fix: Improve Ctrl+C interruption of MCP tool calls

cecli/coders/agent_coder.py

@@ -16,6 +16,7 @@
 from cecli.helpers import nested, responses
 from cecli.helpers.background_commands import BackgroundCommandManager
 from cecli.helpers.conversation import ConversationService, MessageTag
+from cecli.helpers.coroutines import interruptible  # isort:skip
 from cecli.helpers.similarity import (
     cosine_similarity,
     create_bigram_vector,
@@ -27,10 +28,11 @@
 from cecli.mcp import LocalServer, McpServerManager
 from cecli.tools.utils.base_tool import BaseTool
 from cecli.tools.utils.registry import ToolRegistry
+from cecli.helpers.coroutines import interruptible
 from cecli.utils import copy_tool_call, tool_call_to_dict
 
 from .base_coder import Coder
 
 
 class AgentCoder(Coder):
     """Mode where the LLM autonomously manages which files are in context."""
@@ -301,8 +303,20 @@
                 else:
                     all_results_content.append(f"Error: Unknown tool name '{tool_name}'")
                 if tasks:
-                    task_results = await asyncio.gather(*tasks)
-                    all_results_content.extend(str(res) for res in task_results)
+                    gather_coro = asyncio.gather(*tasks, return_exceptions=True)
+                    task_results, interrupted = await interruptible(
+                        gather_coro, self.interrupt_event
+                    )
+
+                    if interrupted:
+                        self.io.tool_warning("Tool execution interrupted.")
+                        all_results_content.append("Tool execution interrupted by user.")
+                    elif task_results:
+                        for res in task_results:
+                            if isinstance(res, Exception):
+                                all_results_content.append(f"Error in tool execution: {res}")
+                            else:
+                                all_results_content.append(str(res))
 
                 if not await HookIntegration.call_post_tool_hooks(
                     self, tool_name, args_string, "\n\n".join(all_results_content)
@@ -393,7 +407,11 @@
 """)
                 return f"Error executing tool call {tool_name}: {e}"
 
-        return await _exec_async()
+        result, interrupted = await interruptible(_exec_async(), self.interrupt_event)
+
+        if interrupted:
+            return "Tool execution interrupted by user."
+        return result
 
     def _calculate_context_block_tokens(self, force=False):
         """

cecli/coders/base_coder.py

@@ -1370,11 +1370,6 @@ async def _run_parallel(self, with_message=None, preproc=True):
             except (SwitchCoderSignal, SystemExit):
                 # Re-raise SwitchCoder to be handled by outer try block
                 raise
-            except KeyboardInterrupt:
-                # Handle keyboard interrupt gracefully
-                self.io.set_placeholder("")
-                self.io.stop_spinner()
-                self.keyboard_interrupt()
             finally:
                 # Signal tasks to stop
                 self.input_running = False
@@ -1454,10 +1449,6 @@ async def input_task(self, preproc):
 
                 await asyncio.sleep(0.1)  # Small yield to prevent tight loop
 
-            except KeyboardInterrupt:
-                self.io.set_placeholder("")
-                self.keyboard_interrupt()
-                await self.io.stop_task_streams()
             except (SwitchCoderSignal, SystemExit):
                 raise
             except Exception as e:
@@ -1739,7 +1730,6 @@ def keyboard_interrupt(self):
         Console().show_cursor(True)
 
         self.io.tool_warning("\n\n^C KeyboardInterrupt")
-
         self.interrupt_event.set()
         self.last_keyboard_interrupt = time.time()
 
@@ -2260,9 +2250,16 @@ async def send_message(self, inp):
                         self.io.tool_error(err_msg)
 
                     self.io.tool_output(f"Retrying in {retry_delay:.1f} seconds...")
-                    await asyncio.sleep(retry_delay)
+
+                    _res, interrupted_sleep = await coroutines.interruptible(
+                        asyncio.sleep(retry_delay), self.interrupt_event
+                    )
+                    if interrupted_sleep:
+                        interrupted = True
+                        break
+
                     continue
-                except KeyboardInterrupt:
+                except (KeyboardInterrupt, asyncio.CancelledError):
                     interrupted = True
                     break
                 except FinishReasonLength:
@@ -2627,11 +2624,19 @@ async def _execute_mcp_tools(self, server, tool_calls):
                             all_results_content.append("Tool Request Aborted.")
                             continue
 
-                        call_result = await experimental_mcp_client.call_openai_tool(
-                            session=session,
-                            openai_tool=new_tool_call,
+                        async def do_tool_call():
+                            return await experimental_mcp_client.call_openai_tool(
+                                session=session,
+                                openai_tool=new_tool_call,
+                            )
+
+                        call_result, interrupted = await coroutines.interruptible(
+                            do_tool_call(), self.interrupt_event
                         )
 
+                        if interrupted:
+                            raise KeyboardInterrupt("Tool call interrupted")
+
                         content_parts = []
                         if call_result.content:
                             for item in call_result.content:
@@ -2676,6 +2681,9 @@ async def _execute_mcp_tools(self, server, tool_calls):
                         }
                     )
 
+                except KeyboardInterrupt:
+                    self.io.tool_warning(f"Tool call {tool_call.function.name} interrupted.")
+                    raise
                 except Exception as e:
                     tool_error = f"Error executing tool call {tool_call.function.name}: \n{e}"
                     self.io.tool_warning(
@@ -2692,6 +2700,9 @@ async def _execute_mcp_tools(self, server, tool_calls):
                 tool_responses.append(
                     {"role": "tool", "tool_call_id": tool_call.id, "content": connection_error}
                 )
+        except asyncio.CancelledError:
+            # Re-raise CancelledError to ensure the task cancellation propagates
+            raise
         except Exception as e:
             connection_error = f"Could not connect to server {server.name}\n{e}"
             self.io.tool_warning(connection_error)
@@ -2726,7 +2737,15 @@ async def process_tool_calls(self, tool_call_response):
             return False
 
         # 5. Execute tools
-        tool_responses_by_server = await self._execute_tool_groups(tool_groups)
+        self.interrupt_event.clear()
+
+        tool_responses_by_server, interrupted = await coroutines.interruptible(
+            self._execute_tool_groups(tool_groups), self.interrupt_event
+        )
+
+        if interrupted:
+            self.io.tool_warning("Tool execution interrupted.")
+            return False
 
         # 6. Add responses to conversation (re-prefixing if necessary)
         tool_responses = []
@@ -3038,33 +3057,22 @@ async def send(self, messages, model=None, functions=None, tools=None):
         self.token_profiler.start()
 
         try:
-            completion_task = asyncio.create_task(
-                model.send_completion(
-                    messages,
-                    functions,
-                    self.stream,
-                    self.temperature,
-                    # This could include any tools, but for now it is just MCP tools
-                    tools=tools,
-                    override_kwargs=self.model_kwargs.copy(),
-                )
+            completion_coro = model.send_completion(
+                messages,
+                functions,
+                self.stream,
+                self.temperature,
+                # This could include any tools, but for now it is just MCP tools
+                tools=tools,
+                override_kwargs=self.model_kwargs.copy(),
+                interrupt_event=self.interrupt_event,
             )
-            interrupt_task = asyncio.create_task(self.interrupt_event.wait())
 
-            done, pending = await asyncio.wait(
-                {completion_task, interrupt_task},
-                return_when=asyncio.FIRST_COMPLETED,
+            (hash_object, completion), interrupted = await coroutines.interruptible(
+                completion_coro, self.interrupt_event
             )
-
-            if interrupt_task in done:
-                completion_task.cancel()
-                try:
-                    await completion_task
-                except asyncio.CancelledError:
-                    pass
+            if interrupted:
                 raise KeyboardInterrupt
-
-            hash_object, completion = completion_task.result()
             self.chat_completion_call_hashes.append(hash_object.hexdigest())
 
             if not isinstance(completion, ModelResponse):
@@ -3087,7 +3095,7 @@ async def send(self, messages, model=None, functions=None, tools=None):
                 self.token_profiler.on_error()
                 self.calculate_and_show_tokens_and_cost(messages, completion)
             raise
-        except KeyboardInterrupt as kbi:
+        except (KeyboardInterrupt, asyncio.CancelledError) as kbi:
             self.keyboard_interrupt()
             raise kbi
         finally:

cecli/commands/load_mcp.py

@@ -20,48 +20,68 @@ async def execute(cls, io, coder, args, **kwargs):
             )
 
         server_names = args.strip().split()
+
         results = []
 
+        servers_to_load = []
+
         # Handle '*' wildcard to load all servers enabled by default
         if server_names == ["*"]:
             for server in coder.mcp_manager.servers:
                 if server in coder.mcp_manager.connected_servers:
                     results.append(f"Server already loaded: {server.name}")
                     continue
+
                 auto_connect = server.config.get("enabled", True)
                 if not auto_connect:
                     results.append(f"Skipping server (not enabled by default): {server.name}")
                     continue
-                did_connect = await coder.mcp_manager.connect_server(server.name)
-                if did_connect:
-                    results.append(f"Loaded server: {server.name}")
-                else:
-                    results.append(f"Unable to load server: {server.name}")
+
+                servers_to_load.append(server)
         else:
             for server_name in server_names:
                 server = coder.mcp_manager.get_server(server_name)
                 if server is None:
+                    io.tool_error(f"MCP server {server_name} does not exist.")
                     results.append(f"MCP server {server_name} does not exist.")
-                    continue
-
-                did_connect = await coder.mcp_manager.connect_server(server.name)
-                if did_connect:
-                    results.append(f"Loaded server: {server_name}")
                 else:
-                    results.append(f"Unable to load server: {server_name}")
+                    servers_to_load.append(server)
 
-        try:
-            return format_command_result(io, cls.NORM_NAME, "\n".join(results))
-        finally:
-            from . import SwitchCoderSignal
-
-            raise SwitchCoderSignal(
-                edit_format=coder.edit_format,
-                summarize_from_coder=False,
-                from_coder=coder,
-                show_announcements=True,
+        # Early exit if nothing valid to process
+        if not servers_to_load and results:
+            return format_command_result(io, cls.NORM_NAME, "", "\n".join(results))
+
+        # Process connections with interrupt support
+        for server in servers_to_load:
+            server_name = server.name
+            coder.interrupt_event.clear()
+
+            did_connect, interrupted = await coder.coroutines.interruptible(
+                coder.mcp_manager.connect_server(server_name),
+                coder.interrupt_event,
             )
 
+            if interrupted:
+                io.tool_warning(f"MCP connection interrupted: {server_name}")
+                results.append(f"Interrupted: {server_name}")
+                continue
+
+            if did_connect:
+                results.append(f"Loaded server: {server_name}")
+            else:
+                results.append(f"Unable to load server: {server_name}")
+
+        io.tool_output("\n".join(results))
+
+        from . import SwitchCoderSignal
+
+        raise SwitchCoderSignal(
+            edit_format=coder.edit_format,
+            summarize_from_coder=False,
+            from_coder=coder,
+            show_announcements=True,
+        )
+
     @classmethod
     def get_completions(cls, io, coder, args) -> List[str]:
         """Get completion options for load-mcp command."""

cecli/commands/remove_mcp.py

@@ -20,38 +20,59 @@ async def execute(cls, io, coder, args, **kwargs):
             )
 
         server_names = args.strip().split()
+
         results = []
+        servers_to_disconnect = []
 
         # Handle '*' wildcard to disconnect all servers
         if server_names == ["*"]:
             connected = [s for s in coder.mcp_manager.servers if s.is_connected]
+
             if not connected:
                 results.append("No MCP servers connected, nothing to remove.")
             else:
-                for server in connected:
-                    await coder.mcp_manager.disconnect_server(server.name)
-                    results.append(f"Removed server: {server.name}")
+                servers_to_disconnect.extend(connected)
         else:
             for server_name in server_names:
-                was_disconnected = await coder.mcp_manager.disconnect_server(server_name)
-                if was_disconnected:
-                    results.append(f"Removed server: {server_name}")
-                else:
-                    results.append(f"Unable to remove server: {server_name}")
+                servers_to_disconnect.append(server_name)
 
-        try:
-            return format_command_result(io, cls.NORM_NAME, "\n".join(results))
-        finally:
-            from . import SwitchCoderSignal
-
-            raise SwitchCoderSignal(
-                edit_format=coder.edit_format,
-                summarize_from_coder=False,
-                from_coder=coder,
-                show_announcements=True,
-                mcp_manager=coder.mcp_manager,
+        # Early exit if nothing to process
+        if not servers_to_disconnect and results:
+            return format_command_result(io, cls.NORM_NAME, "", "\n".join(results))
+
+        # Process disconnections with interrupt support
+        for item in servers_to_disconnect:
+            server_name = item.name if hasattr(item, "name") else item
+
+            coder.interrupt_event.clear()
+
+            was_disconnected, interrupted = await coder.coroutines.interruptible(
+                coder.mcp_manager.disconnect_server(server_name),
+                coder.interrupt_event,
             )
 
+            if interrupted:
+                io.tool_warning(f"MCP disconnection interrupted: {server_name}")
+                results.append(f"Interrupted: {server_name}")
+                continue
+
+            if was_disconnected:
+                results.append(f"Removed server: {server_name}")
+            else:
+                results.append(f"Unable to remove server: {server_name}")
+
+        io.tool_output("\n".join(results))
+
+        from . import SwitchCoderSignal
+
+        raise SwitchCoderSignal(
+            edit_format=coder.edit_format,
+            summarize_from_coder=False,
+            from_coder=coder,
+            show_announcements=True,
+            mcp_manager=coder.mcp_manager,
+        )
+
     @classmethod
     def get_completions(cls, io, coder, args) -> List[str]:
         """Get completion options for remove-mcp command."""