mcp-use

View on GitHub Fetched 2026-07-02 3 related flows

Summary

A popular open library for connecting any LLM to any MCP server and building custom agents with tool access - the fastest path from zero to a working MCP-tool-using agent, with support for multi-server clients and restricted tool sets.

Key Takeaways

Fastest on-ramp: any LLM + any MCP server in a few lines
Restricting available tools per agent is built in - use it
Multi-server clients let one agent span tool domains

Reliability Note

Official repository of an actively maintained library.

Flows informed by this source

MCP & Tooling

Build Your First MCP Server

Stand up a working MCP server exposing your own tools, connect a client, and validate the full call loop.

01Choose tools worth exposing and set up the SDK

02Implement the server and tools

03Connect a host and verify discovery

+1 more steps to Done

Best forbuilders who have shipped a basic app before

4 steps90-120 minutesIntermediate

Start Route Details

MCP & Tooling

Deferred Tool Loading

Stop paying context for tools the task never needs: load a core set eagerly and expand the toolset on demand.

01Measure usage and pick the core

02Build the catalog and discovery

03Implement dynamic registration

+1 more steps to Done

Best forproduction-grade builds with strict verification

4 steps90-120 minutesAdvanced

Start Route Details

MCP & Tooling

Testing MCP Tools

Bring TDD discipline to MCP servers: unit-test handlers, protocol-test the surface, and contract-test against a real host.

01Separate logic from protocol glue

02Write the handler unit suite

03Add protocol and contract layers

+1 more steps to Done

Best forbuilders who have shipped a basic app before

4 steps60-90 minutesIntermediate

Start Route Details