oss(contributing): surface LLM policy on PR pages, add language policy (#2986)

Author: mdrxy

src/oss/contributing/code.mdx

@@ -854,6 +854,10 @@ Once your tests pass and code meets quality standards:
 3. Reference related issues using a [closing keyword](https://docs.github.com/en/issues/tracking-your-work-with-issues/using-issues/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword) (e.g., `Fixes #123`)
 4. Wait for CI checks to complete
 
+<Note>
+    If your PR includes AI-generated content, you must follow our [acceptable uses of LLMs](/oss/contributing/overview#acceptable-uses-of-llms) policy. PRs that appear to be low-effort, AI-generated spam will be closed without comment.
+</Note>
+
 <Warning>
     Address CI failures promptly. Maintainers may close PRs that do not pass CI within a reasonable timeframe.
 </Warning>

src/oss/contributing/documentation.mdx

@@ -63,6 +63,10 @@ If you are having issues with you local preview, try running `mint update` to en
 1. Run [quality checks](#run-quality-checks) before submitting.
 1. Create a pull request for review.
 
+<Note>
+    If your PR includes AI-generated content, you must follow our [acceptable uses of LLMs](/oss/contributing/overview#acceptable-uses-of-llms) policy.
+</Note>
+
 <Accordion title="Create a sharable preview build (LangChain team only)">
     When you create or update a PR, a [preview branch/ID](https://github.com/langchain-ai/docs/actions/workflows/create-preview-branch.yml) is automatically generated. A comment will be left on the PR with the ID.
 

src/oss/contributing/overview.mdx

@@ -129,3 +129,9 @@ The following guidelines must be met for Pull Requests that include AI-generated
 * The Pull Request must link to a issue or discussion where a solution has been approved by a maintainer.
 
 The maintainer reserves the right to close PRs without comment if the above are not met. **We will close pull requests and issues that appear to be low-effort, AI-generated spam.**
+
+## Language policy
+
+All contributions — issues, pull requests, code reviews, and discussions — must be in English. This keeps communications accessible and searchable across our global contributor base.
+
+If English isn't your first language, don't worry. We value clear communication over perfect grammar, and translation tools are welcome.

src/oss/contributing/publish-langchain.mdx

@@ -102,6 +102,10 @@ Make a fork of the [LangChain docs repository](https://github.com/langchain-ai/d
 
 Please be patient as we handle a large volume of PRs. We will review your PR as soon as possible and provide feedback or merge it. **Do not repeatedly tag maintainers about your PR.**
 
+<Note>
+    If your PR includes AI-generated content, you must follow our [acceptable uses of LLMs](/oss/contributing/overview#acceptable-uses-of-llms) policy.
+</Note>
+
 ---
 
 ## Next steps