x-sent-at removal, x-stainless-any fix, optional frame id, ModelConfigString fix

[monadoid]

why

Fixes for having openapi spec pass stainless checks.

what changed

test plan

[changeset-bot]

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[github-actions]

✱ Stainless preview builds

This PR will update the stagehand SDKs with the following commit message.

feat: x-stainless-any fix, optional frame id, ModelConfigString fix

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Last updated: 2026-01-16 00:04:48 UTC

[cubic-dev-ai]

No issues found across 3 files

[greptile-apps]

Greptile Summary

This PR makes targeted fixes to the OpenAPI specification and Zod schemas to improve compatibility with the Stainless code generation tool. The changes include: renaming ModelName to ModelConfigString for clarity, changing 5 frameId fields from optional to nullish (allowing explicit null values), updating model name examples to reflect unprefixed format, adding x-stainless-any: true annotations to 3 unknown-type fields, removing the unused x-sent-at header definition, and updating the OpenAPI generation script to use x-stainless-any instead of type: unknown.

Confidence Score: 5/5

• This PR is safe to merge with no identified issues
• All changes are straightforward, well-targeted fixes for OpenAPI spec validation. The schema renames are consistent across files, the frameId changes from optional() to nullish() are semantically correct (explicitly allowing null vs undefined), the x-stainless-any annotations are appropriately applied to unknown-type fields, and the removal of the unused x-sent-at header is safe. Generated YAML matches expected transformations. No breaking changes or runtime impact.
• No files require special attention

Important Files Changed

Filename	Overview
packages/core/lib/v3/types/public/api.ts	Zod schema updates for OpenAPI spec compatibility: (1) Renamed ModelNameSchema to ModelConfigStringSchema with updated description for clarity, (2) Updated ModelConfigObjectSchema.modelName description and example to reflect unprefixed model names, (3) Changed 4 frameId fields from optional() to nullish() to allow null values explicitly in OpenAPI specs, (4) Added override metadata to 3 z.unknown() fields to inject x-stainless-any: true into generated JSON schemas.
packages/server/openapi.v3.yaml	Generated OpenAPI spec reflecting Zod schema changes: (1) Renamed ModelName to ModelConfigString schema component, (2) Updated modelName examples from prefixed to unprefixed format, (3) Converted 5 frameId fields from type: string to anyOf: [string, null] to explicitly allow null values, (4) Added x-stainless-any: true to ExtractResult.result, NavigateResult.result, and StreamEventSystemData.result fields, (5) Removed x-sent-at header definition from SessionHeaders and all endpoint parameters.
packages/server/scripts/gen-openapi.ts	Updated post-processing logic to replace type: unknown with x-stainless-any: true in 3 regex patterns and added a new pattern (comment #4) for StreamEventSystemData*.result. Updated schema registration to use ModelConfigStringSchema instead of ModelNameSchema. Comment numbering adjusted from 4-5 to 5-6 due to new regex pattern.

[pirate]

Nah keep prefix recommended in all possible shapes, API can handle it.