Claude Code Agent Development
anthropics/claude-plugins-official
Explains how to write agents for Claude Code plugins: the markdown file with YAML frontmatter, trigger descriptions, model and color settings, and system prompt design.
“Create a plan for the specified task.”
$ npx skills add CodelyTV/agent-harness --skill codely-plan-create-subagents -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install CodelyTV/agent-harness codely-plan-create-subagents --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/CodelyTV/agent-harness.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/codely-plan-create .claude/skills/codely-plan-create-subagents && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "codely-plan-create-subagents" agent skill from https://github.com/CodelyTV/agent-harness/tree/main/.agents/skills/codely-plan-create into .claude/skills/codely-plan-create-subagents/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "codely-plan-create-subagents", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/CodelyTV/agent-harness/tree/main/.agents/skills/codely-plan-createType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add CodelyTV/agent-harness --skill codely-plan-create-subagents -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install CodelyTV/agent-harness codely-plan-create-subagents --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/CodelyTV/agent-harness.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/codely-plan-create .agents/skills/codely-plan-create-subagents && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "codely-plan-create-subagents" agent skill from https://github.com/CodelyTV/agent-harness/tree/main/.agents/skills/codely-plan-create into .agents/skills/codely-plan-create-subagents/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "codely-plan-create-subagents", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add CodelyTV/agent-harness --skill codely-plan-create-subagents -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install CodelyTV/agent-harness codely-plan-create-subagents --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/CodelyTV/agent-harness.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/codely-plan-create .cursor/skills/codely-plan-create-subagents && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "codely-plan-create-subagents" agent skill from https://github.com/CodelyTV/agent-harness/tree/main/.agents/skills/codely-plan-create into .cursor/skills/codely-plan-create-subagents/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "codely-plan-create-subagents", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/CodelyTV/agent-harness.git --path .agents/skills/codely-plan-create--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add CodelyTV/agent-harness --skill codely-plan-create-subagents -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install CodelyTV/agent-harness codely-plan-create-subagents --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/CodelyTV/agent-harness.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/codely-plan-create .gemini/skills/codely-plan-create-subagents && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "codely-plan-create-subagents" agent skill from https://github.com/CodelyTV/agent-harness/tree/main/.agents/skills/codely-plan-create into .gemini/skills/codely-plan-create-subagents/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "codely-plan-create-subagents", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install CodelyTV/agent-harness codely-plan-create-subagentsInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add CodelyTV/agent-harness --skill codely-plan-create-subagents -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/CodelyTV/agent-harness.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/codely-plan-create .github/skills/codely-plan-create-subagents && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "codely-plan-create-subagents" agent skill from https://github.com/CodelyTV/agent-harness/tree/main/.agents/skills/codely-plan-create into .github/skills/codely-plan-create-subagents/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "codely-plan-create-subagents", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add CodelyTV/agent-harness --skill codely-plan-create-subagents -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install CodelyTV/agent-harness codely-plan-create-subagents --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/CodelyTV/agent-harness.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/codely-plan-create .opencode/skills/codely-plan-create-subagents && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "codely-plan-create-subagents" agent skill from https://github.com/CodelyTV/agent-harness/tree/main/.agents/skills/codely-plan-create into .opencode/skills/codely-plan-create-subagents/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "codely-plan-create-subagents", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
codely-plan-create-subagentsCodely Plan Create Subagents is a skill in CodelyTV/agent-harness (282 stars). Its SKILL.md is about 1.1k tokens, with 1 other file in the folder. No licence found.
7 steps, taken from the first numbered list in SKILL.md.
Read from SKILL.md and the folder at commit e600f55. It shows what the files ask for, not the result of running them.
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Shell commands in SKILL.md call:
claudecursorFrom the folder's file list and the shell code blocks in SKILL.md.
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Codely Plan Create Subagents loads about 1.1k tokens when it runs. Until then it costs about 17 tokens; SKILL.md has 548 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
Without a licence we can't republish the file, so here is its outline and opening line. It has 548 words (~1,110 tokens).
“The structure of a plan, its sections and the rules to shape them are defined in resources/plan-guidelines.md. Read it before proposing anything.”
SKILL.md and 1 other file in .agents/skills/codely-plan-create of CodelyTV/agent-harness.
Open the folder on GitHubat commit e600f55
Codely Plan Create Subagents next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Codely Plan Create Subagents this skillCodelyTV/agent-harness | 282 | — | ~1.1k | Automated safety check: Pass | None | |
| Claude Code Agent Developmentanthropics/claude-plugins-official | 38k | 7 repos | ~2.8k | Automated safety check: Pass | Apache-2.0 | |
| Subagent Driven DevelopmentAsvarox/allkaraoke | 261 | 37 repos | ~1.2k | Automated safety check: Pass | None | |
| Dispatching Parallel Agentsultralisp/ultralisp | 258 | 40 repos | ~1.5k | Automated safety check: Pass | None | |
| Paseo Advisor Second Opiniongetpaseo/paseo | 20k | 1 repos | ~756 | Automated safety check: Pass | Custom licence | |
| Task Observerrebelytics/one-skill-to-rule-them-all | 3.2k | 1 repos | ~11k | Automated safety check: Pass | CC-BY-4.0 |
anthropics/claude-plugins-official
Explains how to write agents for Claude Code plugins: the markdown file with YAML frontmatter, trigger descriptions, model and color settings, and system prompt design.
Asvarox/allkaraoke
A skill your agent uses when executing implementation plans with independent tasks in the current session
ultralisp/ultralisp
A skill your agent uses when facing 2+ independent tasks that can be worked on without shared state or sequential dependencies
getpaseo/paseo
Launches one separate agent through Paseo to give a second opinion on the current task, with a self-contained briefing and no permission to edit files.
rebelytics/one-skill-to-rule-them-all
Monitors task execution for skill improvement opportunities.
openobserve/openobserve
Splits a change into planner, coder and independent reviewer roles: you confirm a spec, a subagent implements it, and a separate reviewer checks each round's local WIP commit.
CodelyTV/agent-harness
Create new documentation based on the current conversation context.
CodelyTV/agent-harness
Create a plan for the specified task and store it as GitHub issues in the repository of the current working directory.
Categories
Run `npx skills add CodelyTV/agent-harness --skill codely-plan-create-subagents -a claude-code`. Or copy the skill folder (.agents/skills/codely-plan-create in CodelyTV/agent-harness) into .claude/skills/codely-plan-create-subagents in your project. Claude Code loads it when a task matches its description.
Run `npx skills add CodelyTV/agent-harness --skill codely-plan-create-subagents -a codex`. Or copy the skill folder (.agents/skills/codely-plan-create in CodelyTV/agent-harness) into .agents/skills/codely-plan-create-subagents in your project. Codex loads it when a task matches its description.
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add CodelyTV/agent-harness --skill codely-plan-create-subagents -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/codely-plan-create-subagents, .gemini/skills/codely-plan-create-subagents, .github/skills/codely-plan-create-subagents and .opencode/skills/codely-plan-create-subagents in your project.
Going by SKILL.md and its folder, Codely Plan Create Subagents needs the command-line tools its instructions call (claude and cursor).
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
No licence was found for Codely Plan Create Subagents or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
About 1.1k tokens (SKILL.md is roughly 4.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
Skills that share tags, products or a category with Codely Plan Create Subagents: Claude Code Agent Development (anthropics/claude-plugins-official, 38k stars), Subagent Driven Development (Asvarox/allkaraoke, 261 stars), Dispatching Parallel Agents (ultralisp/ultralisp, 258 stars) and Paseo Advisor Second Opinion (getpaseo/paseo, 20k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
CodelyTV (a GitHub organization) maintains it in CodelyTV/agent-harness, which has 282 GitHub stars. The repository holds 3 skills in this directory. The repository was last updated on August 6, 2026.
Source: CodelyTV/agent-harness on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.