release: 3.19.1

[stainless-app]

Automated Release PR

3.19.1 (2026-03-31)

Full Changelog: v3.19.0...v3.19.1

---

This pull request is managed by Stainless's GitHub App.

The semver version number is based on included commit messages. Alternatively, you can manually set the version number in the title of this pull request.

For a better experience, it is recommended to use either rebase-merge or squash-merge when merging this pull request.

🔗 Stainless website
📚 Read the docs
🙋 Reach out for help or questions

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Summary by cubic

Prepare stagehand v3.19.1 release by bumping the version in pyproject.toml, src/stagehand/_version.py, .release-please-manifest.json, and updating CHANGELOG.md. No functional or API changes.

^{Written for commit 9cbcfe4. Summary will update on new commits. Review in cubic}

[stainless-app]

🧪 Testing

To try out this version of the SDK:

pip install 'https://pkg.stainless.com/s/stagehand-python/e22ed1b1888511c0cd465002ae1818df8d6032c9/stagehand-3.19.0-py3-none-any.whl'

Expires at: Thu, 30 Apr 2026 20:50:07 GMT
Updated at: Tue, 31 Mar 2026 20:50:07 GMT

[cubic-dev-ai]

No issues found across 4 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

Architecture diagram

sequenceDiagram
    participant App as User Application
    participant SDK as Stagehand SDK
    participant Meta as Metadata (_version.py)
    participant API as Stagehand API

    Note over App, API: Runtime SDK Request Flow

    App->>SDK: Initialize Client()
    SDK->>Meta: CHANGED: Load __version__ (3.19.1)
    Meta-->>SDK: "3.19.1"

    App->>SDK: perform_action()
    
    SDK->>SDK: Build Request Headers
    Note right of SDK: Sets User-Agent: stagehand-python/3.19.1<br/>Sets X-Stainless-Package-Version: 3.19.1

    SDK->>API: HTTP Request (with version headers)
    
    alt Successful Request
        API-->>SDK: 200 OK
        SDK-->>App: Action Result
    else Version Deprecated/Error
        API-->>SDK: 4xx/5xx Error
        SDK-->>App: Exception
    end

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[stainless-app]

🤖 Release is at https://github.com/browserbase/stagehand-python/releases/tag/v3.19.1 🌻