Agent Inspect
rajudandigam/agent-inspect
Local evidence debugger and trajectory-test toolkit for TypeScript AI agents.
Tools are how AI agents interact with the world. An agent skill from aiskillstore/marketplace.
Install Agent Tool Builder
$ npx skills add aiskillstore/marketplace --skill agent-tool-builder -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install aiskillstore/marketplace agent-tool-builder --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/aiskillstore/marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/sickn33/agent-tool-builder .claude/skills/agent-tool-builder && 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 "agent-tool-builder" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/agent-tool-builder into .claude/skills/agent-tool-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "agent-tool-builder", 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/aiskillstore/marketplace/tree/main/skills/sickn33/agent-tool-builderType 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 aiskillstore/marketplace --skill agent-tool-builder -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install aiskillstore/marketplace agent-tool-builder --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/sickn33/agent-tool-builder .agents/skills/agent-tool-builder && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "agent-tool-builder" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/agent-tool-builder into .agents/skills/agent-tool-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "agent-tool-builder", 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 aiskillstore/marketplace --skill agent-tool-builder -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install aiskillstore/marketplace agent-tool-builder --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/sickn33/agent-tool-builder .cursor/skills/agent-tool-builder && 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 "agent-tool-builder" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/agent-tool-builder into .cursor/skills/agent-tool-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "agent-tool-builder", 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/aiskillstore/marketplace.git --path skills/sickn33/agent-tool-builder--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 aiskillstore/marketplace --skill agent-tool-builder -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install aiskillstore/marketplace agent-tool-builder --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/sickn33/agent-tool-builder .gemini/skills/agent-tool-builder && 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 "agent-tool-builder" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/agent-tool-builder into .gemini/skills/agent-tool-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "agent-tool-builder", 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 aiskillstore/marketplace agent-tool-builderInstalls 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 aiskillstore/marketplace --skill agent-tool-builder -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/sickn33/agent-tool-builder .github/skills/agent-tool-builder && 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 "agent-tool-builder" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/agent-tool-builder into .github/skills/agent-tool-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "agent-tool-builder", 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 aiskillstore/marketplace --skill agent-tool-builder -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install aiskillstore/marketplace agent-tool-builder --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/sickn33/agent-tool-builder .opencode/skills/agent-tool-builder && 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 "agent-tool-builder" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/agent-tool-builder into .opencode/skills/agent-tool-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "agent-tool-builder", 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
agent-tool-builder- GitHub stars
- 430
- Used in
- 4 other repos
- Token cost
- ~4.8k tokens
- SKILL.md length
- 1,940 words
- Files
- 2
- Skills in repo
- 1,085
- Repo updated
- First seen
- Licence
- None found
At a glance
Tools are how AI agents interact with the world. An agent skill from aiskillstore/marketplace.
- Works in 4 steps: Detailed Descriptions (Most Important) → Parameter Descriptions → Use Enums When Possible → …
- Tasks that involve Error handling
- SKILL.md covers Principles, Capabilities, Scope and Tooling, plus 10 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Agent Tool Builder is an agent skill from aiskillstore/marketplace. Tools are how AI agents interact with the world. A well-designed tool is the difference between an agent that works and one that hallucinates, fails silently, or costs 10x more tokens than necessary. This skill covers tool design from schema to error handling.
Its SKILL.md is about 4.8k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `skill-report.json`).
It sits in AI & LLM Engineering, covering Error handling. It works with Model Context Protocol and LangChain. The repository describes itself as: Security-audited skills for Claude, Codex & Claude Code. One-click install, quality verified.
When your agent uses it
- Tasks that involve Error handling
Example prompts
- “Use the agent-tool-builder skill to tool are how AI agents interact with the world. An agent skill from aiskillstore/marketplace”
- “/agent-tool-builder”
Requirements
- Python 3
Workflow steps
4 steps, taken from the step headings in SKILL.md.
- Detailed Descriptions (Most Important)
- Parameter Descriptions
- Use Enums When Possible
- Required vs Optional
What it can do on your machine
Read from SKILL.md and the folder at commit 4ac52da. 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
Agent Tool Builder loads about 4.8k tokens when it runs. Until then it costs about 70 tokens; SKILL.md has 1,940 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
Without a licence we can't republish the file, so here is its outline and opening line. It has 1,940 words (~4,769 tokens).
“Tools are how AI agents interact with the world. A well-designed tool is the difference between an agent that works and one that hallucinates, fails silently, or costs 10x more tokens than necessary.”
- name
- agent-tool-builder
- risk
- unknown
- source
- vibeship-spawner-skills (Apache 2.0)
- date_added
- 2026-02-27
Files
SKILL.md and 1 other file in skills/sickn33/agent-tool-builder of aiskillstore/marketplace.
- SKILL.md
- skill-report.json
Open the folder on GitHubat commit 4ac52da
Used in 4 other repositories
We found 11 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 4 other GitHub owners. This page covers the copy in aiskillstore/marketplace, which our catalogue first saw on October 7, 2026.
- majiayu000/claude-skill-registryskills/ai-llm/agent-tool-builderskills/agent/agent-tool-builder-sickn33-antigravity-awesome
- sickn33/agentic-awesome-skillsskills/agent-tool-builderplugins/agentic-awesome-skills/skills/agent-tool-builder+1 more
- lingxling/awesome-skills-cnantigravity-awesome-skills/skills/agent-tool-builderantigravity-awesome-skills/plugins/agentic-awesome-skills/skills/agent-tool-builder+1 more
- henryalouf/ruflow.agents/skills/agent-tool-buildersrc/antigravity-awesome-skills/plugins/antigravity-awesome-skills/skills/agent-tool-builder+1 more
Compare with similar skills
Agent Tool Builder 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 |
|---|---|---|---|---|---|---|
| Agent Tool Builder this skillaiskillstore/marketplace | 430 | 4 repos | ~4.8k | Automated safety check: Pass | None | |
| Agent Inspectrajudandigam/agent-inspect | 165 | — | ~424 | Automated safety check: Pass | MIT | |
| Chemgraphargonne-lcf/ChemGraph | 162 | — | ~2.7k | Automated safety check: Pass | Apache-2.0 | |
| Agent Tool Builderomer-metin/skills-for-antigravity | 162 | — | ~705 | Automated safety check: Pass | Apache-2.0 | |
| SynalinksSynaLinks/synalinks-skills | 907 | — | ~4.8k | Automated safety check: Pass | Apache-2.0 | |
| Dive Into LangGraphluochang212/dive-into-langgraph | 457 | — | ~837 | Automated safety check: Notes | Custom licence |
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Questions about Agent Tool Builder
What does Agent Tool Builder do?
Tools are how AI agents interact with the world. An agent skill from aiskillstore/marketplace. Agent Tool Builder is an agent skill from aiskillstore/marketplace. Tools are how AI agents interact with the world.
When should I use Agent Tool Builder?
Agent Tool Builder fits situations like: tasks that involve Error handling.
How do I install Agent Tool Builder in Claude Code?
Run `npx skills add aiskillstore/marketplace --skill agent-tool-builder -a claude-code`. Or copy the skill folder (skills/sickn33/agent-tool-builder in aiskillstore/marketplace) into .claude/skills/agent-tool-builder in your project. Claude Code loads it when a task matches its description.
How do I install Agent Tool Builder in Codex?
Run `npx skills add aiskillstore/marketplace --skill agent-tool-builder -a codex`. Or copy the skill folder (skills/sickn33/agent-tool-builder in aiskillstore/marketplace) into .agents/skills/agent-tool-builder in your project. Codex loads it when a task matches its description.
Can I use Agent Tool Builder 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 aiskillstore/marketplace --skill agent-tool-builder -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/agent-tool-builder, .gemini/skills/agent-tool-builder, .github/skills/agent-tool-builder and .opencode/skills/agent-tool-builder in your project.
What does Agent Tool Builder need to run?
SKILL.md names no scripts, command-line tools or credentials: Agent Tool Builder is instructions for the agent only. Our summary lists: Python 3.
Does Agent Tool Builder 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 Agent Tool Builder 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 Agent Tool Builder use?
No licence was found for Agent Tool Builder or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Agent Tool Builder use?
About 4.8k tokens (SKILL.md is roughly 19k 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 Agent Tool Builder?
Skills that share tags, products or a category with Agent Tool Builder: Agent Inspect (rajudandigam/agent-inspect, 165 stars), Chemgraph (argonne-lcf/ChemGraph, 162 stars), Agent Tool Builder (omer-metin/skills-for-antigravity, 162 stars) and Synalinks (SynaLinks/synalinks-skills, 907 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Agent Tool Builder?
aiskillstore (a GitHub organization) maintains it in aiskillstore/marketplace, which has 430 GitHub stars. The repository holds 1,085 skills in this directory. The repository was last updated on October 7, 2026.
Source: aiskillstore/marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.