Borrowing it
Nothing to install: this file belongs to Codeblockz/langchain-community-plugin. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Codeblockz/langchain-community-plugin/main/CLAUDE.mdgit clone --depth 1 https://github.com/Codeblockz/langchain-community-pluginWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/codeblockz/langchain-community-plugin/claude-md)<a href="https://agentmods.dev/instructions/codeblockz/langchain-community-plugin/claude-md"><img src="https://agentmods.dev/badge/instructions/codeblockz/langchain-community-plugin/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/codeblockz/langchain-community-plugin/claude-md"><img src="https://agentmods.dev/badge/instructions/codeblockz/langchain-community-plugin/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00697 | $0.00697 |
| Opus 5.5 | $0.00279 | $0.00279 |
| Sonnet 5.5 | $0.00139 | $0.00139 |
| Haiku 4.5 | $0.00070 | $0.00070 |
Grade A, and why
langchain-community-plugin CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
Overview
This is a Claude Code plugin for LangChain and LangGraph development. It provides skills, commands, and reviewer agents to help build AI applications with best practices.
Plugin Structure
langchain-community-plugin/
├── .claude-plugin/
│ ├── plugin.json # Plugin manifest (name, version, keywords)
│ └── .mcp.json # MCP server configuration (LangChain docs)
├── skills/ # Core guidance loaded contextually
│ ├── langgraph/ # AI agents with StateGraph and create_agent
│ ├── langchain-rag/ # RAG pipelines with vector stores
│ └── langchain-chains/ # LCEL chains for summarization/extraction
├── commands/ # Slash commands for scaffolding
│ ├── new-agent.md # /langchain-community:new-agent
│ ├── add-tool.md # /langchain-community:add-tool
│ ├── new-rag.md # /langchain-community:new-rag
│ └── new-chain.md # /langchain-community:new-chain
└── agents/ # Reviewer subagents (haiku model)
├── langgraph-reviewer.md # Reviews agent code for common mistakes
└── rag-reviewer.md # Reviews RAG code for common mistakes
Architecture
Skills (skills/<name>/SKILL.md): Main guidance documents with YAML frontmatter containing name and description. Each skill has a references/ subdirectory with detailed documentation for specific patterns (e.g., state-patterns.md, vector-stores.md).
Commands (commands/<name>.md): Slash commands that scaffold new code. Use YAML frontmatter for command metadata.
Agents (agents/<name>.md): Reviewer agents that analyze code for issues. Configured with YAML frontmatter specifying name, description, model (haiku), color, and available tools.
MCP Servers (.claude-plugin/.mcp.json): Configures external MCP servers. The plugin includes the official LangChain docs MCP server (https://docs.langchain.com/mcp) for accessing up-to-date documentation directly.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 55 lines · 697 tokens per session scan A e043a6f9a548
langchain-community-plugin CLAUDE.md is an instructions file published in the GitHub repository Codeblockz/langchain-community-plugin (3 stars, last pushed 9mo ago), licensed Apache-2.0. It adds 697 tokens to every session, about $0.0028 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other instructions, from other repositories
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AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
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Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
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AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).