CARBON Free documentation
Your agent’s plan. Your local workspace.
In Claude Code, Codex, and other coding agents, default CARBON tests use your agent’s configured model access. Signed in with an eligible subscription? CARBON uses that allowance. Using API credentials? API billing applies.
Local storage ≠ local-only AI. Local runs keep files, evidence, and reports in your workspace. Your coding agent may send code, screenshots, and other context to its model provider.
Billing, privacy & MCP details
Plan limits and extra-usage charges still apply. CARBON Pro licensing and CARBON Cloud are separate. Optional direct-model checks and external integrations can have separate costs and data flows. Command-usage analytics vary by edition—review its privacy policy and settings. Local does not mean offline or air-gapped.
Check /status in Claude Code or codex login status in Codex to confirm your billing route. A configured API key can select API billing instead of subscription usage. A standalone MCP client supplies the model access and execution tools; the MCP server does not include a subscription.
Provider documentation: Claude Code billing · Codex sign-in and billing.
Different perspectives. One harness.
Jay’s AI testing team
AI-generated testing perspectives, not human reviewers. Select a profile to explore its focus.
AIAI QA sub-agent
Jay
AI test manager
Modeled on Jason Arbon’s approach to testing: start with the customer’s intent, follow the consequential risks, challenge the evidence, and make the next useful action clear. Jay is an AI persona inspired by Jason Arbon, not Jason himself. His visual identity is a distinctive J-shaped character, not a human portrait.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
AIAI QA sub-agent
Security sub-agent
Security sub-agent
Web-application security specialist focused on authentication, authorization, session safety, exposed data, dependencies, and practical vulnerability evidence.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
AIAI QA sub-agent
OWASP sub-agent
OWASP sub-agent
OWASP-focused security specialist who challenges access control, injection, insecure design, misconfiguration, vulnerable components, integrity, logging, and SSRF risks.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
AIAI QA sub-agent
Accessibility sub-agent
Accessibility sub-agent
Accessibility specialist focused on keyboard use, assistive technology, inclusive interactions, responsive access, labels, feedback, and barriers affecting disabled users.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
AIAI QA sub-agent
WCAG sub-agent
WCAG sub-agent
WCAG specialist focused on criterion-level evidence across perceivable, operable, understandable, and robust behavior, without overstating automated scan results as conformance.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
AIAI QA sub-agent
Usability sub-agent
Usability sub-agent
User-centered design and usability specialist focused on discoverability, task clarity, responsive behavior, interaction friction, visual hierarchy, and inclusive UX.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
AIAI QA sub-agent
Compatibility sub-agent
Compatibility sub-agent
Compatibility specialist focused on browser, device, viewport, operating-system, assistive-technology, and support-matrix evidence, with explicit coverage gaps rather than assumed portability.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
AIAI QA sub-agent
Performance sub-agent
Performance sub-agent
Performance specialist focused on user-visible latency, Core Web Vitals, payload and request cost, caching, API timing, scalability, mobile constraints, memory, and leaks.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
AIAI QA sub-agent
Content sub-agent
Content sub-agent
Content and UX-writing specialist focused on page identity, clear copy, information architecture, credibility, navigation, status communication, readability, and content quality.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
AIAI QA sub-agent
Localization sub-agent
Localization sub-agent
Localization specialist focused on translation accuracy, locale formats, pluralization, truncation, bidirectional layout, cultural fit, regulatory copy, and recovery behavior across languages.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
AIAI QA sub-agent
Data integrity sub-agent
Data integrity sub-agent
Data-integrity specialist focused on agreement between rendered values, APIs, events, schemas, exports, storage, calculations, retention, and downstream state.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
AIAI QA sub-agent
Forms sub-agent
Forms sub-agent
Forms specialist focused on input contracts, validation, boundaries, state, submission, recovery, data quality, conversion barriers, and accessible interaction.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
AIAI QA sub-agent
Error UX sub-agent
Error UX sub-agent
Error and recovery specialist focused on truthful status, clear messages, consistent severity, actionable recovery, safe logs, failure loops, and user trust.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
AIAI QA sub-agent
Search sub-agent
Search sub-agent
Search-interface specialist focused on discoverability, query handling, suggestions, empty states, input accessibility, relevance feedback, and resilient result navigation.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
AIAI QA sub-agent
News & content sub-agent
News & content sub-agent
Digital publishing specialist focused on article identity, readability, supporting media, metadata, context, advertising boundaries, and multi-device content behavior.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
AIAI QA sub-agent
Landing pages sub-agent
Landing pages sub-agent
First-impression and conversion specialist focused on value clarity, trust, navigation, calls to action, responsive composition, dead ends, and page credibility.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
AIAI QA sub-agent
Checkout sub-agent
Checkout sub-agent
Checkout and payment specialist focused on order accuracy, address and payment input, trust, retry safety, pricing truth, completion, and conversion-blocking failures.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
AIAI QA sub-agent
Shopping cart sub-agent
Shopping cart sub-agent
Shopping-cart specialist focused on line-item state, quantities, promotions, totals, inventory changes, persistence, accessibility, and safe transition to checkout.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
AIAI QA sub-agent
Pricing sub-agent
Pricing sub-agent
Pricing and subscription specialist focused on plan clarity, comparison, currency and locale, hidden conditions, billing cadence, conversion paths, and truthful claims.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
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AIAI QA sub-agent
Privacy sub-agent
Privacy sub-agent
Privacy specialist focused on personal-data exposure, consent, tracking, collection minimization, storage and transfer, debug leakage, user expectations, and AI-specific privacy risks.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
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AIAI QA sub-agent
GDPR sub-agent
GDPR sub-agent
GDPR specialist focused on lawful consent, personal-data exposure, international transfer, minimization, retention, security, data-subject rights, transparency, and accountability.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
AIAI QA sub-agent
Cookie consent sub-agent
Cookie consent sub-agent
Cookie-consent specialist focused on prior consent, purpose and vendor choices, reject symmetry, preference persistence, withdrawal, tracking verification, and regional behavior.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
AIAI QA sub-agent
Legal policy sub-agent
Legal policy sub-agent
Policy-content specialist focused on discoverability, internal consistency, versioning, contact details, user rights, actual-product alignment, accessibility, and credible presentation.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
AIAI QA sub-agent
AI-generated code sub-agent
AI-generated code sub-agent
AI-generated-code specialist focused on logic, boundaries, null and empty states, failure handling, API use, security, privacy, tests, code smells, state, and misleading AI shortcuts.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
AIAI QA sub-agent
AI chatbot sub-agent
AI chatbot sub-agent
Conversational-AI specialist focused on task success, conversation quality, state, memory, recovery, privacy, safety, injection, tools, latency, integration, and nondeterminism.
A perspective available to CARBON—not a claim that this tester has reviewed your project. Findings require execution evidence.
Explore related commands
CARBON FREE · INCLUDED IN YOUR DOWNLOAD
Free is a bounded assessment, not a continuous test-fix loop. It includes every recorded finding, current-assessment reports and portable HTML/JSON exports. Your coding agent executes the checks; CARBON records the evidence.
Start here
Install CARBON Light from Claude’s plugin directory:
- Cowork: open Claude Desktop → Cowork → Customize → Plugins → Discover.
- Claude Code: run
/pluginand open Discover.
Search for CARBON, select the Light listing from testers.ai, then Add / Install and enable it.
Start testing
Start a new Cowork task or Claude Code session, then run:
/carbon:carbonThis is /carbon with Claude’s plugin prefix. CARBON tests your current project when the target is clear. Otherwise, it asks what to test: share a URL, folder, repository, API, app, feature, or requirements. It runs a broad assessment within your testing budget and shows findings, evidence-qualified confidence, coverage gaps, and prioritized next steps. If the command is missing, check that CARBON is enabled, reload or start a new session, and look for it in the slash-command picker.
Talk to Jay
In builds with the Jay entrypoints, use /carbon:jay or /carbon:j in Claude to talk directly to Jay, your AI Test Manager Agent. Other hosts may show /jay, /j, or a plugin-prefixed skill. Ask a question, review results, or tell him what to test. He replies in a frank, practical voice inspired by Jason Arbon. He is an AI persona, not Jason. Questions do not automatically start tests. If these commands are absent, update the plugin or use /carbon:carbon.
For your own project, run /carbon:carbon. Other coding agents, requirements and troubleshooting.
Your eight Free commands
/carbon-issues
Hunt bugs with stateful multi-step journeys and persona exploration, not just a static checklist.
/carbon-help
Explain Free commands, inspect scope when requested, and suggest the smallest useful next assessment.
/carbon-demo
Create a disposable demo project, optionally with existing tests, and perform a first CARBON assessment.
/carbon-settings
Read or change project testing defaults and analytics preferences in a protected local settings page.
/carbon-map
Open a screenshot-based map of one saved Free assessment, its checks and findings. Not a cross-build planning workspace.
/carbon
Run a bounded risk-based assessment of a project or URL, including business value, stateful checks, persona exploration and an evidence-qualified report.
/carbon-test
Test one named feature, flow, API or behavior with reproducible steps and evidence.
/carbon-accessibility
Investigate accessibility using source, keyboard, zoom, visual and dynamic browser evidence.
Reports, maps and settings
- Reports include all recorded findings, executed checks, blockers, persona evidence and scope-qualified confidence.
- Free Map shows screenshots and findings from one saved assessment. It does not compare builds or retain steering.
- HTML/JSON exports remain usable after the local live-report process stops. Review them before sharing.
- Settings: time budget, check count, focus and analytics preference. No credential or team-integration management.
What is different in Pro?
Pro adds continuous discovery, dedicated specialist workflows, test engineering, persistent maps, team integrations and Pro-only peer benchmark comparisons where a matching category is available. Benchmark access requires approval to send the public target URL; comparisons are not confidence scores. It is a separate private package, not a hidden unlock inside Free. Access is by agreement; model/API costs are separate.
Security, privacy and performance risks can still be checked in Free. The dedicated specialist commands and advanced workflows are Pro.
See Pro capabilities · Free package README · Privacy
The six Free MCP tools
carbon_start, carbon_update, carbon_report, carbon_settings, carbon_demo and carbon_knowledge. These record and present evidence; the coding agent supplies execution. The downloaded package includes a Free-only MCP_SERVER.md with setup and tool contracts.
Share with your team
A ready-to-present, 11-slide introduction for developers, testers and team leaders. Covers how CARBON works, the AI sub-agents, example commands, and optional expert testing support from Iceberg QA. Includes speaker notes and a presenter guide.
Iceberg QA services and training version
An alternative presentation led by Iceberg QA’s human expertise, with CARBON as the supporting toolkit.