diff --git a/src/router.ts b/src/router.ts
index 10a7b84..484610f 100644
--- a/src/router.ts
+++ b/src/router.ts
@@ -16,6 +16,8 @@ export class EventRouter {
   private log = logger.child({ component: 'event-router' });
   private activeTasks = 0;
   private trackerTools: ToolDefinition[];
+  /** Tasks taken via tool call (agent already knows about them — skip auto-processing) */
+  private selfAssignedTasks = new Set<string>();
   constructor(
     private config: AgentConfig,
     private client: TrackerClient,
@@ -24,6 +26,7 @@ export class EventRouter {
     this.trackerTools = createTrackerTools({
       trackerClient: client,
       agentSlug: config.slug,
+      selfAssignedTasks: this.selfAssignedTasks,
     });
     this.log.info({ toolCount: this.trackerTools.length }, 'Tracker tools registered');
   }
@@ -61,6 +64,13 @@ export class EventRouter {
       return;
     }
 
+    // Skip if agent took this task itself via tool call (already in conversation context)
+    if (this.selfAssignedTasks.has(task.id)) {
+      this.selfAssignedTasks.delete(task.id);
+      this.log.info('│  TASK %s self-assigned via tool, skipping auto-processing', task.key);
+      return;
+    }
+
     if (this.activeTasks >= this.config.maxConcurrentTasks) {
       this.log.warn({ taskId: task.id, activeTasks: this.activeTasks }, 'Max concurrent tasks reached, skipping');
       return;
diff --git a/src/tools/tasks.ts b/src/tools/tasks.ts
index bc2250e..b0d53e4 100644
--- a/src/tools/tasks.ts
+++ b/src/tools/tasks.ts
@@ -100,6 +100,7 @@ export function createTaskTools(ctx: ToolContext): ToolDefinition<any>[] {
       description: 'Take a task for yourself (atomically assign to this agent). Task must be in backlog or todo status.',
       parameters: TakeTaskParams,
       async execute(_id: string, params: any) {
+        ctx.selfAssignedTasks.add(params.task_id);
         await ctx.trackerClient.takeTask(params.task_id, ctx.agentSlug);
         return ok(`Task ${params.task_id} taken by ${ctx.agentSlug}`);
       },
diff --git a/src/tools/types.ts b/src/tools/types.ts
index a7ae20c..97fb9c2 100644
--- a/src/tools/types.ts
+++ b/src/tools/types.ts
@@ -4,4 +4,6 @@ import type { TrackerClient } from '../tracker/client.js';
 export interface ToolContext {
   trackerClient: TrackerClient;
   agentSlug: string;
+  /** Track tasks taken via tool call — prevents duplicate auto-processing */
+  selfAssignedTasks: Set<string>;
 }