From 0734b1f3a5b9034bfb2bd6e76b8668f558fef377 Mon Sep 17 00:00:00 2001
From: Jason Woltje <jason@diversecanvas.com>
Date: Wed, 2 Sep 2026 19:50:07 -0500
Subject: [PATCH] fix(launcher): detach stdin on agent container run (#5)

pi print mode reads piped stdin until EOF; an attached terminal stdin
blocked the one-shot run forever. Automated contexts (closed stdin)
never exposed it. Request text comes from the compose command.

Proven: tail -f /dev/null | scripts/hello.sh now returns MOSAIC_HELLO_OK
in ~4s (previously timed out at 30s); verify.sh remains green.

Closes #5
---
 scripts/hello.sh  | 5 ++++-
 scripts/verify.sh | 3 ++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/scripts/hello.sh b/scripts/hello.sh
index c2b23598..bbbaf57a 100755
--- a/scripts/hello.sh
+++ b/scripts/hello.sh
@@ -15,5 +15,8 @@ load_config
 bootstrap_runtime_dir
 
 # -T: no pseudo-TTY, so stdout is clean model output.
+# </dev/null: detach stdin. Pi's print mode reads piped stdin until EOF;
+# an interactive terminal would otherwise block it forever. The request
+# text comes from the compose command, not stdin, so nothing is lost.
 # Errors, if any, go to stderr for diagnostics.
-docker compose run --rm -T mosaic-agent
+docker compose run --rm -T mosaic-agent < /dev/null
diff --git a/scripts/verify.sh b/scripts/verify.sh
index 9a3384d7..54a47316 100755
--- a/scripts/verify.sh
+++ b/scripts/verify.sh
@@ -31,8 +31,9 @@ if ! docker image inspect "$IMAGE" >/dev/null 2>&1; then
 fi
 
 # 2. Run the agent request (stdout only = model response).
+# stdin detached: see hello.sh — print mode would block on a terminal.
 set +e
-RESPONSE="$(docker compose run --rm -T mosaic-agent 2>/tmp/mosaic-poc-stderr.$$)"
+RESPONSE="$(docker compose run --rm -T mosaic-agent </dev/null 2>/tmp/mosaic-poc-stderr.$$)"
 RC=$?
 set -e
 STDERR_FILE="/tmp/mosaic-poc-stderr.$$"