fix(ai): improve mcp metadata logic (#13991)

Fix #13801

packages/twenty-server/src/engine/core-modules/ai/constants/mcp.const.ts

@@ -1,6 +1,6 @@
 export const MCP_SERVER_METADATA = {
   metadata: {
-    info: '📦 Objects structure your business entities in Twenty. **Standard Objects** (e.g. People, Companies, Opportunities) are built‑in, pre‑configured data models. **Custom Objects** let you define entities specific to your needs (like Rockets, Properties, etc.). **Fields** work like spreadsheet columns and can be standard or custom. Always use the `fields` and `objects` parameters to select only the data you need—this **strongly reduces response size and token usage**, improving performance.',
+    info: 'Objects structure your business entities in Twenty. **Standard Objects** (e.g. People, Companies, Opportunities) are built‑in, pre‑configured data models. **Custom Objects** let you define entities specific to your needs (like Rockets, Properties, etc.). **Fields** work like spreadsheet columns and can be standard or custom. Always use the `fields` and `objects` parameters to select only the data you need—this **strongly reduces response size and token usage**, improving performance.',
   },
   protocolVersion: '2024-11-05',
   serverInfo: {

packages/twenty-server/src/engine/core-modules/ai/dtos/json-rpc.ts

@@ -27,5 +27,5 @@ export class JsonRpc {
 
   @IsOptional()
   @Validate(IsNumberOrString)
-  id: string | number | null;
+  id: string | number;
 }

packages/twenty-server/src/engine/core-modules/ai/services/mcp.service.ts

@@ -39,7 +39,7 @@ export class McpService {
     }
   }
 
-  handleInitialize(requestId: string | number | null) {
+  handleInitialize(requestId: string | number) {
     return wrapJsonRpcResponse(requestId, {
       result: {
         capabilities: {
@@ -129,7 +129,7 @@ export class McpService {
   }
 
   private async handleToolCall(
-    id: string | number | null,
+    id: string | number,
     toolSet: ToolSet,
     params: Record<string, unknown>,
   ) {
@@ -161,7 +161,7 @@ export class McpService {
     );
   }
 
-  private handleToolsListing(id: string | number | null, toolSet: ToolSet) {
+  private handleToolsListing(id: string | number, toolSet: ToolSet) {
     const toolsArray = Object.entries(toolSet)
       .filter(([, def]) => !!def.parameters.jsonSchema)
       .map(([name, def]) => ({

packages/twenty-server/src/engine/core-modules/ai/utils/wrap-jsonrpc-response.util.ts

@@ -1,7 +1,7 @@
 import { MCP_SERVER_METADATA } from 'src/engine/core-modules/ai/constants/mcp.const';
 
 export const wrapJsonRpcResponse = (
-  id: string | number | null | undefined = null,
+  id: string | number,
   payload:
     | Record<'result', Record<string, unknown>>
     | Record<'error', Record<string, unknown>>,