LayeredCraft
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+# cavecrew
+
+Decision guide. When to delegate to caveman subagents instead of doing the work inline.
+
+## What it does
+
+Tells the main thread when to spawn a caveman-style subagent versus the vanilla equivalent. The win: subagent tool-results inject back into main context verbatim, and caveman output is roughly 1/3 the size of vanilla prose. Across 20 delegations in one session, that is the difference between context exhaustion and finishing the task.
+
+Three subagents:
+
+| Subagent | Job | Use when |
+|----------|-----|----------|
+| `cavecrew-investigator` | Locate code (read-only) | "Where is X defined / what calls Y / list uses of Z" |
+| `cavecrew-builder` | Surgical edit, 1-2 files | Scope is obvious, ≤2 files. Refuses 3+ file scope. |
+| `cavecrew-reviewer` | Diff/file review | One-line findings with severity emoji |
+
+Use vanilla `Explore` or `Code Reviewer` when you want prose, architecture commentary, or rationale. Use main thread directly for one-line answers and 3+ file refactors.
+
+This skill is a decision guide, not a slash command. It activates when the conversation mentions delegation.
+
+## How to invoke
+
+Triggers on phrases like "delegate to subagent", "use cavecrew", "spawn investigator", "save context", "compressed agent output".
+
+## Example chaining
+
+Locate → fix → verify (most common):
+
+1. `cavecrew-investigator` returns site list (`path:line — symbol — note`)
+2. Main thread picks 1-2 sites, hands paths to `cavecrew-builder`
+3. `cavecrew-reviewer` audits the resulting diff
+
+Parallel scout: spawn 2-3 `cavecrew-investigator` calls in one message with different angles (defs, callers, tests). Aggregate in main.
+
+## Model overrides
+
+By default, `cavecrew-reviewer` and `cavecrew-investigator` pin `model: haiku` in their frontmatter; `cavecrew-builder` has no `model:` line (uses the API session default). Set env vars in your shell before launching Claude Code to override per-agent:
+
+| Env var | Agent |
+|---|---|
+| `CAVECREW_REVIEWER_MODEL` | `cavecrew-reviewer` |
+| `CAVECREW_BUILDER_MODEL` | `cavecrew-builder` |
+| `CAVECREW_INVESTIGATOR_MODEL` | `cavecrew-investigator` |
+
+Example — run reviewer on sonnet, keep others on default:
+
+```sh
+export CAVECREW_REVIEWER_MODEL=sonnet
+```
+
+Use the same model name strings you'd use in any Claude Code agent frontmatter (e.g. `haiku`, `sonnet`, `opus`).
+
+Overrides patch only the `model:` line in the installed agent's frontmatter; the prompt body is untouched and keeps receiving upstream updates. Plugin installs only — standalone hook installs have no local agent files to patch. Unset or blank = no change. The patch persists in the installed file until the plugin is updated or reinstalled.
+
+## See also
+
+- [`SKILL.md`](./SKILL.md) — full decision matrix and output contracts
+- [`agents/cavecrew-investigator.md`](../../agents/cavecrew-investigator.md)
+- [`agents/cavecrew-builder.md`](../../agents/cavecrew-builder.md)
+- [`agents/cavecrew-reviewer.md`](../../agents/cavecrew-reviewer.md)
+- [Caveman README](../../README.md) — repo overview
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+---
+name: cavecrew
+description: >
+  Decision guide for delegating to caveman-style subagents. Tells the main
+  thread WHEN to spawn `cavecrew-investigator` (locate code), `cavecrew-builder`
+  (1-2 file edit), or `cavecrew-reviewer` (diff review) instead of doing the
+  work inline or using vanilla `Explore`. Subagent output is caveman-compressed
+  so the tool-result injected back into main context is ~60% smaller — main
+  context lasts longer across long sessions.
+  Trigger: "delegate to subagent", "use cavecrew", "spawn investigator/builder/reviewer",
+  "save context", "compressed agent output".
+---
+
+Cavecrew = three subagent presets that emit caveman output. Same job as Anthropic defaults (`Explore`, edit-style agents, reviewer); difference is the tool-result they return is compressed, so main context shrinks per delegation.
+
+## When to use cavecrew vs alternatives
+
+| Task | Use |
+|---|---|
+| "Where is X defined / what calls Y / list uses of Z" | `cavecrew-investigator` |
+| Same but you also want suggestions/architecture commentary | `Explore` (vanilla) |
+| Surgical edit, ≤2 files, scope obvious | `cavecrew-builder` |
+| New feature / 3+ files / cross-cutting refactor | Main thread or `feature-dev:code-architect` |
+| Review diff, branch, or file for bugs | `cavecrew-reviewer` |
+| Deep code review with rationale + alternatives | `Code Reviewer` (vanilla) |
+| One-line answer you already know | Main thread, no subagent |
+
+Rule of thumb: **if you'd want the subagent's output in 1/3 the tokens, pick cavecrew. If you'd want prose, pick vanilla.**
+
+## Why this exists (the real win)
+
+Subagent tool results get injected into main context verbatim. A vanilla `Explore` that returns 2k tokens of prose costs 2k tokens of main-context budget every time. The same finding from `cavecrew-investigator` returns ~700 tokens. Across 20 delegations in one session that's the difference between context exhaustion and finishing the task.
+
+## Output contracts
+
+What main thread can rely on per agent:
+
+**`cavecrew-investigator`**
+```
+<Header>:
+- path:line — `symbol` — short note
+totals: <counts>.
+```
+Or `No match.` Always file-path-first, line-number-attached, backticked symbols. Safe to grep with `path:\d+`.
+
+**`cavecrew-builder`**
+```
+<path:line-range> — <change ≤10 words>.
+verified: <re-read OK | mismatch @ path:line>.
+```
+Or one of: `too-big.` / `needs-confirm.` / `ambiguous.` / `regressed.` (terminal first token).
+
+**`cavecrew-reviewer`**
+```
+path:line: <emoji> <severity>: <problem>. <fix>.
+totals: N🔴 N🟡 N🔵 N❓
+```
+Or `No issues.` Findings sorted file → line ascending.
+
+## Chaining patterns
+
+**Locate → fix → verify** (most common):
+1. `cavecrew-investigator` returns site list.
+2. Main thread picks 1-2 sites, hands paths to `cavecrew-builder`.
+3. `cavecrew-reviewer` audits the diff.
+
+**Parallel scout** (when investigation is broad):
+Spawn 2-3 `cavecrew-investigator` calls in one message (different angles: defs vs callers vs tests). Aggregate in main thread.
+
+**Single-shot edit** (when site is already known):
+Skip investigator. Hand exact path:line to `cavecrew-builder` directly.
+
+## What NOT to do
+
+- Don't use `cavecrew-builder` when you don't already know the file. Spawn investigator first or main thread will eat tokens passing context.
+- Don't chain `cavecrew-investigator → cavecrew-builder` for a 5-file refactor. Builder will return `too-big.` and you'll have wasted a turn.
+- Don't ask `cavecrew-reviewer` for "general feedback" — it returns findings only, no architecture opinions. Use `Code Reviewer` for that.
+- Don't expect prose. Cavecrew output is structured, sometimes terse to the point of cryptic. If a human will read it directly, paraphrase.
+
+## Auto-clarity (inherited)
+
+Subagents drop caveman → normal English for security warnings, irreversible-action confirmations, and any output where fragment ambiguity could be misread. Resume caveman after.
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+# caveman-commit
+
+Terse Conventional Commits. Why over what.
+
+## What it does
+
+Generates commit messages in Conventional Commits format. Subject ≤50 chars, hard cap 72. Imperative mood. Body only when the *why* is non-obvious or there are breaking changes. No AI attribution, no "this commit does X", no emoji unless the project uses them. Body always required for breaking changes, security fixes, data migrations, and reverts — future debuggers need the context.
+
+Outputs only the message. Does not stage, commit, or amend.
+
+## How to invoke
+
+```
+/caveman-commit
+```
+
+Also triggers on phrases like "write a commit", "commit message", "generate commit".
+
+## Example output
+
+Diff: new endpoint for user profile.
+
+```
+feat(api): add GET /users/:id/profile
+
+Mobile client needs profile data without the full user payload
+to reduce LTE bandwidth on cold-launch screens.
+
+Closes #128
+```
+
+Diff: breaking API rename.
+
+```
+feat(api)!: rename /v1/orders to /v1/checkout
+
+BREAKING CHANGE: clients on /v1/orders must migrate to /v1/checkout
+before 2026-06-01. Old route returns 410 after that date.
+```
+
+## See also
+
+- [`SKILL.md`](./SKILL.md) — full LLM-facing instructions
+- [Caveman README](../../README.md) — repo overview
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+---
+name: caveman-commit
+description: >
+  Ultra-compressed commit message generator. Cuts noise from commit messages while preserving
+  intent and reasoning. Conventional Commits format. Subject ≤50 chars, body only when "why"
+  isn't obvious. Use when user says "write a commit", "commit message", "generate commit",
+  "/commit", or invokes /caveman-commit. Auto-triggers when staging changes.
+---
+
+Write commit messages terse and exact. Conventional Commits format. No fluff. Why over what.
+
+## Rules
+
+**Subject line:**
+- `<type>(<scope>): <imperative summary>` — `<scope>` optional
+- Types: `feat`, `fix`, `refactor`, `perf`, `docs`, `test`, `chore`, `build`, `ci`, `style`, `revert`
+- Imperative mood: "add", "fix", "remove" — not "added", "adds", "adding"
+- ≤50 chars when possible, hard cap 72
+- No trailing period
+- Match project convention for capitalization after the colon
+
+**Body (only if needed):**
+- Skip entirely when subject is self-explanatory
+- Add body only for: non-obvious *why*, breaking changes, migration notes, linked issues
+- Wrap at 72 chars
+- Bullets `-` not `*`
+- Reference issues/PRs at end: `Closes #42`, `Refs #17`
+
+**What NEVER goes in:**
+- "This commit does X", "I", "we", "now", "currently" — the diff says what
+- "As requested by..." — use Co-authored-by trailer
+- "Generated with Claude Code" or any AI attribution — unless the user's own rule requires an `Assisted-by`/AI-attribution trailer, then add it as a trailer
+- Emoji (unless project convention requires)
+- Restating the file name when scope already says it
+
+## Examples
+
+Diff: new endpoint for user profile with body explaining the why
+- ❌ "feat: add a new endpoint to get user profile information from the database"
+- ✅
+  ```
+  feat(api): add GET /users/:id/profile
+
+  Mobile client needs profile data without the full user payload
+  to reduce LTE bandwidth on cold-launch screens.
+
+  Closes #128
+  ```
+
+Diff: breaking API change
+- ✅
+  ```
+  feat(api)!: rename /v1/orders to /v1/checkout
+
+  BREAKING CHANGE: clients on /v1/orders must migrate to /v1/checkout
+  before 2026-06-01. Old route returns 410 after that date.
+  ```
+
+## Auto-Clarity
+
+Always include body for: breaking changes, security fixes, data migrations, anything reverting a prior commit. Never compress these into subject-only — future debuggers need the context.
+
+## Boundaries
+
+Only generates the commit message. Does not run `git commit`, does not stage files, does not amend. Output the message as a code block ready to paste. "stop caveman-commit" or "normal mode": revert to verbose commit style.