Tool Discovery & Invocation Lab

See how an MCP client initializes with a server, discovers tool contracts through tools/list, and invokes a capability through tools/call across a protocol boundary.

GuidedNo API keys in LabMCP

Measured case

Select a recorded MCP protocol run. The Lab replays frozen traces — it does not call an MCP server.

Discover ToolsThe client initializes and asks the server what tools it provides.Invoke a ToolThe client discovers the tools and invokes one valid tool.Discover Multiple ToolsThe server exposes multiple tools and the client discovers and invokes the selected capability.Invalid ArgumentsThe client invokes a discovered tool with invalid arguments and the server rejects the request.

Choose a case and run the recorded MCP protocol interaction.

Related Labs

Tool Calling is application-owned invocation. MCP is a protocol for discovering and invoking server capabilities — not Tool Calling #2.

Tool Calling — application-owned tool invocation
Agent Loop — application-owned decide → act → observe loop

Continue Learning

Guides that explain MCP, tools, and agents as related but distinct ideas.

Implementation

Run the measured Cookbook example locally.

MCP Tool Discovery Cookbook

Related Tools

Tools commonly used with MCP hosts and clients.

Related Rankings

See how this stack compares in DataAIHub rankings.

Best AI Agent Frameworks

Lab ID mcp-tool-discovery · guided / precomputed