diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 00000000..00fbf314
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,10 @@
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  roots: ['<rootDir>/src'],
+  transform: {
+    '^.+\\.tsx?$': 'ts-jest'
+  },
+  testRegex: '(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$',
+  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node']
+};
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diff --git a/package.json b/package.json
new file mode 100644
index 00000000..c28b14f8
--- /dev/null
+++ b/package.json
@@ -0,0 +1,15 @@
+{
+  "name": "multi-agent-chat-platform",
+  "version": "0.1.0",
+  "scripts": {
+    "test": "jest",
+    "lint": "eslint . --ext .ts"
+  },
+  "devDependencies": {
+    "@types/jest": "^27.0.0",
+    "typescript": "^4.5.0",
+    "jest": "^27.0.0",
+    "ts-jest": "^27.0.0",
+    "eslint": "^8.0.0"
+  }
+}
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diff --git a/src/interfaces/conversation.interface.ts b/src/interfaces/conversation.interface.ts
new file mode 100644
index 00000000..b619dde7
--- /dev/null
+++ b/src/interfaces/conversation.interface.ts
@@ -0,0 +1,48 @@
+import { PersonalityProfile } from './personality.interface';
+
+/**
+ * Represents a message in a conversation
+ */
+export interface ChatMessage {
+  id: string;
+  agentId: string;
+  content: string;
+  timestamp: Date;
+}
+
+/**
+ * Defines the interface for managing conversation state
+ */
+export interface ConversationState {
+  sessionId: string;
+  participants: PersonalityProfile[];
+  messages: ChatMessage[];
+  
+  /**
+   * Add a new message to the conversation
+   * @param message Message to be added
+   */
+  addMessage(message: ChatMessage): void;
+  
+  /**
+   * Get the conversation history
+   * @returns Array of messages in chronological order
+   */
+  getMessageHistory(): ChatMessage[];
+}
+
+/**
+ * Conversation Orchestrator interface
+ */
+export interface ConversationOrchestrator {
+  /**
+   * Handle an incoming user message
+   * @param sessionId Unique session identifier
+   * @param userMessage User's input message
+   * @returns Responses from participating agents
+   */
+  handleMessage(sessionId: string, userMessage: string): Promise<{
+    agentId: string;
+    response: string;
+  }[]>;
+}
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diff --git a/src/interfaces/personality.interface.ts b/src/interfaces/personality.interface.ts
new file mode 100644
index 00000000..6a9f13ad
--- /dev/null
+++ b/src/interfaces/personality.interface.ts
@@ -0,0 +1,35 @@
+/**
+ * Interface for Personality Profile
+ * Defines the structure and validation rules for agent personalities
+ */
+export interface PersonalityProfile {
+  id: string;
+  name: string;
+  description: string;
+  tone: 'serious' | 'playful' | 'scholarly';
+  samplePrompts: string[];
+  
+  // Validation metadata
+  version: string;
+  createdAt: Date;
+  lastUpdated: Date;
+}
+
+/**
+ * Type guard for validating PersonalityProfile
+ * @param profile Potential personality profile to validate
+ * @returns Boolean indicating if profile is valid
+ */
+export function isValidPersonalityProfile(profile: any): profile is PersonalityProfile {
+  return (
+    typeof profile === 'object' &&
+    typeof profile.id === 'string' &&
+    typeof profile.name === 'string' &&
+    typeof profile.description === 'string' &&
+    ['serious', 'playful', 'scholarly'].includes(profile.tone) &&
+    Array.isArray(profile.samplePrompts) &&
+    profile.samplePrompts.every((prompt: any) => typeof prompt === 'string') &&
+    profile.createdAt instanceof Date &&
+    profile.lastUpdated instanceof Date
+  );
+}
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diff --git a/src/tests/personality.test.ts b/src/tests/personality.test.ts
new file mode 100644
index 00000000..390e93bb
--- /dev/null
+++ b/src/tests/personality.test.ts
@@ -0,0 +1,29 @@
+import { isValidPersonalityProfile, PersonalityProfile } from '../interfaces/personality.interface';
+
+describe('Personality Profile Validation', () => {
+  const validProfile: PersonalityProfile = {
+    id: 'test-profile-1',
+    name: 'Test Agent',
+    description: 'A test personality profile',
+    tone: 'scholarly',
+    samplePrompts: ['Hello', 'How are you?'],
+    version: '1.0.0',
+    createdAt: new Date(),
+    lastUpdated: new Date()
+  };
+
+  const invalidProfiles = [
+    {}, // Empty object
+    { id: 123 }, // Invalid type for id
+    { ...validProfile, tone: 'undefined-tone' }, // Invalid tone
+    { ...validProfile, samplePrompts: [123] } // Invalid prompt type
+  ];
+
+  test('valid profile should pass validation', () => {
+    expect(isValidPersonalityProfile(validProfile)).toBeTruthy();
+  });
+
+  test.each(invalidProfiles)('invalid profile should fail validation', (profile) => {
+    expect(isValidPersonalityProfile(profile)).toBeFalsy();
+  });
+});
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diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 00000000..387e8f4a
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "target": "es2020",
+    "module": "commonjs",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules"]
+}
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