agentmods.dev

coverage-gaps

Find untested code paths and report coverage gaps in the vlist project.

Skill for Claude CodeCodex

16 1mo ago A scan 18 tokens original MIT
View the source file floor/vlist
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 skills/floor/vlist/coverage-gaps
Any agent
npx skills add floor/vlist --skill coverage-gaps
Clone the repo
git clone --depth 1 https://github.com/floor/vlist

Made for: Claude Code, Codex.

Per session 18 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 377 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 $0.00018 $0.00377
Opus 5 $0.00009 $0.00188
Sonnet 5 $0.00004 $0.00075
Haiku 4.5 $0.00002 $0.00038

Measured today against content hash 64bf8fd1e3e4, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

coverage-gaps 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 today.

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.

.claude/skills/coverage-gaps/SKILL.md · 42 lines

What it actually says

Find Coverage Gaps

Identify untested code in the vlist project.

Instructions

  1. Determine scope:

    • If $ARGUMENTS names a feature (e.g., grid, async), run coverage for that feature's tests
    • If $ARGUMENTS names a file path, run coverage for tests covering that file
    • If no arguments, run full coverage

  2. Run coverage:

    • Scoped: bun test --coverage test/features/$ARGUMENTS/ 2>&1 or bun test --coverage $ARGUMENTS 2>&1
    • Full: bun test --coverage 2>&1

  3. Parse the coverage output and report:

    • Files with less than 100% line coverage, sorted worst-first
    • For each gap, read the source file and identify which functions/branches are likely uncovered
    • Suggest specific test cases that would close the gaps

  4. Output format:

    ## Coverage Gaps

### src/features/async/feature.ts — 87% lines
- `handleLoadError()` (lines 45-62) — no test for error path
- Suggested test: "should handle adapter rejection gracefully"

### src/rendering/renderer.ts — 92% lines
- `recycleElement()` (lines 120-128) — pool-full branch untested
- Suggested test: "should discard element when pool is at capacity"

  5. If everything is at 100%: Full coverage — no gaps found.

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. today First seen · 42 lines · 18 tokens per session scan A 64bf8fd1e3e4

Subscribe to this mod's changes

coverage-gaps is a skill published in the GitHub repository floor/vlist (16 stars, last pushed 1mo ago), licensed MIT. It adds 18 tokens to every session and 377 once invoked, about $0.0001 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 2026-09-01.

Testinglightweightperformancetypescriptvirtual-listvirtual-scrollvirtualization
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