Chromie/fix can you export the aisdk tool

[chromiebot]

why

what changed

test plan

---

Summary by cubic

Exported the Tool type and tool function in the public API so users can import them from @browserbasehq/stagehand and define custom tools. Added tests to verify both exports match the upstream package.

• New Features
  • Re-exported Tool type in packages/core/lib/v3/types/public/agent.ts.
  • Exported tool function in packages/core/lib/v3/index.ts.

^{Written for commit 181bc31. Summary will update on new commits.}

[changeset-bot]

🦋 Changeset detected

Latest commit: 181bc31

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@browserbasehq/stagehand	Patch
@browserbasehq/stagehand-evals	Patch
@browserbasehq/stagehand-server	Patch

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[cubic-dev-ai]

No issues found across 3 files

[greptile-apps]

Greptile Summary

Re-exports the Tool type from the AI SDK (ai package) to allow Stagehand consumers to define custom tools without requiring a direct dependency on the AI SDK. This follows the existing pattern of re-exporting ModelMessage from the same package (line 19 in agent.ts).

• Added Tool type re-export in packages/core/lib/v3/types/public/agent.ts
• Updated type manifest in public-types.test.ts to include the new export
• Created dedicated test file tool-type-export.test.ts with type compatibility checks

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The changes are minimal, well-tested, and follow existing patterns in the codebase. The PR only adds a type re-export without modifying any runtime behavior, and includes comprehensive tests to verify type compatibility.
• No files require special attention

Important Files Changed

Filename	Overview
packages/core/lib/v3/types/public/agent.ts	Added Tool type re-export from AI SDK to allow consumers to define custom tools without direct dependency
packages/core/tests/public-api/public-types.test.ts	Updated type manifest to include Tool type in expected exports list
packages/core/tests/public-api/tool-type-export.test.ts	Added comprehensive tests verifying Tool type is correctly re-exported and matches AI SDK type

Sequence Diagram

sequenceDiagram
    participant Consumer as Stagehand Consumer
    participant Stagehand as @browserbasehq/stagehand
    participant AISDK as ai (AI SDK)

    Note over Consumer,AISDK: Before this PR
    Consumer->>AISDK: import { Tool } from "ai"
    Consumer->>Stagehand: import { AgentConfig } from "@browserbasehq/stagehand"
    Consumer->>Consumer: Define custom tools using Tool type
    Note over Consumer: Required direct dependency on "ai" package

    Note over Consumer,AISDK: After this PR
    Consumer->>Stagehand: import { Tool, AgentConfig } from "@browserbasehq/stagehand"
    Stagehand->>AISDK: Re-exports Tool type
    Consumer->>Consumer: Define custom tools using Tool type
    Note over Consumer: No direct dependency on "ai" package needed

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