diff --git a/tools/environments/local.py b/tools/environments/local.py
index 428d31294f..6d7e8da3c6 100644
--- a/tools/environments/local.py
+++ b/tools/environments/local.py
@@ -9,6 +9,23 @@ import time
 
 from tools.environments.base import BaseEnvironment
 
+# Noise lines emitted by interactive shells when stdin is not a terminal.
+# Filtered from output to keep tool results clean.
+_SHELL_NOISE = frozenset({
+    "bash: no job control in this shell",
+    "bash: no job control in this shell\n",
+    "no job control in this shell",
+    "no job control in this shell\n",
+})
+
+
+def _clean_shell_noise(output: str) -> str:
+    """Strip shell startup warnings that leak when using -i without a TTY."""
+    lines = output.split("\n", 2)  # only check first two lines
+    if lines and lines[0].strip() in _SHELL_NOISE:
+        return "\n".join(lines[1:])
+    return output
+
 
 class LocalEnvironment(BaseEnvironment):
     """Run commands directly on the host machine.
@@ -18,7 +35,7 @@ class LocalEnvironment(BaseEnvironment):
     - Background stdout drain thread to prevent pipe buffer deadlocks
     - stdin_data support for piping content (bypasses ARG_MAX limits)
     - sudo -S transform via SUDO_PASSWORD env var
-    - Uses bash login shell so user env (.profile/.bashrc) is available
+    - Uses interactive login shell so full user env is available
     """
 
     def __init__(self, cwd: str = "", timeout: int = 60, env: dict = None):
@@ -34,14 +51,15 @@ class LocalEnvironment(BaseEnvironment):
         exec_command = self._prepare_command(command)
 
         try:
-            # Use the user's login shell so that rc files (.profile, .bashrc,
-            # .zprofile, .zshrc, etc.) are sourced and user-installed tools
-            # (nvm, pyenv, cargo, etc.) are available. Without this, Python's
-            # Popen(shell=True) uses /bin/sh which is dash on Debian/Ubuntu
-            # and old bash on macOS — neither sources the user's environment.
+            # Use the user's shell as an interactive login shell (-lic) so
+            # that ALL rc files are sourced — including content after the
+            # interactive guard in .bashrc (case $- in *i*)..esac) where
+            # tools like nvm, pyenv, and cargo install their init scripts.
+            # -l alone isn't enough: .profile sources .bashrc, but the guard
+            # returns early because the shell isn't interactive.
             user_shell = os.environ.get("SHELL") or shutil.which("bash") or "/bin/bash"
             proc = subprocess.Popen(
-                [user_shell, "-lc", exec_command],
+                [user_shell, "-lic", exec_command],
                 text=True,
                 cwd=work_dir,
                 env=os.environ | self.env,
@@ -106,7 +124,8 @@ class LocalEnvironment(BaseEnvironment):
                 time.sleep(0.2)
 
             reader.join(timeout=5)
-            return {"output": "".join(_output_chunks), "returncode": proc.returncode}
+            output = _clean_shell_noise("".join(_output_chunks))
+            return {"output": output, "returncode": proc.returncode}
 
         except Exception as e:
             return {"output": f"Execution error: {str(e)}", "returncode": 1}
diff --git a/tools/process_registry.py b/tools/process_registry.py
index 230afd19c1..00a8a3257a 100644
--- a/tools/process_registry.py
+++ b/tools/process_registry.py
@@ -86,6 +86,14 @@ class ProcessRegistry:
       - Cleanup thread (sandbox reaping coordination)
     """
 
+    # Noise lines emitted by interactive shells when stdin is not a terminal.
+    _SHELL_NOISE = frozenset({
+        "bash: no job control in this shell",
+        "bash: no job control in this shell\n",
+        "no job control in this shell",
+        "no job control in this shell\n",
+    })
+
     def __init__(self):
         self._running: Dict[str, ProcessSession] = {}
         self._finished: Dict[str, ProcessSession] = {}
@@ -94,6 +102,14 @@ class ProcessRegistry:
         # Side-channel for check_interval watchers (gateway reads after agent run)
         self.pending_watchers: List[Dict[str, Any]] = []
 
+    @staticmethod
+    def _clean_shell_noise(text: str) -> str:
+        """Strip shell startup warnings from the beginning of output."""
+        lines = text.split("\n", 2)
+        if lines and lines[0].strip() in ProcessRegistry._SHELL_NOISE:
+            return "\n".join(lines[1:])
+        return text
+
     # ----- Spawn -----
 
     def spawn_local(
@@ -130,7 +146,7 @@ class ProcessRegistry:
                 import ptyprocess
                 user_shell = os.environ.get("SHELL") or shutil.which("bash") or "/bin/bash"
                 pty_proc = ptyprocess.PtyProcess.spawn(
-                    [user_shell, "-lc", command],
+                    [user_shell, "-lic", command],
                     cwd=session.cwd,
                     env=os.environ | (env_vars or {}),
                     dimensions=(30, 120),
@@ -166,7 +182,7 @@ class ProcessRegistry:
         # ensures rc files are sourced and user tools are available.
         user_shell = os.environ.get("SHELL") or shutil.which("bash") or "/bin/bash"
         proc = subprocess.Popen(
-            [user_shell, "-lc", command],
+            [user_shell, "-lic", command],
             text=True,
             cwd=session.cwd,
             env=os.environ | (env_vars or {}),
@@ -272,11 +288,15 @@ class ProcessRegistry:
 
     def _reader_loop(self, session: ProcessSession):
         """Background thread: read stdout from a local Popen process."""
+        first_chunk = True
         try:
             while True:
                 chunk = session.process.stdout.read(4096)
                 if not chunk:
                     break
+                if first_chunk:
+                    chunk = self._clean_shell_noise(chunk)
+                    first_chunk = False
                 with session._lock:
                     session.output_buffer += chunk
                     if len(session.output_buffer) > session.max_output_chars: