tooluniverse-custom-tool

Three ways to add tools — pick the one that fits your needs:

| JSON config | REST API with standard request/response — no coding needed | | Python class (workspace) | Custom logic for local/private use only | | Plugin package | Reusable tools you want to share or install via pip |

Tools in .tooluniverse/tools/ are auto-discovered at startup. No installation needed.

Add custom local tools to ToolUniverse and use them alongside the 1000+ built-in tools. Use this skill when a user wants to: create their own tool for a private or custom API, add a local tool to their workspace, integrate an internal service with ToolUniverse, or use a custom tool via the MCP server or Python API. Covers both the JSON config approach (easiest, no Python needed) and the Python class approach (full control). Also covers how to verify tools loaded correctly and how to call them. Also covers the plugin package approach for reusable, shareable, pip-installable tool sets. Source: mims-harvard/tooluniverse.