diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index 15a4327c..2caea4ec 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -8,6 +8,7 @@
 
 ### Fixed
 
+- Fixed startup timing output so `readPipedStdin` no longer includes `createAgentSessionRuntime` work ([#4829](https://github.com/earendil-works/pi/issues/4829)).
 - Fixed custom session directories so current-folder resume/continue lookups stay scoped to the active cwd while all-session listings cover the custom directory.
 - Fixed SIGTERM/SIGHUP exits to run extension `session_shutdown` cleanup and restore the terminal: signal-triggered shutdown now emits `session_shutdown` before any terminal writes, and SIGHUP no longer hard-exits, so extension resources (e.g. sockets) are released even when the terminal is gone ([#5080](https://github.com/earendil-works/pi/issues/5080)).
 - Fixed Windows startup crashes under MSYS2 ucrt64 Node.js by updating the native clipboard addon to napi-rs 3.x ([#5028](https://github.com/earendil-works/pi/issues/5028)).
diff --git a/packages/coding-agent/src/main.ts b/packages/coding-agent/src/main.ts
index 71206d9d..4b6c4e16 100644
--- a/packages/coding-agent/src/main.ts
+++ b/packages/coding-agent/src/main.ts
@@ -670,6 +670,7 @@ export async function main(args: string[], options?: MainOptions) {
 		agentDir,
 		sessionManager,
 	});
+	time("createAgentSessionRuntime");
 	const { services, session, modelFallbackMessage } = runtime;
 	const { settingsManager, modelRegistry, resourceLoader } = services;
 	configureHttpDispatcher(settingsManager.getHttpIdleTimeoutMs());