Fail-Closed Agent Tool Builder
simbajigege/book2skills
Helps define agent tools with a fail-closed pattern: one class holding name, schema, security flags and a validate, permission and call execution chain.
A skill your agent uses when you learn one or more design pattern(s) in the Langroid (multi) agent framework, and want to make a note for future reference for yourself.
Install Add Pattern
$ npx skills add pchalasani/claude-code-tools --skill add-pattern -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install pchalasani/claude-code-tools add-pattern --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/pchalasani/claude-code-tools.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/langroid/skills/add-pattern .claude/skills/add-pattern && 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 "add-pattern" agent skill from https://github.com/pchalasani/claude-code-tools/tree/main/plugins/langroid/skills/add-pattern into .claude/skills/add-pattern/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-pattern", 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/pchalasani/claude-code-tools/tree/main/plugins/langroid/skills/add-patternType 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 pchalasani/claude-code-tools --skill add-pattern -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install pchalasani/claude-code-tools add-pattern --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/pchalasani/claude-code-tools.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/langroid/skills/add-pattern .agents/skills/add-pattern && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "add-pattern" agent skill from https://github.com/pchalasani/claude-code-tools/tree/main/plugins/langroid/skills/add-pattern into .agents/skills/add-pattern/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-pattern", 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 pchalasani/claude-code-tools --skill add-pattern -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install pchalasani/claude-code-tools add-pattern --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/pchalasani/claude-code-tools.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/langroid/skills/add-pattern .cursor/skills/add-pattern && 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 "add-pattern" agent skill from https://github.com/pchalasani/claude-code-tools/tree/main/plugins/langroid/skills/add-pattern into .cursor/skills/add-pattern/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-pattern", 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/pchalasani/claude-code-tools.git --path plugins/langroid/skills/add-pattern--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 pchalasani/claude-code-tools --skill add-pattern -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install pchalasani/claude-code-tools add-pattern --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/pchalasani/claude-code-tools.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/langroid/skills/add-pattern .gemini/skills/add-pattern && 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 "add-pattern" agent skill from https://github.com/pchalasani/claude-code-tools/tree/main/plugins/langroid/skills/add-pattern into .gemini/skills/add-pattern/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-pattern", 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 pchalasani/claude-code-tools add-patternInstalls 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 pchalasani/claude-code-tools --skill add-pattern -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/pchalasani/claude-code-tools.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/langroid/skills/add-pattern .github/skills/add-pattern && 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 "add-pattern" agent skill from https://github.com/pchalasani/claude-code-tools/tree/main/plugins/langroid/skills/add-pattern into .github/skills/add-pattern/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-pattern", 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 pchalasani/claude-code-tools --skill add-pattern -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install pchalasani/claude-code-tools add-pattern --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/pchalasani/claude-code-tools.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/langroid/skills/add-pattern .opencode/skills/add-pattern && 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 "add-pattern" agent skill from https://github.com/pchalasani/claude-code-tools/tree/main/plugins/langroid/skills/add-pattern into .opencode/skills/add-pattern/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-pattern", 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.
Facts
- Skill name
add-pattern- GitHub stars
- 2k
- Token cost
- ~258 tokens
- SKILL.md length
- 110 words
- Files
- 1
- Skills in repo
- 17
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when you learn one or more design pattern(s) in the Langroid (multi) agent framework, and want to make a note for future reference for yourself.
- Works in 2 steps: Add an entry in the sibling… → In that DOCUMENT, describe the idea of…
- More design pattern(s) in the Langroid (multi) agent framework
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Want to make a note for future reference for yourself
What it does
Add Pattern is an agent skill from pchalasani/claude-code-tools. Use this skill when you learn one or more design pattern(s) in the Langroid (multi) agent framework, and want to make a note for future reference for yourself. Use this either autonomously, or when asked by the user to record a new pattern.
Its SKILL.md is about 260 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Development, covering Design patterns and Building AI agents. The repository describes itself as: Practical productivity tools for Claude Code, Codex-CLI, and similar CLI coding agents. The licence is MIT.
When your agent uses it
- More design pattern(s) in the Langroid (multi) agent framework
- Want to make a note for future reference for yourself
Example prompts
- “/add-pattern”
Workflow steps
2 steps, taken from the first numbered list in SKILL.md.
- Add an entry in the sibling patterns/SKILL.md file in the appropriate category
- In that DOCUMENT, describe the idea of the implementation along with code examples.
What it can do on your machine
Read from SKILL.md and the folder at commit 0ca7320. It shows what the files ask for, not the result of running them.
Tool permissions
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.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Add Pattern loads about 258 tokens when it runs. Until then it costs about 63 tokens; SKILL.md has 110 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.
Safety
Auto-check passed
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.
SKILL.md
The full file from pchalasani/claude-code-tools at commit 0ca7320, republished under its MIT licence (© pchalasani). 110 words, ~258 tokens.
Download SKILL.mdSave it as
.claude/skills/add-pattern/SKILL.md (or your agent's skills folder).- name
- add-pattern
- description
- Use this skill when you learn one or more design pattern(s) in the Langroid (multi) agent framework, and want to make a note for future reference for yourself. Use this either autonomously, or when asked by the user to record a new pattern.
add-pattern
Instructions
When you learn a new Langroid design pattern, do the following:
Add an entry in the sibling
patterns/SKILL.mdfile in the appropriate category section, containing a DESCRIPTION of the goal of the pattern (i.e. what it enables you to implement), accompanied by a- Reference:pointer to a markdown DOCUMENT in thepatterns/directory.IMPORTANT - The DESCRIPTION should be clear enough that future YOU can effectively use it to MATCH design problems you may encounter in future.
In that DOCUMENT, describe the idea of the implementation along with code examples. Follow the format of existing pattern files (Problem, Solution, Complete Code Example, Key Points, When to Use).
© pchalasani, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in plugins/langroid/skills/add-pattern of pchalasani/claude-code-tools.
Open the folder on GitHubat commit 0ca7320
Compare with similar skills
Add Pattern 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 |
|---|---|---|---|---|---|---|
| Add Pattern this skillpchalasani/claude-code-tools | 2k | — | ~258 | Automated safety check: Pass | MIT | |
| Fail-Closed Agent Tool Buildersimbajigege/book2skills | 184 | — | ~2k | Automated safety check: Pass | Custom licence | |
| Autonomous Agent Patternsdavila7/claude-code-templates | 32k | 8 repos | ~5.6k | Automated safety check: Pass | MIT | |
| Pydanticaimagnus919/agent-skills | 113 | — | ~4k | Automated safety check: Pass | MIT | |
| Vercel Composition Patternssupabase/supabase | 111k | 59 repos | ~726 | Automated safety check: Pass | MIT | |
| Swiftui View RefactorDimillian/Skills | 4k | 5 repos | ~2k | Automated safety check: Pass | MIT |
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Questions about Add Pattern
What does Add Pattern do?
A skill your agent uses when you learn one or more design pattern(s) in the Langroid (multi) agent framework, and want to make a note for future reference for yourself. Add Pattern is an agent skill from pchalasani/claude-code-tools. Use this skill when you learn one or more design pattern(s) in the Langroid (multi) agent framework, and want to make a note for future reference for yourself.
When should I use Add Pattern?
Add Pattern fits situations like: more design pattern(s) in the Langroid (multi) agent framework; want to make a note for future reference for yourself.
How do I install Add Pattern in Claude Code?
Run `npx skills add pchalasani/claude-code-tools --skill add-pattern -a claude-code`. Or copy the skill folder (plugins/langroid/skills/add-pattern in pchalasani/claude-code-tools) into .claude/skills/add-pattern in your project. Claude Code loads it when a task matches its description.
How do I install Add Pattern in Codex?
Run `npx skills add pchalasani/claude-code-tools --skill add-pattern -a codex`. Or copy the skill folder (plugins/langroid/skills/add-pattern in pchalasani/claude-code-tools) into .agents/skills/add-pattern in your project. Codex loads it when a task matches its description.
Can I use Add Pattern in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add pchalasani/claude-code-tools --skill add-pattern -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/add-pattern, .gemini/skills/add-pattern, .github/skills/add-pattern and .opencode/skills/add-pattern in your project.
What does Add Pattern need to run?
SKILL.md names no scripts, command-line tools or credentials: Add Pattern is instructions for the agent only.
Does Add Pattern access the network?
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.
Is Add Pattern safe to install?
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.
What licence does Add Pattern use?
Add Pattern is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Add Pattern use?
About 258 tokens (SKILL.md is roughly 1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Add Pattern?
Skills that share tags, products or a category with Add Pattern: Fail-Closed Agent Tool Builder (simbajigege/book2skills, 184 stars), Autonomous Agent Patterns (davila7/claude-code-templates, 32k stars), Pydanticai (magnus919/agent-skills, 113 stars) and Vercel Composition Patterns (supabase/supabase, 111k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Add Pattern?
pchalasani (a GitHub user) maintains it in pchalasani/claude-code-tools, which has 2,010 GitHub stars. The repository holds 17 skills in this directory. The repository was last updated on October 5, 2026.
Source: pchalasani/claude-code-tools on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.