CrossCheck

AI code review for Claude Code: security, accessibility and performance

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Pricing: Freeto use
Category: Developer toolsPlugins
Version: 2.1.09 Nov 2026
Languages: 1English

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Install CrossCheck

Inside Claude Code2 commands, in order

>/plugin marketplace add https://vayleer.com/plugins/marketplace.json>/plugin install crosscheck@vayleer

Run both commands inside Claude Code. The first adds the Vayleer marketplace once; after that every plugin here installs with one command.

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About CrossCheck

CrossCheck is an AI code review plugin for Claude Code. It works out what changed, runs the reviewers that apply in parallel (security, correctness, performance, accessibility, and data and migrations), and checks new dependencies against the OSV vulnerability database and their registry.

Claude confirms every finding against the code before reporting it, and can prove critical findings with a failing test in your own test framework. Findings you dismiss are remembered with a reason. You get one short list of real problems, each with a severity, the file and line, and a fix.

Five specialistsSecurity, correctness, performance, accessibility and data.
Dependency checkKnown vulnerabilities, deprecations and typosquats in new packages.
Proved findingsA failing test for each critical finding, on request.
Confirmed, not guessedEvery finding checked against the code.
Remembers dismissalsFindings you rule out do not come back.
Measured contrastColor checks by HueProof, light and dark.
Migration safetyLocks, data loss and deploy-order breaks.
Your choice of fixesNothing changes until you pick.

Works with

Claude Code

Integrations

Claude CodeHueProof MCP server

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Questions

Does it change my code?

Not until you choose. The reviewers are read-only.

Why confirm findings again?

Reviewers can be wrong. Claude reads the code at each cited line and drops anything it cannot confirm.

What does HueProof receive?

Only color values to measure, never your code.

Is CrossCheck free?

Yes. CrossCheck is free and MIT licensed.

How do I install CrossCheck?

In Claude Code run /plugin marketplace add https://plugins.dudelemon.cloud/marketplace.json, then /plugin install crosscheck@dudelemon.

What’s new

2.1.0
9 Nov 2026
- Proofs with failing tests, and remembered dismissals.
2.0.0
9 Nov 2026
- Correctness and data reviewers, scope detection and dependency checks.
1.0.0
8 Nov 2026
- CrossCheck is available as a free Claude Code plugin.

Install CrossCheck

About CrossCheck

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