diff --git a/README.md b/README.md
index bf51af4..f163c96 100644
--- a/README.md
+++ b/README.md
@@ -157,6 +157,7 @@ Once configured, you can use these tools in Cursor:
 - `get_todos` - Get todos from a todo list (returns all pages; handles Basecamp pagination transparently)
 - `search_basecamp` - Search across projects, todos, and messages
 - `get_comments` - Get comments for a Basecamp item
+- `create_comment` - Create a comment on a Basecamp item
 - `get_campfire_lines` - Get recent messages from a Basecamp campfire
 - `get_daily_check_ins` - Get project's daily check-in questions
 - `get_question_answers` - Get answers to daily check-in questions
diff --git a/basecamp_fastmcp.py b/basecamp_fastmcp.py
index 9db0948..e2ab688 100644
--- a/basecamp_fastmcp.py
+++ b/basecamp_fastmcp.py
@@ -526,6 +526,38 @@ async def get_comments(recording_id: str, project_id: str) -> Dict[str, Any]:
             "message": str(e)
         }
 
+@mcp.tool()
+async def create_comment(recording_id: str, project_id: str, content: str) -> Dict[str, Any]:
+    """Create a comment on a Basecamp item.
+
+    Args:
+        recording_id: The item ID
+        project_id: The project ID
+        content: The comment content in HTML format
+    """
+    client = _get_basecamp_client()
+    if not client:
+        return _get_auth_error_response()
+
+    try:
+        comment = await _run_sync(client.create_comment, recording_id, project_id, content)
+        return {
+            "status": "success",
+            "comment": comment,
+            "message": "Comment created successfully"
+        }
+    except Exception as e:
+        logger.error(f"Error creating comment: {e}")
+        if "401" in str(e) and "expired" in str(e).lower():
+            return {
+                "error": "OAuth token expired",
+                "message": "Your Basecamp OAuth token expired during the API call. Please re-authenticate by visiting http://localhost:8000 and completing the OAuth flow again.",
+            }
+        return {
+            "error": "Execution error",
+            "message": str(e)
+        }
+
 @mcp.tool()
 async def get_campfire_lines(project_id: str, campfire_id: str) -> Dict[str, Any]:
     """Get recent messages from a Basecamp campfire (chat room).
diff --git a/mcp_server_cli.py b/mcp_server_cli.py
index 7981fc1..5e72fb3 100755
--- a/mcp_server_cli.py
+++ b/mcp_server_cli.py
@@ -197,6 +197,19 @@ class MCPServer:
                     "required": ["recording_id", "project_id"]
                 }
             },
+            {
+                "name": "create_comment",
+                "description": "Create a comment on a Basecamp item",
+                "inputSchema": {
+                    "type": "object",
+                    "properties": {
+                        "recording_id": {"type": "string", "description": "The item ID"},
+                        "project_id": {"type": "string", "description": "The project ID"},
+                        "content": {"type": "string", "description": "The comment content in HTML format"}
+                    },
+                    "required": ["recording_id", "project_id", "content"]
+                }
+            },
             {
                 "name": "get_campfire_lines",
                 "description": "Get recent messages from a Basecamp campfire (chat room)",
@@ -1015,6 +1028,17 @@ class MCPServer:
                     "count": len(comments)
                 }
 
+            elif tool_name == "create_comment":
+                recording_id = arguments.get("recording_id")
+                project_id = arguments.get("project_id")
+                content = arguments.get("content")
+                comment = client.create_comment(recording_id, project_id, content)
+                return {
+                    "status": "success",
+                    "comment": comment,
+                    "message": "Comment created successfully"
+                }
+
             elif tool_name == "get_campfire_lines":
                 project_id = arguments.get("project_id")
                 campfire_id = arguments.get("campfire_id")
diff --git a/tests/test_cli_server.py b/tests/test_cli_server.py
index c7c6c74..6fc41c8 100644
--- a/tests/test_cli_server.py
+++ b/tests/test_cli_server.py
@@ -102,7 +102,7 @@ def test_cli_server_tools_list():
 
         # Check that expected tools are present
         tool_names = [tool["name"] for tool in tools]
-        expected_tools = ["get_projects", "search_basecamp", "get_todos", "global_search"]
+        expected_tools = ["get_projects", "search_basecamp", "get_todos", "global_search", "create_comment"]
         for expected_tool in expected_tools:
             assert expected_tool in tool_names