release: 3.18.0

[stainless-app]

Automated Release PR

3.18.0 (2026-03-25)

Full Changelog: v3.7.0...v3.18.0

Features

• Add explicit SSE event names for local v3 streaming (493abf4)
• Include LLM headers in ModelConfig (b0df6bc)

Chores

• ci: skip lint on metadata-only changes (4049e44)
• internal: update gitignore (5acaa6f)

---

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

[stainless-app]

🧪 Testing

To try out this version of the SDK:

pip install 'https://pkg.stainless.com/s/stagehand-python/4049e44cb7855c62d2231c34c6211532860dfdbf/stagehand-3.7.0-py3-none-any.whl'

Expires at: Fri, 24 Apr 2026 12:42:16 GMT
Updated at: Wed, 25 Mar 2026 12:42:16 GMT

[cubic-dev-ai]

No issues found across 5 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 Client Application
    participant SDK as Stagehand SDK
    participant API as Stagehand API

    App->>SDK: Initialize Client
    SDK->>SDK: CHANGED: Load version 3.7.1 from _version.py
    
    App->>SDK: Call API method (e.g. act/observe)
    SDK->>API: Request with Identification Headers
    Note over SDK,API: CHANGED: User-Agent header reports version 3.7.1
    API-->>SDK: Response
    SDK-->>App: Result

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[stainless-app]

Release version edited manually

The Pull Request version has been manually set to 3.18.0 and will be used for the release.

If you instead want to use the version number 3.8.0 generated from conventional commits, just remove the label autorelease: custom version from this Pull Request.

[stainless-app]

🤖 Release is at https://github.com/browserbase/stagehand-python/releases/tag/v3.18.0 🌻