format_code
Format code to follow language-specific style guides by specifying programming language and indentation preferences for consistent, readable code.
Instructions
Provides formatted version of code following language-specific style guides.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| code | Yes | The code to format | |
| language | Yes | Programming language | |
| indent | No | Indentation size (default: 2 for JS, 4 for Python) |
Implementation Reference
- src/tools/linting.ts:163-207 (handler)The formatCodeHandler function implements the core logic of the 'format_code' tool. It performs basic code formatting (tab to spaces, remove trailing whitespace) and generates a markdown report with formatting analysis, suggestions, and style guide references based on the input language.
export function formatCodeHandler(args: any) { const { code, language, indent } = args; const defaultIndent = language === "python" ? 4 : 2; const indentSize = indent || defaultIndent; const indentStr = " ".repeat(indentSize); let formatted = code; const suggestions: string[] = []; // Basic formatting formatted = formatted.replace(/\t/g, indentStr); formatted = formatted.replace(/[ \t]+$/gm, ""); // Remove trailing whitespace // Language-specific suggestions if (language === "javascript" || language === "typescript") { if (!formatted.endsWith("\n")) { suggestions.push("Add newline at end of file"); } if (formatted.includes("{ }")) { suggestions.push("Empty blocks should be on separate lines"); } } if (language === "python") { if (formatted.includes(" #")) { suggestions.push("Add two spaces before inline comments"); } } const result = `# Format Analysis: ${language} ## Formatting Applied - Converted tabs to ${indentSize} spaces - Removed trailing whitespace - Normalized line endings ## Additional Suggestions ${suggestions.length > 0 ? suggestions.map(s => `- ${s}`).join("\n") : "✅ Code follows formatting guidelines"} ## Style Guide Reference - ${language === "python" ? "PEP 8" : language === "javascript" || language === "typescript" ? "Prettier/ESLint" : "Standard conventions"} `; return { content: [{ type: "text", text: result }] }; } - src/tools/linting.ts:153-161 (schema)Zod schema definition for the 'format_code' tool, specifying input parameters: code (string), language (string), and optional indent (number).
export const formatCodeSchema = { name: "format_code", description: "Provides formatted version of code following language-specific style guides.", inputSchema: z.object({ code: z.string().describe("The code to format"), language: z.string().describe("Programming language"), indent: z.number().optional().describe("Indentation size (default: 2 for JS, 4 for Python)") }) }; - src/index.ts:105-105 (registration)Registration of the 'format_code' tool in the main toolRegistry Map used by the stdio MCP server.
["format_code", { schema: formatCodeSchema, handler: formatCodeHandler }], - src/server.ts:105-105 (registration)Registration of the 'format_code' tool in the toolRegistry Map used by the HTTP MCP server.
["format_code", { schema: formatCodeSchema, handler: formatCodeHandler }],