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.
Validate and score Claude Code skill packages for quality, completeness, and best-practice compliance.
MITAuto-check passed
Install Skill Tester
$ npx skills add borghei/Claude-Skills --skill skill-tester -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install borghei/Claude-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/borghei/Claude-Skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/engineering/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/borghei/Claude-Skills/tree/main/engineering/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/borghei/Claude-Skills/tree/main/engineering/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 borghei/Claude-Skills --skill skill-tester -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install borghei/Claude-Skills skill-tester --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/borghei/Claude-Skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/engineering/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/borghei/Claude-Skills/tree/main/engineering/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 borghei/Claude-Skills --skill skill-tester -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install borghei/Claude-Skills skill-tester --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/borghei/Claude-Skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/engineering/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/borghei/Claude-Skills/tree/main/engineering/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/borghei/Claude-Skills.git --path engineering/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 borghei/Claude-Skills --skill skill-tester -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install borghei/Claude-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/borghei/Claude-Skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/engineering/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/borghei/Claude-Skills/tree/main/engineering/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 borghei/Claude-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 borghei/Claude-Skills --skill skill-tester -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/borghei/Claude-Skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/engineering/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/borghei/Claude-Skills/tree/main/engineering/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 borghei/Claude-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 borghei/Claude-Skills skill-tester --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/borghei/Claude-Skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/engineering/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/borghei/Claude-Skills/tree/main/engineering/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
- 881
- Token cost
- ~1.8k tokens
- SKILL.md length
- 677 words
- Files
- 12 (incl. scripts, references)
- Skills in repo
- 349
- Repo updated
- First seen
- Licence
- MIT
At a glance
Validate and score Claude Code skill packages for quality, completeness, and best-practice compliance.
- Auditing skill packages
- SKILL.md covers Core Capabilities, When to Use, Clarify First and Quick Start, plus 4 more sections
- Runs Python scripts from its folder; calls python
What it does
Skill Tester is an agent skill from borghei/Claude-Skills. Validate and score Claude Code skill packages for quality, completeness, and best-practice compliance. Tests Python scripts, checks YAML frontmatter, and generates reports. Use when creating, validating, or auditing skill packages.
Its SKILL.md is about 1.8k tokens, which your agent loads only when the skill is triggered. The skill folder holds 14 other files, including scripts and reference files (for example `README.md`, `expected_outputs/sample_validation_report.json` and `references/quality-scoring-rubric.md`).
It works with Python. The repository describes itself as: 385 AI skills, 77 expert agents, and 900 stdlib Python tools for every team: engineering, PM, marketing, C-level, compliance, business ops, research, and a LinkedIn toolkit… The licence is MIT.
When your agent uses it
- Auditing skill packages
Example prompts
- “/skill-tester”
Requirements
- Python 3
What it can do on your machine
Read from SKILL.md and the folder at commit 4a698e8. 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 3 files in scripts/ (Python), which the agent can run.
Shell commands in SKILL.md call:
python
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
Skill Tester loads about 1.8k tokens when it runs, and up to ~15k if it reads all its reference files. Until then it costs about 61 tokens; SKILL.md has 677 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
The full file from borghei/Claude-Skills at commit 4a698e8, republished under its MIT licence (© borghei). 677 words, ~1,758 tokens.
Download SKILL.mdSave it as
.claude/skills/skill-tester/SKILL.md (or your agent's skills folder). This skill also uses 11 other files; get the full folder from GitHub.- name
- skill-tester
- description
- Validate and score Claude Code skill packages for quality, completeness, and best-practice compliance. Tests Python scripts, checks YAML frontmatter, and generates reports. Use when creating, validating, or auditing skill packages.
- license
- MIT + Commons Clause
- metadata.version
- 1.1.0
- metadata.author
- borghei
- metadata.category
- engineering
- metadata.domain
- meta-skills
- metadata.tier
- POWERFUL
- metadata.updated
- 2026-06-17
Skill Tester
Validate skill packages for structure compliance, test Python scripts for syntax and stdlib-only imports, and score quality across four dimensions (documentation, code quality, completeness, usability) with letter grades and improvement recommendations. Supports BASIC, STANDARD, and POWERFUL tier classification.
Core Capabilities
- Structure validation — check required files, directory layout, YAML frontmatter, and required SKILL.md sections against tier thresholds.
- Script testing — AST syntax checks, stdlib-only import analysis, argparse and
__main__-guard detection, runtime--helpand sample-data execution. - Quality scoring — four equally weighted dimensions producing an overall score, letter grade (A+ through F), and a prioritized improvement roadmap.
- Tier classification — BASIC / STANDARD / POWERFUL requirements for SKILL.md depth, script count/LOC, argparse, output formats, and error handling.
- Dual output — human-readable reports and
--jsonfor CI/CD gating with meaningful exit codes.
When to Use
- Creating a new skill and validating it before publishing.
- Auditing an existing skill's structure, scripts, and quality.
- Embedding a quality gate into a CI/CD pipeline.
Clarify First
Before validating, confirm these inputs. If any is unknown or vague, ASK — do not assume:
- Target skill path — the skill directory to validate, test, and score (the subject of all three tools)
- Target tier — BASIC / STANDARD / POWERFUL (
--tier; sets the required sections, script count, and structural thresholds) - Pass bar — the minimum quality score / whether failures gate CI (
--minimum-score, exit codes)
Stop rule: ask only the 2-3 that most change the output. If the user says "just draft it," proceed and list your assumptions at the top of the artifact.
Quick Start
# Validate skill structure and documentation
python skill_validator.py engineering/my-skill --tier POWERFUL --json
# Test all Python scripts in a skill
python script_tester.py engineering/my-skill --timeout 30
# Score quality with improvement roadmap
python quality_scorer.py engineering/my-skill --detailed --minimum-score 75Tools
| Tool | Purpose | Command |
|---|---|---|
skill_validator.py | Validate structure, frontmatter, required sections, and scripts against tier rules | python scripts/skill_validator.py engineering/my-skill --tier POWERFUL --json |
script_tester.py | Static + runtime tests of scripts (syntax, imports, argparse, --help, samples) | python scripts/script_tester.py engineering/my-skill --timeout 60 --json |
quality_scorer.py | Score four quality dimensions with letter grade and improvement roadmap | python scripts/quality_scorer.py engineering/my-skill --detailed --minimum-score 75 --json |
See references/tool-reference.md for full parameter tables, output formats, and exit codes.
References
Load the reference that matches the task — keep this file lean and pull detail on demand:
- references/workflows-and-cicd.md — the three core validation workflows, the tier-requirements and quality-scoring tables, CI/CD integration, anti-patterns, troubleshooting, and success criteria. Read when running a validation pass or wiring a CI gate.
- references/tool-reference.md — full parameter tables, output formats, and exit codes for the three Python tools. Read when scripting the tools or interpreting JSON output.
- references/skill-structure-specification.md — the authoritative specification for skill directory structure, required files, and frontmatter. Read when defining what "valid structure" means.
- references/tier-requirements-matrix.md — the full BASIC/STANDARD/POWERFUL requirements matrix with detailed criteria per tier. Read when classifying or upgrading a skill's tier.
- references/quality-scoring-rubric.md — the detailed scoring rubric with per-component weights and grading bands. Read when interpreting or tuning quality scores.
Show full SKILL.md (239 more words)Show less
Scope & Limitations
Covers:
- Structural validation of skill directories against tier-specific requirements (BASIC, STANDARD, POWERFUL)
- Static analysis of Python scripts including syntax checking, import validation, argparse detection, and main guard verification
- Multi-dimensional quality scoring across documentation, code quality, completeness, and usability
- Dual output formatting (JSON for CI/CD pipelines, human-readable for developer consumption)
Does NOT cover:
- Functional correctness of script logic or algorithm accuracy — the tester verifies structure and conventions, not business logic
- Performance benchmarking or memory profiling of scripts — see
engineering/performance-profilerfor runtime analysis - Security vulnerability scanning of script code — see
engineering/skill-security-auditorfor dependency and code security audits - Cross-skill dependency resolution or integration testing — skills are validated in isolation without verifying inter-skill compatibility
Integration Points
| Skill | Integration | Data Flow |
|---|---|---|
engineering/skill-security-auditor | Run security audit after validation passes | skill_validator.py confirms structure compliance, then skill-security-auditor scans for vulnerabilities in the same skill path |
engineering/ci-cd-pipeline-builder | Embed skill-tester as a quality gate stage | Pipeline builder generates workflow YAML that invokes skill_validator.py, script_tester.py, and quality_scorer.py sequentially |
engineering/changelog-generator | Feed quality score deltas into changelog entries | Compare quality_scorer.py JSON output between releases to surface quality improvements or regressions |
engineering/pr-review-expert | Attach validation report to pull request reviews | skill_validator.py --json output is posted as a PR comment for reviewer context |
engineering/performance-profiler | Complement structural testing with runtime profiling | After script_tester.py confirms execution succeeds, performance-profiler measures execution time and resource usage |
engineering/tech-debt-tracker | Track quality score trends over time | Periodic quality_scorer.py --json output is ingested to detect score degradation and flag technical debt |
© borghei, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 11 other files (scripts, references) in engineering/skill-tester of borghei/Claude-Skills.
- SKILL.md
- README.md
- assets
- expected_outputs/sample_validation_report.json
- references/quality-scoring-rubric.md
- references/skill-structure-specification.md
- references/tier-requirements-matrix.md
- references/tool-reference.md
- references/workflows-and-cicd.md
- scripts/quality_scorer.py
- scripts/script_tester.py
- scripts/skill_validator.py
Open the folder on GitHubat commit 4a698e8
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 skillborghei/Claude-Skills | 881 | — | ~1.8k | Automated safety check: Pass | MIT | |
| MCP Server Builderanthropics/skills | 180k | 64 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| PDF Processinganthropics/skills | 180k | 48 repos | ~2k | Automated safety check: Pass | Proprietary | |
| NotebookLM Research AssistantPleasePrompto/notebooklm-skill | 7.8k | 14 repos | ~2.4k | Automated safety check: Notes | MIT | |
| Manim Video Productionbrowser-use/video-use | 28k | 6 repos | ~3k | Automated safety check: Pass | MIT | |
| Code Review ChecklistshareAI-lab/learn-claude-code | 78k | 5 repos | ~1.1k | Automated safety check: Pass | MIT |
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Questions about Skill Tester
What does Skill Tester do?
Validate and score Claude Code skill packages for quality, completeness, and best-practice compliance. Skill Tester is an agent skill from borghei/Claude-Skills. Validate and score Claude Code skill packages for quality, completeness, and best-practice compliance.
When should I use Skill Tester?
Skill Tester fits situations like: auditing skill packages.
How do I install Skill Tester in Claude Code?
Run `npx skills add borghei/Claude-Skills --skill skill-tester -a claude-code`. Or copy the skill folder (engineering/skill-tester in borghei/Claude-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 borghei/Claude-Skills --skill skill-tester -a codex`. Or copy the skill folder (engineering/skill-tester in borghei/Claude-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 borghei/Claude-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 Python for the scripts in its folder and the command-line tools its instructions call (python). Our summary lists: Python 3.
Does Skill Tester 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 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?
Skill Tester is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Skill Tester use?
About 1.8k tokens (SKILL.md is roughly 7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 14k tokens, read only when the agent opens those files.
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), PDF Processing (anthropics/skills, 180k stars), NotebookLM Research Assistant (PleasePrompto/notebooklm-skill, 7.8k stars) and Manim Video Production (browser-use/video-use, 28k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Skill Tester?
borghei (a GitHub user) maintains it in borghei/Claude-Skills, which has 881 GitHub stars. The repository holds 349 skills in this directory. The repository was last updated on October 7, 2026.
Source: borghei/Claude-Skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.