WebMCP Tool Schema Design

Before writing code

Fetch live docs:

1. Fetch https://webmachinelearning.github.io/webmcp/ for the inputSchema specification and any constraints
2. Web-search webmcp inputSchema JSON Schema requirements for schema format details
3. Web-search JSON Schema draft specification for the JSON Schema version used by WebMCP
4. Web-search webmcp tool schema best practices for community guidance

Conceptual Architecture

Role of Schemas in WebMCP

The inputSchema in a tool definition serves two purposes:

1. Agent guidance — The agent reads the schema to understand what parameters to provide
2. Input validation — The browser validates agent-provided input against the schema before calling execute

Schema Structure