Agent Skills (original) (raw)

Define reusable behavior via SKILL.md definitions

Agent skills let OpenCode discover reusable instructions from your repo or home directory. Skills are loaded on-demand via the native skill tool—agents see available skills and can load the full content when needed.

Place files

Create one folder per skill name and put a SKILL.md inside it. OpenCode searches these locations:

• Project config: .opencode/skills/<name>/SKILL.md
• Global config: ~/.config/opencode/skills/<name>/SKILL.md
• Project Claude-compatible: .claude/skills/<name>/SKILL.md
• Global Claude-compatible: ~/.claude/skills/<name>/SKILL.md
• Project agent-compatible: .agents/skills/<name>/SKILL.md
• Global agent-compatible: ~/.agents/skills/<name>/SKILL.md

Understand discovery

For project-local paths, OpenCode walks up from your current working directory until it reaches the git worktree. It loads any matching skills/*/SKILL.md in .opencode/ and any matching .claude/skills/*/SKILL.md or .agents/skills/*/SKILL.md along the way.

Global definitions are also loaded from ~/.config/opencode/skills/*/SKILL.md, ~/.claude/skills/*/SKILL.md, and ~/.agents/skills/*/SKILL.md.

Write frontmatter

Each SKILL.md must start with YAML frontmatter. Only these fields are recognized:

• name (required)
• description (required)
• license (optional)
• compatibility (optional)
• metadata (optional, string-to-string map)

Unknown frontmatter fields are ignored.

Validate names

name must:

• Be 1–64 characters
• Be lowercase alphanumeric with single hyphen separators
• Not start or end with -
• Not contain consecutive --
• Match the directory name that contains SKILL.md

Equivalent regex:

Follow length rules

description must be 1-1024 characters. Keep it specific enough for the agent to choose correctly.

Use an example

Create .opencode/skills/git-release/SKILL.md like this:

---

name: git-release

description: Create consistent releases and changelogs

license: MIT

compatibility: opencode

metadata:

  audience: maintainers

  workflow: github

---

## What I do

- Draft release notes from merged PRs

- Propose a version bump

- Provide a copy-pasteable `gh release create` command

## When to use me

Use this when you are preparing a tagged release.

Ask clarifying questions if the target versioning scheme is unclear.

OpenCode lists available skills in the skill tool description. Each entry includes the skill name and description:

<available_skills>

  <skill>

    <name>git-release</name>

    <description>Create consistent releases and changelogs</description>

  </skill>

</available_skills>

The agent loads a skill by calling the tool:

skill({ name: "git-release" })

Configure permissions

Control which skills agents can access using pattern-based permissions in opencode.json:

{

  "permission": {

    "skill": {

      "*": "allow",

      "pr-review": "allow",

      "internal-*": "deny",

      "experimental-*": "ask"

    }

  }

}

Patterns support wildcards: internal-* matches internal-docs, internal-tools, etc.

Override per agent

Give specific agents different permissions than the global defaults.

For custom agents (in agent frontmatter):

---

permission:

  skill:

    "documents-*": "allow"

---

For built-in agents (in opencode.json):

{

  "agent": {

    "plan": {

      "permission": {

        "skill": {

          "internal-*": "allow"

        }

      }

    }

  }

}

Completely disable skills for agents that shouldn’t use them:

For custom agents:

---

tools:

  skill: false

---

For built-in agents:

{

  "agent": {

    "plan": {

      "tools": {

        "skill": false

      }

    }

  }

}

When disabled, the <available_skills> section is omitted entirely.

Troubleshoot loading

If a skill does not show up:

1. Verify SKILL.md is spelled in all caps
2. Check that frontmatter includes name and description
3. Ensure skill names are unique across all locations
4. Check permissions—skills with deny are hidden from agents