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A Practical Guide to Extending OpenClaw
A developer-focused guide to writing your first OpenClaw skill — covering the anatomy of a skill, your development environment, writing and testing the code, and publishing it for others to use.
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Build Your First Skill
A skill is a small, self-contained program that gives OpenClaw a specific capability. When your assistant receives a message that requires a particular action — checking Jira, querying a database, sending a notification — it invokes the relevant skill and uses the result in its response.
Skills are intentionally narrow. A skill that checks your calendar does not also send emails. This separation makes skills testable, replaceable, and composable. When something breaks, it breaks in one place. When you want to add a capability, you add one skill, not modify a monolith.
Most skills are short — under two hundred lines. They communicate with OpenClaw over a defined interface and return structured data. If you can write a function that calls an API and returns JSON, you can write a skill.
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A skill is a small, self-contained program that gives OpenClaw a specific capability. When your assistant receives a message that requires a particular action — checking Jira, querying a database, sending a notification — it invokes the relevant skill and uses the result in its response.
Every skill has four components: a manifest, a handler, a schema, and documentation.
You need Node.js 18 or later, a code editor (VS Code is recommended), and a local OpenClaw installation to test against. You do not need to deploy anything to test a skill — OpenClaw loads skills from a local directory.
Start with something concrete: a skill that fetches the weather for a given city. This is a classic first skill because it involves an external API call, structured input, and structured output.
Test your skill at two levels: unit tests for the handler logic and integration tests against your running OpenClaw instance.
Once your skill works reliably, you can share it with the OpenClaw community by publishing to ClawHub at clawhub.ai.
Write a custom skill from scratch — even if you've never done it before.
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