diff --git a/packages/api/remotes/src/agent-lookup.ts b/packages/api/remotes/src/agent-lookup.ts
index eb54ea9b0b..71d7a76379 100644
--- a/packages/api/remotes/src/agent-lookup.ts
+++ b/packages/api/remotes/src/agent-lookup.ts
@@ -20,8 +20,8 @@ export type ApiRemoteAgentResult =
 
 /** Resume configuration supplied by the owning Host composition. */
 export interface ApiRemoteAgentOptions {
-  /** Per-Agent defaults used when a cold identity must resume. */
-  readonly agentOptions?: AgentOptions
+  /** Read the per-Agent defaults when a cold identity must resume. */
+  readonly agentOptions?: () => AgentOptions
   /** Host-specific Agent-scope composition completed before publication. */
   readonly setup?: AgentSetup
 }
@@ -144,7 +144,7 @@ export function createApiRemoteAgentResolver(
           }
           const handle = await ctx.agents.resume({
             resumeSessionId: sessionId,
-            ...options.agentOptions === undefined ? {} : { agentOptions: options.agentOptions },
+            ...options.agentOptions === undefined ? {} : { agentOptions: options.agentOptions() },
             ...options.setup === undefined ? {} : { setup: options.setup },
           })
           return handle.agent
diff --git a/packages/host/apiproxy/tests/api-proxy-cold.spec.ts b/packages/host/apiproxy/tests/api-proxy-cold.spec.ts
index e5e137f0c4..8e79c641a8 100644
--- a/packages/host/apiproxy/tests/api-proxy-cold.spec.ts
+++ b/packages/host/apiproxy/tests/api-proxy-cold.spec.ts
@@ -206,7 +206,7 @@ describe('Remote Agent and Session lookup policy', () => {
     })
     const defaultAgentLookup = ctx.typert.lookups.get('agent')
     const defaultSessionLookup = ctx.typert.lookups.get('session')
-    createApiProxy(ctx, { provider: 'p', model: 'm', cwd: '/tmp', workspaceRoot: '/tmp' })
+    createApiProxy(ctx, { defaultTarget: () => ({ provider: 'p', model: 'm' }), cwd: '/tmp', workspaceRoot: '/tmp' })
     await vi.waitFor(() => {
       expect(ctx.typert.lookups.get('agent')).not.toBe(defaultAgentLookup)
       expect(ctx.typert.lookups.get('session')).not.toBe(defaultSessionLookup)
@@ -250,7 +250,7 @@ describe('Remote Agent and Session lookup policy', () => {
     const resume = vi.spyOn(ctx.agents, 'resume')
     const defaultAgentLookup = ctx.typert.lookups.get('agent')
     const defaultSessionLookup = ctx.typert.lookups.get('session')
-    createApiProxy(ctx, { provider: 'p', model: 'm', cwd: '/tmp', workspaceRoot: '/tmp' })
+    createApiProxy(ctx, { defaultTarget: () => ({ provider: 'p', model: 'm' }), cwd: '/tmp', workspaceRoot: '/tmp' })
     await vi.waitFor(() => {
       expect(ctx.typert.lookups.get('agent')).not.toBe(defaultAgentLookup)
       expect(ctx.typert.lookups.get('session')).not.toBe(defaultSessionLookup)