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fix(claude): drop prefill and forced tool_choice where Anthropic rejects them - #5555
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…cts them Same rule #5524 applied to providers/anthropic, extended to every other provider serving these models.
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SDK live feature checksResult: failed (85/85 scenarios) Informational — does not block merge.
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Summary
#5524 removed
assistant_prefill(Claude 4.6+) and forcedtool_choice(Opus/Sonnet 5.5) fromproviders/anthropic. The same models on every other provider still declare them, so the gateway offers features that return 400.flowchart TD F[Claude file on a non-Anthropic provider] --> V{model >= 4.6?} V -->|yes| AP[drop assistant_prefill<br/>Anthropic returns 400] V -->|no| K1[keep] F --> O{Opus or Sonnet 5.5?} O -->|yes| TC["drop tool_choice<br/>(forced tool / any rejected;<br/>auto stays via function_calling)"] O -->|no| K2[keep] AP --> S{"file in an open PR?<br/>5505, 5542, 5514, trueforge 5544"} TC --> S S -->|yes| L[left to that PR] S -->|no| E[edited here]85 files, deletions only: aws-bedrock 36 | microsoft-foundry 13 | google-vertex 11 | azure-ai-foundry 8 | databricks 7 | aws-bedrock-mantle 5 | openrouter 5.
Not here: files already fixed in open PRs (#5505, #5542, #5514).
eu.anthropic.claude-sonnet-5-5is also in trueforge's #5544, which is left alone.Evidence
tool_choicetypetool/anynot supported.autostill works throughfunction_calling.Merge Danger
Door: two-way
Blast Radius: features
Clients asking the gateway for prefill or forced tool choice on these models get the feature reported as unsupported instead of a provider 400.