release: 3.18.0

[stainless-app]

Automated Release PR

3.18.0 (2026-03-24)

Full Changelog: v3.16.0...v3.18.0

Features

• [fix]: add useSearch & toolTimeout to stainless types (b192d02)
• [STG-1607] Yield finished SSE event instead of silently dropping it (bcbd0d1)
• Add explicit SSE event names for local v3 streaming (a9777b9)
• Add missing cdpHeaders field to v3 server openapi spec (07f2358)
• Include LLM headers in ModelConfig (879642a)
• Revert broken finished SSE yield config (7910a59)
• variables for observe (9187d2e)

Chores

• internal: codegen related update (20b3106)
• internal: tweak CI branches (5c0e28e)
• internal: upgrade phpunit (b09b7ff)

---

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.

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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 3.17.0 generated from conventional commits, just remove the label autorelease: custom version from this Pull Request.

[monadoid]

LGTM

[stainless-app]

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