caveman vs GitWhy — The Context Layer for Git
caveman is a plugin bundle for AI coding tools published by JuliusBrussee. Marketplaces we read that list it: 1 (Claude Code: claude-plugins-community). GitWhy — The Context Layer for Git is an MCP server published by gitwhy-cli. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-13. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  caveman |  GitWhy — The Context Layer for Git |
|---|---|---|
| Claude Code: claude-plugins-community | Listed Version: 3098342 Forks (GitHub): 6 442 Stars (GitHub): 111 206 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 0.7.9 Downloads/month (npm): 151 Downloads/week (npm): 33 Forks (GitHub): 0 Stars (GitHub): 0 Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | caveman | GitWhy — The Context Layer for Git |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 111 206 (better) | 0 (worse) |
| Forks (GitHub) (differs) | 6 442 (better) | 0 (worse) |
| Last release | Not published | Not published |
| Where it runs (differs) | Installs as a plugin bundle | On your machine (gitwhy-mcp) |
| Transport (differs) | Not stated | stdio |
| Tools it declares | Not published | Not published |
| Environment variables it asks for (differs) | Not published | 1, secrets among them: 1 |
| Hooks it runs (differs) | 2 | Not published |
| Parts of the bundle (differs) | 17 | Not a bundle |
| Licence | Not stated | Not stated |
| Repository (differs) | github.com/juliusbrussee/caveman | github.com/gitwhy-cli/gitwhy |
| Changes in the last 7 days | 0 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
caveman
Auto-activation works differently per agent: Claude Code uses SessionStart hooks, this repo's Codex dogfood setup uses .codex/hooks.json, Gemini uses context files. Cursor/Windsurf/Cline/Copilot can be made always-on, but npx skills add installs only the skill, not the repo rule/instruction files. ¹ Codex uses $caveman syntax, not /caveman. This repo ships .codex/hooks.json, so caveman auto-starts when you run Codex inside this repo. The installed plugin itself gives you $caveman; copy the same hook into another repo if you want always-on behavior there too. caveman-commit and caveman-review are not in the Codex plugin bundle — use the SKILL.md files directly. ² Add the "Want it always on?" snippet below to those agents' system prompt or rule file if you want session-start activation. ³ Cursor and Windsurf receive the full SKILL.md with all intensity levels. Mode switching works on-demand via the skill; no slash command. ⁴ Available in Claude Code, but plugin install only nudges setup. Standalone install.sh /
GitWhy — The Context Layer for Git
The shared AI context engine for git — save, search, and share the reasoning behind code changes.
How to run each
caveman As a Claude Code plugin
/plugin marketplace add anthropics/claude-plugins-community
/plugin install caveman@claude-communityGitWhy — The Context Layer for Git As a local MCP server: npm package
claude mcp add --env "GITWHY_API_KEY=<YOUR_GITWHY_API_KEY>" --transport stdio gitwhy -- npx -y gitwhy-mcpRequires: GITWHY_API_KEY (secret)
Commands built only from what the marketplaces declare; the full set for every client is on each card.
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
The marketplaces of caveman publish no settings it asks for, so we do not compare settings.
What it can do: caveman · What it can do: GitWhy — The Context Layer for Git · Compare two other plugins
Data comes from the public marketplace file https://github.com/anthropics/claude-plugins-community/blob/HEAD/.claude-plugin/marketplace.json. Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.