The request "diff_cover" names no specific product, so these are candidates for measuring what a change touches and its test coverage. Codecov-style coverage comparison for pull requests is offered by Smart145 [9,19], while Fallow [6,16] and DiffCI 2 analyze changed code and affected tests, and GitHub [1,11] provides commit and pull-request diff comments.
A question back: Which language, test runner and CI platform does your project use?
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GitHubgithub.comverified and signed
Runs pytest with coverage to find lines missing coverage, and offers line comments on pull request diffs 11.
official:CLI · github-mcp-serverskill · add-community-extensionskill · git-commitskill · acquire-codebase-knowledge+2,468 community tools built for it
for agents: pytest-coverage · github_create_commit_comment · github_create_pull_request_review_comment
Sources
- 1GitHub · Change is constant. GitHub keeps you ahead. · GitHub · GitHubgithub.com · read 2026-10-29
- 2Change-Aware CI Analysis & Test Selection | DiffCIdiffci.com · read 2026-10-30
- 6Fallow: codebase intelligence for TypeScript and JavaScriptfallow.tools · read 2026-10-29
- 11pytest-coverage: declares "pytest-coverage" (the record we read and signed)unfragile.ai · read 2026-10-24
- 16fallow-skills: declares "fallow_audit" (the record we read)github.com · read 2026-10-24
- 19codecov-mcp-server: declares "codecov_compare_coverage" (the record we read)github.com · read 2026-10-24
For agents: the 10 actions behind this answer
pytest-coverage · pytest-coverage verified and signed
Run pytest tests with coverage, discover lines missing coverage, and increase coverage to 100%.
diffci_verify_changed · DiffCI found in code, not yet checked
Verify the current staged, unstaged, and non-ignored untracked changes. Fails closed unless the exact working-tree snapshot passes selected or full fallback verification.
diff-intake · diff-intake verified and signed
Reads a PR or branch diff and produces a structured YAML change brief for downstream analytics instrumentation skills. Use this as the first step whenever a user shares a PR link, branch comparison, or raw diff and wants to understand what changed, what needs tracking, or how to instrument a feature
GET /repositories/{workspace}/{repo_slug}/diffstat/{spec} · Bitbucket API verified and signed
Compare two commit diff stats
· Kaicontext website read, tools not yet checked
An independent reviewer that traces your changes through a semantic map of your codebase.
fallow_audit · fallow-skills found in code, not yet checked
Gate the changes of the current branch before a commit or a pull request. Returns pass, warn or fail, and separates findings that the branch introduced from findings that existed before.
checking-changes · checking-changes verified and signed
Validates all code changes before committing by running format, lint, type, and unit test checks. Use after making backend (Python) or frontend (TypeScript) changes, before committing or finishing a work session.
· Refactron website read, tools not yet checked
Prove that any change, your AI agent's, a codemod's, or your own, preserved behavior. Refactron runs your real tests in an isolated shadow tree and lands only on green, with a reproducible, audit-grade record of why it's safe.
codecov_compare_coverage · codecov-mcp-server found in code, not yet checked
Compare coverage for a pull request (preferred) or between commits/branches. When pullid is provided, base/head are ignored. Shows coverage diff, changed files, and patch coverage. Essential for reviewing coverage impact of changes.
· diffpulse website read, tools not yet checked
DiffPulse analyzes pull requests, architecture impact, and engineering policy to surface risk before code reaches production.
Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.