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tooluniverse-custom-tool

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.

Packaged view

This page reorganizes the original catalog entry around fit, installability, and workflow context first. The original raw source lives below.

Stars
1,131
Hot score
99
Updated
March 20, 2026
Overall rating
C4.0
Composite score
4.0
Best-practice grade
C61.1

Install command

npx @skill-hub/cli install mims-harvard-tooluniverse-tooluniverse-custom-tool

Repository

mims-harvard/ToolUniverse

Skill path: skills/tooluniverse-custom-tool

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.

Open repository

Best for

Primary workflow: Ship Full Stack.

Technical facets: Full Stack, Backend, Integration.

Target audience: Development teams looking for install-ready agent workflows..

License: Unknown.

Original source

Catalog source: SkillHub Club.

Repository owner: mims-harvard.

This is still a mirrored public skill entry. Review the repository before installing into production workflows.

What it helps with

  • Install tooluniverse-custom-tool into Claude Code, Codex CLI, Gemini CLI, or OpenCode workflows
  • Review https://github.com/mims-harvard/ToolUniverse before adding tooluniverse-custom-tool to shared team environments
  • Use tooluniverse-custom-tool for development workflows

Works across

Claude CodeCodex CLIGemini CLIOpenCode

Favorites: 0.

Sub-skills: 0.

Aggregator: No.

tooluniverse-custom-tool | SkillHub