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.
Use this sub-skill for maintainer-facing Ultralytics repository edits, editable installs, focused tests, docs/style checks, optional extras, CI-aware validation, and safe native verification planning.
AGPL-3.0Auto-check passed
Install Repo Development
$ npx skills add VectorSpaceLab/AREX-Skill --skill repo-development -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install VectorSpaceLab/AREX-Skill repo-development --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/VectorSpaceLab/AREX-Skill.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/repositories/repo-skills/ultralytics/sub-skills/repo-development .claude/skills/repo-development && 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 "repo-development" agent skill from https://github.com/VectorSpaceLab/AREX-Skill/tree/main/skills/repositories/repo-skills/ultralytics/sub-skills/repo-development into .claude/skills/repo-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "repo-development", 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/VectorSpaceLab/AREX-Skill/tree/main/skills/repositories/repo-skills/ultralytics/sub-skills/repo-developmentType 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 VectorSpaceLab/AREX-Skill --skill repo-development -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install VectorSpaceLab/AREX-Skill repo-development --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/VectorSpaceLab/AREX-Skill.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/repositories/repo-skills/ultralytics/sub-skills/repo-development .agents/skills/repo-development && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "repo-development" agent skill from https://github.com/VectorSpaceLab/AREX-Skill/tree/main/skills/repositories/repo-skills/ultralytics/sub-skills/repo-development into .agents/skills/repo-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "repo-development", 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 VectorSpaceLab/AREX-Skill --skill repo-development -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install VectorSpaceLab/AREX-Skill repo-development --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/VectorSpaceLab/AREX-Skill.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/repositories/repo-skills/ultralytics/sub-skills/repo-development .cursor/skills/repo-development && 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 "repo-development" agent skill from https://github.com/VectorSpaceLab/AREX-Skill/tree/main/skills/repositories/repo-skills/ultralytics/sub-skills/repo-development into .cursor/skills/repo-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "repo-development", 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/VectorSpaceLab/AREX-Skill.git --path skills/repositories/repo-skills/ultralytics/sub-skills/repo-development--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 VectorSpaceLab/AREX-Skill --skill repo-development -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install VectorSpaceLab/AREX-Skill repo-development --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/VectorSpaceLab/AREX-Skill.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/repositories/repo-skills/ultralytics/sub-skills/repo-development .gemini/skills/repo-development && 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 "repo-development" agent skill from https://github.com/VectorSpaceLab/AREX-Skill/tree/main/skills/repositories/repo-skills/ultralytics/sub-skills/repo-development into .gemini/skills/repo-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "repo-development", 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 VectorSpaceLab/AREX-Skill repo-developmentInstalls 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 VectorSpaceLab/AREX-Skill --skill repo-development -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/VectorSpaceLab/AREX-Skill.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/repositories/repo-skills/ultralytics/sub-skills/repo-development .github/skills/repo-development && 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 "repo-development" agent skill from https://github.com/VectorSpaceLab/AREX-Skill/tree/main/skills/repositories/repo-skills/ultralytics/sub-skills/repo-development into .github/skills/repo-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "repo-development", 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 VectorSpaceLab/AREX-Skill --skill repo-development -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install VectorSpaceLab/AREX-Skill repo-development --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/VectorSpaceLab/AREX-Skill.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/repositories/repo-skills/ultralytics/sub-skills/repo-development .opencode/skills/repo-development && 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 "repo-development" agent skill from https://github.com/VectorSpaceLab/AREX-Skill/tree/main/skills/repositories/repo-skills/ultralytics/sub-skills/repo-development into .opencode/skills/repo-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "repo-development", 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
repo-development- GitHub stars
- 331
- Token cost
- ~1.1k tokens
- SKILL.md length
- 421 words
- Files
- 6 (incl. scripts, references)
- Skills in repo
- 157
- Repo updated
- First seen
- Licence
- AGPL-3.0
At a glance
Use this sub-skill for maintainer-facing Ultralytics repository edits, editable installs, focused tests, docs/style checks, optional extras, CI-aware validation, and safe native verification planning.
- Works in 6 steps: Confirm the checkout can import the… → Classify changed paths before testing:… → Start with no-download checks (yolo… → …
- SKILL.md covers Route Elsewhere, Fast Path, Common Commands and Safe Native Test Selection, plus 1 more section
- Runs Python scripts from its folder; calls python, pytest and ruff
What it does
Repo Development is an agent skill from VectorSpaceLab/AREX-Skill. Use this sub-skill for maintainer-facing Ultralytics repository edits, editable installs, focused tests, docs/style checks, optional extras, CI-aware validation, and safe native verification planning.
Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 7 other files, including scripts and reference files (for example `references/api-reference.md`, `references/troubleshooting.md` and `references/workflows.md`).
It works with Python. The repository describes itself as: A Skill Library for Automated Machine Learning. The licence is AGPL-3.0.
Example prompts
- “/repo-development”
Requirements
- Python 3
Workflow steps
6 steps, taken from the first numbered list in SKILL.md.
- Confirm the checkout can import the editable package: python -m pip install -e ".[dev]" in a prepared development environment, then python…
- Classify changed paths before testing: python sub-skills/repo-development/scripts/select_tests.py ....
- Start with no-download checks (yolo --help, yolo version, yolo cfg, exact pytest nodes) before broad tests.
- Add or update tests in the closest existing tests/test_*.py file unless the change introduces a new broad test category.
- Use project-configured tools from pyproject.toml; do not invent a new formatter, linter, docs builder, or dependency policy.
- Escalate from focused tests to full CI-like runs only when assets, optional extras, hardware, and network/cache policy are explicit.
What it can do on your machine
Read from SKILL.md and the folder at commit ac3fe1a. 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 2 files in scripts/ (Python), which the agent can run.
Shell commands in SKILL.md call:
pythonpytestruff
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
Repo Development loads about 1.1k tokens when it runs, and up to ~3.7k if it reads all its reference files. Until then it costs about 54 tokens; SKILL.md has 421 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 VectorSpaceLab/AREX-Skill at commit ac3fe1a, republished under its AGPL-3.0 licence (© VectorSpaceLab). 421 words, ~1,148 tokens.
Download SKILL.mdSave it as
.claude/skills/repo-development/SKILL.md (or your agent's skills folder). This skill also uses 5 other files; get the full folder from GitHub.- name
- repo-development
- description
- Use this sub-skill for maintainer-facing Ultralytics repository edits, editable installs, focused tests, docs/style checks, optional extras, CI-aware validation, and safe native verification planning.
- disable-model-invocation
- true
- metadata.disco-role
- operating
- license
- AGPL 3.0
Repo Development
Use this sub-skill when working inside the Ultralytics repository itself: editable setup, source edits, tests, docs/config updates, style tooling, optional development extras, CI-local parity, or safe native test selection.
Route Elsewhere
- Dataset YAML authoring, config semantics, data paths, and augmentation configuration:
../data-and-configuration/SKILL.md - Training/validation commands, metrics, resume, devices, and dataset runtime behavior:
../training-and-validation/SKILL.md - Prediction,
Resultsobject usage, plotting, postprocessing, and CLI/Python inference:../inference-and-results/SKILL.md - Export formats, deployment runtimes, benchmark mode, and backend installation:
../export-and-deployment/SKILL.md - Tracking mode and solution app operation:
../tracking-and-solutions/SKILL.md - Model family/task selection and architecture-level user guidance:
../model-families-and-tasks/SKILL.md
Stay here when the user is editing repo code, tests, docs, packaging, CI, or maintainer tooling even if the touched subsystem is owned by another user-facing sub-skill.
Fast Path
- Confirm the checkout can import the editable package:
python -m pip install -e ".[dev]"in a prepared development environment, thenpython -c "import ultralytics; print(ultralytics.__version__)". - Classify changed paths before testing:
python sub-skills/repo-development/scripts/select_tests.py <changed-path> .... - Start with no-download checks (
yolo --help,yolo version,yolo cfg, exact pytest nodes) before broad tests. - Add or update tests in the closest existing
tests/test_*.pyfile unless the change introduces a new broad test category. - Use project-configured tools from
pyproject.toml; do not invent a new formatter, linter, docs builder, or dependency policy. - Escalate from focused tests to full CI-like runs only when assets, optional extras, hardware, and network/cache policy are explicit.
Common Commands
Editable maintainer setup:
python -m pip install -e ".[dev]"
python -c "import ultralytics; print(ultralytics.__version__)"
yolo --help
yolo cfgFocused planner examples:
python sub-skills/repo-development/scripts/select_tests.py ultralytics/engine/results.py
python sub-skills/repo-development/scripts/select_tests.py --json docs/en/help/contributing.md mkdocs.ymlCheap focused checks after parser/config changes:
pytest tests/test_cli.py::test_special_modes
pytest tests/test_python.py::test_cfg_init
yolo --help
yolo version
yolo cfgDocs-only change planning should prefer markdown/style/reference checks and skip ML tests unless docs examples changed runtime code:
ruff check docs/en/help/contributing.md
python docs/build_reference.py
python docs/build_docs.pyTreat docs build scripts as environment-gated because they require docs/dev dependencies and may update generated files.
Show full SKILL.md (146 more words)Show less
Safe Native Test Selection
ultralytics/engine/results.pychanges should start with exact or file-level engine/API tests plus a directResultssmoke if needed; do not run export matrices unless exporter/backend code changed.docs/,README.md, andmkdocs.ymlchanges should route to markdown, Ruff, docs reference, and MkDocs checks; skip ML tests by default.tests/changes should run the changed test node/file first, then the adjacent subsystem only if the test exercises changed behavior.ultralytics/cfg/default.yamland CLI parser changes should combinetests/test_cli.py::test_special_modes,tests/test_python.py::test_cfg_init, andyolo cfg.- Export, CUDA, solutions, and integration tests are not default smoke checks; they require matching extras, hardware, cached assets, or explicit download permission.
References
- Maintainer setup, style/config, optional extras, docs, CI, and PR guidance:
references/workflows.md - Changed-path test planner behavior and examples:
references/api-reference.md - Failure diagnosis for installs, CLI syntax, configs, downloads, devices, docs, and optional extras:
references/troubleshooting.md - Deterministic focused-test planner:
scripts/select_tests.py - Optional environment inspection helper:
scripts/check_ultralytics_env.py
© VectorSpaceLab, AGPL-3.0. 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 5 other files (scripts, references) in skills/repositories/repo-skills/ultralytics/sub-skills/repo-development of VectorSpaceLab/AREX-Skill.
- SKILL.md
- references/api-reference.md
- references/troubleshooting.md
- references/workflows.md
- scripts/check_ultralytics_env.py
- scripts/select_tests.py
Open the folder on GitHubat commit ac3fe1a
Compare with similar skills
Repo Development 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 |
|---|---|---|---|---|---|---|
| Repo Development this skillVectorSpaceLab/AREX-Skill | 331 | — | ~1.1k | Automated safety check: Pass | AGPL-3.0 | |
| MCP Server Builderanthropics/skills | 180k | 63 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| PDF Processinganthropics/skills | 180k | 47 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 | 29k | 6 repos | ~3k | Automated safety check: Pass | MIT | |
| PPT Masterhugohe3/ppt-master | 59k | 1 repos | ~2.5k | Automated safety check: Pass | MIT |
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Related
Works with
Questions about Repo Development
What does Repo Development do?
Use this sub-skill for maintainer-facing Ultralytics repository edits, editable installs, focused tests, docs/style checks, optional extras, CI-aware validation, and safe native verification planning. Repo Development is an agent skill from VectorSpaceLab/AREX-Skill. Use this sub-skill for maintainer-facing Ultralytics repository edits, editable installs, focused tests, docs/style checks, optional extras, CI-aware validation, and safe native verification planning.
How do I install Repo Development in Claude Code?
Run `npx skills add VectorSpaceLab/AREX-Skill --skill repo-development -a claude-code`. Or copy the skill folder (skills/repositories/repo-skills/ultralytics/sub-skills/repo-development in VectorSpaceLab/AREX-Skill) into .claude/skills/repo-development in your project. Claude Code loads it when a task matches its description.
How do I install Repo Development in Codex?
Run `npx skills add VectorSpaceLab/AREX-Skill --skill repo-development -a codex`. Or copy the skill folder (skills/repositories/repo-skills/ultralytics/sub-skills/repo-development in VectorSpaceLab/AREX-Skill) into .agents/skills/repo-development in your project. Codex loads it when a task matches its description.
Can I use Repo Development 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 VectorSpaceLab/AREX-Skill --skill repo-development -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/repo-development, .gemini/skills/repo-development, .github/skills/repo-development and .opencode/skills/repo-development in your project.
What does Repo Development need to run?
Going by SKILL.md and its folder, Repo Development needs Python for the scripts in its folder and the command-line tools its instructions call (python, pytest and ruff). Our summary lists: Python 3.
Does Repo Development 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 Repo Development 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 Repo Development use?
Repo Development is published under the AGPL-3.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Repo Development use?
About 1.1k tokens (SKILL.md is roughly 4.6k 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 2.6k tokens, read only when the agent opens those files.
What are the alternatives to Repo Development?
Skills that share tags, products or a category with Repo Development: 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, 29k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Repo Development?
VectorSpaceLab (a GitHub organization) maintains it in VectorSpaceLab/AREX-Skill, which has 331 GitHub stars. The repository holds 157 skills in this directory. The repository was last updated on September 3, 2026.
Source: VectorSpaceLab/AREX-Skill on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.