Web Application Testing
anthropics/skills
Tests local web applications with Python Playwright scripts, checking frontend behavior, capturing screenshots and reading browser console logs.
Register, add, or update existing custom Simulink block libraries and configure block policy and knowledge index.
Install Setup Custom Libraries
$ npx skills add matlab/simulink-agentic-toolkit --skill setup-custom-libraries -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install matlab/simulink-agentic-toolkit setup-custom-libraries --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/matlab/simulink-agentic-toolkit.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills-catalog/model-based-design-core/setup-custom-libraries .claude/skills/setup-custom-libraries && 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 "setup-custom-libraries" agent skill from https://github.com/matlab/simulink-agentic-toolkit/tree/main/skills-catalog/model-based-design-core/setup-custom-libraries into .claude/skills/setup-custom-libraries/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "setup-custom-libraries", 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/matlab/simulink-agentic-toolkit/tree/main/skills-catalog/model-based-design-core/setup-custom-librariesType 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 matlab/simulink-agentic-toolkit --skill setup-custom-libraries -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install matlab/simulink-agentic-toolkit setup-custom-libraries --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/matlab/simulink-agentic-toolkit.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills-catalog/model-based-design-core/setup-custom-libraries .agents/skills/setup-custom-libraries && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "setup-custom-libraries" agent skill from https://github.com/matlab/simulink-agentic-toolkit/tree/main/skills-catalog/model-based-design-core/setup-custom-libraries into .agents/skills/setup-custom-libraries/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "setup-custom-libraries", 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 matlab/simulink-agentic-toolkit --skill setup-custom-libraries -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install matlab/simulink-agentic-toolkit setup-custom-libraries --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/matlab/simulink-agentic-toolkit.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills-catalog/model-based-design-core/setup-custom-libraries .cursor/skills/setup-custom-libraries && 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 "setup-custom-libraries" agent skill from https://github.com/matlab/simulink-agentic-toolkit/tree/main/skills-catalog/model-based-design-core/setup-custom-libraries into .cursor/skills/setup-custom-libraries/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "setup-custom-libraries", 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/matlab/simulink-agentic-toolkit.git --path skills-catalog/model-based-design-core/setup-custom-libraries--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 matlab/simulink-agentic-toolkit --skill setup-custom-libraries -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install matlab/simulink-agentic-toolkit setup-custom-libraries --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/matlab/simulink-agentic-toolkit.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills-catalog/model-based-design-core/setup-custom-libraries .gemini/skills/setup-custom-libraries && 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 "setup-custom-libraries" agent skill from https://github.com/matlab/simulink-agentic-toolkit/tree/main/skills-catalog/model-based-design-core/setup-custom-libraries into .gemini/skills/setup-custom-libraries/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "setup-custom-libraries", 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 matlab/simulink-agentic-toolkit setup-custom-librariesInstalls 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 matlab/simulink-agentic-toolkit --skill setup-custom-libraries -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/matlab/simulink-agentic-toolkit.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills-catalog/model-based-design-core/setup-custom-libraries .github/skills/setup-custom-libraries && 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 "setup-custom-libraries" agent skill from https://github.com/matlab/simulink-agentic-toolkit/tree/main/skills-catalog/model-based-design-core/setup-custom-libraries into .github/skills/setup-custom-libraries/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "setup-custom-libraries", 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 matlab/simulink-agentic-toolkit --skill setup-custom-libraries -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install matlab/simulink-agentic-toolkit setup-custom-libraries --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/matlab/simulink-agentic-toolkit.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills-catalog/model-based-design-core/setup-custom-libraries .opencode/skills/setup-custom-libraries && 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 "setup-custom-libraries" agent skill from https://github.com/matlab/simulink-agentic-toolkit/tree/main/skills-catalog/model-based-design-core/setup-custom-libraries into .opencode/skills/setup-custom-libraries/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "setup-custom-libraries", 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
setup-custom-libraries- GitHub stars
- 1.2k
- Token cost
- ~1.5k tokens
- SKILL.md length
- 708 words
- Files
- 3 (incl. references)
- Skills in repo
- 36
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Register, add, or update existing custom Simulink block libraries and configure block policy and knowledge index.
- A user wants to register
- SKILL.md covers When to Use, When NOT to Use, Workflow and Guardrails
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Add existing .slx library files for agent-assisted model building
What it does
Setup Custom Libraries is an agent skill from matlab/simulink-agentic-toolkit. Register, add, or update existing custom Simulink block libraries and configure block policy and knowledge index. Use when a user wants to register, set up, configure, or add existing .slx library files for agent-assisted model building. Do NOT use when the user wants to create or author a new library from scratch — that requires building-simulink-models.
Its SKILL.md is about 1.5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files, including reference files (for example `manifest.yaml` and `references/library-setup.md`).
It sits in Testing & QA. The repository describes itself as: The Simulink Agentic Toolkit gives your AI agent both the tools and the expertise to work effectively with Simulink and Model-Based Design.
When your agent uses it
- A user wants to register
- Add existing .slx library files for agent-assisted model building
- The user wants to create
- Author a new library from scratch — that requires building-simulink-models
Example prompts
- “/setup-custom-libraries”
What it can do on your machine
Read from SKILL.md and the folder at commit 455dded. 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
Setup Custom Libraries loads about 1.5k tokens when it runs, and up to ~3.1k if it reads all its reference files. Until then it costs about 95 tokens; SKILL.md has 708 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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 708 words (~1,504 tokens).
“Register or update custom Simulink block libraries so the agent prefers them over built-in blocks during model building.”
- name
- setup-custom-libraries
- license
- https://www.mathworks.com/content/dam/mathworks/license/pmrl/license.md
- metadata.author
- MathWorks
- metadata.version
- 1.2
Files
SKILL.md and 2 other files (references) in skills-catalog/model-based-design-core/setup-custom-libraries of matlab/simulink-agentic-toolkit.
- SKILL.md
- manifest.yaml
- references/library-setup.md
Open the folder on GitHubat commit 455dded
Compare with similar skills
Setup Custom Libraries 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 |
|---|---|---|---|---|---|---|
| Setup Custom Libraries this skillmatlab/simulink-agentic-toolkit | 1.2k | — | ~1.5k | Automated safety check: Pass | Custom licence | |
| Web Application Testinganthropics/skills | 180k | 51 repos | ~966 | Automated safety check: Pass | Apache-2.0 | |
| Diagnosing Bugsfossasia/eventyay-interpretation | 1.6k | 31 repos | ~2.1k | Automated safety check: Pass | Apache-2.0 | |
| TDDfossasia/eventyay-interpretation | 1.6k | 28 repos | ~1.1k | Automated safety check: Pass | Apache-2.0 | |
| TDD WorkflowhellangleZ/burn-in-cceverywhere-ralph | 112 | 11 repos | ~2.4k | Automated safety check: Pass | None | |
| TDDsanity-io/sanity | 6.4k | 20 repos | ~1k | Automated safety check: Pass | MIT |
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- Official
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TDD
fossasia/eventyay-interpretation
Test-driven development. An agent skill from fossasia/eventyay-interpretation.
TDD Workflow
hellangleZ/burn-in-cceverywhere-ralph
A skill your agent uses when writing new features, fixing bugs, or refactoring code.
- Official
TDD
sanity-io/sanity
Test-driven development with red-green-refactor loop. An agent skill from sanity-io/sanity.
Context Driven Development
Ibrahim-3d/orchestrator-supaconductor
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Related
Categories
Questions about Setup Custom Libraries
What does Setup Custom Libraries do?
Register, add, or update existing custom Simulink block libraries and configure block policy and knowledge index. Setup Custom Libraries is an agent skill from matlab/simulink-agentic-toolkit. Register, add, or update existing custom Simulink block libraries and configure block policy and knowledge index.
When should I use Setup Custom Libraries?
Setup Custom Libraries fits situations like: A user wants to register; add existing .slx library files for agent-assisted model building; the user wants to create; author a new library from scratch — that requires building-simulink-models.
How do I install Setup Custom Libraries in Claude Code?
Run `npx skills add matlab/simulink-agentic-toolkit --skill setup-custom-libraries -a claude-code`. Or copy the skill folder (skills-catalog/model-based-design-core/setup-custom-libraries in matlab/simulink-agentic-toolkit) into .claude/skills/setup-custom-libraries in your project. Claude Code loads it when a task matches its description.
How do I install Setup Custom Libraries in Codex?
Run `npx skills add matlab/simulink-agentic-toolkit --skill setup-custom-libraries -a codex`. Or copy the skill folder (skills-catalog/model-based-design-core/setup-custom-libraries in matlab/simulink-agentic-toolkit) into .agents/skills/setup-custom-libraries in your project. Codex loads it when a task matches its description.
Can I use Setup Custom Libraries 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 matlab/simulink-agentic-toolkit --skill setup-custom-libraries -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/setup-custom-libraries, .gemini/skills/setup-custom-libraries, .github/skills/setup-custom-libraries and .opencode/skills/setup-custom-libraries in your project.
What does Setup Custom Libraries need to run?
SKILL.md names no scripts, command-line tools or credentials: Setup Custom Libraries is instructions for the agent only.
Does Setup Custom Libraries 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 Setup Custom Libraries 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 Setup Custom Libraries use?
Setup Custom Libraries has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Setup Custom Libraries use?
About 1.5k tokens (SKILL.md is roughly 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 1.6k tokens, read only when the agent opens those files.
What are the alternatives to Setup Custom Libraries?
Skills that share tags, products or a category with Setup Custom Libraries: Web Application Testing (anthropics/skills, 180k stars), Diagnosing Bugs (fossasia/eventyay-interpretation, 1.6k stars), TDD (fossasia/eventyay-interpretation, 1.6k stars) and TDD Workflow (hellangleZ/burn-in-cceverywhere-ralph, 112 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Setup Custom Libraries?
matlab (a GitHub organization) maintains it in matlab/simulink-agentic-toolkit, which has 1,195 GitHub stars. The repository holds 36 skills in this directory. The repository was last updated on September 30, 2026.
Source: matlab/simulink-agentic-toolkit on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.