From af0b2fa52880a0be48eb2f1e709386b91f1363ec Mon Sep 17 00:00:00 2001
From: Jeremiah Lowin <153965+jlowin@users.noreply.github.com>
Date: Sat, 27 Sep 2025 12:04:19 -0400
Subject: [PATCH 1/3] Default rich tracebacks to False

---
 src/fastmcp/settings.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/fastmcp/settings.py b/src/fastmcp/settings.py
index 95e9f6290..744b7302d 100644
--- a/src/fastmcp/settings.py
+++ b/src/fastmcp/settings.py
@@ -170,7 +170,7 @@ def normalize_log_level(cls, v):
                 """
             )
         ),
-    ] = True
+    ] = False
 
     deprecation_warnings: Annotated[
         bool,

From 411518e017fe78f98cc0dea68e6e14ed022c26df Mon Sep 17 00:00:00 2001
From: William Easton <bill.easton@elastic.co>
Date: Fri, 10 Oct 2025 16:39:14 -0400
Subject: [PATCH 2/3] Improve traceback handling for narrow terminals

---
 src/fastmcp/settings.py          |  2 +-
 src/fastmcp/utilities/logging.py | 36 ++++++++++++++++++++++++++------
 2 files changed, 31 insertions(+), 7 deletions(-)

diff --git a/src/fastmcp/settings.py b/src/fastmcp/settings.py
index 744b7302d..95e9f6290 100644
--- a/src/fastmcp/settings.py
+++ b/src/fastmcp/settings.py
@@ -170,7 +170,7 @@ def normalize_log_level(cls, v):
                 """
             )
         ),
-    ] = False
+    ] = True
 
     deprecation_warnings: Annotated[
         bool,
diff --git a/src/fastmcp/utilities/logging.py b/src/fastmcp/utilities/logging.py
index 4d06418df..cc872bf9f 100644
--- a/src/fastmcp/utilities/logging.py
+++ b/src/fastmcp/utilities/logging.py
@@ -47,25 +47,49 @@ def configure_logging(
     if logger is None:
         logger = logging.getLogger("fastmcp")
 
-    # Only configure the FastMCP logger namespace
+    formatter = logging.Formatter("%(message)s")
+
+    # Don't propagate to the root logger
+    logger.propagate = False
+    logger.setLevel(level)
+
+    # Configure the handler for normal logs
     handler = RichHandler(
         console=Console(stderr=True),
         rich_tracebacks=enable_rich_tracebacks,
         **rich_kwargs,
     )
-    formatter = logging.Formatter("%(message)s")
     handler.setFormatter(formatter)
 
-    logger.setLevel(level)
+    # filter to exclude tracebacks
+    handler.addFilter(lambda record: record.exc_info is None)
+
+    # Configure the handler for tracebacks, for tracebacks we use a compressed format:
+    # no path or level name to maximize width available for the traceback
+    # suppress framework frames and limit the number of frames to 3
+
+    import mcp
+    import pydantic
+
+    traceback_handler = RichHandler(
+        console=Console(stderr=True),
+        show_path=False,
+        show_level=False,
+        rich_tracebacks=enable_rich_tracebacks,
+        tracebacks_max_frames=3,
+        tracebacks_suppress=[fastmcp, mcp, pydantic],
+        **rich_kwargs,
+    )
+    traceback_handler.setFormatter(formatter)
+
+    traceback_handler.addFilter(lambda record: record.exc_info is not None)
 
     # Remove any existing handlers to avoid duplicates on reconfiguration
     for hdlr in logger.handlers[:]:
         logger.removeHandler(hdlr)
 
     logger.addHandler(handler)
-
-    # Don't propagate to the root logger
-    logger.propagate = False
+    logger.addHandler(traceback_handler)
 
 
 @contextlib.contextmanager

From 710a7632e1b7cd085517357af57458caef33faf7 Mon Sep 17 00:00:00 2001
From: William Easton <bill.easton@elastic.co>
Date: Fri, 10 Oct 2025 16:48:26 -0400
Subject: [PATCH 3/3] Small pr clean-up

---
 src/fastmcp/utilities/logging.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/fastmcp/utilities/logging.py b/src/fastmcp/utilities/logging.py
index cc872bf9f..ec7f47023 100644
--- a/src/fastmcp/utilities/logging.py
+++ b/src/fastmcp/utilities/logging.py
@@ -56,7 +56,6 @@ def configure_logging(
     # Configure the handler for normal logs
     handler = RichHandler(
         console=Console(stderr=True),
-        rich_tracebacks=enable_rich_tracebacks,
         **rich_kwargs,
     )
     handler.setFormatter(formatter)