diff --git a/cli/deploy/development/compose.py b/cli/deploy/development/compose.py
index 1638f2da53..ded49cee01 100644
--- a/cli/deploy/development/compose.py
+++ b/cli/deploy/development/compose.py
@@ -39,7 +39,6 @@ class Compose:
         check: bool = True,
         capture: bool = False,
         live: bool = False,
-        keep_lines: int = 400,
         text: bool = True,
         extra_env: dict[str, str] | None = None,
     ) -> subprocess.CompletedProcess:
@@ -49,9 +48,7 @@ class Compose:
             env.update({k: str(v) for k, v in extra_env.items()})
 
         if live:
-            r = run_streaming(
-                cmd, cwd=self.repo_root, env=env, keep_lines=keep_lines, text=text
-            )
+            r = run_streaming(cmd, cwd=self.repo_root, env=env, text=text)
         else:
             r = subprocess.run(
                 cmd,
@@ -158,8 +155,7 @@ class Compose:
                 ["sh", "-lc", "/opt/src/infinito/scripts/docker/entry.sh true"],
                 workdir="/opt/src/infinito",
                 check=False,
-                live=True,  # <--- live output
-                keep_lines=400,  # <--- tail for failure printing
+                live=True,
                 extra_env={
                     "ANSIBLE_FORCE_COLOR": "1",
                     "PY_COLORS": "1",
@@ -168,10 +164,6 @@ class Compose:
             )
 
             if r.returncode != 0:
-                print("===== entry.sh stdout (tail) =====")
-                print((r.stdout or "").rstrip() or "<empty>")
-                print("===== entry.sh stderr (tail) =====")
-                print((r.stderr or "").rstrip() or "<empty>")
                 raise RuntimeError(f"entry.sh init failed (rc={r.returncode})")
 
     def down(self) -> None:
@@ -193,7 +185,6 @@ class Compose:
         workdir: str | None = None,
         capture: bool = False,
         live: bool = False,
-        keep_lines: int = 400,
         tty: bool | None = None,
         extra_env: dict[str, str] | None = None,
     ) -> subprocess.CompletedProcess:
@@ -206,7 +197,7 @@ class Compose:
           - tty=False -> -T (CI safe)
 
         Streaming:
-          - live=True streams stdout/stderr to terminal while keeping a tail buffer.
+          - live=True streams stdout/stderr to terminal.
         """
         if tty is None:
             tty = not self._is_ci()
@@ -229,7 +220,6 @@ class Compose:
             check=check,
             capture=capture,
             live=live,
-            keep_lines=keep_lines,
         )
 
     def _get_infinito_container_id(self) -> str:
diff --git a/cli/deploy/development/deploy.py b/cli/deploy/development/deploy.py
index c8f9d3123f..c456a90af6 100644
--- a/cli/deploy/development/deploy.py
+++ b/cli/deploy/development/deploy.py
@@ -38,13 +38,11 @@ def _run_deploy(
     if passthrough:
         cmd.extend(passthrough)
 
-    # Live stream output for immediate visibility,
-    # while keeping a tail buffer for post-failure printing.
+    # Live stream output for immediate visibility.
     r = compose.exec(
         cmd,
         check=False,
         live=True,
-        keep_lines=400,
         extra_env={
             # Force ANSI colors even when no TTY is allocated (CI default).
             "ANSIBLE_FORCE_COLOR": "1",
@@ -53,13 +51,6 @@ def _run_deploy(
         },
     )
 
-    if r.returncode != 0:
-        print("===== deploy stdout (tail) =====")
-        print((r.stdout or "").rstrip() or "<empty>")
-        print("===== deploy stderr (tail) =====")
-        print((r.stderr or "").rstrip() or "<empty>")
-        print("===============================")
-
     return int(r.returncode)
 
 
diff --git a/cli/deploy/development/proc.py b/cli/deploy/development/proc.py
index 7d7e5620c2..5c4533d5dc 100644
--- a/cli/deploy/development/proc.py
+++ b/cli/deploy/development/proc.py
@@ -3,24 +3,21 @@ from __future__ import annotations
 import sys
 import subprocess
 import threading
-from collections import deque
-from typing import Deque, TextIO
+from typing import TextIO
 
 
 def _drain_stream(
     stream: TextIO,
     *,
     sink: TextIO,
-    buf: Deque[str],
 ) -> None:
     """
-    Read a text stream line-by-line, write to sink, and keep a tail buffer.
+    Read a text stream line-by-line and write to sink.
     """
     try:
         for line in iter(stream.readline, ""):
             sink.write(line)
             sink.flush()
-            buf.append(line.rstrip("\n"))
     finally:
         try:
             stream.close()
@@ -34,13 +31,10 @@ def run_streaming(
     *,
     cwd,
     env: dict[str, str],
-    keep_lines: int = 400,
     text: bool = True,
 ) -> subprocess.CompletedProcess:
     """
-    Run a subprocess, stream stdout/stderr live to the terminal, and return
-    a CompletedProcess whose stdout/stderr contain only the last `keep_lines`
-    lines (tail buffers).
+    Run a subprocess and stream stdout/stderr live to the terminal.
     """
     p = subprocess.Popen(
         cmd,
@@ -52,19 +46,16 @@ def run_streaming(
         bufsize=1,  # line buffered (best effort)
     )
 
-    out_buf: Deque[str] = deque(maxlen=int(keep_lines))
-    err_buf: Deque[str] = deque(maxlen=int(keep_lines))
-
     assert p.stdout is not None
     assert p.stderr is not None
 
     t_out = threading.Thread(
         target=_drain_stream,
-        kwargs={"stream": p.stdout, "sink": sys.stdout, "buf": out_buf},
+        kwargs={"stream": p.stdout, "sink": sys.stdout},
     )
     t_err = threading.Thread(
         target=_drain_stream,
-        kwargs={"stream": p.stderr, "sink": sys.stderr, "buf": err_buf},
+        kwargs={"stream": p.stderr, "sink": sys.stderr},
     )
 
     t_out.daemon = True
@@ -78,7 +69,4 @@ def run_streaming(
     t_out.join()
     t_err.join()
 
-    stdout_tail = ("\n".join(out_buf) + ("\n" if out_buf else "")).rstrip("\n")
-    stderr_tail = ("\n".join(err_buf) + ("\n" if err_buf else "")).rstrip("\n")
-
-    return subprocess.CompletedProcess(cmd, rc, stdout=stdout_tail, stderr=stderr_tail)
+    return subprocess.CompletedProcess(cmd, rc)