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I Built 132 Free Online Tools Because I Kept Searching for Them

As a developer, I constantly end up searching for small tools to do random things. Format JSON, decode JWTs, generate UUIDs, encode URLs, compare text, convert data, and so on. I got tired of opening a different website every time, so I started building my own collection. That's CtrlTool. It currently has 132 free tools for developers and everyday tasks, with a focus on keeping them fast, simple,…

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MCP x-mcp-header Validation: Keep Bad Tool Schemas Out of tools/list

MCP x-mcp-header validation is easy to miss because the annotation looks like ordinary JSON Schema metadata. On the 2026-07-28 Streamable HTTP transport, it is a wire contract: the client copies…

  • MCP x-mcp-header validation prevents bad tool schemas
  • Annotations must be non-empty HTTP field-name tokens
  • Invalid tools excluded from tools/list results

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