The cherry-picked #114482 never resolved a profile in production: the only
caller, agent/model_metadata.py::_resolve_bedrock_context_length, invokes
get_bedrock_context_length(model, probe=False) with no region, and the
resolver was gated on `region`; and it called
get_inference_profile(inferenceProfileId=...) where botocore requires
`inferenceProfileIdentifier`, so even with a region the call raised
ParamValidationError, was swallowed, and the 128k default applied with only
the new warning. Live against a botocore Stubber: 128000 before, 1000000 after.
- resolve in the ARN's own region (field 4), then the passed region, then
the standard AWS chain; the runtime region / base_url may differ
- inferenceProfileIdentifier is the only request parameter GetInferenceProfile has
- match only `application-inference-profile/`: system-defined
`inference-profile/us.anthropic...` ARNs embed the model id and need no call
- no nested-profile recursion: GetInferenceProfile lists foundation-model ARNs
and the wrapped ARN itself satisfies the static-table substring match
- cache both outcomes per process (runs on every context-length resolution),
cleared by reset_client_cache()
- tests trimmed to two invariants on the production call shape; restore the
TestBedrockContextProbe class header the cherry-pick clobbered
- docs: bedrock:GetInferenceProfile IAM permission and the fallback WARNING
Co-authored-by: Yagna Vudathu <yagnavudathu@gmail.com>
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