diff --git a/packages/app/src/hooks/use-aggregated-agents.ts b/packages/app/src/hooks/use-aggregated-agents.ts
index 034bb282c..425ddb3c7 100644
--- a/packages/app/src/hooks/use-aggregated-agents.ts
+++ b/packages/app/src/hooks/use-aggregated-agents.ts
@@ -62,6 +62,10 @@ export function useAggregatedAgents(): AggregatedAgentsResult {
       const serverLabel = connectionStates.get(serverId)?.daemon.label ?? serverId;
       for (const agent of agents.values()) {
         // Use agent's own lastActivityAt field directly
+        // Skip child agents - only show root agents on homepage
+        if (agent.parentAgentId) {
+          continue;
+        }
         allAgents.push({
           id: agent.id,
           serverId,
@@ -74,6 +78,7 @@ export function useAggregatedAgents(): AggregatedAgentsResult {
           requiresAttention: agent.requiresAttention,
           attentionReason: agent.attentionReason,
           attentionTimestamp: agent.attentionTimestamp,
+          parentAgentId: agent.parentAgentId,
         });
       }
     }
diff --git a/plan.md b/plan.md
index 0f3b51ee2..43b68a3c1 100644
--- a/plan.md
+++ b/plan.md
@@ -308,19 +308,21 @@ Files requiring modification:
   - Run typecheck after changes.
   - **Done (2025-12-21 21:15)**: Added `parentAgentId` optional field to `create_agent` tool input schema in `mcp-server.ts:223-228`. Updated handler to accept `parentAgentId` parameter and pass it to `agentManager.createAgent()` in `mcp-server.ts:275`. Also updated `registerSession()` in `agent-manager.ts:730` to copy `parentAgentId` from config to the managed agent. Typecheck passes.
 
-- [ ] **Implement**: Add parentAgentId to client types and session store.
+- [x] **Implement**: Add parentAgentId to client types and session store.
 
   - Add `parentAgentId?: string` to `Agent` interface in `session-store.ts:85`
   - Add `parentAgentId?: string` to `AgentDirectoryEntry` in `agent-directory.ts:4`
   - Update message schema if needed in `messages.ts:351`
   - Run typecheck after changes.
+  - **Done (2025-12-21 21:30)**: Added `parentAgentId?: string` to `Agent` interface in `session-store.ts:109`, `AgentDirectoryEntry` in `agent-directory.ts:15`, and updated `getAgentDirectory()` in `session-store.ts:835` to include it. Also updated `normalizeAgentSnapshot()` in `session-context.tsx:142` to map from server payload. Server's `AgentSnapshotPayloadSchema` already had `parentAgentId`. Typecheck passes.
 
-- [ ] **Implement**: Filter homepage to show only root agents.
+- [x] **Implement**: Filter homepage to show only root agents.
 
   - In `use-aggregated-agents.ts`, filter agents: `agents.filter(a => !a.parentAgentId)`
   - Or filter in `agent-list.tsx` before rendering
   - Root agents are those with `parentAgentId === undefined` or `null`
   - Run typecheck after changes.
+  - **Done (2025-12-21 21:45)**: Added filter in `use-aggregated-agents.ts:66-68` to skip agents with `parentAgentId` when building the aggregated agents list. Also included `parentAgentId` in the aggregated agent object. Typecheck passes.
 
 - [ ] **Implement**: Add sub-agents section to agent info menu.