Agent skill

Typescript Testing

by ComposioHQ in ComposioHQ/composio

Select and run TypeScript SDK verification for packages, examples, type checks, linting, builds, Vitest suites, Effect v4 CLI tests, and runtime E2E tests.

MITAuto-check passedTesting & QA

Install Typescript Testing

skills CLI
$ npx skills add ComposioHQ/composio --skill typescript-testing -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install ComposioHQ/composio typescript-testing --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/ComposioHQ/composio.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/typescript-testing .claude/skills/typescript-testing && rm -rf skills-src

Use ~/.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/

Facts

Skill name
typescript-testing
GitHub stars
30k
Token cost
~222 tokens
SKILL.md length
49 words
Files
3 (incl. references)
Skills in repo
7
Repo updated
First seen
Licence
MIT

At a glance

Select and run TypeScript SDK verification for packages, examples, type checks, linting, builds, Vitest suites, Effect v4 CLI tests, and runtime E2E tests.

  • Diagnosing TypeScript CI
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Choosing a focused test command
  • Validating TypeScript package changes

What it does

Typescript Testing is an agent skill from ComposioHQ/composio. Select and run TypeScript SDK verification for packages, examples, type checks, linting, builds, Vitest suites, Effect v4 CLI tests, and runtime E2E tests. Use when adding tests, diagnosing TypeScript CI, choosing a focused test command, validating TypeScript package changes, or writing/porting CLI tests against effect@4.0.0-rc.117 and @effect/vitest. Do not use for Python-only checks.

Its SKILL.md is about 220 tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files, including reference files (for example `references/effect-v4-cli.md` and `references/test-commands.md`).

It sits in Testing & QA, covering Unit testing, Linting and formatting and End-to-end testing. It works with TypeScript, Python, Vitest and Model Context Protocol. The repository describes itself as: Composio powers 1000+ toolkits, tool search, context management, authentication, and a sandboxed workbench to help you build AI agents that turn intent into action. The licence is MIT.

When your agent uses it

  • Diagnosing TypeScript CI
  • Choosing a focused test command
  • Validating TypeScript package changes
  • Writing/porting CLI tests against effect@4.0.0-rc.117 and @effect/vitest

Example prompts

  • “/typescript-testing”

What it can do on your machine

Read from SKILL.md and the folder at commit 900bbb3. 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

Typescript Testing loads about 222 tokens when it runs, and up to ~2.3k if it reads all its reference files. Until then it costs about 102 tokens; SKILL.md has 49 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~102
When it runs · the whole SKILL.md, loaded when a task matches
~222
With references · SKILL.md plus every file in references/, read only if the agent opens them
~2.3k

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

The full file from ComposioHQ/composio at commit 900bbb3, republished under its MIT licence (© ComposioHQ). 49 words, ~222 tokens.

Download SKILL.mdSave it as .claude/skills/typescript-testing/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.
name
typescript-testing
description
Select and run TypeScript SDK verification for packages, examples, type checks, linting, builds, Vitest suites, Effect v4 CLI tests, and runtime E2E tests. Use when adding tests, diagnosing TypeScript CI, choosing a focused test command, validating TypeScript package changes, or writing/porting CLI tests against effect@4.0.0-rc.117 and @effect/vitest. Do not use for Python-only checks.

TypeScript Testing

Use this skill to choose verification for TypeScript changes.

Read references/test-commands.md before running broad checks or adding new test coverage.

Read references/effect-v4-cli.md before writing or modifying tests under ts/packages/cli/test/ — it covers it.effect/layer(...) conventions, explicit per-service test layers (no .Default auto-generation in v4), and the @effect/platform-bun subpath-import rule.

© ComposioHQ, 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 2 other files (references) in .agents/skills/typescript-testing of ComposioHQ/composio.

  • SKILL.md
  • references/effect-v4-cli.md
  • references/test-commands.md

Open the folder on GitHubat commit 900bbb3

Compare with similar skills

Typescript Testing 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.

Typescript Testing compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Typescript Testing this skillComposioHQ/composio30k—~222Automated safety check: PassMIT
Ha Frontend Testinghome-assistant/frontend5.7k—~1.7kAutomated safety check: PassApache-2.0
Zizkadb TestZIZKA-AI-SL/ZizkaDB124—~358Automated safety check: PassCustom licence
Testing Patternssoftspark/ai-toolkit179—~1.6kAutomated safety check: PassApache-2.0
Svelte Testingspences10/sveltest113—~579Automated safety check: PassMIT
Playwright Testingchongdashu/vibejam-starter-pack149—~2.2kAutomated safety check: PassNone

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Categories

Questions about Typescript Testing

What does Typescript Testing do?

Select and run TypeScript SDK verification for packages, examples, type checks, linting, builds, Vitest suites, Effect v4 CLI tests, and runtime E2E tests. Typescript Testing is an agent skill from ComposioHQ/composio. Select and run TypeScript SDK verification for packages, examples, type checks, linting, builds, Vitest suites, Effect v4 CLI tests, and runtime E2E tests.

When should I use Typescript Testing?

Typescript Testing fits situations like: diagnosing TypeScript CI; choosing a focused test command; validating TypeScript package changes; writing/porting CLI tests against effect@4.0.0-rc.117 and @effect/vitest.

How do I install Typescript Testing in Claude Code?

Run `npx skills add ComposioHQ/composio --skill typescript-testing -a claude-code`. Or copy the skill folder (.agents/skills/typescript-testing in ComposioHQ/composio) into .claude/skills/typescript-testing in your project. Claude Code loads it when a task matches its description.

How do I install Typescript Testing in Codex?

Run `npx skills add ComposioHQ/composio --skill typescript-testing -a codex`. Or copy the skill folder (.agents/skills/typescript-testing in ComposioHQ/composio) into .agents/skills/typescript-testing in your project. Codex loads it when a task matches its description.

Can I use Typescript Testing 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 ComposioHQ/composio --skill typescript-testing -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/typescript-testing, .gemini/skills/typescript-testing, .github/skills/typescript-testing and .opencode/skills/typescript-testing in your project.

What does Typescript Testing need to run?

SKILL.md names no scripts, command-line tools or credentials: Typescript Testing is instructions for the agent only.

Does Typescript Testing 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 Typescript Testing 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 Typescript Testing use?

Typescript Testing is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Typescript Testing use?

About 222 tokens (SKILL.md is roughly 888 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 2.1k tokens, read only when the agent opens those files.

What are the alternatives to Typescript Testing?

Skills that share tags, products or a category with Typescript Testing: Ha Frontend Testing (home-assistant/frontend, 5.7k stars), Zizkadb Test (ZIZKA-AI-SL/ZizkaDB, 124 stars), Testing Patterns (softspark/ai-toolkit, 179 stars) and Svelte Testing (spences10/sveltest, 113 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Typescript Testing?

ComposioHQ (a GitHub organization) maintains it in ComposioHQ/composio, which has 30,455 GitHub stars. The repository holds 7 skills in this directory. The repository was last updated on October 7, 2026.

Source: ComposioHQ/composio on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.