fix: custom alphabet (#482)

* custom alphabet

* fix test

Author: miles-kt-inkeep

packages/agents-core/src/__tests__/utils/conversations.test.ts

@@ -66,7 +66,7 @@ describe('getConversationId', () => {
     it('should only contain URL-safe characters', () => {
       // nanoid uses A-Za-z0-9_- alphabet
       // After lowercase conversion: a-z0-9_-
-      const urlSafePattern = /^[a-z0-9_-]+$/;
+      const urlSafePattern = /^[a-z0-9]+$/;
 
       for (let i = 0; i < 50; i++) {
         const id = getConversationId();
@@ -86,7 +86,7 @@ describe('getConversationId', () => {
       // IDs should be valid
       for (const id of ids) {
         expect(id.length).toBeGreaterThan(0);
-        expect(/^[a-z0-9_-]+$/.test(id)).toBe(true);
+        expect(/^[a-z0-9]+$/.test(id)).toBe(true);
       }
     });
   });

packages/agents-core/src/utils/conversations.ts

@@ -1,4 +1,8 @@
-import { nanoid } from 'nanoid';
+import { customAlphabet } from 'nanoid';
+
+// Create a custom nanoid generator with only lowercase letters and numbers
+// This ensures IDs are always lowercase and never start with a hyphen
+const generateId = customAlphabet('abcdefghijklmnopqrstuvwxyz0123456789', 21);
 
 /**
  * Generates a standardized conversation ID.
@@ -15,10 +19,5 @@ import { nanoid } from 'nanoid';
  * ```
  */
 export function getConversationId(): string {
-  let id = nanoid();
-
-  // Convert to lowercase and remove any leading hyphens
-  id = id.toLowerCase().replace(/^-+/, '');
-
-  return id;
+  return generateId();
 }