit: 77427bd7d32fd70f52d0cc392fc5043d3ace600a.

Artefact	Logical Location
New TDD feature scenarios (A2A JSON-RPC)	`features/asgi_app.feature` — scenarios tagged `@tdd_issue_2156`, group "A2A JSON-RPC endpoint"
New TDD feature scenarios (SSE)	`features/asgi_app.feature` — scenarios tagged `@tdd_issue_2156`, group "SSE streaming endpoint"
New step definitions (all 8)	`features/steps/asgi_app_steps.py`
`_KNOWN_PATHS` import added	`features/steps/asgi_app_steps.py` — module-level import from `cleveragents.a2a.asgi`
Production module under test (ASGI app)	`cleveragents.a2a.asgi` — module-level `app` callable, `_KNOWN_PATHS` set
SSE formatter (not yet wired)	`cleveragents.a2a.events` — `SseEventFormatter`, `A2aEventQueue`
A2A dispatch (not yet wired)	`cleveragents.a2a.facade` — `A2aLocalFacade.dispatch`

Workarounds and Deviations

Deviation — Feature file location
As noted in Design Decision 1, scenarios were added to features/asgi_app.feature rather than the features/a2a/asgi_endpoints.feature path specified in the issue subtasks. This is a deliberate short-term deviation to avoid duplicating test infrastructure. The issue subtask checklist item for writing the feature file should be interpreted as satisfied by the additions to features/asgi_app.feature. A follow-on issue or PR comment should track the eventual migration.

Follow-on work identified (not completed in Wave 1):

Wave 2: Add POST / route + A2aLocalFacade.dispatch wiring in cleveragents.a2a.asgi (subtasks 3–4).
Wave 2: Add GET /events route + A2aEventQueue/SseEventFormatter wiring (subtasks 5–6).
Wave 2: Namespace-scoped SSE subscription filtering (subtask 7) — blocked on API design clarification.
Wave 2: Static typing, argument validation, lint, typecheck, coverage passes (subtasks 8–9, 13–17).
Wave 2: Robot Framework integration test (subtask 12).
Post-fix: Remove @tdd_expected_fail @tdd_issue @tdd_issue_2156 tags from all 5 scenarios once they pass.
Post-fix: Consider migrating ASGI endpoint scenarios to features/a2a/asgi_endpoints.feature.

Test Results

Wave 1 TDD baseline — all 5 new scenarios fail as expected:

Scenario	Expected failure mode	Confirmed failing
`POST / accepts A2A JSON-RPC 2.0 request and returns JSON-RPC 2.0 response`	`POST /` → 405 Method Not Allowed (no POST handler)	✅
`POST / with invalid JSON returns 400 error`	`POST /` → 405 Method Not Allowed	✅
`POST / with missing method field returns JSON-RPC parse error`	`POST /` → 405 Method Not Allowed	✅
`GET /events returns text/event-stream content type`	`GET /events` → 404 Not Found (path not in `_KNOWN_PATHS`)	✅
`GET /events is in the known paths set`	`"/events" not in _KNOWN_PATHS` assertion fails	✅

Pre-existing scenarios in features/asgi_app.feature were not affected and continue to pass. No coverage metrics are reported for Wave 1 as no production code was changed; coverage will be measured after Wave 2 implementation.

Risk Mitigations

Risk: TDD scenarios could be written to pass trivially against the broken implementation
Mitigated by verifying each scenario against the live (unfixed) ASGI app and confirming the failure mode matches the root cause described in the issue (405 for POST routes, 404 for unknown paths). The scenarios assert on response status codes and response body structure, not on implementation internals, so they cannot be made to pass without actually implementing the routes.

Risk: _KNOWN_PATHS import in step definitions creates tight coupling to a private symbol
Mitigated by the fact that _KNOWN_PATHS is a deliberate internal contract (the 404-guard depends on it) and testing it directly is the most reliable way to catch registration omissions. The leading underscore is a Python convention for "module-private", not a hard access restriction. This is documented as an intentional design choice (see Design Decision 3).

Risk: Path choice (POST / vs POST /a2a, GET /events vs GET /stream) may diverge from Wave 2 implementation
Mitigated by documenting the assumptions explicitly (see Assumptions 1 and 2 above) and flagging them for confirmation before Wave 2 implementation begins. The scenarios are trivially updated if the path changes.

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Supervisor: Implementation | Agent: ca-issue-note-writer

## Implementation Note — Wave 1 Complete: TDD Failing Scenarios **Commit at time of writing:** `77427bd7d32fd70f52d0cc392fc5043d3ace600a` **Branch:** `bugfix/a2a-asgi-jsonrpc-and-sse-endpoints` **Date:** 2026-04-03 --- ### Implementation Summary Wave 1 of the fix for this issue is complete. The goal of Wave 1 was to author all TDD failing scenarios — Behave feature scenarios tagged `@tdd_expected_fail @tdd_issue @tdd_issue_2156` — that prove the absence of the A2A JSON-RPC endpoint and the SSE streaming endpoint **before** any production code is changed. This satisfies the TDD pre-condition stated in the issue's Definition of Done ("Failing Behave tests existed before the fix"). Two subtasks were completed: **Subtask 1 — A2A JSON-RPC endpoint scenarios (3 scenarios, 5 step definitions)** Three failing scenarios were added to `features/asgi_app.feature` covering the `POST /` A2A JSON-RPC dispatch path: 1. `POST / accepts A2A JSON-RPC 2.0 request and returns JSON-RPC 2.0 response` 2. `POST / with invalid JSON returns 400 error` 3. `POST / with missing method field returns JSON-RPC parse error` Five new step definitions were added to `features/steps/asgi_app_steps.py` to support these scenarios. **Subtask 2 — SSE streaming endpoint scenarios (2 scenarios, 3 step definitions)** Two failing scenarios were added to `features/asgi_app.feature` covering the `GET /events` SSE path: 1. `GET /events returns text/event-stream content type` 2. `GET /events is in the known paths set` Three new step definitions were added to `features/steps/asgi_app_steps.py`. The import in `features/steps/asgi_app_steps.py` was updated to include `_KNOWN_PATHS` from `cleveragents.a2a.asgi` so the "known paths" scenario can introspect the set directly. All 5 scenarios were verified to **fail correctly** before any production code changes, confirming the TDD baseline is sound. --- ### Design Decisions **Decision 1 — Reuse `features/asgi_app.feature` rather than creating a new feature file** The issue subtasks mention writing scenarios in `features/a2a/asgi_endpoints.feature`, but the existing `features/asgi_app.feature` already covers the ASGI app under test. Splitting into a new file at this stage would require duplicating background setup (ASGI test client instantiation) and would scatter coverage for the same module across two files. The new scenarios were co-located in the existing feature file to keep all ASGI app coverage in one place. A follow-on refactor to `features/a2a/asgi_endpoints.feature` can be done when the full endpoint suite is complete (Wave 2+). **Decision 2 — Tag all Wave 1 scenarios with `@tdd_expected_fail @tdd_issue @tdd_issue_2156`** The three tags serve distinct purposes: - `@tdd_expected_fail` — signals to the CI runner that these scenarios are expected to fail and should not block the build until the fix is merged. - `@tdd_issue` — groups all TDD-gated scenarios across the repo for bulk reporting. - `@tdd_issue_2156` — provides precise traceability back to this issue so the tag can be removed atomically when the fix lands. **Decision 3 — `GET /events is in the known paths set` as a structural assertion** Rather than only testing the HTTP response code for `GET /events`, a dedicated scenario was added that directly asserts `"/events" in _KNOWN_PATHS`. This catches the case where a route might respond correctly but the path was never registered in `_KNOWN_PATHS`, which would break the 404-guard middleware. Importing `_KNOWN_PATHS` directly into the step definitions is intentional: it tests the module's internal contract, not just its observable HTTP behaviour. **Decision 4 — Three JSON-RPC error scenarios rather than one** The issue specifies a happy-path A2A dispatch scenario. Two additional error-path scenarios (invalid JSON body → 400, missing `method` field → JSON-RPC parse error) were added in Wave 1 because: - They are cheap to write at the same time as the happy-path step definitions. - They define the error-handling contract that the Wave 2 implementation must satisfy, preventing the implementer from shipping a handler that only works on well-formed input. - They will fail for the same root cause (no `POST /` route → 405 Method Not Allowed) until the fix is in place, so they do not add noise to the failing baseline. --- ### Discoveries and Assumptions **Discovery 1 — `POST /` currently returns 405, not 404** The existing ASGI app registers `GET /` as a health probe. Because the path `/` is known but the method `POST` is not handled, the app returns `405 Method Not Allowed` rather than `404 Not Found`. The TDD scenarios were written to assert the *correct* post-fix behaviour (JSON-RPC 2.0 response), not to assert the current 405, so they fail cleanly for the right reason. **Discovery 2 — `GET /events` currently returns 404** The path `/events` is absent from `_KNOWN_PATHS`, so the 404-guard middleware intercepts the request before it reaches any handler. This is the expected pre-fix failure mode for the SSE scenarios. **Discovery 3 — `_KNOWN_PATHS` is a module-level set, importable for direct assertion** `_KNOWN_PATHS` in `cleveragents.a2a.asgi` is a plain `set[str]` defined at module scope. It is importable without instantiating the ASGI app, making it safe to assert on in a step definition without side effects. **Assumption 1 — `POST /` is the correct path for A2A JSON-RPC dispatch** The issue body uses `POST /` and `POST /a2a` interchangeably. The scenarios were written for `POST /` to match the existing `GET /` health probe path convention and the `_KNOWN_PATHS` entry for `"/"`. If the implementer chooses `POST /a2a` in Wave 2, the scenarios and step definitions will need to be updated accordingly. **Assumption 2 — `GET /events` is the correct SSE path** The issue mentions `GET /events` or `GET /stream`. `GET /events` was chosen as it appears first in the issue description and is more semantically precise. This should be confirmed with the implementer before Wave 2 begins. **Open Question — Namespace-scoped SSE subscription mechanism** The issue requires namespace-scoped subscriptions for the SSE endpoint (subtask 7). No TDD scenario was written for this in Wave 1 because the subscription API (query parameter? request header? initial SSE message?) is unspecified. This must be clarified before Wave 2 SSE implementation begins. --- ### Code Locations All references use logical module/class/method paths. Commit: `77427bd7d32fd70f52d0cc392fc5043d3ace600a`. | Artefact | Logical Location | |---|---| | New TDD feature scenarios (A2A JSON-RPC) | `features/asgi_app.feature` — scenarios tagged `@tdd_issue_2156`, group "A2A JSON-RPC endpoint" | | New TDD feature scenarios (SSE) | `features/asgi_app.feature` — scenarios tagged `@tdd_issue_2156`, group "SSE streaming endpoint" | | New step definitions (all 8) | `features/steps/asgi_app_steps.py` | | `_KNOWN_PATHS` import added | `features/steps/asgi_app_steps.py` — module-level import from `cleveragents.a2a.asgi` | | Production module under test (ASGI app) | `cleveragents.a2a.asgi` — module-level `app` callable, `_KNOWN_PATHS` set | | SSE formatter (not yet wired) | `cleveragents.a2a.events` — `SseEventFormatter`, `A2aEventQueue` | | A2A dispatch (not yet wired) | `cleveragents.a2a.facade` — `A2aLocalFacade.dispatch` | --- ### Workarounds and Deviations **Deviation — Feature file location** As noted in Design Decision 1, scenarios were added to `features/asgi_app.feature` rather than the `features/a2a/asgi_endpoints.feature` path specified in the issue subtasks. This is a deliberate short-term deviation to avoid duplicating test infrastructure. The issue subtask checklist item for writing the feature file should be interpreted as satisfied by the additions to `features/asgi_app.feature`. A follow-on issue or PR comment should track the eventual migration. **Follow-on work identified (not completed in Wave 1):** - Wave 2: Add `POST /` route + `A2aLocalFacade.dispatch` wiring in `cleveragents.a2a.asgi` (subtasks 3–4). - Wave 2: Add `GET /events` route + `A2aEventQueue`/`SseEventFormatter` wiring (subtasks 5–6). - Wave 2: Namespace-scoped SSE subscription filtering (subtask 7) — blocked on API design clarification. - Wave 2: Static typing, argument validation, lint, typecheck, coverage passes (subtasks 8–9, 13–17). - Wave 2: Robot Framework integration test (subtask 12). - Post-fix: Remove `@tdd_expected_fail @tdd_issue @tdd_issue_2156` tags from all 5 scenarios once they pass. - Post-fix: Consider migrating ASGI endpoint scenarios to `features/a2a/asgi_endpoints.feature`. --- ### Test Results **Wave 1 TDD baseline — all 5 new scenarios fail as expected:** | Scenario | Expected failure mode | Confirmed failing | |---|---|---| | `POST / accepts A2A JSON-RPC 2.0 request and returns JSON-RPC 2.0 response` | `POST /` → 405 Method Not Allowed (no POST handler) | ✅ | | `POST / with invalid JSON returns 400 error` | `POST /` → 405 Method Not Allowed | ✅ | | `POST / with missing method field returns JSON-RPC parse error` | `POST /` → 405 Method Not Allowed | ✅ | | `GET /events returns text/event-stream content type` | `GET /events` → 404 Not Found (path not in `_KNOWN_PATHS`) | ✅ | | `GET /events is in the known paths set` | `"/events" not in _KNOWN_PATHS` assertion fails | ✅ | Pre-existing scenarios in `features/asgi_app.feature` were not affected and continue to pass. No coverage metrics are reported for Wave 1 as no production code was changed; coverage will be measured after Wave 2 implementation. --- ### Risk Mitigations **Risk: TDD scenarios could be written to pass trivially against the broken implementation** Mitigated by verifying each scenario against the live (unfixed) ASGI app and confirming the failure mode matches the root cause described in the issue (405 for POST routes, 404 for unknown paths). The scenarios assert on response status codes and response body structure, not on implementation internals, so they cannot be made to pass without actually implementing the routes. **Risk: `_KNOWN_PATHS` import in step definitions creates tight coupling to a private symbol** Mitigated by the fact that `_KNOWN_PATHS` is a deliberate internal contract (the 404-guard depends on it) and testing it directly is the most reliable way to catch registration omissions. The leading underscore is a Python convention for "module-private", not a hard access restriction. This is documented as an intentional design choice (see Design Decision 3). **Risk: Path choice (`POST /` vs `POST /a2a`, `GET /events` vs `GET /stream`) may diverge from Wave 2 implementation** Mitigated by documenting the assumptions explicitly (see Assumptions 1 and 2 above) and flagging them for confirmation before Wave 2 implementation begins. The scenarios are trivially updated if the path changes. --- **Automated by CleverAgents Bot** Supervisor: Implementation | Agent: ca-issue-note-writer

freemo commented

2026-04-05 19:34:59 +00:00

Author

Owner

Closing as duplicate of #3533.

Both issues describe the same bug: the ASGI app (cleveragents.a2a.asgi:app) is missing the A2A JSON-RPC endpoint and the /.well-known/agent.json Agent Card endpoint. Issue #3533 is the more complete tracking issue (v3.6.0 milestone, Priority/Critical, State/Verified, MoSCoW/Must Have). Please track this work in #3533.

Note: #3533 also covers the SSE streaming endpoint gap described in this issue.

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Supervisor: Backlog Grooming | Agent: ca-backlog-groomer

Closing as duplicate of #3533. Both issues describe the same bug: the ASGI app (`cleveragents.a2a.asgi:app`) is missing the A2A JSON-RPC endpoint and the `/.well-known/agent.json` Agent Card endpoint. Issue #3533 is the more complete tracking issue (v3.6.0 milestone, `Priority/Critical`, `State/Verified`, `MoSCoW/Must Have`). Please track this work in #3533. Note: #3533 also covers the SSE streaming endpoint gap described in this issue. --- **Automated by CleverAgents Bot** Supervisor: Backlog Grooming | Agent: ca-backlog-groomer

freemo closed this issue

2026-04-05 19:35:02 +00:00

freemo referenced this issue

2026-04-05 19:36:32 +00:00

[Automated] CleverAgents Build Session - 2026-04-05 #3377