testing-expert vs DiffCI
testing-expert is a plugin bundle for AI coding tools published by C0ntr0lledCha0s. Marketplaces we read that list it: 1 (Community GitHub marketplaces). DiffCI is an MCP server published by DiffCI. Marketplaces we read that list it: 2 (Official MCP Registry, Community GitHub marketplaces). As of our marketplace pass on 2026-10-15. 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 |  DiffCI | |
|---|---|---|
| Community marketplace c0ntr0lledcha0s/claude-code-plugin-automations | Listed Version: 1.1.0 No figure published Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 0.3.1 Downloads/month (npm): 7 181 Downloads/week (npm): 898 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 | testing-expert | DiffCI |
|---|---|---|
| Marketplaces that list it (differs) | 1 (worse) | 2 (better) |
| Stars (GitHub) (differs) | No figure on GitHub | 0 |
| Forks (GitHub) (differs) | No figure on GitHub | 0 |
| Last release (differs) | Not published | 2026-10-14 |
| Where it runs (differs) | Installs as a plugin bundle | Remote server or your machine |
| 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) | 7 | 2 |
| Licence (differs) | MIT | AGPL-3.0-only |
| Repository (differs) | github.com/c0ntr0lledcha0s/claude-code-plugin-automations | github.com/diffci/diffci.com |
| Changes in the last 7 days (differs) | 2 | 5 |
| First seen (differs) | 2026-10-15 | 2026-10-11 |
| Endpoint at the last check (differs) | no remote endpoint we check | Responded 27 h 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
testing-expert
Expert plugin for quality code reviews focused on testing. Provides comprehensive expertise for Jest, Playwright, and test quality analysis with automated test review, coverage analysis, and test suggestions. Includes cheatsheets, templates, and validation scripts.
DiffCI
Fail-closed, change-aware verification for AI coding agents with affected-test guidance.
How to run each
testing-expert As a Claude Code plugin
/plugin marketplace add c0ntr0lledcha0s/claude-code-plugin-automations
/plugin install testing-expert@claude-code-plugin-automationsDiffCI As a remote MCP server
claude mcp add --transport http diffci https://diffci.com/mcp/v1Commands built only from what the marketplaces declare; the full set for every client is on each card.
Only DiffCI 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: testing-expert · What it can do: DiffCI · Compare two other plugins
Data comes from public marketplace files in GitHub repositories of their authors. 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.