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How to attach a private coverage report to a pull request with Supercov

Generate one interactive HTML file with run history so a reviewer can see the coverage change.

Short answer: Run npx supercov -- npm test to record a complete run with the test command your repository uses; then run npx supercov report to generate one private, interactive report file; Find the generated file in .supercov/reports/, which the store's own .gitignore keeps out of git. All steps.

Who it is forA developer opening a pull request who wants a reviewer to see the coverage evidence without rerunning the tests.

The problemReviewers often have no easy way to see what a change covered, and raw terminal output is hard to share.

The outcomeA single private report file, stored under .supercov/reports/, that opens in a browser and compares the latest run with the previous snapshot.

What you need first

  • A project with a complete test command the repository already runs, such as npm test, pytest or cargo test
  • Node.js so npx can fetch Supercov, or one of the other install routes in the README
  • A TypeSafe AI API key from https://typesafe.ai, only for quality and security scoring; coverage needs no account

Steps

  1. Run npx supercov -- npm test to record a complete run with the test command your repository uses.
  2. Run npx supercov report to generate one private, interactive report file.
  3. Find the generated file in .supercov/reports/, which the store's own .gitignore keeps out of git.
  4. Attach that single file to your pull request so a reviewer can download it and open it in a browser.

Prompt for your agent

In the repository at <project path>, run `npx supercov -- <test command>` and then `npx supercov report`. Report the path of the file created under .supercov/reports/ and confirm that the file is not tracked by git.

Caveat. The report is written as a file you attach yourself, since the README describes no hosted sharing, so the reviewer receives a copy of the file rather than a live link.

Use this in your AI agent

Ask your agent

Using the Deduped MCP, get the setup steps for supercorp-ai/supercov and "Attach a private coverage report to a pull request"

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claude mcp add --transport http deduped https://dedupedai.com/mcp

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