experiment-tracker vs Testers.ai CARBON Test Harness Lite
experiment-tracker is a plugin bundle for AI coding tools published by Michael Galpert. Marketplaces we read that list it: 1 (Community GitHub marketplaces). Testers.ai CARBON Test Harness Lite is an MCP server published by jarbon. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-11-10. 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 |  Testers.ai CARBON Test Harness Lite | |
|---|---|---|
| Community marketplace ccplugins/awesome-claude-code-plugins | Listed Version: 1.0.0 Forks (GitHub): 832 Stars (GitHub): 1 000 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 0.1.0 Forks (GitHub): 1 Stars (GitHub): 2 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 | experiment-tracker | Testers.ai CARBON Test Harness Lite |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 1 000 (better) | 2 (worse) |
| Forks (GitHub) (differs) | 832 (better) | 1 (worse) |
| Last release | Not published | Not published |
| Where it runs (differs) | Installs as a plugin bundle | On your machine (https://github.com/jarbon/carbon-lite/releases/download/mcp-v0.1.0/carbon-lite-mcp-0.1.0.mcpb) |
| Transport (differs) | Not stated | stdio |
| 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 | Not stated | Not stated |
| Repository (differs) | github.com/ccplugins/awesome-claude-code-plugins | github.com/jarbon/carbon-lite |
| Changes in the last 7 days | 0 | 0 |
| First seen (differs) | 2026-10-15 | 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
experiment-tracker
PROACTIVELY use this agent when experiments are started, modified, or when results need analysis. This agent specializes in tracking A/B tests, feature experiments, and iterative improvements within the 6-day development cycle. Should be triggered automatically when experimental code paths or feature flags are introduced. Examples:\n\n<example>\nContext: When implementing feature flags or A/B test variants\nuser: "Add a feature flag to test the new onboarding flow"\nassistant: "I've implemented the feature flag for the onboarding flow A/B test. Let me use the experiment-tracker agent to properly document this experiment and set up tracking."\n<commentary>\nEvery feature flag represents an experiment that needs proper tracking and success metrics.\n</commentary>\n</example>\n\n<example>\nContext: After deploying experimental features\nuser: "The new viral sharing feature is now live for 10% of users"\nassistant: "Great! The viral sharing feature is deployed. I'll use the experiment-tracker agent to monitor its
Testers.ai CARBON Test Harness Lite
Local QA workflows, test evidence, screenshot maps and confidence reports for AI coding agents.
How to run each
experiment-tracker As a Claude Code plugin
/plugin marketplace add ccplugins/awesome-claude-code-plugins
/plugin install experiment-tracker@awesome-claude-code-pluginsTesters.ai CARBON Test Harness Lite
No data for an automatic command: what its marketplaces declare does not say unambiguously how to connect it.
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
Neither one's marketplaces publish the settings it asks for.
What it can do: experiment-tracker · What it can do: Testers.ai CARBON Test Harness Lite · 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.