refactor(agents): narrow embedded runner helper exports

src/agents/embedded-agent-runner/run/idle-timeout-breaker.ts

@@ -16,7 +16,7 @@
 export const MAX_CONSECUTIVE_IDLE_TIMEOUTS_BEFORE_OUTPUT = 5;
 
 /** Mutable outer-loop state that survives across retry/profile attempts. */
-export type IdleTimeoutBreakerState = {
+type IdleTimeoutBreakerState = {
   consecutiveIdleTimeoutsBeforeOutput: number;
 };
 
@@ -30,14 +30,14 @@ export function createIdleTimeoutBreakerState(): IdleTimeoutBreakerState {
  * model progress means durable text/tool-call progress, not merely billed token
  * deltas from a partial stream.
  */
-export type IdleTimeoutBreakerInput = {
+type IdleTimeoutBreakerInput = {
   idleTimedOut: boolean;
   completedModelProgress: boolean;
   outputTokens?: number;
 };
 
 /** Result of applying one attempt outcome to the breaker state. */
-export type IdleTimeoutBreakerStep = {
+type IdleTimeoutBreakerStep = {
   consecutive: number;
   tripped: boolean;
 };

src/agents/embedded-agent-runner/run/images.ts

@@ -83,7 +83,7 @@ const MEDIA_URI_REGEX = /\bmedia:\/\/inbound\/([^\]\s/\\]+)/;
 /**
  * Result of detecting an image reference in text.
  */
-export interface DetectedImageRef {
+interface DetectedImageRef {
   /** The raw matched string from the prompt */
   raw: string;
   /** The type of reference */

src/agents/embedded-agent-runner/tool-result-truncation.ts

@@ -45,8 +45,8 @@ const MAX_TOOL_RESULT_CONTEXT_SHARE = 0.3;
  * request-local ceiling so oversized tool output cannot dominate the next turn.
  */
 export const DEFAULT_MAX_LIVE_TOOL_RESULT_CHARS = 16_000;
-export const LARGE_CONTEXT_MAX_LIVE_TOOL_RESULT_CHARS = 32_000;
-export const XL_CONTEXT_MAX_LIVE_TOOL_RESULT_CHARS = 64_000;
+const LARGE_CONTEXT_MAX_LIVE_TOOL_RESULT_CHARS = 32_000;
+const XL_CONTEXT_MAX_LIVE_TOOL_RESULT_CHARS = 64_000;
 const LARGE_CONTEXT_TOOL_RESULT_TOKENS = 100_000;
 const XL_CONTEXT_TOOL_RESULT_TOKENS = 200_000;
 
@@ -389,7 +389,7 @@ function calculateRecoveryAggregateToolResultChars(
   );
 }
 
-export type ToolResultReductionPotential = {
+type ToolResultReductionPotential = {
   maxChars: number;
   aggregateBudgetChars: number;
   toolResultCount: number;