MCP Server Builder
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
Validates all interactive skills in this repo against the Agent Skills spec, project conventions, and structural requirements.
Install Skill Tester
$ npx skills add pskoett/pskoett-ai-skills --skill skill-tester -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install pskoett/pskoett-ai-skills skill-tester --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/pskoett/pskoett-ai-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/skill-tester .claude/skills/skill-tester && 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 "skill-tester" agent skill from https://github.com/pskoett/pskoett-ai-skills/tree/main/skills/skill-tester into .claude/skills/skill-tester/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-tester", 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/pskoett/pskoett-ai-skills/tree/main/skills/skill-testerType 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 pskoett/pskoett-ai-skills --skill skill-tester -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install pskoett/pskoett-ai-skills skill-tester --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/pskoett/pskoett-ai-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/skill-tester .agents/skills/skill-tester && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "skill-tester" agent skill from https://github.com/pskoett/pskoett-ai-skills/tree/main/skills/skill-tester into .agents/skills/skill-tester/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-tester", 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 pskoett/pskoett-ai-skills --skill skill-tester -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install pskoett/pskoett-ai-skills skill-tester --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/pskoett/pskoett-ai-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/skill-tester .cursor/skills/skill-tester && 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 "skill-tester" agent skill from https://github.com/pskoett/pskoett-ai-skills/tree/main/skills/skill-tester into .cursor/skills/skill-tester/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-tester", 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/pskoett/pskoett-ai-skills.git --path skills/skill-tester--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 pskoett/pskoett-ai-skills --skill skill-tester -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install pskoett/pskoett-ai-skills skill-tester --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/pskoett/pskoett-ai-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/skill-tester .gemini/skills/skill-tester && 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 "skill-tester" agent skill from https://github.com/pskoett/pskoett-ai-skills/tree/main/skills/skill-tester into .gemini/skills/skill-tester/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-tester", 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 pskoett/pskoett-ai-skills skill-testerInstalls 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 pskoett/pskoett-ai-skills --skill skill-tester -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/pskoett/pskoett-ai-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/skill-tester .github/skills/skill-tester && 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 "skill-tester" agent skill from https://github.com/pskoett/pskoett-ai-skills/tree/main/skills/skill-tester into .github/skills/skill-tester/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-tester", 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 pskoett/pskoett-ai-skills --skill skill-tester -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install pskoett/pskoett-ai-skills skill-tester --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/pskoett/pskoett-ai-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/skill-tester .opencode/skills/skill-tester && 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 "skill-tester" agent skill from https://github.com/pskoett/pskoett-ai-skills/tree/main/skills/skill-tester into .opencode/skills/skill-tester/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-tester", 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
skill-tester- GitHub stars
- 314
- Token cost
- ~1.3k tokens
- SKILL.md length
- 483 words
- Files
- 2 (incl. scripts)
- Skills in repo
- 24
- Repo updated
- First seen
- Licence
- None found
At a glance
Validates all interactive skills in this repo against the Agent Skills spec, project conventions, and structural requirements.
- Works in 6 steps: Anthropic Spec Validation → Project Convention Checks → Instruction File Validation → …
- Skills have been added
- SKILL.md covers When to Use, Checks, Output Format and Running, plus 1 more section
- Runs Shell scripts from its folder; calls python3, bash and uv
What it does
Skill Tester is an agent skill from pskoett/pskoett-ai-skills. Validates all interactive skills in this repo against the Agent Skills spec, project conventions, and structural requirements. Runs quickvalidate.py, checks line limits, verifies cross-references, and tests hook scripts. Use when skills have been added or modified and you want to verify everything passes before committing or submitting.
Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including scripts (for example `scripts/run-tests.sh`).
It sits in Agent Workflows.
When your agent uses it
- Skills have been added
- Modified and you want to verify everything passes before committing
Example prompts
- “Use the skill-tester skill to validate all interactive skills in this repo against the Agent Skills spec, project conventions, and structural…”
- “/skill-tester”
Requirements
- Python 3
- A Bash shell
Workflow steps
6 steps, taken from the step headings in SKILL.md.
- Anthropic Spec Validation
- Project Convention Checks
- Instruction File Validation
- Hook Script Testing
- Plugin Skill Validation (agent-performed — not covered by run-tests.sh)
- Portable Agent Plugins Validation (agent-performed — not covered by run-tests.sh)
What it can do on your machine
Read from SKILL.md and the folder at commit 5a836dc. 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
Ships 1 file in scripts/ (Shell), which the agent can run.
Shell commands in SKILL.md call:
python3bashuv
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use uv, which can reach the network depending on how they are called.
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
Skill Tester loads about 1.3k tokens when it runs. Until then it costs about 88 tokens; SKILL.md has 483 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); the scripts in this folder are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 483 words (~1,283 tokens).
“Validates all interactive (non-CI) skills in this repo. Runs the Anthropic skill-creator's quick_validate.py plus project-specific checks.”
- name
- skill-tester
Files
SKILL.md and 1 other file (scripts) in skills/skill-tester of pskoett/pskoett-ai-skills.
- SKILL.md
- scripts/run-tests.sh
Open the folder on GitHubat commit 5a836dc
Compare with similar skills
Skill Tester 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 |
|---|---|---|---|---|---|---|
| Skill Tester this skillpskoett/pskoett-ai-skills | 314 | — | ~1.3k | Automated safety check: Pass | None | |
| MCP Server Builderanthropics/skills | 180k | 63 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| Hook Development for Claude Code Pluginsanthropics/claude-plugins-official | 38k | 10 repos | ~4.1k | Automated safety check: Notes | Apache-2.0 | |
| Using Superpowersfarm-fe/farm | 5.6k | 35 repos | ~1.4k | Automated safety check: Pass | MIT | |
| Executing Plans Inlineobra/superpowers | 297k | 2 repos | ~5.1k | Automated safety check: Pass | MIT | |
| Skill CreatorAzure/azqr | 795 | 89 repos | ~8.2k | Automated safety check: Pass | Apache-2.0 |
Similar skills
- Official
- Official
Hook Development for Claude Code Plugins
anthropics/claude-plugins-official
Explains how to write Claude Code plugin hooks, both prompt-based checks and bash commands, for events such as PreToolUse, Stop and SessionStart.
Using Superpowers
farm-fe/farm
A skill your agent uses when starting any conversation - establishes how to find and use skills, requiring Skill tool invocation before ANY response including clarifying questions
Executing Plans Inline
obra/superpowers
Has the agent carry out an implementation plan itself, task by task in the current session, keeping a ledger, proving each step with a test and ending with one whole-branch review.
- Official
Skill Creator
Azure/azqr
Create new skills, modify and improve existing skills, and measure skill performance.
- Official
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.
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Skill Tester CI
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Revalidate persistent agent knowledge by classifying why it can become stale and how quickly it changes, then retain, revise, externalize, or retire it.
Eval Creator CI
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Related
Categories
Questions about Skill Tester
What does Skill Tester do?
Validates all interactive skills in this repo against the Agent Skills spec, project conventions, and structural requirements. Skill Tester is an agent skill from pskoett/pskoett-ai-skills. Validates all interactive skills in this repo against the Agent Skills spec, project conventions, and structural requirements.
When should I use Skill Tester?
Skill Tester fits situations like: skills have been added; modified and you want to verify everything passes before committing.
How do I install Skill Tester in Claude Code?
Run `npx skills add pskoett/pskoett-ai-skills --skill skill-tester -a claude-code`. Or copy the skill folder (skills/skill-tester in pskoett/pskoett-ai-skills) into .claude/skills/skill-tester in your project. Claude Code loads it when a task matches its description.
How do I install Skill Tester in Codex?
Run `npx skills add pskoett/pskoett-ai-skills --skill skill-tester -a codex`. Or copy the skill folder (skills/skill-tester in pskoett/pskoett-ai-skills) into .agents/skills/skill-tester in your project. Codex loads it when a task matches its description.
Can I use Skill Tester 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 pskoett/pskoett-ai-skills --skill skill-tester -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/skill-tester, .gemini/skills/skill-tester, .github/skills/skill-tester and .opencode/skills/skill-tester in your project.
What does Skill Tester need to run?
Going by SKILL.md and its folder, Skill Tester needs a shell for the scripts in its folder and the command-line tools its instructions call (python3, bash and uv). Our summary lists: Python 3; A Bash shell.
Does Skill Tester access the network?
SKILL.md contains no URLs. Its commands use uv, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Skill Tester 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Skill Tester use?
No licence was found for Skill Tester or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Skill Tester use?
About 1.3k tokens (SKILL.md is roughly 5.1k 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 Skill Tester?
Skills that share tags, products or a category with Skill Tester: MCP Server Builder (anthropics/skills, 180k stars), Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 38k stars), Using Superpowers (farm-fe/farm, 5.6k stars) and Executing Plans Inline (obra/superpowers, 297k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Skill Tester?
pskoett (a GitHub user) maintains it in pskoett/pskoett-ai-skills, which has 314 GitHub stars. The repository holds 24 skills in this directory. The repository was last updated on October 5, 2026.
Source: pskoett/pskoett-ai-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.