diff --git a/src/agents/pi-embedded-runner/run.ts b/src/agents/pi-embedded-runner/run.ts
index 4a3032ba5eb..2011980dcb0 100644
--- a/src/agents/pi-embedded-runner/run.ts
+++ b/src/agents/pi-embedded-runner/run.ts
@@ -1138,9 +1138,6 @@ export async function runEmbeddedPiAgent(
             lastAssistant: sessionLastAssistant,
             currentAttemptAssistant,
           } = attempt;
-          // Field is optional in the public harness SDK contract; default to
-          // false here so internal code can rely on a strict boolean. Internal
-          // embedded-runner attempt sets this explicitly. See #52147.
           const timedOutDuringToolExecution = attempt.timedOutDuringToolExecution ?? false;
           if (sessionIdUsed && sessionIdUsed !== activeSessionId) {
             activeSessionId = sessionIdUsed;
@@ -1247,9 +1244,6 @@ export async function runEmbeddedPiAgent(
           // ── Timeout-triggered compaction ──────────────────────────────────
           // When the LLM times out with high context usage, compact before
           // retrying to break the death spiral of repeated timeouts.
-          // Skip when the timeout fired during tool execution: the LLM had
-          // already responded, the prompt wasn't the problem, and compacting
-          // would lose the in-flight tool context. See #52147.
           if (timedOut && !timedOutDuringCompaction && !timedOutDuringToolExecution) {
             // Only consider prompt-side tokens here. API totals include output
             // tokens, which can make a long generation look like high context
@@ -2084,11 +2078,6 @@ export async function runEmbeddedPiAgent(
           // Timeout aborts can leave the run without any assistant payloads.
           // Emit an explicit timeout error instead of silently completing, so
           // callers do not lose the turn as an orphaned user message.
-          // Skip when the timeout fired during tool execution: the assistant
-          // did produce a response (a tool call) that ran long; the generic
-          // "no response from model" payload would mislead the caller. The
-          // partial tool output already in the session is the correct artifact
-          // to surface. See #52147.
           if (
             timedOut &&
             !timedOutDuringCompaction &&
diff --git a/src/agents/pi-embedded-runner/run/attempt.ts b/src/agents/pi-embedded-runner/run/attempt.ts
index f5d88246fd4..8ae7d8718bc 100644
--- a/src/agents/pi-embedded-runner/run/attempt.ts
+++ b/src/agents/pi-embedded-runner/run/attempt.ts
@@ -2252,11 +2252,6 @@ export async function runEmbeddedAttempt(
         aborted = true;
         if (isTimeout) {
           timedOut = true;
-          // Distinguish run-timer fires that occur while tool execution is in
-          // flight (LLM already responded; primary model is not at fault) from
-          // LLM-phase timeouts. Mirrors the `timedOutDuringCompaction` precedent
-          // (#46889) so the failover policy can skip pointless model fallback.
-          // Closes #52147.
           if (!timedOutDuringCompaction && countActiveToolExecutions(params.runId) > 0) {
             timedOutDuringToolExecution = true;
           }
diff --git a/src/agents/pi-embedded-runner/run/types.ts b/src/agents/pi-embedded-runner/run/types.ts
index 20cd456ac1c..b3113ddadde 100644
--- a/src/agents/pi-embedded-runner/run/types.ts
+++ b/src/agents/pi-embedded-runner/run/types.ts
@@ -58,16 +58,7 @@ export type EmbeddedRunAttemptResult = {
   idleTimedOut: boolean;
   /** True if the timeout occurred while compaction was in progress or pending. */
   timedOutDuringCompaction: boolean;
-  /**
-   * True if the run-level timer fired while at least one tool execution was
-   * still in flight. The LLM had already responded; the timeout is unrelated
-   * to the primary model and must not trigger model fallback. Closes #52147.
-   *
-   * Optional for plugin-SDK back-compat: this type is re-exported as
-   * `AgentHarnessAttemptResult` and third-party harnesses cannot necessarily
-   * observe in-flight tool state. Treat absent as `false` at the runner
-   * boundary; internal embedded-runner code always sets it explicitly.
-   */
+  /** Optional because this type is re-exported as `AgentHarnessAttemptResult`. */
   timedOutDuringToolExecution?: boolean;
   promptError: unknown;
   /**
diff --git a/src/agents/pi-embedded-subscribe.handlers.tools.ts b/src/agents/pi-embedded-subscribe.handlers.tools.ts
index f4d1707165a..a1b313afdde 100644
--- a/src/agents/pi-embedded-subscribe.handlers.tools.ts
+++ b/src/agents/pi-embedded-subscribe.handlers.tools.ts
@@ -92,15 +92,6 @@ function buildToolStartKey(runId: string, toolCallId: string): string {
   return `${runId}:${toolCallId}`;
 }
 
-/**
- * Count tool executions currently in flight for a given run.
- *
- * Reads the existing `toolStartData` map: handleToolExecutionStart inserts on
- * tool start, handleToolExecutionEnd deletes on completion. Used by the
- * embedded run timer to detect whether a run-level timeout fired while tool
- * execution was active (in which case the failover policy should not rotate
- * to a fallback model — the LLM had already responded).
- */
 export function countActiveToolExecutions(runId: string): number {
   const prefix = `${runId}:`;
   let count = 0;