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Author SHA1 Message Date
Hongming Wang
63ac99788b fix(runtime): isolate card-skill enrichment + transcript handler from adapter shape mismatch
PR #2756 added a try/except around adapter.setup() so a missing LLM key
doesn't crash the workspace boot. Two paths that now run AFTER setup
succeeds were not similarly isolated, leaving small but real coupling
risks for future adapter authors.

1. **Skill metadata enrichment swap (main.py:248-259).** When
   adapter.setup() returns, main.py reads adapter.loaded_skills and
   replaces the static stubs in agent_card.skills with rich metadata
   (description, tags, examples). The list comprehension assumes each
   element exposes .metadata.{id,name,description,tags,examples}. A
   future adapter that returns a non-canonical shape would raise
   AttributeError, propagate to the outer except, capture as
   adapter_error, and silently degrade an OK boot to the
   not-configured state — even though setup() actually succeeded.

   Extract to card_helpers.enrich_card_skills(card, loaded_skills) →
   bool. Helper swallows enrichment failures, logs the cause, returns
   False, leaves the static stubs in place. setup() success path
   continues unchanged. 6 unit tests cover: None input, empty list,
   canonical happy path, missing .metadata attr, partial .metadata
   (missing one canonical field), atomic-failure-no-partial-swap.

2. **/transcript handler (main.py:513).** Calls await
   adapter.transcript_lines(...) without try/except. BaseAdapter's
   default returns {"supported": false} so today's 4 adapters never
   trigger this — but a future adapter override that assumes setup()
   ran would surface as a 500 from Starlette's default error handler
   instead of a useful 503 with the exception class + message.
   Inline try/except returns 503 with the reason, matching the
   not-configured JSON-RPC handler's pattern.

Both changes match the architectural principle the PR #2756 chain
established: availability (workspace reachable) is decoupled from
configuration / adapter behavior. Operators see useful errors instead
of silent degradation; future adapter authors can't accidentally
break tenant readiness with a shape mismatch.

Adds:
- workspace/card_helpers.py (~50 lines, 100% covered)
- workspace/tests/test_card_helpers.py (6 tests)
- AgentCard/AgentSkill/AgentCapabilities/AgentInterface stubs to
  workspace/tests/conftest.py so future card-related tests work
  under the existing a2a-mock infrastructure
- card_helpers in TOP_LEVEL_MODULES (drift gate would have caught it)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-04 14:15:27 -07:00