CARBON by testers.ai

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Introduction

CARBON, powered by testers.ai, is an AI testing harness that runs inside your coding agent. The official site introduces “Jay”, an AI test manager agent that coordinates 12 free testing commands, from risk-based checks and exploratory testing to accessibility investigations, reproducible findings and evidence-backed confidence.

The Core edition is described as free and open source under MIT. It works alongside your existing frameworks (Selenium, Playwright, pytest, Appium and others) and connects to issue trackers and test management tools. A Pro tier adds 48 more workflows.

Features

1. 12 core commands: Risk-based testing, exploratory checks, accessibility, evidence and reports.
2. Lives in your agent: Install as a plugin or local MCP server in Claude Code, Codex, Cursor or Antigravity.
3. MCP package: npx -y @testers-ai/carbon-mcp in your MCP configuration; Node.js 22+ required.
4. Framework agnostic: Works with Selenium, Playwright, pytest, Appium and Vibium.
5. Issue and TCM links: Jira, GitHub Issues, GitLab Issues, TestRail and Xray are listed.
6. Languages: Java, Python, TypeScript, JavaScript and C#.
7. Pro workflows: Pro adds 48 workflows and support.

Pros

1. Free core: MIT-licensed core at no cost.
2. Uses your agent’s tools: No separate platform to learn.
3. Testing discipline: Brings risk-based and exploratory thinking to agent workflows.
4. Accessibility built in: Accessibility investigation is a core command.
5. Low price for Pro: $49 a month at review time.

Cons

1. Depends on your coding agent: Quality depends on the agent and model you use.
2. MCP lacks slash commands: The site notes MCP does not add the native plugin’s slash commands.
3. Young product: Limited public track record.
4. No hosted execution: You provide browsers, devices and frameworks.
5. Pro details on separate pages: Check the site for exactly what Pro includes.

Usage and Links (Example)

Add CARBON as a local MCP server, for example in Cursor:

{ "mcpServers": { "carbon": { "command": "npx", "args": ["-y", "@testers-ai/carbon-mcp"] } } }

Reconnect and confirm the tools appear, then ask Jay to run a risk-based check or an exploratory session on your app. In Claude Code, install it from the plugin menu as described on the site.

Resources:

• testers.ai website

Pricing

From testers.ai: Core is free and open source (MIT) with 12 commands. Pro is listed at $49 a month with 48 more workflows and support. Confirm on the site.

Recommended for?

1. Developers using coding agents who want structured testing habits inside the agent.
2. QA engineers adding exploratory and accessibility checks to existing suites.
3. Teams on a budget that want a free, MIT-licensed starting point.
4. Not a fit if you need a hosted test cloud and dashboards.

Conclusion

CARBON brings test-management thinking into coding agents with a free MIT core and an inexpensive Pro tier.

It is only as strong as the agent and tools around it, so pair it with real frameworks and keep humans reviewing findings.