diff --git a/src/agent/manager.ts b/src/agent/manager.ts
index 9b017e2..fcbe7a7 100644
--- a/src/agent/manager.ts
+++ b/src/agent/manager.ts
@@ -13,6 +13,7 @@ import type {
   SpawnAgentOptions,
   AgentResult,
   AgentStatus,
+  AgentMode,
   PendingQuestions,
 } from './types.js';
 import type { AgentRepository } from '../db/repositories/agent-repository.js';
@@ -453,6 +454,7 @@ export class ClaudeAgentManager implements AgentManager {
     sessionId: string | null;
     worktreeId: string;
     status: string;
+    mode: string;
     createdAt: Date;
     updatedAt: Date;
   }): AgentInfo {
@@ -463,6 +465,7 @@ export class ClaudeAgentManager implements AgentManager {
       sessionId: agent.sessionId,
       worktreeId: agent.worktreeId,
       status: agent.status as AgentStatus,
+      mode: agent.mode as AgentMode,
       createdAt: agent.createdAt,
       updatedAt: agent.updatedAt,
     };
diff --git a/src/agent/mock-manager.ts b/src/agent/mock-manager.ts
index b29ed40..c7ece4a 100644
--- a/src/agent/mock-manager.ts
+++ b/src/agent/mock-manager.ts
@@ -133,6 +133,7 @@ export class MockAgentManager implements AgentManager {
       sessionId,
       worktreeId,
       status: 'running',
+      mode: options.mode ?? 'execute',
       createdAt: now,
       updatedAt: now,
     };
diff --git a/src/agent/types.ts b/src/agent/types.ts
index 1453cc9..ea665b4 100644
--- a/src/agent/types.ts
+++ b/src/agent/types.ts
@@ -7,6 +7,15 @@
 
 export type AgentStatus = 'idle' | 'running' | 'waiting_for_input' | 'stopped' | 'crashed';
 
+/**
+ * Agent operation mode.
+ *
+ * - execute: Standard task execution (default)
+ * - discuss: Gather context through questions, output decisions
+ * - breakdown: Decompose initiative into phases
+ */
+export type AgentMode = 'execute' | 'discuss' | 'breakdown';
+
 /**
  * Options for spawning a new agent
  */
@@ -19,6 +28,8 @@ export interface SpawnAgentOptions {
   prompt: string;
   /** Optional working directory (defaults to worktree path) */
   cwd?: string;
+  /** Agent operation mode (defaults to 'execute') */
+  mode?: AgentMode;
 }
 
 /**
@@ -37,6 +48,8 @@ export interface AgentInfo {
   worktreeId: string;
   /** Current status (waiting_for_input = paused on AskUserQuestion) */
   status: AgentStatus;
+  /** Current operation mode */
+  mode: AgentMode;
   /** When the agent was created */
   createdAt: Date;
   /** Last activity timestamp */
diff --git a/src/db/schema.ts b/src/db/schema.ts
index a5bc1b8..baf9a39 100644
--- a/src/db/schema.ts
+++ b/src/db/schema.ts
@@ -184,6 +184,9 @@ export const agents = sqliteTable('agents', {
   })
     .notNull()
     .default('idle'),
+  mode: text('mode', { enum: ['execute', 'discuss', 'breakdown'] })
+    .notNull()
+    .default('execute'),
   createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
   updatedAt: integer('updated_at', { mode: 'timestamp' }).notNull(),
 });
diff --git a/src/dispatch/manager.test.ts b/src/dispatch/manager.test.ts
index 14195b2..a55de39 100644
--- a/src/dispatch/manager.test.ts
+++ b/src/dispatch/manager.test.ts
@@ -64,6 +64,7 @@ function createMockAgentManager(
         sessionId: null,
         worktreeId: 'worktree-test',
         status: 'running',
+        mode: options.mode ?? 'execute',
         createdAt: new Date(),
         updatedAt: new Date(),
       };
@@ -88,6 +89,7 @@ function createIdleAgent(id: string, name: string): AgentInfo {
     sessionId: 'session-abc',
     worktreeId: 'worktree-xyz',
     status: 'idle',
+    mode: 'execute',
     createdAt: new Date(),
     updatedAt: new Date(),
   };