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Stop compat from stripping sampling params on datasheet rows without model_parameters - #8782
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…meters Rows like apac.anthropic.claude-sonnet-4-6 carry capability flags but no model_parameters list, so the allowlist shrank to flags alone and compat's should_drop_params stripped max_tokens/temperature/top_p. Bedrock then substituted the model default maxTokens — a request for 7 tokens got billed up to the model default. An undisclosed list means the surface is unknown, not empty: seed the baseline sampling and token-limit params instead.
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| Check name | Status | Explanation | Resolution |
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| Description check |  |
The description explains the problem, implementation, affected behavior, related issue, and test command. However, it omits most required template sections, including Type of change, Affected areas, B… | Update the description to include all required template headings and information. Mark the applicable Type of change, Affected areas, and Breaking changes options; document security considerations, screenshots status if applicable, checklis… |
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Check name Status Explanation Title check The title clearly identifies the main change: preserving sampling parameters when datasheet rows omit model_parameters. Linked Issues check Issue #8765requires that rows withoutmodel_parameterskeepmaxTokens,temperature, andtopPinstead of having compat drop them. The reviewed head adds a guard inextractSupportedParams(fr…Out of Scope Changes check The changes since the whole-PR base touch only framework/modelcatalog/datasheet/types.go (the extractSupportedParamsguard) and framework/modelcatalog/datasheet/capabilities_test.go (the new test an…Docstring Coverage Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 2 files. Full details: Linked Issues check
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Explanation
Issue
#8765requires that rows withoutmodel_parameterskeepmaxTokens,temperature, andtopPinstead of having compat drop them. The reviewed head adds a guard inextractSupportedParams(framework/modelcatalog/datasheet/types.go). Whenparsed.ModelParameters == nil, it addstemperature,top_p,stop,max_tokens,max_completion_tokens, andmax_output_tokensto the allowlist. This keeps those params from being dropped by compat'sshould_drop_paramspath. Rows that declare a list keep the existing loop unchanged, so their declared surface is preserved. The head also changes the guard from an empty-length check to a nil check. An explicit[]therefore declares an empty surface and receives no defaults. This matches the current PR description and the issue scope.TestExtractSupportedParams_NoModelParametersin capabilities_test.go covers flag-only rows, a declared list (wheretop_pstays absent), and JSON absent,null, and[]cases. The test relies on JSON unmarshalling producing nil for absent ornulllists. I did not inspect the datasheet loader for any step that converts nil to an empty slice, so that path is assumed rather than confirmed. The Bedrock-side behavior was not re-run in this review. The allowlist fix addresses the root cause the issue identifies.
Full details: Out of Scope Changes check
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Explanation
The changes since the whole-PR base touch only framework/modelcatalog/datasheet/types.go (the
extractSupportedParamsguard) and framework/modelcatalog/datasheet/capabilities_test.go (the new test and theencoding/jsonimport used by that test). Both directly implement the#8765requirement, and the test guards it. No unrelated implementation, provider, or compat-plugin changes appear in the reviewed diff.
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Full details: Description check
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Explanation
The description explains the problem, implementation, affected behavior, related issue, and test command. However, it omits most required template sections, including Type of change, Affected areas, Breaking changes, Security considerations, Screenshots/Recordings, and Checklist.
Resolution
Update the description to include all required template headings and information. Mark the applicable Type of change, Affected areas, and Breaking changes options; document security considerations, screenshots status if applicable, checklist status, and related issues under the required headings.
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Actionable comments posted: 1
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Inline comments:
Review comments at @framework/modelcatalog/datasheet/types.go:
- Line 616: Update the ModelParameters fallback condition to check whether
parsed.ModelParameters is nil rather than whether its length is zero, so
defaults apply only when metadata is absent; preserve explicit empty slices and
add coverage for that case to ensure unsupported request parameters are dropped.
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framework/modelcatalog/datasheet/capabilities_test.goframework/modelcatalog/datasheet/types.go
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Hi @ege-arhan ,
There is a small nitpick from coderabbit; the rest looks fine.
…ot an explicit empty list
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Fixes #8765
Rows such as
apac.anthropic.claude-sonnet-4-6have capability flags but nomodel_parameterslist, soextractSupportedParamsended up with only flag-derived entries (tools, tool_choice, …) and no sampling or token-limit params at all. Withshould_drop_paramson by default, the compat plugin then removedmax_tokens,temperatureandtop_pbefore the request reached Bedrock, andGetMaxOutputTokensOrDefaultquietly filled in the model default. The caller gets a 200 and is billed for up to 64k tokens after asking for 7.A missing list describes a gap in the datasheet, not a model that rejects temperature. When a row declares no
model_parameters, I now seed the allowlist with the baseline sampling and token-limit spellings (temperature,top_p,stop,max_tokens,max_completion_tokens,max_output_tokens). Rows that do carry amodel_parameterslist keep exactly the surface they declare, so genuinely unsupported params are still dropped there.Added
TestExtractSupportedParams_NoModelParameterscovering both cases;go test ./modelcatalog/datasheet/...passes.