diff --git a/gptme/tools/tmux.py b/gptme/tools/tmux.py
index 0d51f228..d7b6bea2 100644
--- a/gptme/tools/tmux.py
+++ b/gptme/tools/tmux.py
@@ -69,6 +69,17 @@ def new_session(command: str) -> Message:
     assert result.returncode == 0
     print(result.stdout, result.stderr)
 
+    # set session size
+    cmd = ["tmux", "resize-window", "-t", session_id, "-x", "120", "-y", "40"]
+    print(" ".join(cmd))
+    result = subprocess.run(
+        " ".join(cmd),
+        check=True,
+        capture_output=True,
+        text=True,
+        shell=True,
+    )
+
     cmd = ["tmux", "send-keys", "-t", session_id, command, "Enter"]
     print(" ".join(cmd))
     result = subprocess.run(
@@ -200,7 +211,7 @@ def execute_tmux(
 
 User: Can you show me the current content of the pane?
 Assistant: Of course! Let's inspect the pane content:
-```terminal
+```tmux
 inspect_pane 0
 ```
 System:
@@ -210,7 +221,7 @@ def execute_tmux(
 
 User: Stop the dev server
 Assistant: I'll send 'Ctrl+C' to the pane to stop the server:
-```terminal
+```tmux
 send_keys 0 C-c
 ```
 System: Sent 'C-c' to pane 0
@@ -225,8 +236,8 @@ def execute_tmux(
 
 #### Background process
 User: Start the dev server
-Assistant: Certainly! To start the dev server we should use the terminal tool to run it in a tmux session:
-```terminal
+Assistant: Certainly! To start the dev server we should use the tmux tool to run it in a tmux session:
+```tmux
 new_session 'npm run dev'
 ```
 
@@ -249,12 +260,12 @@ def execute_tmux(
 #### Ending a session
 User: I changed my mind
 Assistant: No problem! Let's kill the session and start over:
-```terminal
+```tmux
 list_sessions
 ```
 System: Active tmux sessions [0]
 Assistant:
-```terminal
+```tmux
 kill_session 0
 ```
 System: Killed tmux session with ID 0