diff --git a/src/plyngent/agent/compact.py b/src/plyngent/agent/compact.py
index 8b1deec..3b2bf49 100644
--- a/src/plyngent/agent/compact.py
+++ b/src/plyngent/agent/compact.py
@@ -52,9 +52,7 @@ def format_transcript(messages: Sequence[AnyChatMessage]) -> str:
             if tool_calls is not UNSET and tool_calls:
                 for call in tool_calls:
                     if isinstance(call, AssistantFunctionToolCall):
-                        lines.append(
-                            f"[assistant tool_call] {call.function.name}({call.function.arguments})"
-                        )
+                        lines.append(f"[assistant tool_call] {call.function.name}({call.function.arguments})")
                     else:
                         lines.append(f"[assistant tool_call] custom id={call.id}")
         elif isinstance(msg, ToolChatMessage):
diff --git a/src/plyngent/agent/loop.py b/src/plyngent/agent/loop.py
index fde8f43..13031e3 100644
--- a/src/plyngent/agent/loop.py
+++ b/src/plyngent/agent/loop.py
@@ -104,9 +104,7 @@ async def _execute_tool_calls(
             *[_run_one_tool(tools, call, max_result_chars=max_result_chars) for call in tool_calls]
         )
     else:
-        results = [
-            await _run_one_tool(tools, call, max_result_chars=max_result_chars) for call in tool_calls
-        ]
+        results = [await _run_one_tool(tools, call, max_result_chars=max_result_chars) for call in tool_calls]
 
     for tool_msg, err in results:
         if err is not None:
diff --git a/src/plyngent/cli/app.py b/src/plyngent/cli/app.py
index afe13ba..5c847ec 100644
--- a/src/plyngent/cli/app.py
+++ b/src/plyngent/cli/app.py
@@ -90,8 +90,7 @@ async def _run_chat(
             except ValueError as exc:
                 raise click.ClickException(str(exc)) from exc
             click.echo(
-                f"resumed session {session_id} ({len(state.agent.messages)} messages) "
-                f"workspace={state.workspace}"
+                f"resumed session {session_id} ({len(state.agent.messages)} messages) workspace={state.workspace}"
             )
         elif new_session:
             await state.new_session()
diff --git a/src/plyngent/cli/display.py b/src/plyngent/cli/display.py
index 9c087e9..1d2e9f7 100644
--- a/src/plyngent/cli/display.py
+++ b/src/plyngent/cli/display.py
@@ -92,4 +92,3 @@ async def render_events(events: AsyncIterator[AgentEvent]) -> None:  # noqa: C90
     if printed_text:
         click.echo()
     click.echo()
-
diff --git a/src/plyngent/cli/interrupt.py b/src/plyngent/cli/interrupt.py
index bdbb77b..30c0291 100644
--- a/src/plyngent/cli/interrupt.py
+++ b/src/plyngent/cli/interrupt.py
@@ -43,7 +43,7 @@ def pause_task_cancel_for_prompt() -> Generator[None]:
             loop = asyncio.get_running_loop()
             _ = loop.remove_signal_handler(signal.SIGINT)
             loop_handler_removed = True
-        except (RuntimeError, NotImplementedError, ValueError):
+        except RuntimeError, NotImplementedError, ValueError:
             loop_handler_removed = False
 
         try:
diff --git a/src/plyngent/cli/limits.py b/src/plyngent/cli/limits.py
index aaf6755..e81878b 100644
--- a/src/plyngent/cli/limits.py
+++ b/src/plyngent/cli/limits.py
@@ -18,7 +18,7 @@ def _prompt_continue_limit_sync(reason: str) -> bool:
     click.secho(f"[limit] {reason}", fg="yellow")
     try:
         return bool(click.confirm("Raise limit and continue?", default=True))
-    except (click.Abort, KeyboardInterrupt):
+    except click.Abort, KeyboardInterrupt:
         return False
 
 
@@ -39,7 +39,7 @@ def _prompt_confirm_tool_sync(name: str, args: Mapping[str, object], reason: str
     click.secho(f"[confirm] tool {name!r}: {reason}", fg="yellow")
     try:
         return bool(click.confirm("Allow this tool call?", default=False))
-    except (click.Abort, KeyboardInterrupt):
+    except click.Abort, KeyboardInterrupt:
         return False
 
 
@@ -73,7 +73,7 @@ def _prompt_workspace_mismatch_sync(
             default="k",
             show_choices=True,
         )
-    except (click.Abort, KeyboardInterrupt):
+    except click.Abort, KeyboardInterrupt:
         return "abort"
     key = str(raw).strip().lower()
     if key == "u":
diff --git a/src/plyngent/cli/repl.py b/src/plyngent/cli/repl.py
index 760c9f6..5def036 100644
--- a/src/plyngent/cli/repl.py
+++ b/src/plyngent/cli/repl.py
@@ -94,9 +94,7 @@ async def _cmd_sessions(state: ReplState) -> None:
     for session in sessions:
         marker = "*" if session.sid == state.session_id else " "
         ws = session.workspace or "(unbound)"
-        click.echo(
-            f"{marker} {session.sid}\t{session.name}\tworkspace={ws}\tupdated={session.updated_at}"
-        )
+        click.echo(f"{marker} {session.sid}\t{session.name}\tworkspace={ws}\tupdated={session.updated_at}")
 
 
 async def _cmd_new(state: ReplState, arg: str) -> None:
@@ -126,10 +124,7 @@ async def _cmd_resume(state: ReplState, arg: str) -> None:
     except ValueError as exc:
         click.echo(f"error: {exc}")
         return
-    click.echo(
-        f"resumed session {session_id} ({len(state.agent.messages)} messages) "
-        f"workspace={state.workspace}"
-    )
+    click.echo(f"resumed session {session_id} ({len(state.agent.messages)} messages) workspace={state.workspace}")
 
 
 async def _cmd_compact(state: ReplState, arg: str) -> None:
diff --git a/src/plyngent/cli/retry.py b/src/plyngent/cli/retry.py
index 96331ec..ce7b101 100644
--- a/src/plyngent/cli/retry.py
+++ b/src/plyngent/cli/retry.py
@@ -57,14 +57,14 @@ async def run_cancellable[T](coro: Coroutine[object, object, T]) -> T:
     def _reinstall() -> None:
         try:
             loop.add_signal_handler(signal.SIGINT, _on_sigint)
-        except (NotImplementedError, RuntimeError, ValueError):
+        except NotImplementedError, RuntimeError, ValueError:
             return
 
     try:
         loop.add_signal_handler(signal.SIGINT, _on_sigint)
         installed = True
         set_sigint_reinstall(_reinstall)
-    except (NotImplementedError, RuntimeError, ValueError):
+    except NotImplementedError, RuntimeError, ValueError:
         installed = False
 
     try:
@@ -115,8 +115,7 @@ def _echo_turn_usage(agent: ChatAgent) -> None:
 
 async def _wait_for_retry(attempt: int, max_retries: int, wait: float) -> bool:
     click.secho(
-        f"auto-retry {attempt}/{max_retries} in {wait:g}s "
-        f"(Ctrl+C to cancel; then /retry later)",
+        f"auto-retry {attempt}/{max_retries} in {wait:g}s (Ctrl+C to cancel; then /retry later)",
         fg="yellow",
     )
     try:
diff --git a/src/plyngent/tools/file/fs_ops.py b/src/plyngent/tools/file/fs_ops.py
index 8ec0f2f..56df097 100644
--- a/src/plyngent/tools/file/fs_ops.py
+++ b/src/plyngent/tools/file/fs_ops.py
@@ -90,9 +90,7 @@ def copy_path(src: str, dst: str, *, overwrite: bool = False) -> str:
     source, dest, root = pair
     if not source.exists() and not source.is_symlink():
         return f"error: source does not exist: {src}"
-    return _copy_or_move_validated(
-        source, dest, root, src=src, dst=dst, overwrite=overwrite, action="copy"
-    )
+    return _copy_or_move_validated(source, dest, root, src=src, dst=dst, overwrite=overwrite, action="copy")
 
 
 @tool
@@ -106,9 +104,7 @@ def move_path(src: str, dst: str, *, overwrite: bool = False) -> str:
         return f"error: source does not exist: {src}"
     if source == root:
         return "error: cannot move the workspace root"
-    return _copy_or_move_validated(
-        source, dest, root, src=src, dst=dst, overwrite=overwrite, action="move"
-    )
+    return _copy_or_move_validated(source, dest, root, src=src, dst=dst, overwrite=overwrite, action="move")
 
 
 def _delete_directory(target: Path, path: str, *, recursive: bool) -> str:
diff --git a/src/plyngent/tools/file/glob_paths.py b/src/plyngent/tools/file/glob_paths.py
index 7f37964..bf879e6 100644
--- a/src/plyngent/tools/file/glob_paths.py
+++ b/src/plyngent/tools/file/glob_paths.py
@@ -41,7 +41,7 @@ def _collect_glob(
         try:
             resolved = candidate.resolve()
             rel = resolved.relative_to(root)
-        except (OSError, ValueError):
+        except OSError, ValueError:
             continue
         # Skip anything under (or itself) VCS / hidden path components.
         if skip_hidden_dirs and _hidden_or_vcs(rel.parts):
@@ -87,9 +87,7 @@ def glob_paths(
         return resolved
     root, base = resolved
 
-    result = _collect_glob(
-        base, root, pattern, max_matches=max_matches, skip_hidden_dirs=skip_hidden_dirs
-    )
+    result = _collect_glob(base, root, pattern, max_matches=max_matches, skip_hidden_dirs=skip_hidden_dirs)
     if isinstance(result, str):
         return result
     matches, truncated = result
diff --git a/src/plyngent/tools/process/pty_session.py b/src/plyngent/tools/process/pty_session.py
index 9f22712..d5a9ba8 100644
--- a/src/plyngent/tools/process/pty_session.py
+++ b/src/plyngent/tools/process/pty_session.py
@@ -210,7 +210,7 @@ class PtyManager:
             ready, _, _ = select.select([session.master_fd], [], [], timeout)
             if ready:
                 data = os.read(session.master_fd, to_read)
-        except (OSError, ValueError):
+        except OSError, ValueError:
             data = b""
         cls._poll_exit(session)
         if not data:
@@ -305,9 +305,7 @@ class PtyManager:
                 budget_exhausted=True,
             )
 
-        chunks, matched = cls._collect_chunks(
-            session, max_bytes=max_bytes, timeout=timeout, until=until
-        )
+        chunks, matched = cls._collect_chunks(session, max_bytes=max_bytes, timeout=timeout, until=until)
         data = b"".join(chunks).decode(errors="replace")
         truncated = len(data) > max_bytes
         if truncated:
diff --git a/src/plyngent/tools/vcs/tools.py b/src/plyngent/tools/vcs/tools.py
index 5f48619..5af8272 100644
--- a/src/plyngent/tools/vcs/tools.py
+++ b/src/plyngent/tools/vcs/tools.py
@@ -18,10 +18,7 @@ def _backend_or_error() -> VcsBackend | str:
         return f"error: {exc}"
     backend = detect_vcs(root)
     if backend is None:
-        return (
-            "error: no supported VCS detected under workspace "
-            "(currently: git; other systems can register detectors)"
-        )
+        return "error: no supported VCS detected under workspace (currently: git; other systems can register detectors)"
     return backend
 
 
diff --git a/tests/test_agent/test_compact.py b/tests/test_agent/test_compact.py
index 0a88c40..6fafeb0 100644
--- a/tests/test_agent/test_compact.py
+++ b/tests/test_agent/test_compact.py
@@ -96,9 +96,7 @@ def test_compact_disabled_when_max_tokens_zero() -> None:
         ToolChatMessage(content="x" * 500, tool_call_id="1"),
     ]
     out = compact_messages_for_request(messages, max_tokens=0)
-    assert out[0] is messages[0] or (
-        isinstance(out[0], ToolChatMessage) and out[0].content == "x" * 500
-    )
+    assert out[0] is messages[0] or (isinstance(out[0], ToolChatMessage) and out[0].content == "x" * 500)
 
 
 def test_measure_messages_tokens_calibrates_to_api_hint() -> None:
diff --git a/tests/test_agent/test_compact_summarize.py b/tests/test_agent/test_compact_summarize.py
index ac42923..46ec4e3 100644
--- a/tests/test_agent/test_compact_summarize.py
+++ b/tests/test_agent/test_compact_summarize.py
@@ -53,8 +53,10 @@ def test_build_compacted_seed_messages() -> None:
     assert isinstance(seed[0], SystemChatMessage)
     assert seed[0].content == "sys"
     assert isinstance(seed[1], AssistantChatMessage)
-    assert "summary text" in seed[1].content
-    assert "session 3" in seed[1].content
+    content = seed[1].content
+    assert isinstance(content, str)
+    assert "summary text" in content
+    assert "session 3" in content
 
 
 class SummaryClient:
diff --git a/tests/test_agent/test_loop.py b/tests/test_agent/test_loop.py
index 373f57e..d714159 100644
--- a/tests/test_agent/test_loop.py
+++ b/tests/test_agent/test_loop.py
@@ -617,7 +617,6 @@ async def test_retry_after_resume_orphan_user() -> None:
     await store.close()
 
 
-
 async def test_chat_agent_system_prompt_prepended() -> None:
     from plyngent.lmproto.openai_compatible.model import SystemChatMessage
 
diff --git a/tests/test_cli/test_repl_commands.py b/tests/test_cli/test_repl_commands.py
index 65b125d..02d0317 100644
--- a/tests/test_cli/test_repl_commands.py
+++ b/tests/test_cli/test_repl_commands.py
@@ -142,9 +142,7 @@ async def test_rounds(state: ReplState) -> None:
     assert state.agent.max_rounds == 40
 
 
-async def test_status_shows_context_tokens(
-    state: ReplState, capsys: pytest.CaptureFixture[str]
-) -> None:
+async def test_status_shows_context_tokens(state: ReplState, capsys: pytest.CaptureFixture[str]) -> None:
     from plyngent.agent.usage import TokenUsage
     from plyngent.lmproto.openai_compatible.model import UserChatMessage
 
diff --git a/tests/test_config/test_agent_section.py b/tests/test_config/test_agent_section.py
index 4f4f07d..51f9c1e 100644
--- a/tests/test_config/test_agent_section.py
+++ b/tests/test_config/test_agent_section.py
@@ -41,4 +41,3 @@ max_context_tokens = 5000
     assert store.agent_config.confirm_destructive is False
     assert store.agent_config.path_denylist == ["/secrets/", ".ssh/"]
     assert store.agent_config.max_context_tokens == 5000
-
diff --git a/tests/test_tools/test_danger.py b/tests/test_tools/test_danger.py
index da05955..4ab69fc 100644
--- a/tests/test_tools/test_danger.py
+++ b/tests/test_tools/test_danger.py
@@ -13,9 +13,7 @@ def test_classify_delete_and_move() -> None:
 
 def test_classify_copy_overwrite_only() -> None:
     assert classify_danger("copy_path", {"src": "a", "dst": "b"}) is None
-    assert "overwrite" in (
-        classify_danger("copy_path", {"src": "a", "dst": "b", "overwrite": True}) or ""
-    )
+    assert "overwrite" in (classify_danger("copy_path", {"src": "a", "dst": "b", "overwrite": True}) or "")
 
 
 def test_classify_write_file_overwrite(workspace: object) -> None: