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Guide

Building Custom OpenClaw Skills: A Practical Developer Guide

Developer guide.

How to build custom OpenClaw skills. Practical guide to writing, testing, and safely deploying your own tools.

By Liyam Flexer, Founder & EditorPublished Last reviewed
At a glance
Type
Guide
Topics
OpenClaw, Custom skills, ClawHub
Evidence
Editorial interpretation
Written by
Liyam Flexer

The short answer

Build custom OpenClaw skills by defining a clear operational description, input schema, and execution logic that interfaces with local scripts, APIs, or Model Context Protocol (MCP) servers. Place private tools in .openclaw/skills/ within your workspace, enforce strict input validation, test in isolated sandboxes, and publish reusable packages to ClawHub after verification.

Custom skills let you extend OpenClaw with exactly the tools your workflow needs.

Basic Skill Structure

Skills are typically defined with a clear description, input schema, and execution logic. They can call external APIs, run local scripts, or interact with MCP servers. Place private skills in a workspace; publish reusable ones to ClawHub after testing.

Development Workflow

  1. Define the exact capability and required permissions.
  2. Write the skill with strict input validation.
  3. Test in a sandboxed or low-privilege session.
  4. Add clear error handling and logging.
  5. Document required configuration (API keys, etc.).
  6. Only then enable it for broader use.

Always assume a skill can be invoked with unexpected input. Limit blast radius by default.

Evidence in this article Editorial interpretation Our reading of what the evidence means. Judgment, clearly separated from the evidence itself.

Frequently asked questions

How do I structure a custom skill in OpenClaw?

A skill consists of metadata describing its capability, a JSON schema for inputs, and execution logic calling APIs or CLI tools.

Where should private workspace skills be saved?

Save private skills in the .openclaw/skills/ directory of your workspace to keep them scoped to that specific project.

Can OpenClaw skills use MCP servers?

Yes. Skills can wrap or directly communicate with external MCP servers via standardized JSON-RPC protocols.

Sources

  1. OpenClaw Skills Documentation OpenClaw Foundation, accessed .
  2. OpenClaw Plugin SDK OpenClaw Foundation, accessed .