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afc01d6995
molecule-core/workspace
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Hongming Wang afc01d6995 fix(mcp): friendly fail-fast when stdio isn't pipe-compatible 
When molecule-mcp is launched with stdin or stdout redirected to a
regular file (molecule-mcp > out.txt, ad-hoc CI smoke-tests, local
debugging), asyncio.connect_read_pipe / connect_write_pipe later raise
ValueError: Pipe transport is only for pipes, sockets and character
devices — surfaced to the operator as a confusing traceback with no
hint about what to do.

Add _assert_stdio_is_pipe_compatible() to detect the same constraint
synchronously before the event loop starts, exit cleanly with code 2,
and print a stderr message that names:
  - which stream failed (stdin vs stdout)
  - the asyncio transport requirement
  - the two common causes (>file, <file) and a working alternative
    (molecule-mcp 2>&1 | tee out.txt)

Wired into cli_main() (the synchronous wrapper around asyncio.run(main()))
so wheel-smoke + the production launch path both go through the guard
without changing the async stdio loop body. Closed/stale-fd case also
handled — os.fstat OSError exits 2 with the same guidance instead of
escaping.

Tests: 4 new in TestStdioPipeAssertion — pipe-pair happy path,
regular-file stdout (the bug condition), regular-file stdin (symmetric
case), and closed-fd. Mutation-verified — all 4 fail without the prod
helper. 37/37 in test_a2a_mcp_server.py.

Closes Molecule-AI/molecule-ai-workspace-runtime#61.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-01 18:26:24 -07:00
..
adapters fix: comprehensive a2a-sdk 1.x migration sweep across workspace/ 2026-04-27 09:42:57 -07:00
builtin_tools feat(harness): coordinator phase-boundary instrumentation for RFC #2251 2026-04-28 20:11:46 -07:00
lib feat(workspace): pre-stop serialization for pause/resume (closes #1386) 2026-04-21 12:40:44 +00:00
molecule_audit chore: open-source restructure — rename dirs, remove internal files, scrub secrets 2026-04-18 00:24:44 -07:00
platform_tools feat(workspace-runtime): add inbox polling for standalone molecule-mcp path 2026-04-30 16:32:48 -07:00
plugins_registry feat(plugin): implement MCPServerAdaptor (issue #847) 2026-04-24 01:42:13 +00:00
policies feat(platform): single-source-of-truth tool registry — adapters consume, no drift 2026-04-28 17:11:36 -07:00
scripts fix(git-token-helper): close TOCTOU window + stop swallowing chmod errors (closes #1552) 2026-04-26 08:22:29 -07:00
skill_loader feat(skills): per-skill runtime compatibility (#119, hermes pattern) 2026-04-27 01:57:43 -07:00
tests fix(mcp): friendly fail-fast when stdio isn't pipe-compatible 2026-05-01 18:26:24 -07:00
.coveragerc test(workspace): centralize pytest-cov config + 92% floor (closes #1817) 2026-04-26 06:21:22 -07:00
a2a_cli.py fix(runtime): use lowercase wire role for v0.3 JSON-RPC compat layer 2026-04-27 12:40:11 -07:00
a2a_client.py feat(a2a-client): surface 410 Gone as 'removed' error so callers can re-onboard (#2429) 2026-04-30 22:08:08 -07:00
a2a_executor.py fix: comprehensive a2a-sdk 1.x migration sweep across workspace/ 2026-04-27 09:42:57 -07:00
a2a_mcp_server.py fix(mcp): friendly fail-fast when stdio isn't pipe-compatible 2026-05-01 18:26:24 -07:00
a2a_tools.py refactor(workspace-runtime): send_a2a_message takes peer_id, validates UUID 2026-04-30 17:43:01 -07:00
adapter_base.py feat(platform): single-source-of-truth tool registry — adapters consume, no drift 2026-04-28 17:11:36 -07:00
agent.py chore: open-source restructure — rename dirs, remove internal files, scrub secrets 2026-04-18 00:24:44 -07:00
agents_md.py chore: open-source restructure — rename dirs, remove internal files, scrub secrets 2026-04-18 00:24:44 -07:00
build-all.sh fix: update workspace script comments for workspace-template → workspace rename 2026-04-18 01:48:05 -07:00
config.py feat(config): add observability block schema (#119 PR-1 of 4) 2026-04-30 21:58:45 -07:00
configs_dir.py fix(runtime): auto-fallback CONFIGS_DIR for non-container hosts (closes #2458) 2026-05-01 13:07:55 -07:00
consolidation.py fix: apply #1124 env-var defaults + scrub F1088 credentials from INCIDENT_LOG.md (#1347) 2026-04-21 08:11:44 +00:00
coordinator.py feat(harness): coordinator phase-boundary instrumentation for RFC #2251 2026-04-28 20:11:46 -07:00
Dockerfile feat(workspace): 45-min gh-token refresh daemon + credential helper cache 2026-04-22 19:52:46 -07:00
entrypoint.sh fix(workspace): credential helper security hardening (#1797) 2026-04-23 18:14:55 +00:00
events.py chore: open-source restructure — rename dirs, remove internal files, scrub secrets 2026-04-18 00:24:44 -07:00
executor_helpers.py feat(workspace-runtime): add inbox polling for standalone molecule-mcp path 2026-04-30 16:32:48 -07:00
heartbeat.py fix(workspace): in-container heartbeat persists platform_inbound_secret 2026-04-30 18:18:10 -07:00
inbox.py fix(inbox): skip self-notify rows in poller to break echo loop 2026-05-01 17:35:49 -07:00
initial_prompt.py chore: open-source restructure — rename dirs, remove internal files, scrub secrets 2026-04-18 00:24:44 -07:00
internal_chat_uploads.py fix(workspace): surface errno + path on chat-upload mkdir failure 2026-05-01 11:47:53 -07:00
internal_file_read.py feat(chat_files): rewrite Download as HTTP-forward (RFC #2312, PR-D) 2026-04-29 15:19:02 -07:00
main.py feat(wheel-smoke): exercise executor.execute() to catch lazy imports (#2275) 2026-04-30 21:21:18 -07:00
mcp_cli.py fix(runtime): register configs_dir in TOP_LEVEL_MODULES + drop alias 2026-05-01 13:13:57 -07:00
molecule_ai_status.py fix(runtime): replace remaining /app/ legacy paths in agent prompts + docstrings 2026-04-27 11:22:00 -07:00
platform_auth.py fix(runtime): auto-fallback CONFIGS_DIR for non-container hosts (closes #2458) 2026-05-01 13:07:55 -07:00
platform_inbound_auth.py fix(runtime): auto-fallback CONFIGS_DIR for non-container hosts (closes #2458) 2026-05-01 13:07:55 -07:00
plugins.py chore: open-source restructure — rename dirs, remove internal files, scrub secrets 2026-04-18 00:24:44 -07:00
preflight.py feat(preflight): replace SUPPORTED_RUNTIMES static list with adapter discovery 2026-04-27 00:44:51 -07:00
prompt.py feat(prompt): Platform Capabilities preamble at top of system prompt 2026-04-29 21:31:13 -07:00
pytest.ini feat(preflight): replace SUPPORTED_RUNTIMES static list with adapter discovery 2026-04-27 00:44:51 -07:00
rebuild-runtime-images.sh fix: update workspace script comments for workspace-template → workspace rename 2026-04-18 01:48:05 -07:00
requirements.txt feat(workspace): /internal/chat/uploads/ingest endpoint (RFC #2312, PR-B) 2026-04-29 14:16:32 -07:00
runtime_wedge.py chore(workspace): drop claude_sdk_executor — Phase 2 of #87 2026-04-27 00:52:55 -07:00
shared_runtime.py feat(platform): single-source-of-truth tool registry — adapters consume, no drift 2026-04-28 17:11:36 -07:00
smoke_mode.py chore(smoke): runtime_wedge follow-ups from PR #2473 review 2026-05-01 18:01:51 -07:00
transcript_auth.py chore: open-source restructure — rename dirs, remove internal files, scrub secrets 2026-04-18 00:24:44 -07:00
watcher.py chore: open-source restructure — rename dirs, remove internal files, scrub secrets 2026-04-18 00:24:44 -07:00