fix(provider): keep compacted Anthropic tool histories user-led#31052
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fix(provider): keep compacted Anthropic tool histories user-led#31052codeg-dev wants to merge 1 commit into
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This was referenced Jun 6, 2026
Strip unsupported Claude assistant prefill and prepend a synthetic user boundary when a compacted Anthropic history starts with a fully matched assistant tool-call exchange. Constraint: Anthropic rejects assistant-prefill and assistant-led tool histories for affected Claude 4.6-4.8 paths. Rejected: Rewrite session compaction | provider-bound normalization is narrower and leaves non-Anthropic histories unchanged. Confidence: medium Scope-risk: moderate Directive: Keep this provider-specific; do not apply synthetic boundaries to providers that support assistant-led histories. Tested: v1.16.2-codeg.20260606 custom artifact built and deployed; GPT-5.5 and tool-failure smoke passed on mtb/fob/ops/hq. Not-tested: Full upstream dev test suite for this focused branch.
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This was referenced Jun 7, 2026
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Issue for this PR
Closes #31048
Type of change
What does this PR do?
Normalizes Anthropic-bound message histories in two narrowly scoped cases:
This keeps Anthropic request histories user-led where required while leaving non-Anthropic providers unchanged. Assistant tool-call prefill is preserved when thinking mode still needs it.
Prepared with AI assistance.
How did you verify your code works?
git diff --check -- packages/opencode/src/provider/transform.tsopenai/gpt-5.5normal smoke and tool-failure recovery on all custom hosts; hq also verified the Windows desktop backend/,/agent, and/configreturned 200.Screenshots / recordings
Not a UI change.
Checklist