Cavekit plugin for Grok Build
Frozen — compressed spec-driven development plugin for Claude Code. Still works; active development moved to JuliusBrussee/caveman.
How to install Cavekit in Grok Build
grok plugin install JuliusBrussee/cavekit --trustReview before you trust it. --trust lets this plugin's hooks, MCP servers and scripts run code on your computer. It's a community repo that neither xAI nor GrokStacks has reviewed, so read its code first.
We install this repo directly: Grok Build 1.0.62 can't install it through its own marketplace file. Then start a new Grok session, or press r in /plugins, to load it.
Command format: Grok Build's plugin guide
What we checked: on Oct 18, 2026 it installed with grok 1.0.62 and Grok found 9 skills, 7 slash commands. That's an install check only: we haven't run it in a live Grok session.
What it contains
Skills (9)
backprop— Bug → spec protocol. When a bug is found or a test fails, trace the cause, decide whether a new §V invariant would catch recurrence, append to §B. This is the one non-obvious thing SDD does that plan-then-execute doesn't. Triggers on test fbuild— Plan-then-execute implementation against SPEC.md. Native single-thread loop, no sub-agents. On test or build failure, auto-invokes the backprop skill before retrying — a failed verification always considers whether a new §V invariant wouldcaveman— Caveman encoding for SPEC.md and spec-adjacent writes. Loaded by /spec, /build, /check. Cuts tokens ~75% vs prose while staying precise. Triggers on any write to SPEC.md or when user says "caveman", "compress this", "be brief".check— Read-only drift detector. Diffs SPEC.md against current code and reports violations grouped by severity. Writes nothing — suggests remedies via the spec or build skills but never invokes them. Triggers when the user asks to check drift, auddeepen— Optional design-improvement pass for when you have spare usage to drain. Finds the shallowest modules in the code the spec touches, researches a deeper design, and proposes refactors that shrink interfaces and hide decisions — behavior heldgrill— Calibrated interrogation of a fuzzy idea before it becomes a spec. Asks one question at a time, recommends an answer, and lands each answer in §G (goal) or §C (constraints) — unknowns parked as `?` items, never guessed. The cheapest place tresearch— Gather external knowledge the spec needs and distill it into §R — the durable research log — so build grounds in facts instead of hallucinating library behavior. Each finding cites a source; unsourced claims are flagged, never written as fareview— Adversarial senior review of the spec before any code is written. Constructs a skeptical reviewer whose authority comes from the codebase, §R research, and live best-practice — then tries to REFUTE the spec, not rubber-stamp it. Every findispec— Create, amend, or backprop bugs into SPEC.md at repo root. Sole mutator of the project spec. Triggers when the user asks to write a spec, start a new spec, distill a spec from existing code, add invariants, amend sections (§G, §C, §I, §V, §
About this listing
Cavekit is a community plugin on GitHub by JuliusBrussee, written as a Claude Code plugin that Grok Build installs. We install-checked it in Grok; we haven't run it in a live session or reviewed its code. When we installed it, Grok found 9 skills. Its license is MIT. We checked commit 7421e87d5b51. It's one of 34 listings in the Testing category on GrokStacks.
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Cavekit FAQ
How do I install Cavekit in Grok Build?
Run grok plugin install JuliusBrussee/cavekit --trust. We install-checked this command in Grok Build. We install this repo directly: Grok Build 1.0.62 can't install it through its own marketplace file. Then start a new Grok session, or press r in /plugins, to load it.
Is Cavekit an official Grok Build plugin?
No. Cavekit is a community plugin on GitHub by JuliusBrussee, not in xAI's official Grok Build marketplace. We checked that it installs and what Grok loads from it, but haven't run it in a live Grok session or reviewed its code.
What does Cavekit include?
According to what Grok loaded in our install check, Cavekit includes 9 skills: backprop, build, caveman, check, deepen, grill….
Details
- Type
- Plugin
- Category
- Testing
- Source
- Community Claude Code plugin, installs in Grok
- License
- MIT
- Author
- JuliusBrussee
- Version
- 4.1.0
- Keywords
- claude-code, parallel-agents, skills, spec-driven-development, test-driven-development
- Source repo
- https://github.com/JuliusBrussee/cavekit
- Checked commit
7421e87d5b51- Homepage
- https://caveman.so/
- Checked by GrokStacks
- Install-checked in Grok Build on Oct 18, 2026; not run in a live session
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For maintainers: badge and embeds
Maintain Cavekit? Add the badge; it links to this page.
Markdown
[](https://grokstacks.com/p/cavekit/)HTML
<a href="https://grokstacks.com/p/cavekit/"><img src="https://grokstacks.com/badge.svg" alt="Listed on GrokStacks" width="164" height="28"></a>Embed card (static HTML and inline CSS, no JavaScript). Preview:
<a href="https://grokstacks.com/p/cavekit/" style="display:block;max-width:380px;box-sizing:border-box;padding:14px 16px;border:1px solid #2a2e3c;border-radius:12px;background:#0a0b0f;color:#e8eaf0;font:14px/1.45 -apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;text-decoration:none"><span style="display:block;font-size:16px;font-weight:700;color:#e8eaf0">Cavekit</span><span style="display:block;margin:2px 0 8px;font-size:12px;color:#9aa0b1">Community plugin for Grok Build · 9 skills</span><span style="display:block;margin:0 0 10px;color:#c9cdd8">Frozen — compressed spec-driven development plugin for Claude Code. Still works; active development moved to…</span><span style="font-size:12px;font-weight:600;color:#7c9cff">View on GrokStacks →</span></a>Markdown summary
**[Cavekit on GrokStacks](https://grokstacks.com/p/cavekit/)**: Community plugin for Grok Build with 9 skills. Install: `grok plugin install JuliusBrussee/cavekit --trust`More on badges, embeds and keeping your listing up to date: GrokStacks for plugin authors.
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