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Agent skill

Supercov

by supercorp-ai in supercorp-ai/supercov

Measures test coverage and code quality in a repository with the supercov CLI, and turns what it finds into small, focused tests or fixes.

MITAuto-check passedTesting & QA

Install Supercov

skills CLI
$ npx skills add supercorp-ai/supercov --skill supercov -a claude-code

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

GitHub CLI
$ gh skill install supercorp-ai/supercov supercov --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/supercorp-ai/supercov.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/supercov/skills/supercov .claude/skills/supercov && 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
supercov
GitHub stars
152
Used in
1 other repo
Token cost
~415 tokens
SKILL.md length
202 words
Files
1
Skills in repo
2
Repo updated
First seen
Licence
MIT

At a glance

Measures test coverage and code quality in a repository with the supercov CLI, and turns what it finds into small, focused tests or fixes.

  • Works in 4 steps: Measure the full suite: npx supercov --… → List targets with npx supercov runs… → Write one focused test. Change only… → …
  • The user asks to add
  • SKILL.md covers Add a test and Quality
  • Calls npx; needs TYPESAFE_API_KEY

What it does

Supercov is an agent skill from supercorp-ai/supercov. Measures test coverage and code quality in a repository with the supercov CLI, and turns what it finds into small, focused tests or fixes. Use when the user asks to add or improve tests, find untested code or raise coverage, or find what to refactor. Works with JavaScript, TypeScript, Python, Ruby, Rust, Go, Java and Kotlin projects.

Its SKILL.md is about 420 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Testing & QA, covering Test coverage, Code quality and Android development. It works with JavaScript, Python, Ruby and Rust. The repository describes itself as: Coverage, security and code quality for coding agents. The licence is MIT.

When your agent uses it

  • The user asks to add
  • Find untested code
  • Find what to refactor

Example prompts

  • “Use the supercov skill to measure test coverage and code quality in a repository with the supercov CLI, and turns what it finds into small, focused…”
  • “/supercov”

Requirements

  • Node.js
  • A credential in TYPESAFE_API_KEY

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. Measure the full suite: npx supercov -- , for example npx supercov -- npm test.
  2. List targets with npx supercov runs latest gaps --limit 5, pick one, and inspect it with npx supercov runs latest file .
  3. Write one focused test. Change only tests unless the user asks otherwise.
  4. Rerun the same command and report the test and the coverage before and after.

What it can do on your machine

Read from SKILL.md and the folder at commit d337a58. 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

    Shell commands in SKILL.md call:

    • npx

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Links to these hosts (documentation or services it may open):

    • supercov.com

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names these keys or tokens, usually read from environment variables:

    • TYPESAFE_API_KEY

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Supercov loads about 415 tokens when it runs. Until then it costs about 86 tokens; SKILL.md has 202 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~86
When it runs · the whole SKILL.md, loaded when a task matches
~415

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 supercorp-ai/supercov at commit d337a58, republished under its MIT licence (© supercorp-ai). 202 words, ~415 tokens.

Download SKILL.mdSave it as .claude/skills/supercov/SKILL.md (or your agent's skills folder).
name
supercov
description
Measures test coverage and code quality in a repository with the supercov CLI, and turns what it finds into small, focused tests or fixes. Use when the user asks to add or improve tests, find untested code or raise coverage, or find what to refactor. Works with JavaScript, TypeScript, Python, Ruby, Rust, Go, Java and Kotlin projects.
license
MIT

Supercov

Supercov runs the project's own test command and changes no source, tests or configuration. npx supercov docs <topic> prints the guide for the installed version; read it for anything not shown here. Topics: agent-loop, quality, supported-suites, troubleshooting.

Add a test

  1. Measure the full suite: npx supercov -- <test command>, for example npx supercov -- npm test.
  2. List targets with npx supercov runs latest gaps --limit 5, pick one, and inspect it with npx supercov runs latest file <path>.
  3. Write one focused test. Change only tests unless the user asks otherwise.
  4. Rerun the same command and report the test and the coverage before and after.

Quality

  • npx supercov quality ranks files by code smells, and npx supercov quality patch reports what a change introduced.
  • It sends source files to TypeSafe using the TYPESAFE_API_KEY environment variable. A user who set the key has opted in, so run it without asking again. If the key is missing the command says so: tell the user how to set it, then answer from reading the code and say Supercov did not check it.

Without Node.js 22 or newer, install Supercov as the language guide at https://supercov.com/docs says, and run supercov instead of npx supercov.

© supercorp-ai, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in plugins/supercov/skills/supercov of supercorp-ai/supercov.

Open the folder on GitHubat commit d337a58

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in supercorp-ai/supercov, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Supercov 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.

Supercov compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Supercov this skillsupercorp-ai/supercov1521 repos~415Automated safety check: PassMIT
Polyglot Test Agentboshi-xixixi/TraeSkill276—~1.7kAutomated safety check: PassMIT
Cross-Language Coding Standardszereight/gitlab-mcp2k1 repos~1.4kAutomated safety check: PassMIT
Test Revieweraxelixlabs/axelix148—~3.2kAutomated safety check: PassLGPL-3.0
Code Reviewerjewbetcha/opentrace1162 repos~1.1kAutomated safety check: NotesMIT
Fory Version Bumpapache/fory4.6k—~1.1kAutomated safety check: PassApache-2.0

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More from supercorp-ai/supercov

  • Supercov Security

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Works with

Categories

Questions about Supercov

What does Supercov do?

Measures test coverage and code quality in a repository with the supercov CLI, and turns what it finds into small, focused tests or fixes. Supercov is an agent skill from supercorp-ai/supercov. Measures test coverage and code quality in a repository with the supercov CLI, and turns what it finds into small, focused tests or fixes.

When should I use Supercov?

Supercov fits situations like: the user asks to add; find untested code; find what to refactor.

How do I install Supercov in Claude Code?

Run `npx skills add supercorp-ai/supercov --skill supercov -a claude-code`. Or copy the skill folder (plugins/supercov/skills/supercov in supercorp-ai/supercov) into .claude/skills/supercov in your project. Claude Code loads it when a task matches its description.

How do I install Supercov in Codex?

Run `npx skills add supercorp-ai/supercov --skill supercov -a codex`. Or copy the skill folder (plugins/supercov/skills/supercov in supercorp-ai/supercov) into .agents/skills/supercov in your project. Codex loads it when a task matches its description.

Can I use Supercov 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 supercorp-ai/supercov --skill supercov -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/supercov, .gemini/skills/supercov, .github/skills/supercov and .opencode/skills/supercov in your project.

What does Supercov need to run?

Going by SKILL.md and its folder, Supercov needs the command-line tools its instructions call (npx) and credentials named TYPESAFE_API_KEY. Our summary lists: Node.js; A credential in TYPESAFE_API_KEY.

Does Supercov access the network?

SKILL.md names 1 domain. As links in the text: supercov.com. This is read from the text; nothing was executed.

Is Supercov 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 Supercov use?

Supercov 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 Supercov use?

About 415 tokens (SKILL.md is roughly 1.7k 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 Supercov?

Skills that share tags, products or a category with Supercov: Polyglot Test Agent (boshi-xixixi/TraeSkill, 276 stars), Cross-Language Coding Standards (zereight/gitlab-mcp, 2k stars), Test Reviewer (axelixlabs/axelix, 148 stars) and Code Reviewer (jewbetcha/opentrace, 116 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Supercov?

supercorp-ai (a GitHub organization) maintains it in supercorp-ai/supercov, which has 152 GitHub stars. The repository holds 2 skills in this directory. The repository was last updated on October 9, 2026.

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