diff --git a/src/agents/pi-embedded-runner/run/payloads.ts b/src/agents/pi-embedded-runner/run/payloads.ts
index f1ff4dda7..7b3d40c5d 100644
--- a/src/agents/pi-embedded-runner/run/payloads.ts
+++ b/src/agents/pi-embedded-runner/run/payloads.ts
@@ -67,6 +67,12 @@ function resolveToolErrorWarningPolicy(params: {
   if ((normalizedToolName === "exec" || normalizedToolName === "bash") && !includeDetails) {
     return { showWarning: false, includeDetails };
   }
+  // sessions_send timeouts and errors are transient inter-session communication
+  // issues — the message may still have been delivered. Suppress warnings to
+  // prevent raw error text from leaking into the chat surface (#23989).
+  if (normalizedToolName === "sessions_send") {
+    return { showWarning: false, includeDetails };
+  }
   const isMutatingToolError =
     params.lastToolError.mutatingAction ?? isLikelyMutatingToolName(params.lastToolError.toolName);
   if (isMutatingToolError) {