codecov

name	codecov
description	Fetches test coverage data from Codecov API and identifies coverage gaps. Use when asking about test coverage, finding untested code, or planning coverage improvements. Supports optional path filtering.
allowed-tools	WebFetch Bash(git remote:*)
argument-hint	[path-filter]

Codecov Coverage Analysis

Fetch and analyze test coverage data from Codecov for this repository.

Steps

1. Derive owner/repo from git remote:

   git remote get-url origin
   

   Parse github.com/{owner}/{repo} (strip .git suffix if present).

2. Fetch overall report from:

   https://codecov.io/api/v2/github/{owner}/repos/{repo}/report/?page_size=50
   

3. Apply path filter if $ARGUMENTS is provided:

   • Use ?path={ARGUMENTS}&page_size=50 to filter by directory (e.g., internal, cmd/wt)
   • Otherwise fetch both ?path=cmd&page_size=50 and ?path=internal&page_size=50

4. Extract per-file coverage from the response:

   • Overall totals are in response.totals (coverage, lines, hits, misses, partials)
   • Per-file data is in response.files[] with fields: name, totals.coverage, totals.lines, totals.hits, totals.misses

5. Sort files by missed lines descending and present:

   • Overall coverage percentage
   • Files with 0% coverage (completely untested)
   • Top files by missed lines (partially tested)
   • Actionable recommendations for improving coverage

Output Format

## Coverage Report: {owner}/{repo}

Overall: {coverage}% ({hits}/{lines} lines covered)

### Untested Files (0% coverage)
| File | Lines |
|------|-------|
| path/to/file.go | 42 |

### Top Coverage Gaps (by missed lines)
| File | Coverage | Missed | Total |
|------|----------|--------|-------|
| path/to/file.go | 45.2% | 74 | 135 |

### Recommendations
- ...