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.
Install
$ agentstack add skill-supercorp-ai-supercov-supercov ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-supercorp-ai-supercov-supercov) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
Supercov
Supercov runs the project's own test command and changes no source, tests or configuration. npx supercov docs prints the guide for the installed version; read it for anything not shown here. Topics: agent-loop, quality, supported-suites, troubleshooting.
Add a test
- Measure the full suite:
npx supercov --, for examplenpx supercov -- npm test. - List targets with
npx supercov runs latest gaps --limit 5, pick one, and inspect it withnpx supercov runs latest file. - Write one focused test. Change only tests unless the user asks otherwise.
- Rerun the same command and report the test and the coverage before and after.
Quality
npx supercov qualityranks files by code smells, andnpx supercov quality patchreports what a change introduced.- It sends source files to TypeSafe using the
TYPESAFE_API_KEYenvironment 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.
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: supercorp-ai
- Source: supercorp-ai/supercov
- License: MIT
- Homepage: https://supercov.com
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.