coverage

A test-coverage review that measures which parts of a codebase are exercised by automated tests. It reports coverage by project, file, function, and decision branch.

In plain words
What is it for?
Use it to run tests with coverage, find uncovered lines and edge cases, prioritize risky areas, and decide where to add tests next.
Why use it?
It shows where tests are missing instead of relying on an overall percentage alone. It helps distinguish important or recently changed code from lower-priority gaps.

Command

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/cyperx84/claude-code-plugin-examples/coverage
Clone the repo
git clone --depth 1 https://github.com/cyperx84/claude-code-plugin-examples
Per session 6 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 399 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00006 $0.00399
Opus 5 $0.00003 $0.00199
Sonnet 5 $0.00001 $0.00080
Haiku 4.5 $0.00001 $0.00040

Measured yesterday against content hash c602c3960bb1, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

coverage scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

examples/02-intermediate/testing-plugin/commands/coverage.md · 67 lines

What it actually says

Coverage Analysis

Analyze test coverage and identify gaps for: $ARGUMENTS (or entire project if not specified)

Process:

  1. Run coverage analysis:

    • Execute tests with coverage enabled
    • Generate detailed coverage report
    • Identify uncovered code paths
  2. Coverage breakdown:

    • Overall coverage percentage
    • Per-file coverage
    • Per-function coverage
    • Branch coverage analysis
  3. Identify gaps:

    • List uncovered functions
    • Show uncovered lines with context
    • Highlight critical paths without tests
    • Find edge cases not tested
  4. Prioritize:

    • Critical paths (authentication, payment, etc.)
    • Complex functions (high cyclomatic complexity)
    • Recently changed code
    • Public API functions
  5. Recommendations:

    • Suggest which files/functions to test first
    • Offer to generate tests using /agent test-generator
    • Estimate effort to reach coverage goals

Example output:

Coverage Analysis for src/utils/

Overall: 78.4%

High Priority (Critical paths):
❗ src/utils/auth.ts: 45.2% - CRITICAL
   ├─ validateToken(): 0% coverage
   └─ refreshToken(): 0% coverage

Medium Priority (Complex logic):
⚠️  src/utils/parser.ts: 67.8%
   ├─ parseComplexQuery(): 30% coverage
   └─ handleEdgeCases(): 45% coverage

Low Priority:
✓  src/utils/format.ts: 92.1%
✓  src/utils/string.ts: 95.3%

Recommendation:
1. Test auth.ts functions (HIGH PRIORITY)
2. Add edge case tests for parser.ts
3. Target 85% overall coverage (+6.6%)

Generate tests? (y/n)
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 67 lines · 6 tokens per session scan A c602c3960bb1

Subscribe to this mod's changes

coverage is a command published in the GitHub repository cyperx84/claude-code-plugin-examples (2 stars, last pushed 10mo ago), licensed MIT. It adds 6 tokens to every session and 399 once invoked, about $0.0000 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.