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Written by Max Zeshut
Founder at Agentmelt
A catalog of available tools, APIs, and integrations that an AI agent can discover and use. Instead of hardcoding tool connections, a tool registry lets agents dynamically find the right tool for a task—similar to how MCP (Model Context Protocol) standardizes tool discovery. Tool registries describe each tool's capabilities, input/output schemas, authentication requirements, and usage limits, enabling agents to select and invoke tools intelligently.
An operations agent needs to look up a customer's subscription status. It queries the tool registry, finds three options: Stripe API (billing data), HubSpot CRM (account data), and the internal admin API (full customer record). The agent selects the Stripe API because the task only requires billing information and Stripe returns the fastest response.