The molecule-runtime wheel's config.py defaults model to
`anthropic:claude-opus-4-7` so langchain/crewai consumers get a uniform
provider:model string out of the box. The claude CLI's --model arg
expects the bare model id and silently exits 1 (no stderr) on prefixed
strings — root cause of the 2026-05-01 "Agent error (Exception)" mid-A2A
bug. Diagnosed via strace on a live workspace: the CLI received
`--model anthropic:claude-opus-4-7` and exit_group(1)'d before any
non-fatal output.
Add `_strip_provider_prefix` and call it in both setup() (so
_resolve_provider routes anthropic:claude-X correctly to anthropic-api
instead of falling back to oauth) and create_executor() (so the bare
id reaches the CLI). Only known-Claude prefixes are stripped; unknown
ones (openai:, bedrock:) pass through so the CLI fails loudly instead
of being silently mangled.
Coverage: 8 new tests — unit tests for the helper across all branches,
end-to-end `create_executor` strip on dict + dataclass shapes, and a
caplog-based setup() test that pins provider=anthropic-api routing
after the strip (the silent-fallback failure mode this fix eliminates).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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