Requirements
rizsotto/Bear
Write, modify, or review a requirement file under docs/requirements -- pick the single owning file, keep the text contract-only, name IDs so they need no explanation, and verify cross-references and…
Measure and grow the line coverage of the s3s crate. An agent skill from s3s-project/s3s.
Install Code Coverage
$ npx skills add s3s-project/s3s --skill code-coverage -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install s3s-project/s3s code-coverage --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/s3s-project/s3s.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/code-coverage .claude/skills/code-coverage && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "code-coverage" agent skill from https://github.com/s3s-project/s3s/tree/main/.agents/skills/code-coverage into .claude/skills/code-coverage/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-coverage", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/s3s-project/s3s/tree/main/.agents/skills/code-coverageType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add s3s-project/s3s --skill code-coverage -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install s3s-project/s3s code-coverage --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/s3s-project/s3s.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/code-coverage .agents/skills/code-coverage && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "code-coverage" agent skill from https://github.com/s3s-project/s3s/tree/main/.agents/skills/code-coverage into .agents/skills/code-coverage/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-coverage", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add s3s-project/s3s --skill code-coverage -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install s3s-project/s3s code-coverage --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/s3s-project/s3s.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/code-coverage .cursor/skills/code-coverage && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "code-coverage" agent skill from https://github.com/s3s-project/s3s/tree/main/.agents/skills/code-coverage into .cursor/skills/code-coverage/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-coverage", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/s3s-project/s3s.git --path .agents/skills/code-coverage--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add s3s-project/s3s --skill code-coverage -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install s3s-project/s3s code-coverage --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/s3s-project/s3s.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/code-coverage .gemini/skills/code-coverage && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "code-coverage" agent skill from https://github.com/s3s-project/s3s/tree/main/.agents/skills/code-coverage into .gemini/skills/code-coverage/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-coverage", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install s3s-project/s3s code-coverageInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add s3s-project/s3s --skill code-coverage -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/s3s-project/s3s.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/code-coverage .github/skills/code-coverage && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "code-coverage" agent skill from https://github.com/s3s-project/s3s/tree/main/.agents/skills/code-coverage into .github/skills/code-coverage/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-coverage", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add s3s-project/s3s --skill code-coverage -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install s3s-project/s3s code-coverage --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/s3s-project/s3s.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/code-coverage .opencode/skills/code-coverage && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "code-coverage" agent skill from https://github.com/s3s-project/s3s/tree/main/.agents/skills/code-coverage into .opencode/skills/code-coverage/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-coverage", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
code-coverage- GitHub stars
- 311
- Token cost
- ~789 tokens
- SKILL.md length
- 408 words
- Files
- 1
- Skills in repo
- 10
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Measure and grow the line coverage of the s3s crate. An agent skill from s3s-project/s3s.
- Adding tests for generated code
- SKILL.md covers Measure, Which number counts, Where tests for generated code… and Where tests for hand-written…, plus 1 more section
- Calls cargo and just
- Asked how much of s3s is covered
What it does
Code Coverage is an agent skill from s3s-project/s3s. Measure and grow the line coverage of the s3s crate. Use when adding tests for generated code, when asked how much of s3s is covered, or when a coverage number, goal or regression is discussed.
Its SKILL.md is about 790 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Testing & QA, covering Test coverage. The licence is Apache-2.0.
When your agent uses it
- Adding tests for generated code
- Asked how much of s3s is covered
- A coverage number
- Regression is discussed
Example prompts
- “/code-coverage”
What it can do on your machine
Read from SKILL.md and the folder at commit 1e1c52e. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
cargojust
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
github.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Code Coverage loads about 789 tokens when it runs. Until then it costs about 52 tokens; SKILL.md has 408 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from s3s-project/s3s at commit 1e1c52e, republished under its Apache-2.0 licence (© s3s-project). 408 words, ~789 tokens.
Download SKILL.mdSave it as
.claude/skills/code-coverage/SKILL.md (or your agent's skills folder).- name
- code-coverage
- description
- Measure and grow the line coverage of the s3s crate. Use when adding tests for generated code, when asked how much of s3s is covered, or when a coverage number, goal or regression is discussed.
- license
- Apache-2.0
Code coverage
The s3s crate is measured with cargo-llvm-cov. The goal for the crate is 90% line coverage.
Measure
cargo llvm-cov -p s3s --all-features --no-fail-fast --json --summary-only --output-path target/coverage-s3s.json
cargo run -p xtask -- coverage target/coverage-s3s.jsonxtask coverage prints one row per package plus a TOTAL row, and aggregates the per-file counters of the JSON export. --fail-under-lines 90 turns the same command into a gate; no CI job fails on coverage today, so a threshold is only enforced where it is passed explicitly.
Which number counts
- The JSON summary is the reference: the line metric it prints is the one
--fail-under-linesenforces. --lcovand the text report count lines slightly differently and print a higher percentage for the same profile. Name the source of a number, and compare like with like.- The
branchescolumn stays at 0% unless the profile is built with--branch, which needs nightly. - cargo-llvm-cov ignores
tests/directories by default, so test bodies never enter the denominator. Keep it that way: tests belong incrates/s3s/tests/, not next to the code they exercise.
Where tests for generated code live
In crates/s3s/tests/generated/: a single integration-test binary, auto-discovered from tests/generated/main.rs, whose files are written by just codegen from the Smithy models (codegen/src/v1/gen_tests/).
- Extend the generator instead of editing those files by hand: a model change then updates the code and its tests together, and the two cannot drift.
- The module loader and the file set are fixed by the generator; add a family by adding an emitter module, not by dropping a file into the directory.
- Emitters receive the base model and the MinIO model. Mirror the
#[cfg(feature = "minio")]gates of the mergedgenerated.rs, including the two branches of a type that the MinIO patch rewrites. - Assertions must be falsifiable: compare whole values or exact strings rather than
is_empty()-style checks, and prove each family with a red control — inject an error into the production side and watch the matching case fail.
Show full SKILL.md (104 more words)Show less
Where tests for hand-written code live
Next to the existing integration tests in crates/s3s/tests/*.rs.
Growing the number
- Start from the biggest gaps.
xtask coveragegives the per-package rows; readdata[0].filesof the export, orcargo llvm-cov report, for the per-file ones. - Do not modify production code only to make a line coverable. Private items, defensive branches, branches decided by a
cfg!constant and LLVM line-mapping artifacts are recorded as unreachable instead. - Attempt a cheaper input before writing a line off as unreachable: the closing brace of a skipped
if letis covered by feeding the empty value, and a required field by omitting it.
© s3s-project, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in .agents/skills/code-coverage of s3s-project/s3s.
Open the folder on GitHubat commit 1e1c52e
Compare with similar skills
Code Coverage next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Code Coverage this skills3s-project/s3s | 311 | — | ~789 | Automated safety check: Pass | Apache-2.0 | |
| Requirementsrizsotto/Bear | 6.5k | — | ~2k | Automated safety check: Pass | GPL-3.0 | |
| Crap Analysisardalis/RiverBooks | 134 | 2 repos | ~3.4k | Automated safety check: Pass | None | |
| Project Statusbactopia/bactopia | 522 | — | ~787 | Automated safety check: Pass | MIT | |
| Check Coverageldayton/Dippy | 243 | — | ~403 | Automated safety check: Pass | MIT | |
| Guarding Destructive Operationskajisho5/ffmpeg-skill | 1.9k | — | ~2.6k | Automated safety check: Pass | MIT |
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Crap Analysis
ardalis/RiverBooks
Analyze code coverage and CRAP (Change Risk Anti-Patterns) scores to identify high-risk code.
Project Status
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Show a live snapshot of the Bactopia project state — component counts, GroovyDoc coverage, nf-test coverage, and structural issues.
Check Coverage
ldayton/Dippy
Ensure comprehensive test coverage for a CLI handler. An agent skill from ldayton/Dippy.
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Work with stacked pull requests in this repository using gh stack.
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Review a pull request or a proposed change to this repository.
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Change generated code in this repository. An agent skill from s3s-project/s3s.
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Related
Categories
Questions about Code Coverage
What does Code Coverage do?
Measure and grow the line coverage of the s3s crate. An agent skill from s3s-project/s3s. Code Coverage is an agent skill from s3s-project/s3s. Measure and grow the line coverage of the s3s crate.
When should I use Code Coverage?
Code Coverage fits situations like: adding tests for generated code; asked how much of s3s is covered; A coverage number; regression is discussed.
How do I install Code Coverage in Claude Code?
Run `npx skills add s3s-project/s3s --skill code-coverage -a claude-code`. Or copy the skill folder (.agents/skills/code-coverage in s3s-project/s3s) into .claude/skills/code-coverage in your project. Claude Code loads it when a task matches its description.
How do I install Code Coverage in Codex?
Run `npx skills add s3s-project/s3s --skill code-coverage -a codex`. Or copy the skill folder (.agents/skills/code-coverage in s3s-project/s3s) into .agents/skills/code-coverage in your project. Codex loads it when a task matches its description.
Can I use Code Coverage in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add s3s-project/s3s --skill code-coverage -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/code-coverage, .gemini/skills/code-coverage, .github/skills/code-coverage and .opencode/skills/code-coverage in your project.
What does Code Coverage need to run?
Going by SKILL.md and its folder, Code Coverage needs the command-line tools its instructions call (cargo and just).
Does Code Coverage access the network?
SKILL.md names 1 domain. As links in the text: github.com. This is read from the text; nothing was executed.
Is Code Coverage safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Code Coverage use?
Code Coverage is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Code Coverage use?
About 789 tokens (SKILL.md is roughly 3.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Code Coverage?
Skills that share tags, products or a category with Code Coverage: Requirements (rizsotto/Bear, 6.5k stars), Crap Analysis (ardalis/RiverBooks, 134 stars), Project Status (bactopia/bactopia, 522 stars) and Check Coverage (ldayton/Dippy, 243 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Code Coverage?
s3s-project (a GitHub organization) maintains it in s3s-project/s3s, which has 311 GitHub stars. The repository holds 10 skills in this directory. The repository was last updated on October 7, 2026.
Source: s3s-project/s3s on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.