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docs: add docs for providerToolSearchMiddleware#4355

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Mason Daugherty (mdrxy) merged 8 commits into
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alex/provider-tool-search-middleware
Jun 10, 2026
Merged

docs: add docs for providerToolSearchMiddleware#4355
Mason Daugherty (mdrxy) merged 8 commits into
mainfrom
alex/provider-tool-search-middleware

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@aolsenjazz

@aolsenjazz Alexander Olsen (aolsenjazz) commented Jun 8, 2026 •
edited by mdrxy
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Overview

Documents the new providerToolSearchMiddleware on the prebuilt middleware page. Adds a JS-only "Provider tool search" section plus a JS middleware-table entry, and registers the providerToolSearchMiddleware symbol in link_map.py.

Type of change

Type: Update existing documentation

Related issues/PRs

  • Linear issue: LC-544

Checklist

  • I have read the contributing guidelines, including the language policy
  • I have tested my changes locally using docs dev
  • All code examples have been tested and work correctly
  • I have used root relative paths for internal links
  • I have updated navigation in src/docs.json if needed

Additional notes

@github-actions github-actions Bot added docs-infra langchain For docs changes to LangChain oss python For content related to the Python version of LangChain projects internal labels Jun 8, 2026
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github-actions Bot commented Jun 8, 2026

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Thanks for opening a docs PR, Alexander Olsen (@aolsenjazz)! When it's ready for review, please add the relevant reviewers:

  • @npentrel or @lnhsingh (LangChain)

@aolsenjazz Alexander Olsen (aolsenjazz) mentioned this pull request Jun 10, 2026
Merged
@aolsenjazz @open-swe
docs: add Python docs for ProviderToolSearchMiddleware
0a9dd37 
Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>
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github-actions Bot commented Jun 10, 2026

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❌ Import check failed

This PR contains imports from langchain_core that should be imported from langchain instead.

Detailed issues 
Analyzing diff for import issues...
 Found 1 import issues:

File: src/oss/langchain/middleware/built-in.mdx
Line: 2319
Issue: Import from langchain.tools instead of langchain_core.tools
Current:   from langchain_core.tools import tool
Suggested: from langchain.tools import tool
--------------------------------------------------------------------------------

 Found 1 import issues that need to be fixed.

Why this is a problem

The langchain package re-exports many modules and classes from langchain_core. When possible, imports should use langchain instead of langchain_core for:

  • Better user experience (single import source)
  • Consistency across documentation
  • Reduced cognitive load for users

How to fix

Replace the imports as suggested above. For example:

  • ❌ from langchain_core.messages import HumanMessage
  • ✅ from langchain.messages import HumanMessage

🤖 Automated check

This check is based on the latest analysis of langchain re-exports from langchain_core.

Mason Daugherty (mdrxy) added a commit to langchain-ai/langchain that referenced this pull request Jun 10, 2026
@aolsenjazz @open-swe @mdrxy
feat(langchain): add ProviderToolSearchMiddleware (#37969)
92ee772 
[Docs](langchain-ai/docs#4355)

Adds `ProviderToolSearchMiddleware` to let agents defer selected tools
behind OpenAI/Anthropic provider-native tool search while preserving
existing `extras={"defer_loading": True}` behavior. The middleware
validates searchable tool names, injects the provider search tool only
when a tool is deferred, and rejects unsupported providers up front.

Made by [Open SWE](https://openswe.vercel.app)

---------

Co-authored-by: Alexander Olsen <13665641+aolsenjazz@users.noreply.github.com>
Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>
Co-authored-by: Mason Daugherty <github@mdrxy.com>
Co-authored-by: Mason Daugherty <mason@langchain.dev>
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github-actions Bot commented Jun 10, 2026

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Mintlify preview branch generated: preview-alexpr-1781114723-5d436be

Site preview: https://langchain-5e9cc07a-preview-alexpr-1781114723-5d436be.mintlify.app

Important

Preview links may take a few minutes to start working while the deployment finishes.

Changed documentation pages (preview deep links):

@mdrxy Mason Daugherty (mdrxy) merged commit b4e3d54 into main Jun 10, 2026
21 checks passed
@mdrxy Mason Daugherty (mdrxy) deleted the alex/provider-tool-search-middleware branch June 10, 2026 18:06
npentrel
Naomi Pentrel (npentrel) reviewed Jun 11, 2026
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Comment thread src/oss/langchain/middleware/built-in.mdx
</Accordion>

:::python
### Provider tool search

@npentrel Naomi Pentrel (npentrel) Jun 11, 2026

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ideally this would be outside of these blocks so that it's always the same heading.

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Reviewers

@npentrel Naomi Pentrel (npentrel) npentrel left review comments
@hntrl Hunter Lovell (hntrl) hntrl approved these changes
@mdrxy Mason Daugherty (mdrxy) mdrxy approved these changes

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@aolsenjazz @npentrel @hntrl @mdrxy