fix(coding-agent): preserve json mode for piped stdin (#2848)

packages/coding-agent/CHANGELOG.md

@@ -7,6 +7,7 @@
 - RpcClient now forwards subprocess stderr to parent process in real-time ([#2805](https://github.com/badlogic/pi-mono/issues/2805))
 - Theme file watcher now handles async `fs.watch` error events instead of crashing the process ([#2791](https://github.com/badlogic/pi-mono/issues/2791))
 - Fixed CLI extension paths like `git:gist.github.com/...` being incorrectly resolved against cwd instead of being passed through to the package manager ([#2845](https://github.com/badlogic/pi-mono/pull/2845) by [@aliou](https://github.com/aliou))
+- Fixed piped stdin runs with `--mode json` to preserve JSONL output instead of falling back to plain text ([#2848](https://github.com/badlogic/pi-mono/pull/2848) by [@aliou](https://github.com/aliou))
 
 ## [0.65.0] - 2026-04-03
 

packages/coding-agent/src/main.ts

@@ -578,7 +578,7 @@ export async function main(args: string[]) {
 	let stdinContent: string | undefined;
 	if (appMode !== "rpc") {
 		stdinContent = await readPipedStdin();
-		if (stdinContent !== undefined) {
+		if (stdinContent !== undefined && appMode === "interactive") {
 			appMode = "print";
 		}
 	}