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Extend Harness

Agent skill
1 skill
READMEOverview ↓

Use whenever the user asks the running agent to gain a new capability — phrasings like "build a tool", "add a hook", "give yourself X", "let me through you", or anything that extends the agent itself at runtime. Defines the plugin protocols, where to install them (.harness/ scopes), and the required test-through-tool-call iteration pattern. CRITICAL: "tool" here means a plugin the agent invokes via tool-calls — install it to a .harness/ directory; do NOT write a standalone CLI script in the working directory and do NOT modify the harness codebase under plugins/. Load this skill before acting on such a request rather than reverse-engineering the protocol from source.

Install with
Claude CodeCodexCursorGitHub CopilotGemini CLI

Supported by the Atlas install prompt. Skill-specific requirements vary.

Skill stats

Skills1CategoryEngineeringStars0

About this skill

Use whenever the user asks the running agent to gain a new capability — phrasings like "build a tool", "add a hook", "give yourself X", "let me through you", or anything that extends the agent itself at runtime. Defines the plugin protocols, where to install them (.harness/ scopes), and the required test-through-tool-call iteration pattern. CRITICAL: "tool" here means a plugin the agent invokes via tool-calls — install it to a .harness/ directory; do NOT write a standalone CLI script in the working directory and do NOT modify the harness codebase under plugins/. Load this skill before acting on such a request rather than reverse-engineering the protocol from source.

Quick start

  1. Copy the install prompt. Use the green button above this README.
  2. Send it to your agent. Paste it into your coding agent’s chat and send.
  3. Review the setup. Your agent checks the skill’s instructions, requirements, and installation scope.

Installation guide →

Review, license & listing details
Review the source before using this skill

This is an imported listing. We haven’t certified its safety, license, or compatibility. Skills may include executable scripts.

Automated security scan: Partial

Only SKILL.md was scanned. Supporting files and scripts were not checked. No safety grade has been assigned.

0 potential findings · Scanned 11/4/2026 · Scanner 0.2.1

Content SHA-256: 356c0a1c0e3fbbdfaa4f776933cc064e67b1a79cdd6778adaed4a09494a07358

About scan coverage and limitations
Original listing metadata

Original name

extend-harness

Original description

Use whenever the user asks the running agent to gain a new capability — phrasings like "build a tool", "add a hook", "give yourself X", "let me <do thing> through you", or anything that extends the agent itself at runtime. Defines the plugin protocols, where to install them (.harness/ scopes), and the required test-through-tool-call iteration pattern. CRITICAL: "tool" here means a plugin the agent invokes via tool-calls — install it to a .harness/ directory; do NOT write a standalone CLI script in the working directory and do NOT modify the harness codebase under plugins/. Load this skill before acting on such a request rather than reverse-engineering the protocol from source.

About this listing

Category
Engineering
Reported license
MIT
Listing language (estimated)
English
Review status
Not individually reviewed
Agent compatibility
Atlas installation supports Claude Code, Codex, and Cursor. Skill-specific dependencies and features are checked during setup.
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