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IFNeed to configure the Fetch MCP server for use with Claude app or VS Code.

THENAdd the appropriate configuration block to Claude's settings or VS Code's user settings or .vscode/mcp.json file. Three methods are available: using uvx (recommended), Docker, or pip installation. Choose the method that fits your environment.

IFThe fetch server differentiates between model-initiated and user-initiated requests for user-agent header and robots.txt compliance.

THENTo customize behavior, add arguments to the server command: --ignore-robots-txt to bypass robots.txt, --user-agent=... for a custom user-agent, and --proxy-url=... for a proxy.

IFThe Fetch MCP server obeys robots.txt by default for tool calls, which may block access to some sites.

THENDisable robots.txt obedience by adding `--ignore-robots-txt` to the server arguments. This ensures the server can fetch content from sites that block automated access.

IFServer fails to initialize when no directories are provided via command-line arguments and the client does not support the Roots protocol or provides empty roots.

THENAlways specify at least one directory via command-line arguments when starting the filesystem server, or ensure the client supports the Roots protocol and provides at least one root directory. If using a client that supports Roots, verify that roots are sent during initialization.

IFThe environment requires web requests to go through a proxy server.

THENConfigure the Fetch MCP server to use a proxy by adding `--proxy-url=<proxy_url>` to the server arguments. Replace <proxy_url> with your proxy address.

IFThe default user-agent string may be blocked by some websites or you need to identify your service.

THENCustomize the user-agent by adding `--user-agent=YourUserAgent` to the server arguments. This allows you to set a specific user-agent string for all requests.

IFMCP server fails to start on Windows with 'npx' command error and 'Connection closed' (-32000) even though npx works in terminal

THENIn the MCP server configuration for Windows, ensure the Node.js bin directory is included in the environment PATH variable, or use the full path to the npx executable. Add an 'env' entry for PATH or set the 'command' to the full path of npx.

IFMCP server logs 'Method not found' error when client requests standard capabilities like tools/list, resources/list, or prompts/list.

THENEnsure the server implementation registers all required handlers using the MCP SDK's decorators or functions. For example, call `server.tool()` for each tool, `server.resource()` for each resource, and `server.prompt()` for each prompt before starting the server. Missing registration causes the server to respond with -32601 error.