diff --git a/packages/server/src/server/agent/agent-projections.ts b/packages/server/src/server/agent/agent-projections.ts
index ca3d5eaa7..2e7a7e746 100644
--- a/packages/server/src/server/agent/agent-projections.ts
+++ b/packages/server/src/server/agent/agent-projections.ts
@@ -52,6 +52,7 @@ export function toStoredAgentRecord(
     attentionTimestamp: agent.attention.requiresAttention
       ? agent.attention.attentionTimestamp.toISOString()
       : null,
+    parentAgentId: agent.parentAgentId ?? null,
   } satisfies StoredAgentRecord;
 }
 
diff --git a/packages/server/src/server/agent/agent-registry.ts b/packages/server/src/server/agent/agent-registry.ts
index bc3963a6d..b47c12e8d 100644
--- a/packages/server/src/server/agent/agent-registry.ts
+++ b/packages/server/src/server/agent/agent-registry.ts
@@ -53,6 +53,7 @@ const STORED_AGENT_SCHEMA = z.object({
   requiresAttention: z.boolean().optional(),
   attentionReason: z.enum(["finished", "error", "permission"]).nullable().optional(),
   attentionTimestamp: z.string().nullable().optional(),
+  parentAgentId: z.string().nullable().optional(),
 });
 
 export type SerializableAgentConfig = Pick<
diff --git a/plan.md b/plan.md
index 6cbbbe749..fc5c4c069 100644
--- a/plan.md
+++ b/plan.md
@@ -364,12 +364,13 @@ Files requiring modification:
   - Click child agent in menu, verify navigation works
   - **Done (2025-12-21 17:45)**: PARTIAL PASS - MCP header injection IS working correctly. The `X-Caller-Agent-Id` header is being sent by parent agents and received by the MCP server. The `callerAgentId` is correctly used as `parentAgentId` when creating child agents. HOWEVER, discovered a bug: `parentAgentId` is stored in `persistence.metadata` but NOT at the top-level of the stored agent record. The `toStoredAgentRecord()` function in `agent-projections.ts` and the `STORED_AGENT_SCHEMA` in `agent-registry.ts` are missing `parentAgentId`. Fix task added below.
 
-- [ ] **Fix**: Add parentAgentId to stored agent record schema.
+- [x] **Fix**: Add parentAgentId to stored agent record schema.
 
   - Add `parentAgentId` to `STORED_AGENT_SCHEMA` in `agent-registry.ts`
   - Add `parentAgentId` to `toStoredAgentRecord()` output in `agent-projections.ts`
   - Read `parentAgentId` from `agent.parentAgentId` (which is on `ManagedAgentBase`)
   - Run typecheck after changes.
+  - **Done (2025-12-21 17:52)**: Added `parentAgentId: z.string().nullable().optional()` to `STORED_AGENT_SCHEMA` in `agent-registry.ts:56`. Added `parentAgentId: agent.parentAgentId ?? null` to `toStoredAgentRecord()` output in `agent-projections.ts:55`. Typecheck passes.
 
 - [ ] **Test**: Re-test parent/child hierarchy after storage fix.