feat: add parentAgentId field to server types

Add parentAgentId field to enable agent parent/child hierarchy:
- ManagedAgentBase in agent-manager.ts
- AgentSessionConfig in agent-sdk-types.ts
- AgentSnapshotPayloadSchema in messages.ts
- toAgentPayload() in agent-projections.ts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/server/src/server/agent/agent-manager.ts

@@ -94,6 +94,7 @@ type ManagedAgentBase = {
   lastUsage?: AgentUsage;
   lastError?: string;
   attention: AttentionState;
+  parentAgentId?: string;
 };
 
 type ManagedAgentWithSession = ManagedAgentBase & {

packages/server/src/server/agent/agent-projections.ts

@@ -80,6 +80,7 @@ export function toAgentPayload(
     pendingPermissions: sanitizePendingPermissions(agent.pendingPermissions),
     persistence: sanitizePersistenceHandle(agent.persistence),
     title: options?.title ?? null,
+    parentAgentId: agent.parentAgentId,
   };
 
   const usage = sanitizeOptionalJsonValue<AgentUsage>(agent.lastUsage);

packages/server/src/server/agent/agent-sdk-types.ts

@@ -161,6 +161,7 @@ export type AgentSessionConfig = {
     claude?: Partial<ClaudeAgentOptions>;
   };
   mcpServers?: Record<string, unknown>;
+  parentAgentId?: string;
 };
 
 export interface AgentSession {

packages/server/src/server/messages.ts

@@ -245,6 +245,7 @@ export const AgentSnapshotPayloadSchema = z.object({
   requiresAttention: z.boolean().optional(),
   attentionReason: z.enum(["finished", "error", "permission"]).nullable().optional(),
   attentionTimestamp: z.string().nullable().optional(),
+  parentAgentId: z.string().optional(),
 });
 
 export type AgentSnapshotPayload = z.infer<typeof AgentSnapshotPayloadSchema>;

plan.md

@@ -292,12 +292,13 @@ Files requiring modification:
 
 ---
 
-- [ ] **Implement**: Add parentAgentId field to server types.
+- [x] **Implement**: Add parentAgentId field to server types.
 
   - Add `parentAgentId?: string` to `ManagedAgentBase` in `agent-manager.ts:77`
   - Add `parentAgentId?: string` to `AgentSessionConfig` in `agent-sdk-types.ts:148`
   - Update `toAgentPayload()` in `agent-projections.ts` to include `parentAgentId`
   - Run typecheck after changes.
+  - **Done (2025-12-21 19:45)**: Added `parentAgentId?: string` to `ManagedAgentBase` in `agent-manager.ts:97`, `AgentSessionConfig` in `agent-sdk-types.ts:164`, and `AgentSnapshotPayloadSchema` in `messages.ts:248`. Updated `toAgentPayload()` in `agent-projections.ts:83` to include `parentAgentId` in the payload. Typecheck passes.
 
 - [ ] **Implement**: Add parentAgentId to MCP create_agent tool.