/check
Confirm a change before merge. `/check verify` drives the real app to prove behavior against the spec (every acceptance criterion met, every surface built). `/check review` runs a senior code review on a fresh model, one that did not write the code. Verify after /develop, review
$ npx -y skills add javascript-mastery-pro/skills --skill check --agent claude-codeHow it fires
How this skill gets triggered: by you, by Claude, or both.
- Fires itselfAuto-invocation. Claude auto-loads it when your prompt matches the work.Auto-invocation is when the right skill fires by itself at the right moment, driven by a FLOW.md router and a hook, instead of you invoking it by name. It is the difference between a skill being installed and a skill actually getting used.Read the full definition →
- You can call itInvoke it directly when you want it.
- Slash command
/check
Context preview
The summary Claude sees to decide when to auto-load this skill.
Confirm a change before merge. `/check verify` drives the real app to prove behavior against the spec (every acceptance criterion met, every surface built). `/check review` runs a senior code review on a fresh model, one that did not write the code. Verify after /develop, review
SKILL.md
check.SKILL.mdname: check
allowed-tools: Bash, Read, Grep, Glob, Write, Agent
argument-hint: [verify | review]
description: "Confirm a change before merge. `/check verify` drives the real app to prove behavior against the spec (every acceptance criterion met, every surface built). `/check review` runs a senior code review on a fresh model, one that did not write the code. Verify after /develop, review before a PR. Writes to docs/reviews/, never edits code."
Output style (plain words, no dashes, no hyphens)
<!-- OUTPUT-STYLE:START --> Write everything this skill produces, files and messages alike, in plain simple language. Talk to the reader as `you`, warm and direct like a colleague, and present every step as a recommendation they may run or skip, never an order. Keep technical terms that carry real meaning; explain each in plain words. Never use a dash or a hyphen as punctuation: no em dash, no en dash, and no hyphenated compounds. Write `read only`, not `read-only`. Say it in simple words, or reword the sentence. Code, file paths, command flags, and values other skills match on keep their hyphens. Use short sentences, commas, or parentheses. Clear beats clever. <!-- OUTPUT-STYLE:END -->
What this skill does
`/check` is the gate before merge. Two modes, separate jobs, usually both, verify first:
- **`verify`** (runtime proof): run the real app and watch the change behave. Proves it works and conforms to the spec (every acceptance criterion met, every specced surface built), which green tests never reveal. Read only on code, no durable files, main thread. Typically after `/develop`.
- **`review`** (fresh model code review): a senior read of the diff on a **different model than wrote the code** (a model reviewing its own output shares its blind spots). Writes findings ranked by severity to `docs/reviews/`. Read only. Typically before a PR.
Neither mode edits code. `verify` points failures at `/debug` or `/develop`; `review` reports findings to fix.
Pick the mode (route before doing anything else)
First step, before reading any mode file or touching the repo. Look at what followed `/check`:
- **Starts with `verify` (or `run`)** → read `modes/verify.md`, follow it fully. Pass remaining arguments (feature name, scope) through.
- **Starts with `review`** → read `modes/review.md`, follow it fully. Pass the steering through unchanged (e.g. `/check review with opus`, `/check review uncommitted`).
- **No mode word, or ambiguous** (bare `/check`, or a feature name with no mode like `/check auth`) → do NOT guess, do NOT default. Show the two options as a plain text panel and **stop and wait** for the engineer's choice.
**How to present the choice (plain text, works on every agent, no interactive modal):**
Print exactly this, then stop and wait. Do not assume `verify` until they answer. Route on their typed word (`verify` / `review` / `both`).
Which check do you want to run? Type one:
• verify run the real app and prove the change works against its spec (usually right after /develop)
• review a fresh model senior read of the diff, ranked findings (usually right before a PR)
• both verify first, then review
No interactive picker or modal: a typed choice shown inline behaves the same in every AI tool. (The `argument-hint` frontmatter also surfaces `verify | review` in Claude Code autocomplete; other tools ignore it, which is why this inline panel is the portable path.)
If a feature name came with no mode (`/check auth`), carry it as the target once they pick; still ask the mode.
Do not mix modes in one run. On **both**, do `verify` first, then offer `review` next.
Portability (any OS, any agent)
Any Agent Skills client on macOS, Linux, or Windows. `git` is the only required CLI. Other shell snippets are POSIX reference, not literal scripts: use your agent's own cross platform file, process, and browser tools. Each mode file adds its own portability notes. No subagent support falls back to inline, noted per mode.
Bundled files: `modes/verify.md`, `modes/review.md`, plus `review-agent-prompt.md` and `review-guide.md` for review. Read only the mode file you routed to; resolve the review bundled files to absolute paths when spawning the reviewer.
Read more
name: check allowed-tools: Bash, Read, Grep, Glob, Write, Agent argument-hint: [verify | review] description: "Confirm a change before merge. `/check verify` drives the real app to prove behavior against the spec (every acceptance criterion met, every surface built). `/check review` runs a senior code review on a fresh model, one that did not write the code. Verify after /develop, review before a PR. Writes to docs/reviews/, never edits code."
Output style (plain words, no dashes, no hyphens)
<!-- OUTPUT-STYLE:START --> Write everything this skill produces, files and messages alike, in plain simple language. Talk to the reader as `you`, warm and direct like a colleague, and present every step as a recommendation they may run or skip, never an order. Keep technical terms that carry real meaning; explain each in plain words. Never use a dash or a hyphen as punctuation: no em dash, no en dash, and no hyphenated compounds. Write `read only`, not `read-only`. Say it in simple words, or reword the sentence. Code, file paths, command flags, and values other skills match on keep their hyphens. Use short sentences, commas, or parentheses. Clear beats clever. <!-- OUTPUT-STYLE:END -->
What this skill does
`/check` is the gate before merge. Two modes, separate jobs, usually both, verify first:
- **`verify`** (runtime proof): run the real app and watch the change behave. Proves it works and conforms to the spec (every acceptance criterion met, every specced surface built), which green tests never reveal. Read only on code, no durable files, main thread. Typically after `/develop`.
- **`review`** (fresh model code review): a senior read of the diff on a **different model than wrote the code** (a model reviewing its own output shares its blind spots). Writes findings ranked by severity to `docs/reviews/`. Read only. Typically before a PR.
Neither mode edits code. `verify` points failures at `/debug` or `/develop`; `review` reports findings to fix.
Pick the mode (route before doing anything else)
First step, before reading any mode file or touching the repo. Look at what followed `/check`:
- **Starts with `verify` (or `run`)** → read `modes/verify.md`, follow it fully. Pass remaining arguments (feature name, scope) through.
- **Starts with `review`** → read `modes/review.md`, follow it fully. Pass the steering through unchanged (e.g. `/check review with opus`, `/check review uncommitted`).
- **No mode word, or ambiguous** (bare `/check`, or a feature name with no mode like `/check auth`) → do NOT guess, do NOT default. Show the two options as a plain text panel and **stop and wait** for the engineer's choice.
**How to present the choice (plain text, works on every agent, no interactive modal):**
Print exactly this, then stop and wait. Do not assume `verify` until they answer. Route on their typed word (`verify` / `review` / `both`).
Which check do you want to run? Type one: • verify run the real app and prove the change works against its spec (usually right after /develop) • review a fresh model senior read of the diff, ranked findings (usually right before a PR) • both verify first, then review
No interactive picker or modal: a typed choice shown inline behaves the same in every AI tool. (The `argument-hint` frontmatter also surfaces `verify | review` in Claude Code autocomplete; other tools ignore it, which is why this inline panel is the portable path.)
If a feature name came with no mode (`/check auth`), carry it as the target once they pick; still ask the mode.
Do not mix modes in one run. On **both**, do `verify` first, then offer `review` next.
Portability (any OS, any agent)
Any Agent Skills client on macOS, Linux, or Windows. `git` is the only required CLI. Other shell snippets are POSIX reference, not literal scripts: use your agent's own cross platform file, process, and browser tools. Each mode file adds its own portability notes. No subagent support falls back to inline, noted per mode.
Bundled files: `modes/verify.md`, `modes/review.md`, plus `review-agent-prompt.md` and `review-guide.md` for review. Read only the mode file you routed to; resolve the review bundled files to absolute paths when spawning the reviewer.
A set of Agent Skills that take a change from a vague idea to shipped, verified, documented code, for any AI coding agent. One skill per phase. Run only the ones a change needs, in any order.
Other skills on jsmastery-pro-skills.
- /architect
Run /architect when choosing between approaches, designing a feature or page, picking a tech stack, or when /develop says a decision is owed, anytime a load bearing technical decision is unmade. Asks deep questions, recommends an answer, and writes a build spec to docs/specs/.
Open skill - /audit
Run /audit on a greenfield project, an existing codebase with missing docs, or one area (/audit src/auth) to bootstrap the project's AI context, the AGENTS.md files every later skill reads. Writes tool agnostic AGENTS.md plus thin CLAUDE.md pointers, adding only what is missing;
Open skill - /debug
Run /debug to find and fix a bug's root cause: a test failing for an unclear reason, /check verify finding a failure, or behavior being wrong. Runs a reproduce, localize, hypothesize, test, fix, verify loop, makes the minimal fix, and hands a regression test to /test. No
Open skill - /develop
Run /develop to build a feature, UI or backend, from an approved design, a page, component, API, service, or data slice. If something load bearing is undecided and no spec records it, it stops and routes you to /architect; otherwise it reads the spec plus AGENTS.md, builds, and
Open skill - /document
Run /document `pr` | `changelog` | `release-note` | `postmortem` (or let it ask) to write the human facing prose about a change. Drafts from the real commits and diff, writing to the right place. Does not write code, tests, or specs.
Open skill - /scope
Run /scope to turn a product idea into a living, coarse scope in docs/scope/ and keep it current: plan a new product, plan the next slice, enroll one named feature, or run with no argument to reconcile after shipping and queue what is next. Seeds WHAT to build; /architect
Open skill

