Salesforce MCP Server

Instructions

Implementation Reference

• src/tools/writeApex.ts:70-179 (handler)

  The `handleWriteApex` function implements the core logic for creating or updating Apex classes in Salesforce using the Tooling API. It validates inputs, checks for existing classes, performs CRUD operations, and returns formatted success or error responses.
  export async function handleWriteApex(conn: any, args: WriteApexArgs) { try { // Validate inputs if (!args.className) { throw new Error('className is required'); } if (!args.body) { throw new Error('body is required'); } // Check if the class name in the body matches the provided className const classNameRegex = new RegExp(`\\b(class|interface|enum)\\s+${args.className}\\b`); if (!classNameRegex.test(args.body)) { throw new Error(`The class name in the body must match the provided className: ${args.className}`); } // Handle create operation if (args.operation === 'create') { console.error(`Creating new Apex class: ${args.className}`); // Check if class already exists const existingClass = await conn.query(` SELECT Id FROM ApexClass WHERE Name = '${args.className}' `); if (existingClass.records.length > 0) { throw new Error(`Apex class with name '${args.className}' already exists. Use 'update' operation instead.`); } // Create the new class using the Tooling API const createResult = await conn.tooling.sobject('ApexClass').create({ Name: args.className, Body: args.body, ApiVersion: args.apiVersion || '58.0', // Default to latest if not specified Status: 'Active' }); if (!createResult.success) { throw new Error(`Failed to create Apex class: ${createResult.errors.join(', ')}`); } return { content: [{ type: "text", text: `Successfully created Apex class: ${args.className}\n\n` + `**ID:** ${createResult.id}\n` + `**API Version:** ${args.apiVersion || '58.0'}\n` + `**Status:** Active` }] }; } // Handle update operation else if (args.operation === 'update') { console.error(`Updating Apex class: ${args.className}`); // Find the existing class const existingClass = await conn.query(` SELECT Id FROM ApexClass WHERE Name = '${args.className}' `); if (existingClass.records.length === 0) { throw new Error(`No Apex class found with name: ${args.className}. Use 'create' operation instead.`); } const classId = existingClass.records[0].Id; // Update the class using the Tooling API const updateResult = await conn.tooling.sobject('ApexClass').update({ Id: classId, Body: args.body }); if (!updateResult.success) { throw new Error(`Failed to update Apex class: ${updateResult.errors.join(', ')}`); } // Get the updated class details const updatedClass = await conn.query(` SELECT Id, Name, ApiVersion, Status, LastModifiedDate FROM ApexClass WHERE Id = '${classId}' `); const classDetails = updatedClass.records[0]; return { content: [{ type: "text", text: `Successfully updated Apex class: ${args.className}\n\n` + `**ID:** ${classId}\n` + `**API Version:** ${classDetails.ApiVersion}\n` + `**Status:** ${classDetails.Status}\n` + `**Last Modified:** ${new Date(classDetails.LastModifiedDate).toLocaleString()}` }] }; } else { throw new Error(`Invalid operation: ${args.operation}. Must be 'create' or 'update'.`); } } catch (error) { console.error('Error writing Apex class:', error); return { content: [{ type: "text", text: `Error writing Apex class: ${error instanceof Error ? error.message : String(error)}` }], isError: true, }; } }
• src/tools/writeApex.ts:4-55 (schema)

  The `WRITE_APEX` Tool object defines the name, description, and input schema (including properties like operation, className, apiVersion, body) for the salesforce_write_apex tool.
  export const WRITE_APEX: Tool = { name: "salesforce_write_apex", description: `Create or update Apex classes in Salesforce. Examples: 1. Create a new Apex class: { "operation": "create", "className": "AccountService", "apiVersion": "58.0", "body": "public class AccountService { public static void updateAccounts() { /* implementation */ } }" } 2. Update an existing Apex class: { "operation": "update", "className": "AccountService", "body": "public class AccountService { public static void updateAccounts() { /* updated implementation */ } }" } Notes: - The operation must be either 'create' or 'update' - For 'create' operations, className and body are required - For 'update' operations, className and body are required - apiVersion is optional for 'create' (defaults to the latest version) - The body must be valid Apex code - The className in the body must match the className parameter - Status information is returned after successful operations`, inputSchema: { type: "object", properties: { operation: { type: "string", enum: ["create", "update"], description: "Whether to create a new class or update an existing one" }, className: { type: "string", description: "Name of the Apex class to create or update" }, apiVersion: { type: "string", description: "API version for the Apex class (e.g., '58.0')" }, body: { type: "string", description: "Full body of the Apex class" } }, required: ["operation", "className", "body"] } };
• src/index.ts:240-255 (registration)

  In the main tool dispatch switch statement, this case handles calls to 'salesforce_write_apex' by validating arguments and delegating to the `handleWriteApex` function.
  case "salesforce_write_apex": { const apexArgs = args as Record<string, unknown>; if (!apexArgs.operation || !apexArgs.className || !apexArgs.body) { throw new Error('operation, className, and body are required for writing Apex'); } // Type check and conversion const validatedArgs: WriteApexArgs = { operation: apexArgs.operation as 'create' | 'update', className: apexArgs.className as string, apiVersion: apexArgs.apiVersion as string | undefined, body: apexArgs.body as string }; return await handleWriteApex(conn, validatedArgs); }
• src/index.ts:22-22 (registration)

  Import statement bringing in the WRITE_APEX tool definition, handler function, and type from writeApex.ts.
  import { WRITE_APEX, handleWriteApex, WriteApexArgs } from "./tools/writeApex.js";
• src/index.ts:57-57 (registration)

  The WRITE_APEX tool is included in the list of available tools returned by ListToolsRequest.
  WRITE_APEX,