Add Stagehand extension

[shrey150]

Summary

Adds a Stagehand extension template with run, snapshot, and screenshot tools. Model code is compiled in the Node.js host to work within Chrome's extension CSP, while a serialized session and explicit close() provide recovery and bounded cleanup.

The template uses keepAlive: false, shares one browser per process, and treats snapshot IDs as informational.

Validation

The focused suite passed 20/20 tests. The packed extension built successfully in a fresh Eve app with Stagehand's browser assets intact, and a real Browserbase eval passed all 9 gates across navigation, state reuse, snapshot, screenshot, and close; the remote session reached COMPLETED.

Checklist

• This change was requested or approved by a maintainer
• I ran the relevant checks from CONTRIBUTING.md
• I added tests and documentation where relevant
• I added a changeset if this touches the published eve package
• DCO sign-off passes for every commit (git commit --signoff)

No changeset is needed because this adds a private template.

Diff size

Docs — 2 files · +123 / -0

Documents setup and the model-facing browser contract.

Implementation — 12 files · +635 / -2

Adds the Eve tools, session lifecycle, package configuration, and lockfile entries.

Tests — 3 files · +483 / -0

Covers execution, recovery, and cleanup behavior.

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2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
eve-docs-4759	Skipped		Aug 21, 2026 3:57pm
eve-pkg	Skipped		Aug 21, 2026 3:57pm

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​@​browserbasehq/​stagehand@​4.0.1

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