diff --git a/packages/server/src/server/agent/agent-manager.ts b/packages/server/src/server/agent/agent-manager.ts
index 03f6de1be8..b43b3cc259 100644
--- a/packages/server/src/server/agent/agent-manager.ts
+++ b/packages/server/src/server/agent/agent-manager.ts
@@ -2427,10 +2427,8 @@ export class AgentManager {
     return input.client.effectiveOptions?.(input.own) ?? input.own ?? {};
   }
 
-  private effectiveOptionsFor(
-    provider: AgentProvider,
-    own: ProviderOptions | undefined,
-  ): ProviderOptions {
+  /** What an agent of this provider runs with, given its own options: the defaults under them. */
+  effectiveOptionsFor(provider: AgentProvider, own: ProviderOptions | undefined): ProviderOptions {
     const client = this.clients.get(provider);
     return client ? this.launchOptionsFor({ client, own }) : (own ?? {});
   }
diff --git a/packages/server/src/server/agent/agent-projections.test.ts b/packages/server/src/server/agent/agent-projections.test.ts
index 38ba8bf3d1..7f5e62dc85 100644
--- a/packages/server/src/server/agent/agent-projections.test.ts
+++ b/packages/server/src/server/agent/agent-projections.test.ts
@@ -17,6 +17,9 @@ import type {
   AgentSessionConfig,
 } from "./agent-sdk-types.js";
 
+/** A provider with no defaults of its own: the effective options are the agent's own. */
+const ownOptionsOnly = (_provider: string, own: Record<string, unknown> | undefined) => own ?? {};
+
 type ManagedAgentOverrides = Omit<Partial<ManagedAgent>, "config" | "pendingPermissions"> & {
   config?: Partial<AgentSessionConfig>;
   pendingPermissions?: Map<string, AgentPermissionRequest>;
@@ -381,7 +384,7 @@ describe("toAgentPayload", () => {
       }),
     );
 
-    const payload = buildStoredAgentPayload(record, ["codex"]);
+    const payload = buildStoredAgentPayload(record, ["codex"], ownOptionsOnly);
 
     expect(record.persistence?.metadata).toEqual({
       conversationId: "conversation-stored",
@@ -422,7 +425,7 @@ describe("toAgentPayload", () => {
       }),
     );
 
-    const payload = buildStoredAgentPayload(record, ["codex"]);
+    const payload = buildStoredAgentPayload(record, ["codex"], ownOptionsOnly);
 
     expect(payload.status).toBe("closed");
     expect(payload.controls).toEqual(controls);
@@ -441,15 +444,37 @@ describe("toAgentPayload", () => {
     ]);
   });
 
+  it("projects a closed agent's options with the provider defaults under its own, like a live one", () => {
+    const record = toStoredAgentRecord(
+      createManagedAgent({
+        provider: "claude",
+        lifecycle: "closed",
+        controls: [{ type: "toggle", key: "fast_mode", label: "Fast" }],
+        config: { provider: "claude", providerOptions: {} },
+      }),
+    );
+    const withConfigDefaults = (_provider: string, own: Record<string, unknown> | undefined) => ({
+      fast_mode: true,
+      ...own,
+    });
+
+    const payload = buildStoredAgentPayload(record, ["claude"], withConfigDefaults);
+
+    expect(payload.options).toEqual({ fast_mode: true });
+    expect(payload.features).toEqual([
+      { type: "toggle", id: "fast_mode", label: "Fast", value: true },
+    ]);
+  });
+
   it("carries a stored lastError onto the payload", () => {
     const record = toStoredAgentRecord(
       createManagedAgent({ provider: "codex", config: { provider: "codex" }, lastError: "boom" }),
     );
 
-    expect(buildStoredAgentPayload(record, ["codex"]).lastError).toBe("boom");
-    expect(buildStoredAgentPayload({ ...record, lastError: null }, ["codex"])).not.toHaveProperty(
-      "lastError",
-    );
+    expect(buildStoredAgentPayload(record, ["codex"], ownOptionsOnly).lastError).toBe("boom");
+    expect(
+      buildStoredAgentPayload({ ...record, lastError: null }, ["codex"], ownOptionsOnly),
+    ).not.toHaveProperty("lastError");
   });
 
   it("omits lastUsage when not available", () => {
diff --git a/packages/server/src/server/agent/agent-projections.ts b/packages/server/src/server/agent/agent-projections.ts
index 135a9fedf0..1f64b9965c 100644
--- a/packages/server/src/server/agent/agent-projections.ts
+++ b/packages/server/src/server/agent/agent-projections.ts
@@ -225,17 +225,24 @@ function visibilityFlags(agent: {
   };
 }
 
+/** The options an agent runs with, given the options it owns; see `toAgentPayload`. */
+export type EffectiveOptionsResolver = (
+  provider: AgentProvider,
+  own: ProviderOptions | undefined,
+) => ProviderOptions;
+
 function buildStoredOptionControls(
   record: StoredAgentRecord,
+  effectiveOptionsFor: EffectiveOptionsResolver,
 ): Pick<AgentSnapshotPayload, "features" | "options" | "controls"> {
   const controls = normalizeControls(record.controls);
-  const options = record.config?.providerOptions
-    ? sanitizeEffectiveOptions(record.config.providerOptions)
-    : undefined;
+  const options = sanitizeEffectiveOptions(
+    effectiveOptionsFor(record.provider, record.config?.providerOptions ?? undefined),
+  );
   return {
     // COMPAT(featureValues): added in v0.15.0, remove after 2027-05-01.
     features: featuresFromControls({ controls, options }),
-    ...(options ? { options } : {}),
+    options,
     controls,
   };
 }
@@ -243,6 +250,7 @@ function buildStoredOptionControls(
 export function buildStoredAgentPayload(
   record: StoredAgentRecord,
   validProviders: Iterable<AgentProvider>,
+  effectiveOptionsFor: EffectiveOptionsResolver,
 ): AgentSnapshotPayload {
   const defaultCapabilities = {
     supportsStreaming: false,
@@ -261,7 +269,7 @@ export function buildStoredAgentPayload(
   const lastUserMessageAt = record.lastUserMessageAt ? new Date(record.lastUserMessageAt) : null;
 
   const runtimeInfo = buildStoredRuntimeInfo(record);
-  const optionControls = buildStoredOptionControls(record);
+  const optionControls = buildStoredOptionControls(record, effectiveOptionsFor);
   const providerAvailable = isStoredAgentProviderAvailable(record, validProviders);
   const persistence = projectPersistenceHandleForWire(
     buildStoredPersistenceHandle(record, validProviders),
diff --git a/packages/server/src/server/agent/directory.test.ts b/packages/server/src/server/agent/directory.test.ts
index e5767de4f7..647db9aef9 100644
--- a/packages/server/src/server/agent/directory.test.ts
+++ b/packages/server/src/server/agent/directory.test.ts
@@ -55,7 +55,8 @@ beforeEach(async () => {
     projectLive: () => {
       throw new Error("No live agents in this suite");
     },
-    projectStored: (record) => buildStoredAgentPayload(record, ["codex"]),
+    projectStored: (record) =>
+      buildStoredAgentPayload(record, ["codex"], (_provider, own) => own ?? {}),
     isProviderVisible: () => true,
     isStoredProviderAvailable: () => true,
   });
diff --git a/packages/server/src/server/agent/finish-subscriptions/finish-subscriptions.test.ts b/packages/server/src/server/agent/finish-subscriptions/finish-subscriptions.test.ts
index 323e4be48f..9e18f87948 100644
--- a/packages/server/src/server/agent/finish-subscriptions/finish-subscriptions.test.ts
+++ b/packages/server/src/server/agent/finish-subscriptions/finish-subscriptions.test.ts
@@ -123,6 +123,7 @@ function outcome(status: "idle" | "running" | "closed" | "error" = "closed"): Wa
         lastStatus: status,
       },
       ["codex"],
+      (_provider, own) => own ?? {},
     ),
     lastMessage: "Partial work saved",
     error: null,
diff --git a/packages/server/src/server/agent/finish-subscriptions/internal/observation-stream.test.ts b/packages/server/src/server/agent/finish-subscriptions/internal/observation-stream.test.ts
index 1d15a890df..5bc0b3f7d7 100644
--- a/packages/server/src/server/agent/finish-subscriptions/internal/observation-stream.test.ts
+++ b/packages/server/src/server/agent/finish-subscriptions/internal/observation-stream.test.ts
@@ -43,6 +43,7 @@ class Host implements HostObservation {
           updatedAt: "2026-01-01",
         },
         ["codex"],
+        (_provider, own) => own ?? {},
       ),
       event,
       "Last response",
@@ -133,6 +134,7 @@ test("late initial permission snapshot cannot resurrect an already resolved requ
         updatedAt: "2026-01-01",
       },
       ["codex"],
+      (_provider, own) => own ?? {},
     );
     if (requestEvent.type !== "permission_requested") throw new Error("Expected permission");
     final.pendingPermissions = [requestEvent.request];
diff --git a/packages/server/src/server/agent/finish-subscriptions/internal/observation.ts b/packages/server/src/server/agent/finish-subscriptions/internal/observation.ts
index 7abe483cf4..bfe77db3f2 100644
--- a/packages/server/src/server/agent/finish-subscriptions/internal/observation.ts
+++ b/packages/server/src/server/agent/finish-subscriptions/internal/observation.ts
@@ -34,7 +34,11 @@ export function createFinishObservation(input: {
           const stored = await agentStorage.get(agentId);
           return {
             status: stored?.lastStatus === "error" ? "error" : "idle",
-            final: stored ? buildStoredAgentPayload(stored, [stored.provider]) : null,
+            final: stored
+              ? buildStoredAgentPayload(stored, [stored.provider], (provider, own) =>
+                  agentManager.effectiveOptionsFor(provider, own),
+                )
+              : null,
             lastMessage: await agentManager.getLastAssistantMessage(agentId),
             error: stored?.lastError ?? null,
           };
@@ -93,7 +97,14 @@ export function createFinishObservation(input: {
             type: "turn_started",
             provider: current.provider,
           });
-        else publish(stored ? buildStoredAgentPayload(stored, [stored.provider]) : null);
+        else
+          publish(
+            stored
+              ? buildStoredAgentPayload(stored, [stored.provider], (provider, own) =>
+                  agentManager.effectiveOptionsFor(provider, own),
+                )
+              : null,
+          );
         const stop = () => unsubscribe();
         signal.addEventListener("abort", stop, { once: true });
         return async () => {
diff --git a/packages/server/src/server/agent/tools/paseo-tools.ts b/packages/server/src/server/agent/tools/paseo-tools.ts
index 1ac0882d82..53c2e90d06 100644
--- a/packages/server/src/server/agent/tools/paseo-tools.ts
+++ b/packages/server/src/server/agent/tools/paseo-tools.ts
@@ -2133,6 +2133,7 @@ function createToolCatalog(
       const structuredSnapshot = buildStoredAgentPayload(
         record,
         new Set(providerSnapshotManager.listRegisteredProviderIds()),
+        (provider, own) => agentManager.effectiveOptionsFor(provider, own),
       );
       return {
         content: [],
@@ -2188,6 +2189,7 @@ function createToolCatalog(
           buildStoredAgentPayload(
             record,
             new Set(providerSnapshotManager.listRegisteredProviderIds()),
+            (provider, own) => agentManager.effectiveOptionsFor(provider, own),
           ),
         isProviderVisible: () => true,
         isStoredProviderAvailable: (record) =>
diff --git a/packages/server/src/server/hub/daemon-executions.ts b/packages/server/src/server/hub/daemon-executions.ts
index c55b6e3258..029e2090c7 100644
--- a/packages/server/src/server/hub/daemon-executions.ts
+++ b/packages/server/src/server/hub/daemon-executions.ts
@@ -288,7 +288,11 @@ export class DaemonExecutions implements HubExecutionAgents {
       agent: live
         ? serializeAgentSnapshot(live)
         : {
-            ...buildStoredAgentPayload(record, this.agentManager.getRegisteredProviderIds()),
+            ...buildStoredAgentPayload(
+              record,
+              this.agentManager.getRegisteredProviderIds(),
+              (provider, own) => this.agentManager.effectiveOptionsFor(provider, own),
+            ),
             status: "closed",
           },
     };
diff --git a/packages/server/src/server/session.ts b/packages/server/src/server/session.ts
index b31a55210c..e1b5d61a23 100644
--- a/packages/server/src/server/session.ts
+++ b/packages/server/src/server/session.ts
@@ -2183,7 +2183,9 @@ export class Session {
     record: StoredAgentRecord,
     registeredProviderIds = new Set(this.providerSnapshotManager.listRegisteredProviderIds()),
   ): AgentSnapshotPayload {
-    return buildStoredAgentPayload(record, registeredProviderIds);
+    return buildStoredAgentPayload(record, registeredProviderIds, (provider, own) =>
+      this.agentManager.effectiveOptionsFor(provider, own),
+    );
   }
 
   private isProviderVisibleToClient(provider: string): boolean {
diff --git a/packages/server/src/server/session.workspaces.test.ts b/packages/server/src/server/session.workspaces.test.ts
index 6b1db34449..caff1b1b3d 100644
--- a/packages/server/src/server/session.workspaces.test.ts
+++ b/packages/server/src/server/session.workspaces.test.ts
@@ -2097,7 +2097,8 @@ test("workspace mark unread selects a finished cross-workspace child with scoped
     projectLive: async () => {
       throw new Error("No live agents");
     },
-    projectStored: (record) => buildStoredAgentPayload(record, ["codex"]),
+    projectStored: (record) =>
+      buildStoredAgentPayload(record, ["codex"], (_provider, own) => own ?? {}),
     isProviderVisible: () => true,
     isStoredProviderAvailable: () => true,
   });
diff --git a/packages/server/src/server/test-utils/session-stubs.ts b/packages/server/src/server/test-utils/session-stubs.ts
index a6ceb24ed8..ca702dc36d 100644
--- a/packages/server/src/server/test-utils/session-stubs.ts
+++ b/packages/server/src/server/test-utils/session-stubs.ts
@@ -37,6 +37,7 @@ export function asAgentManager(stub: {
   return createStub<SessionOptions["agentManager"]>({
     listProviderSubagentActivity: () => [],
     getRetiredInternalAgent: () => null,
+    effectiveOptionsFor: (_provider: string, own?: Record<string, unknown>) => own ?? {},
     ...stub,
   });
 }
diff --git a/packages/server/src/server/workspace-directory.test.ts b/packages/server/src/server/workspace-directory.test.ts
index ab2ead15aa..e291007db1 100644
--- a/packages/server/src/server/workspace-directory.test.ts
+++ b/packages/server/src/server/workspace-directory.test.ts
@@ -921,7 +921,8 @@ test("scoped descriptor builds allocate independently of archived history", asyn
       projectLive: async () => {
         throw new Error("Unexpected live projection");
       },
-      projectStored: (record) => buildStoredAgentPayload(record, ["codex"]),
+      projectStored: (record) =>
+        buildStoredAgentPayload(record, ["codex"], (_provider, own) => own ?? {}),
       isProviderVisible: () => true,
       isStoredProviderAvailable: () => true,
     });