Will fetching live docs slow down Claude responses?

fetch_page is fast for a single URL, typically under a second. The trade-off is a slight delay in exchange for an answer grounded in the current version of the documentation rather than stale training data.

Does this work for private documentation behind a login?

If the documentation is behind authentication, crawler-mcp will receive the login page instead of the docs. Use the CLI or desktop app for authenticated crawls, or host the docs on a publicly accessible URL.

Can I chain multiple fetches in one prompt?

Yes. Ask Claude to fetch several related pages in sequence. The agent will call fetch_page for each URL and synthesise a coherent answer from all the fetched content.

How to Give Claude Up-to-Date Library Docs with MCP

Claude’s training data has a cutoff date. When you ask about a library released after that cutoff, Claude may hallucinate APIs or recommend deprecated patterns. With crawler-mcp, you can have Claude fetch the latest docs before answering, so every response is grounded in the current version.

This guide shows how to use fetch_page to pull live documentation into Claude’s context.

Step 1: Install crawler-mcp

Run the install script:

curl -fsSL https://install.crawler.sh/install-mcp.sh | sh

This downloads the correct binary for your platform to ~/.crawler/bin/crawler-mcp.

For more detail, see the installation guide.

Step 2: Wire it into your client

Step 3: Fetch the latest docs

Ask Claude to pull the current documentation before answering:

Before answering, use crawler-sh to fetch https://docs.example.com/latest/api and read the authentication section.

Claude calls fetch_page, receives the live Markdown, and bases its answer on the actual content.

Step 4: Fetch a changelog for version-specific questions

When you need to know what changed in a specific release:

Use crawler-sh to fetch https://docs.example.com/changelog and tell me what breaking changes were introduced in v3.

Claude reads the live changelog and gives you an accurate summary.

Step 5: Chain fetches for deep research

For complex questions that span multiple pages:

Use crawler-sh to fetch https://docs.example.com/installation, then https://docs.example.com/configuration, then summarise the setup steps.

Claude fetches each page in sequence and synthesises a coherent answer.