diff --git a/src/agents/subagent-list.ts b/src/agents/subagent-list.ts
index 36c0f14aaa0..6ded31eb2a6 100644
--- a/src/agents/subagent-list.ts
+++ b/src/agents/subagent-list.ts
@@ -47,14 +47,14 @@ export type SubagentListItem = {
   endedAt?: number;
 };
 
-export type BuiltSubagentList = {
+type BuiltSubagentList = {
   total: number;
   active: SubagentListItem[];
   recent: SubagentListItem[];
   text: string;
 };
 
-export type SessionEntryResolution = {
+type SessionEntryResolution = {
   storePath: string;
   entry: SessionEntry | undefined;
 };
diff --git a/src/agents/subagent-recovery-state.ts b/src/agents/subagent-recovery-state.ts
index 9ba208bc921..779053bd899 100644
--- a/src/agents/subagent-recovery-state.ts
+++ b/src/agents/subagent-recovery-state.ts
@@ -3,7 +3,7 @@ import type { SessionEntry } from "../config/sessions.js";
 const SUBAGENT_RECOVERY_MAX_AUTOMATIC_ATTEMPTS = 2;
 const SUBAGENT_RECOVERY_REWEDGE_WINDOW_MS = 2 * 60_000;
 
-export type SubagentRecoveryGate =
+type SubagentRecoveryGate =
   | {
       allowed: true;
       nextAttempt: number;
diff --git a/src/agents/subagent-registry-cleanup.ts b/src/agents/subagent-registry-cleanup.ts
index 9bcc6c37b3b..f892a3686d9 100644
--- a/src/agents/subagent-registry-cleanup.ts
+++ b/src/agents/subagent-registry-cleanup.ts
@@ -4,7 +4,7 @@ import {
 } from "./subagent-lifecycle-events.js";
 import type { SubagentRunRecord } from "./subagent-registry.types.js";
 
-export type DeferredCleanupDecision =
+type DeferredCleanupDecision =
   | {
       kind: "defer-descendants";
       delayMs: number;
diff --git a/src/agents/subagent-registry-helpers.ts b/src/agents/subagent-registry-helpers.ts
index 0ee340bd4ef..d4b384140e4 100644
--- a/src/agents/subagent-registry-helpers.ts
+++ b/src/agents/subagent-registry-helpers.ts
@@ -36,10 +36,7 @@ export const ANNOUNCE_COMPLETION_HARD_EXPIRY_MS = 30 * 60_000;
 
 const FROZEN_RESULT_TEXT_MAX_BYTES = 100 * 1024;
 
-export type SubagentRunOrphanReason =
-  | "missing-session-entry"
-  | "missing-session-id"
-  | "stale-unended-run";
+type SubagentRunOrphanReason = "missing-session-entry" | "missing-session-id" | "stale-unended-run";
 
 export function capFrozenResultText(resultText: string): string {
   const trimmed = resultText.trim();
diff --git a/src/agents/subagent-registry-steer-runtime.ts b/src/agents/subagent-registry-steer-runtime.ts
index fdf82e86dbd..ceb0284320d 100644
--- a/src/agents/subagent-registry-steer-runtime.ts
+++ b/src/agents/subagent-registry-steer-runtime.ts
@@ -1,6 +1,6 @@
 import type { SubagentRunRecord } from "./subagent-registry.types.js";
 
-export type ReplaceSubagentRunAfterSteerParams = {
+type ReplaceSubagentRunAfterSteerParams = {
   previousRunId: string;
   nextRunId: string;
   fallback?: SubagentRunRecord;
diff --git a/src/agents/subagent-target-policy.ts b/src/agents/subagent-target-policy.ts
index 2a5e0255fd6..b243ce1fcd7 100644
--- a/src/agents/subagent-target-policy.ts
+++ b/src/agents/subagent-target-policy.ts
@@ -1,8 +1,6 @@
 import { normalizeAgentId } from "../routing/session-key.js";
 
-export type SubagentTargetPolicyResult =
-  | { ok: true }
-  | { ok: false; allowedText: string; error: string };
+type SubagentTargetPolicyResult = { ok: true } | { ok: false; allowedText: string; error: string };
 
 function normalizeAllowAgents(allowAgents: readonly string[] | undefined): {
   configured: boolean;
diff --git a/src/agents/system-prompt-params.ts b/src/agents/system-prompt-params.ts
index fc8a63e4292..ec5c90b60f0 100644
--- a/src/agents/system-prompt-params.ts
+++ b/src/agents/system-prompt-params.ts
@@ -11,7 +11,7 @@ import {
   type ResolvedTimeFormat,
 } from "./date-time.js";
 
-export type RuntimeInfoInput = {
+type RuntimeInfoInput = {
   agentId?: string;
   host: string;
   os: string;
@@ -28,7 +28,7 @@ export type RuntimeInfoInput = {
   canvasRootDir?: string;
 };
 
-export type SystemPromptRuntimeParams = {
+type SystemPromptRuntimeParams = {
   runtimeInfo: RuntimeInfoInput;
   userTimezone: string;
   userTime?: string;