test-coverage

A command that measures how much of a project’s code is exercised by tests and creates tests for uncovered paths. Test coverage shows which code runs during testing.

In plain words
What is it for?
Use it to find files below the configured coverage target, add unit, integration, or end-to-end tests, rerun the suite, and compare coverage before and after.
Why use it?
It exposes untested success, error, edge, and boundary cases that may hide defects.

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/cloudnative-co/claude-code-starter-kit/test-coverage
Clone the repo
git clone --depth 1 https://github.com/cloudnative-co/claude-code-starter-kit
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 177 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 80% copy Near-identical to another mod 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 $0.00000 $0.00177
Opus 5 $0.00000 $0.00088
Sonnet 5 $0.00000 $0.00035
Haiku 4.5 $0.00000 $0.00018

Measured 2d ago against content hash 6531b6af9476, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

test-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 2d ago.

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.

Origin

This is a copy

80% identical to test-coverage — 13 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

commands/test-coverage.md · 30 lines

What it actually says

Test Coverage

Analyze test coverage and generate missing tests:

  1. Identify the project's test tooling and run tests with coverage (e.g. npm test --coverage, pytest --cov, go test -cover)

  2. Analyze the coverage report your test runner produces (e.g. coverage/coverage-summary.json for JS)

  3. Identify files below 80% coverage threshold

  4. For each under-covered file:

    • Analyze untested code paths
    • Generate unit tests for functions
    • Generate integration tests for APIs
    • Generate E2E tests for critical flows
  5. Verify new tests pass

  6. Show before/after coverage metrics

  7. Ensure project reaches 80%+ overall coverage

Focus on:

  • Happy path scenarios
  • Error handling
  • Edge cases (null / missing / empty values)
  • Boundary conditions
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. 2d ago First seen · 30 lines · 0 tokens per session scan A 6531b6af9476

Subscribe to this mod's changes

test-coverage is a command published in the GitHub repository cloudnative-co/claude-code-starter-kit (147 stars, last pushed 8d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 177 tokens. A static security scan graded it A with 0 findings. It is 80% identical to test-coverage, differing in 13 lines, and is treated as a copy.