diff --git a/app/types/__tests__/agents.test.ts b/app/types/__tests__/agents.test.ts
new file mode 100644
index 0000000..58c028b
--- /dev/null
+++ b/app/types/__tests__/agents.test.ts
@@ -0,0 +1,27 @@
+import { describe, it, expect } from 'vitest'
+import type { AgentSignal, AnalystReport } from '../agents'
+
+describe('Agent Types', () => {
+  it('should define valid agent signal structure', () => {
+    const signal: AgentSignal = {
+      agent: 'fundamentals',
+      signal: 'bullish',
+      confidence: 0.85,
+      reasoning: 'Strong fundamentals',
+      timestamp: '2026-01-15T00:00:00.000Z'
+    }
+    expect(signal.agent).toBe('fundamentals')
+    expect(signal.signal).toBe('bullish')
+  })
+
+  it('should allow neutral signal', () => {
+    const signal: AgentSignal = {
+      agent: 'technical',
+      signal: 'neutral',
+      confidence: 0.5,
+      reasoning: 'Market indecision',
+      timestamp: '2026-01-15T00:00:00.000Z'
+    }
+    expect(signal.signal).toBe('neutral')
+  })
+})
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diff --git a/app/types/agents.ts b/app/types/agents.ts
new file mode 100644
index 0000000..21c7a0d
--- /dev/null
+++ b/app/types/agents.ts
@@ -0,0 +1,38 @@
+export type SignalType = 'bullish' | 'bearish' | 'neutral'
+
+export interface AgentSignal {
+  agent: 'fundamentals' | 'sentiment' | 'news' | 'technical' | 'trader'
+  signal: SignalType
+  confidence: number
+  reasoning: string
+  timestamp: string
+}
+
+export interface AnalystReport {
+  analyst: 'fundamentals' | 'sentiment' | 'news' | 'technical'
+  report: string
+  signal: AgentSignal
+}
+
+export interface DebateRound {
+  bullishView: string
+  bearishView: string
+  researcher: 'bullish' | 'bearish'
+}
+
+export interface TradingDecision {
+  action: 'buy' | 'sell' | 'hold'
+  confidence: number
+  targetPrice?: number
+  stopLoss?: number
+  reasoning: string
+  agentSignals: AgentSignal[]
+  debateRounds: DebateRound[]
+}
+
+export interface AgentConfig {
+  llmProvider: 'openrouter'
+  model: string
+  maxDebateRounds: number
+  temperature: number
+}
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