MCPInstall

biome-validator

by gracefullightBusiness & Finance

Validate Biome 2.3+ configuration and detect outdated patterns. Ensures proper schema version, domains, assists, and recommended rules. Use before any linting work or when auditing existing projects.

Installs
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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/gracefullight/stock-checker --skill biome-validator
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads biome-validator automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Biome Validator

Validates Biome 2.3+ configuration and prevents outdated patterns. Ensures type-aware linting, domains, and modern Biome features are properly configured.

When This Activates

  • Setting up linting for a new project
  • Before any code quality work
  • Auditing existing Biome configurations
  • After AI generates biome.json
  • CI/CD pipeline validation

Quick Start

python3 ~/.claude/skills/biome-validator/scripts/validate.py --root .
python3 ~/.claude/skills/biome-validator/scripts/validate.py --root . --strict

What Gets Checked

1. Biome Version & Schema

GOOD - Biome 2.3+:

{
  "$schema": "https://biomejs.dev/schemas/2.3.11/schema.json"
}

BAD - Old schema:

{
  "$schema": "https://biomejs.dev/schemas/1.9.0/schema.json"
}

2. Package Version

// GOOD: v2.3+
"@biomejs/biome": "^2.3.0"

// BAD: v1.x or v2.0-2.2
"@biomejs/biome": "^1.9.0"

3. Linter Configuration

GOOD - Biome 2.x:

{
  "linter": {
    "enabled": true,
    "rules": {
      "recommended": true,
      "suspicious": {
        "noExplicitAny": "warn"
      }
    }
  }
}

4. Biome Assist (2.0+)

GOOD - Using assist:

{
  "assist": {
    "actions": {
      "source": {
        "organizeImports": "on"
      }
    }
  }
}

BAD - Old organizeImports location:

{
  "organizeImports": {
    "enabled": true
  }
}

5. Domains (2.0+)

GOOD - Using domains for framework-specific rules:

{
  "linter": {
    "domains": {
      "react": "on",
      "next": "on"
    }
  }
}

6. Suppression Comments

GOOD - Biome 2.0+ comments:

// biome-ignore lint/suspicious/noExplicitAny: legacy code
// biome-ignore-all lint/style/useConst
// biome-ignore-start lint/complexity
// biome-ignore-end

BAD - Wrong format:

// @ts-ignore  // Not Biome
// eslint-disable  // Wrong tool

Biome 2.3+ Features

Type-Aware Linting

Biome 2.0+ includes type inference without requiring TypeScript compiler:

{
  "linter": {
    "rules": {
      "correctness": {
        "noUndeclaredVariables": "error",
        "useAwaitThenable": "error"
      }
    }
  }
}

Assist Actions

{
  "assist": {
    "actions": {
      "source": {
        "organizeImports": "on",
        "useSortedKeys": "on"
      }
    }
  }
}

Multi-file Analysis

Lint rules can query information from other files for more powerful analysis.

Framework Domains

{
  "linter": {
    "domains": {
      "react": "on",       // React-specific rules
      "next": "on",        // Next.js rules
      "test": "on"         // Testing framework rules
    }
  }
}

Recommended Configuration

{
  "$schema": "https://biomejs.dev/schemas/2.3.11/schema.json",
  "assist": {
    "actions": {
      "source": {
        "organizeImports": "on"
      }
    }
  },
  "linter": {
    "enabled": true,
    "rules": {
      "recommended": true,
      "complexity": {
        "noForEach": "off"
      },
      "style": {
        "noNonNullAssertion": "off"
      },
      "suspicious": {
        "noArrayIndexKey": "off",
        "noExplicitAny": "warn"
      },
      "correctness": {
        "useAwaitThenable": "error",
        "noLeakedRender": "error"
      }
    },
    "domains": {
      "react": "on",
      "next": "on"
    }
  },
  "formatter": {
    "enabled": true,
    "indentStyle": "space",
    "indentWidth": 2,
    "lineWidth": 100
  },
  "javascript": {
    "formatter": {
      "quoteStyle": "single",
      "trailingCommas": "es5",
      "semicolons": "always"
    }
  },
  "files": {
    "ignore": [
      "node_modules",
      "dist",
      "build",
      ".next",
      "out",
      ".cache",
      ".turbo",
      "coverage"
    ]
  }
}

Deprecated Patterns

DeprecatedReplacement (2.3+)
organizeImports.enabledassist.actions.source.organizeImports
Schema < 2.0Schema 2.3.11+
@biomejs/biome < 2.3@biomejs/biome@latest
No domains configUse linter.domains for frameworks

Validation Output

=== Biome 2.3+ Validation Report ===

Package Version: @biomejs/biome@2.3.11 ✓

Configuration:
  ✓ Schema version: 2.3.11
  ✓ Linter enabled with recommended rules
  ✓ Using assist.actions for imports
  ✗ No domains configured (consider enabling react, next)
  ✓ Formatter configured

Rules:
  ✓ noExplicitAny: warn
  ✓ useAwaitThenable: error
  ✗ noLeakedRender not enabled (recommended)

Summary: 2 issues found

Migration from ESLint

Step 1: Install Biome

bun remove eslint prettier eslint-config-* eslint-plugin-*
bun add -D @biomejs/biome@latest

Step 2: Create biome.json

bunx biome init

Step 3: Migrate rules

bunx biome migrate eslint --write

Step 4: Update scripts

{
  "scripts": {
    "lint": "biome lint .",
    "lint:fix": "biome lint --write .",
    "format": "biome format --write .",
    "check": "biome check .",
    "check:fix": "biome check --write ."
  }
}

Step 5: Remove old configs

rm .eslintrc* .prettierrc* .eslintignore .prettierignore

VS Code Integration

// .vscode/settings.json
{
  "editor.formatOnSave": true,
  "editor.defaultFormatter": "biomejs.biome",
  "editor.codeActionsOnSave": {
    "source.organizeImports.biome": "explicit",
    "quickfix.biome": "explicit"
  }
}

CI/CD Integration

# .github/workflows/lint.yml
- name: Validate Biome Config
  run: |
    python3 ~/.claude/skills/biome-validator/scripts/validate.py \
      --root . \
      --strict \
      --ci

- name: Lint
  run: bunx biome check --error-on-warnings .

Integration

  • linter-formatter-init - Sets up Biome from scratch
  • nextjs-validator - Validates Next.js (enable next domain)
  • bun-validator - Validates Bun workspace

FAQ

What does the biome-validator skill do?

Validate Biome 2.3+ configuration and detect outdated patterns. Ensures proper schema version, domains, assists, and recommended rules. Use before any linting work or when auditing existing projects.

How do I install biome-validator?

Run npx skills add https://github.com/gracefullight/stock-checker --skill biome-validator in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/biome-validator/ (personal) or .claude/skills/biome-validator/ (project).

Which AI agents can use biome-validator?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is biome-validator safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains biome-validator?

It is published by gracefullight in gracefullight/stock-checker. It has 124 recorded installs.

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