Give dev documentation to LLMs via llms.txt

GUIDE.md

Give dev documentation to LLMs via llms.txt and MCP servers

Hi everyone ! I was tired of having bad output from my LLMs so I was looking for a way to improve its code.

Here is the trick :

You'll need :

• https://github.com/langchain-ai/mcpdoc
• https://llmstxthub.com/websites

llmstxt_config.yaml

# Configuration for mcp-mcpdoc server
# Each entry must have a llms_txt URL and optionally a name
- name: n8n
  llms_txt: https://raw.githubusercontent.com/YoanAncelly/unofficial-llmstxt/refs/heads/main/llmstxt/n8n/llms.txt

mcp.json

{
    "mcpServers": {
        "langgraph-docs-mcp": {
            "command": "uvx",
            "args": [
                "--from",
                "mcpdoc",
                "mcpdoc",
                "--yaml",
                "llms/llmstxt_config.yaml",
                "--allowed-domains",
                "https://docs.n8n.io",
                "--transport",
                "stdio"
            ],
            "alwaysAllow": [
                "list_doc_sources",
                "fetch_docs"
            ]
        }
    }
}

rules.txt

for ANY question about a technology in the tech stack below, use the langgraph-docs-mcp server to help answer -- 
+ call list_doc_sources tool to get the available llms.txt file
+ call fetch_docs tool to read it
+ reflect on the urls in llms.txt 
+ reflect on the input question 
+ call fetch_docs on any urls relevant to the question

Tech stack:
+ n8n