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LangChain Documentation Guidelines

Documentation for LangChain products hosted on Mintlify. These guidelines apply to manually authored docs only—not **/reference/** directories or build artifacts.

Critical rules

  1. Always ask for clarification rather than making assumptions
  2. Never use markdown in frontmatter description — breaks SEO
  3. Never edit reference/ directory — auto-generated
  4. Always update src/docs.json when adding new pages
  5. Use Tabler icons only — not FontAwesome
  6. Test code examples before including them

Quick reference

What Where/How
LangSmith docs src/langsmith/
Open source docs src/oss/ (LangChain, LangGraph, DeepAgents)
Python integrations src/oss/python/integrations/
JS integrations src/oss/javascript/integrations/
Reusable snippets src/snippets/
Images src/images/
Provider icons src/images/providers/
Navigation config src/docs.json
API reference (auto-generated) reference/ — do not edit
Build system pipeline/
Icon library Tabler — https://tabler.io/icons
Mintlify components https://mintlify.com/docs/components
Mintlify MCP server npx add-mcp https://www.mintlify.com/docs/mcp

Local development

See Contributing to documentation for setup instructions.

Frontmatter

Every MDX file requires:

---
title: Clear, concise page title
description: SEO summary — no markdown allowed (no links, backticks, formatting)
---

Integration page descriptions: "Integrate with the ClassName type using LangChain Python."

  • Example: "Integrate with the ChatOpenAI chat model using LangChain Python."

Syntax

Language-specific content

Use :::python or :::js fences for language-specific content. Pages with these fences generate separate Python and JavaScript versions.

:::python
Python-only content here
:::

Code highlighting

highlighted = True  # [!code highlight]
added = True        # [!code ++]
removed = True      # [!code --]

API reference links

Use @[ClassName] to auto-link to API docs. Defined in pipeline/preprocessors/link_map.py.

Use for: First mention of SDK classes/methods (@[ChatOpenAI], @[StateGraph], @[create_agent])

Don't use for: Repeated mentions, general concepts, or when a descriptive link is clearer

Assets

Images: Store in src/images/. Use descriptive filenames and alt text.

Icons: Use Tabler names only (icon="home", icon="brand-github"). For missing icons, use SVG path: icon="/images/providers/name.svg"

Common Tabler names: home (not house), tool (not wrench), player-play (not play), bulb (not lightbulb), alert-triangle (not exclamation-triangle)

Components

Component Use for
<Tabs> / <Tab> Python/JS examples
<Steps> / <Step> Numbered instructions
<Accordion> Collapsible content
<CodeGroup> Tabbed code blocks
<Card> / <CardGroup> Navigation/overview links only (not for highlighting points)
<Note>, <Tip>, <Warning>, <Info> Callouts

Style guide

Follow Google Developer Documentation Style Guide.

Do:

  • Reference existing pages for style patterns when creating new content
  • Be concise — no hyperbolic or redundant language
  • Second-person imperative present tense ("Run the following code…")
  • Sentence-case headings starting with active verb, not gerund ("Add a tool" not "Adding a tool")
  • American English spelling
  • Add cross-links where applicable
  • Use @[ClassName] link map for API references
  • Use :::python/:::js fencing on OSS docs
  • Language tags on all code blocks (use actual language, not output)
  • Test code examples and links before publishing

Don't:

  • Skip frontmatter
  • Use absolute URLs for internal links
  • Use markdown in description fields
  • Use /python/ or /javascript/ in links (resolved by build pipeline)
  • Use model aliases — use full identifiers (e.g., claude-sonnet-4-6)
  • Use FontAwesome icon names
  • Use nested double quotes in component attributes — use default="['a', 'b']" not default='["a", "b"]'
  • Use H5 or H6 headings
  • Use excessive bold/italics in body text
  • Include "key features" lists
  • Use horizontal lines

Adding pages

  1. Create MDX file with required frontmatter
  2. Update src/docs.json to add to navigation
  3. For new groups, include index: "pages": ["group/index", "group/page"]

Pull requests

  • Explain the "why" of changes
  • Highlight areas needing careful review
  • Disclose AI agent involvement in description