JSONTech

MCP Tool Schema Validator

Validate MCP tool definitions and verify `inputSchema` before deployment

MCP Tool Definition

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Formatted Definition

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相关工具

Structured Output Schema Builder

Generate OpenAI, Anthropic, MCP, or plain JSON Schema wrappers from sample output

Anthropic Tool Input Builder

Build Claude tool definitions with `input_schema` from sample JSON input

JSON Schema 校验

按 JSON Schema 校验文档

API 探索

在浏览器中测试 REST API 并格式化 JSON

常见问题

It checks that your tool definition is valid JSON, confirms the required top-level fields are present, validates the embedded `inputSchema`, and reports both errors and warnings about the MCP shape.

No. It validates the JSON definition locally in your browser. It does not connect to a running MCP server or any third-party API.

Typical issues include missing `name`, a non-object `inputSchema`, invalid JSON Schema inside `inputSchema`, non-boolean annotation hints, and definitions that omit a useful description.

Yes. Paste the entire MCP tool definition, not only the `inputSchema`. The validator is designed to inspect the full object.