Salesforce MCP Server

Instructions

Implementation Reference

• src/tools/query.ts:122-196 (handler)

  Main handler function that executes the tool: validates input fields, builds SOQL query supporting relationships, executes via Salesforce connection, formats results with relationship handling, and provides enhanced error messages.
  export async function handleQueryRecords(conn: any, args: QueryArgs) { const { objectName, fields, whereClause, orderBy, limit } = args; try { // Validate relationship field syntax const validation = validateRelationshipFields(fields); if (!validation.isValid) { return { content: [{ type: "text", text: validation.error! }], isError: true, }; } // Construct SOQL query let soql = `SELECT ${fields.join(', ')} FROM ${objectName}`; if (whereClause) soql += ` WHERE ${whereClause}`; if (orderBy) soql += ` ORDER BY ${orderBy}`; if (limit) soql += ` LIMIT ${limit}`; const result = await conn.query(soql); // Format the output const formattedRecords = result.records.map((record: any, index: number) => { const recordStr = fields.map(field => { // Handle special case for subqueries (child relationships) if (field.startsWith('(SELECT')) { const relationshipName = field.match(/FROM\s+(\w+)/)?.[1]; if (!relationshipName) return ` ${field}: Invalid subquery format`; const childRecords = record[relationshipName]; return ` ${relationshipName}: [${childRecords?.length || 0} records]`; } return ' ' + formatRelationshipResults(record, field); }).join('\n'); return `Record ${index + 1}:\n${recordStr}`; }).join('\n\n'); return { content: [{ type: "text", text: `Query returned ${result.records.length} records:\n\n${formattedRecords}` }], isError: false, }; } catch (error) { // Enhanced error handling for relationship queries const errorMessage = error instanceof Error ? error.message : String(error); let enhancedError = errorMessage; if (errorMessage.includes('INVALID_FIELD')) { // Try to identify which relationship field caused the error const fieldMatch = errorMessage.match(/(?:No such column |Invalid field: )['"]?([^'")\s]+)/); if (fieldMatch) { const invalidField = fieldMatch[1]; if (invalidField.includes('.')) { enhancedError = `Invalid relationship field "${invalidField}". Please check:\n` + `1. The relationship name is correct\n` + `2. The field exists on the related object\n` + `3. You have access to the field\n` + `4. For custom relationships, ensure you're using '__r' suffix`; } } } return { content: [{ type: "text", text: `Error executing query: ${enhancedError}` }], isError: true, }; } }
• src/tools/query.ts:3-59 (schema)

  Tool schema definition for salesforce_query_records, including detailed description, input schema with support for SOQL relationships, where, orderBy, limit.
  export const QUERY_RECORDS: Tool = { name: "salesforce_query_records", description: `Query records from any Salesforce object using SOQL, including relationship queries. Examples: 1. Parent-to-child query (e.g., Account with Contacts): - objectName: "Account" - fields: ["Name", "(SELECT Id, FirstName, LastName FROM Contacts)"] 2. Child-to-parent query (e.g., Contact with Account details): - objectName: "Contact" - fields: ["FirstName", "LastName", "Account.Name", "Account.Industry"] 3. Multiple level query (e.g., Contact -> Account -> Owner): - objectName: "Contact" - fields: ["Name", "Account.Name", "Account.Owner.Name"] 4. Related object filtering: - objectName: "Contact" - fields: ["Name", "Account.Name"] - whereClause: "Account.Industry = 'Technology'" Note: When using relationship fields: - Use dot notation for parent relationships (e.g., "Account.Name") - Use subqueries in parentheses for child relationships (e.g., "(SELECT Id FROM Contacts)") - Custom relationship fields end in "__r" (e.g., "CustomObject__r.Name")`, inputSchema: { type: "object", properties: { objectName: { type: "string", description: "API name of the object to query" }, fields: { type: "array", items: { type: "string" }, description: "List of fields to retrieve, including relationship fields" }, whereClause: { type: "string", description: "WHERE clause, can include conditions on related objects", optional: true }, orderBy: { type: "string", description: "ORDER BY clause, can include fields from related objects", optional: true }, limit: { type: "number", description: "Maximum number of records to return", optional: true } }, required: ["objectName", "fields"] } };
• src/index.ts:37-47 (registration)

  Registration of the salesforce_query_records tool (as QUERY_RECORDS) in the MCP server's list of available tools.
  tools: [ SEARCH_OBJECTS, DESCRIBE_OBJECT, QUERY_RECORDS, DML_RECORDS, MANAGE_OBJECT, MANAGE_FIELD, SEARCH_ALL, UPLOAD_REPORT_XML // Add new tool to the list ], }));
• src/index.ts:69-83 (handler)

  Dispatch handler in main server: validates arguments, converts types, and calls the main handleQueryRecords function.
  case "salesforce_query_records": { const queryArgs = args as Record<string, unknown>; if (!queryArgs.objectName || !Array.isArray(queryArgs.fields)) { throw new Error('objectName and fields array are required for query'); } // Type check and conversion const validatedArgs: QueryArgs = { objectName: queryArgs.objectName as string, fields: queryArgs.fields as string[], whereClause: queryArgs.whereClause as string | undefined, orderBy: queryArgs.orderBy as string | undefined, limit: queryArgs.limit as number | undefined }; return await handleQueryRecords(conn, validatedArgs); }
• src/tools/query.ts:70-101 (helper)

  Helper function to validate SOQL relationship field syntax, checking dot notation, depth limits, and subquery format.
  function validateRelationshipFields(fields: string[]): { isValid: boolean; error?: string } { for (const field of fields) { // Check for parent relationship syntax (dot notation) if (field.includes('.')) { const parts = field.split('.'); // Check for empty parts if (parts.some(part => !part)) { return { isValid: false, error: `Invalid relationship field format: "${field}". Relationship fields should use proper dot notation (e.g., "Account.Name")` }; } // Check for too many levels (Salesforce typically limits to 5) if (parts.length > 5) { return { isValid: false, error: `Relationship field "${field}" exceeds maximum depth of 5 levels` }; } } // Check for child relationship syntax (subqueries) if (field.includes('SELECT') && !field.match(/^\(SELECT.*FROM.*\)$/)) { return { isValid: false, error: `Invalid subquery format: "${field}". Child relationship queries should be wrapped in parentheses` }; } } return { isValid: true }; }