skillcheck-free vs Sigistry Plugin & Skill Catalog
skillcheck-free is a plugin bundle for AI coding tools published by olgasafonova. Marketplaces we read that list it: 1 (Claude Code: claude-plugins-community). Sigistry Plugin & Skill Catalog is an MCP server published by sigistry.com. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-26. 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 |  skillcheck-free |  Sigistry Plugin & Skill Catalog |
|---|---|---|
| Claude Code: claude-plugins-community | Listed Version: 3.20.1 Forks (GitHub): 2 Stars (GitHub): 42 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 1.5.0 No figure published 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 | skillcheck-free | Sigistry Plugin & Skill Catalog |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 42 | No figure on GitHub |
| Forks (GitHub) (differs) | 2 | No figure on GitHub |
| Last release | Not published | Not published |
| Where it runs (differs) | Installs as a plugin bundle | Remote server (sigistry.com/mcp) |
| Transport (differs) | Not stated | Streamable HTTP |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Parts of the bundle (differs) | 1 | Not a bundle |
| Licence (differs) | MIT | Not stated |
| Repository (differs) | github.com/olgasafonova/skillcheck-free | Not stated |
| Changes in the last 7 days | 0 | 0 |
| First seen (differs) | 2026-10-12 | 2026-10-11 |
| Endpoint at the last check (differs) | no remote endpoint we check | Responded 3 days ago |
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
skillcheck-free
SkillCheck Free validates Claude Code SKILL.md files against ~25 contract rules covering structure, naming, semantic consistency, and quality patterns. It catches missing frontmatter, weak or ambiguous descriptions, trigger collisions, anti-pattern formatting (prose where tables belong), naming smells, and contradictions before users encounter them. Runs locally — it's itself a SKILL.md the agent reads, with no API calls, binaries, or external services. MIT-licensed. Works in Claude Code, Claude Desktop/Web (Projects), and Cursor. The Free tier covers structural, semantic, and naming checks plus quality-pattern recognition. SkillCheck Pro (separate product at getskillcheck.com) adds anti-slop detection, security scanning, token budget analysis, WCAG accessibility, and enterprise readiness checks.
Sigistry Plugin & Skill Catalog
Search verified Claude Code plugins and skills; fetch portable SKILL.md sources. Read-only.
How to run each
skillcheck-free As a Claude Code plugin
/plugin marketplace add anthropics/claude-plugins-community
/plugin install skillcheck-free@claude-communitySigistry Plugin & Skill Catalog As a remote MCP server
claude mcp add --transport http plugin-catalog https://sigistry.com/mcpCommands built only from what the marketplaces declare; the full set for every client is on each card.
Only Sigistry Plugin & Skill Catalog has a remote endpoint we check. How we check endpoints
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
Neither one's marketplaces publish the settings it asks for.
What it can do: skillcheck-free · What it can do: Sigistry Plugin & Skill Catalog · 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.