core/agent: let YOLO mode skip YOLO-tagged soft confirms

`--yes` / `/yolo on|off|once` clears the prompt of a `YOLO`-tagged tool: interpreter runs (`run_argv`, `run_argv_batch`, `open_pty`), the file mutations (overwrite / copy / move / delete) and `fetch_local`'s cleartext and mutating requests. A tool without the tag still asks, and hard path/command denylists stay untouched.

`classify_danger` now answers with a `DangerReason` — the reason text plus `yolo_skip` — so one call can refuse that skip: a command that runs through `sudo` / `su` / `doas` / `pkexec` (as the program or a wrapper) keeps its confirm whatever YOLO mode says. It never adds a reason of its own, so the program the denylist gate already asks about is not asked twice.

`prepare_batch_confirm` leaves the covered calls out, so a skipped call neither prompts on its own nor takes a slot in the round's aggregated prompt, and one escalating step keeps the whole batch in front of the human.

src/plyngent/agent/__init__.py

@@ -30,6 +30,7 @@ from .notices import skill_tools_notice as skill_tools_notice
 from .notices import truncated_turn_notice as truncated_turn_notice
 from .tools import BatchConfirmDecision as BatchConfirmDecision
 from .tools import DangerClassifier as DangerClassifier
+from .tools import DangerReason as DangerReason
 from .tools import ToolBatchConfirmHook as ToolBatchConfirmHook
 from .tools import ToolConfirmHook as ToolConfirmHook
 from .tools import ToolConfirmRequest as ToolConfirmRequest

src/plyngent/agent/tools.py

@@ -16,8 +16,22 @@ from msgspec import Struct
 from plyngent.lmproto.openai_compatible.model import ChatImagePart, ToolFunction, ToolFunctionItem
 from plyngent.typedef import JSONSchema  # noqa: TC001
 
+
+@dataclass(frozen=True, slots=True)
+class DangerReason:
+    """Why a call needs a soft confirm, and whether YOLO mode may drop that prompt.
+
+    ``yolo_skip`` is false for a call that reaches rights the session does not
+    have (``sudo`` / ``doas`` / ``pkexec`` and friends): the human answers it
+    however YOLO mode is set.
+    """
+
+    text: str
+    yolo_skip: bool = True
+
+
 type ToolHandler = Callable[..., Any | Awaitable[Any]]
-type DangerClassifier = Callable[[str, Mapping[str, object]], str | None]
+type DangerClassifier = Callable[[str, Mapping[str, object]], str | DangerReason | None]
 # Returns True to allow, False to deny, or a non-empty str as denial reason for the model.
 type ToolConfirmResult = bool | str
 type ToolConfirmHook = Callable[
@@ -313,6 +327,13 @@ def _denied_error(name: str, reason: str, comment: str | None) -> str:
     return f"error: tool {name!r} denied by user confirm ({reason})"
 
 
+def _as_danger_reason(raw: str | DangerReason | None) -> DangerReason | None:
+    """Normalize a classifier answer; a bare string is a reason YOLO mode may drop."""
+    if raw is None:
+        return None
+    return raw if isinstance(raw, DangerReason) else DangerReason(text=raw)
+
+
 def _write_path_key(value: str) -> str:
     """Comparable key for one path argument of a writing tool.
 
@@ -559,7 +580,9 @@ class ToolRegistry:
 
         Mirrors the front half of :meth:`execute`: a call whose arguments fail to
         decode or miss a required argument is answered with an error there and
-        must not be put in front of the user now.
+        must not be put in front of the user now, and a call whose reason YOLO
+        mode covers runs unprompted, so it must not take a slot in the round's
+        aggregated prompt either.
         """
         definition = self._tools.get(name)
         if self._danger is None or definition is None:
@@ -567,8 +590,10 @@ class ToolRegistry:
         args = _decode_tool_args(arguments_json)
         if isinstance(args, str) or _missing_required_error(definition, args) is not None:
             return None
-        reason = self._danger(name, args)
+        reason = _as_danger_reason(self._danger(name, args))
-        return None if reason is None else ToolConfirmRequest(name=name, args=args, reason=reason)
+        if reason is None or (self._yolo and (definition.tags & ToolTag.YOLO) and reason.yolo_skip):
+            return None
+        return ToolConfirmRequest(name=name, args=args, reason=reason.text)
 
     def _batch_requests(
         self,
@@ -633,29 +658,32 @@ class ToolRegistry:
         tags: ToolTag,
         decision: BatchConfirmDecision | None = None,
     ) -> str | None:
-        """Soft-confirm gate driven by danger reason + tags + grants.
+        """Soft-confirm gate driven by danger reason + tags + grants + YOLO.
 
         Pipeline (soft gate only; hard denylists stay in tool handlers)::
 
             no soft reason → run
+            YOLO mode, (tags & YOLO) and a reason it may drop → allow
             batch decision for this call → apply it
             (tags & TRUSTABLE) and grant exists → allow
-            else → on_confirm (decorator YOLO tag does not override
+            else → on_confirm (a tool without the YOLO tag, or a reason YOLO
-                   dangerous invocations — internal danger classification
+                   may not drop — a privilege escalation — still prompts
-                   always takes precedence)
+                   under YOLO mode)
         """
         if self._danger is None:
             return None
-        reason = self._danger(name, args)
+        reason = _as_danger_reason(self._danger(name, args))
         if reason is None:
             return None
+        if self._yolo and (tags & ToolTag.YOLO) and reason.yolo_skip:
+            return None
 
         async with self._confirm_lock:
             if decision is not None:
-                return await self._apply_batch_decision(name, reason, decision, tags=tags)
+                return await self._apply_batch_decision(name, reason.text, decision, tags=tags)
             if self._grant_allows(name, tags=tags):
                 return None
-            return await self._prompt_soft_confirm(name, args, reason, tags=tags)
+            return await self._prompt_soft_confirm(name, args, reason.text, tags=tags)
 
     async def execute(
         self,

src/plyngent/tools/command_scan.py

@@ -16,7 +16,16 @@ from typing import TYPE_CHECKING
 if TYPE_CHECKING:
     from collections.abc import Sequence
 
-__all__ = ["CommandString", "UnwrappedCommand", "basename", "is_interpreter", "unwrap_command"]
+__all__ = [
+    "ESCALATION_PROGRAMS",
+    "CommandString",
+    "UnwrappedCommand",
+    "basename",
+    "dash_c_code",
+    "escalators_in_chain",
+    "is_interpreter",
+    "unwrap_command",
+]
 
 # Wrappers that run the program named on their own command line.
 _ENV_WRAPPERS: frozenset[str] = frozenset(
@@ -99,6 +108,10 @@ _INTERPRETERS: frozenset[str] = frozenset(
 # Trailing version of an interpreter: ``python3.12`` / ``node20`` / ``php8.2``.
 _VERSION_SUFFIX = re.compile(r"[0-9][0-9.]*$")
 
+# Privilege escalation: these run with rights the session itself does not have,
+# so a call that reaches one is never approved on the caller's behalf
+# (``danger._command_reason`` keeps the confirm whatever YOLO mode says).
+ESCALATION_PROGRAMS: frozenset[str] = frozenset({"doas", "pkexec", "run0", "su", "sudo", "systemd-run"})
 # ``FOO=bar`` in front of a program (env/sudo style).
 _ASSIGNMENT = re.compile(r"[A-Za-z_][A-Za-z0-9_]*=")
 
@@ -245,6 +258,31 @@ def is_interpreter(base: str) -> bool:
     return base in _INTERPRETERS or _VERSION_SUFFIX.sub("", base) in _INTERPRETERS
 
 
+def dash_c_code(command: Sequence[str]) -> tuple[int, str] | None:
+    """Index and text of the ``-c`` code in an interpreter argv, if present.
+
+    Only interpreters hand ``-c`` a block of code; for anything else it is a
+    plain flag (``grep -c``, ``od -c``) with nothing to review.
+    """
+    for index, part in enumerate(command[1:], start=1):
+        if part == "-c":
+            return index, command[index + 1] if index + 1 < len(command) else ""
+        # Combined short forms are uncommon; only exact -c is supported.
+    return None
+
+
+def escalators_in_chain(argv: Sequence[str]) -> tuple[str, ...]:
+    """Escalation programs *argv* runs: the program itself or a wrapper around it.
+
+    ``sudo -u root python …`` and ``doas bash`` both count, whatever program they
+    finally run. Code an interpreter only carries as text is out of scope here —
+    this reads the command line, not what the text would do.
+    """
+    scan = unwrap_command(argv)
+    names = (scan.base, *scan.wrappers)
+    return tuple(dict.fromkeys(name for name in names if name in ESCALATION_PROGRAMS))
+
+
 def unwrap_command(argv: Sequence[str]) -> UnwrappedCommand:
     """Resolve *argv* to the program behind any wrappers and ``run`` launchers.
 

src/plyngent/tools/danger.py

@@ -4,7 +4,8 @@ import json
 import shlex
 from typing import TYPE_CHECKING, cast
 
-from plyngent.tools.command_scan import is_interpreter, unwrap_command
+from plyngent.agent.tools import DangerReason
+from plyngent.tools.command_scan import dash_c_code, escalators_in_chain, is_interpreter, unwrap_command
 from plyngent.tools.workspace import AccessMode, WorkspaceError, resolve_path
 
 if TYPE_CHECKING:
@@ -23,19 +24,6 @@ def _as_argv(args: Mapping[str, object], *, key: str = "command") -> list[str] |
     return out
 
 
-def _dash_c_code(command: Sequence[str]) -> tuple[int, str] | None:
-    """Index and text of the ``-c`` code in an interpreter argv, if present.
-
-    Only interpreters hand ``-c`` a block of code; for anything else it is a
-    plain flag (``grep -c``, ``od -c``) with nothing to review.
-    """
-    for index, part in enumerate(command[1:], start=1):
-        if part == "-c":
-            return index, command[index + 1] if index + 1 < len(command) else ""
-        # Combined short forms are uncommon; only exact -c is supported.
-    return None
-
-
 def _indent_block(text: str, *, prefix: str = "  ") -> str:
     """Indent every line of *text* (for multi-line -c code in confirm prompts)."""
     if not text:
@@ -51,7 +39,7 @@ def _format_argv_for_confirm(argv: Sequence[str], *, code_index: int | None) ->
     return shlex.join(parts)
 
 
-def _command_reason(argv: Sequence[str], *, via: str) -> str | None:
+def _command_reason(argv: Sequence[str], *, via: str) -> DangerReason | None:
     """Confirm a command that runs code or detaches, whatever wraps it.
 
     Multi-line reason (shown inside the CLI confirm box). ``via`` is a short
@@ -65,6 +53,11 @@ def _command_reason(argv: Sequence[str], *, via: str) -> str | None:
     (``env -S "…"``, ``su -c "…"``) hides code the same way, so it is confirmed
     too, with the text it carries printed under its own ``<wrapper> <option>:``
     label.
+
+    A command that escalates privileges (``sudo``/``doas``/``pkexec`` as the
+    program or a wrapper) is confirmed with ``yolo_skip=False``. It never adds a
+    reason of its own: the denylist gate in the handler always asks about the
+    escalation, so a second prompt here would only repeat it.
     """
     scan = unwrap_command(argv)
     interpreter = is_interpreter(scan.base)
@@ -75,7 +68,10 @@ def _command_reason(argv: Sequence[str], *, via: str) -> str | None:
     findings = list(dict.fromkeys(findings))
     if not findings:
         return None
-    code = _dash_c_code(scan.command) if interpreter else None
+    escalators = escalators_in_chain(argv)
+    if escalators:
+        findings.append(f"privilege escalation {', '.join(escalators)}")
+    code = dash_c_code(scan.command) if interpreter else None
     code_index = scan.offset + code[0] if code is not None else None
     display = _format_argv_for_confirm(argv, code_index=code_index)
     reason = f"{via}: {' + '.join(findings)} — review before allow\n  argv: {display}"
@@ -83,7 +79,7 @@ def _command_reason(argv: Sequence[str], *, via: str) -> str | None:
         reason += f"\n  command:\n{_indent_block(code[1])}"
     for span in scan.command_strings:
         reason += f"\n  {span.label}:\n{_indent_block(span.text)}"
-    return reason
+    return DangerReason(text=reason, yolo_skip=not escalators)
 
 
 def _write_file_reason(args: Mapping[str, object]) -> str | None:
@@ -139,7 +135,7 @@ def _delete_path_reason(args: Mapping[str, object]) -> str | None:
     return f"delete path {path!r}{extra}"
 
 
-def _run_argv_reason(args: Mapping[str, object]) -> str | None:
+def _run_argv_reason(args: Mapping[str, object]) -> DangerReason | None:
     argv = _as_argv(args, key="argv")
     if argv is None:
         return None
@@ -161,8 +157,12 @@ def _batch_step_argv(item: object) -> list[str] | None:
     return parts or None
 
 
-def _run_argv_batch_reason(args: Mapping[str, object]) -> str | None:
+def _run_argv_batch_reason(args: Mapping[str, object]) -> DangerReason | None:
-    """One confirm for the whole batch if any step runs code or detaches."""
+    """One confirm for the whole batch if any step runs code or detaches.
+
+    YOLO mode may drop it only when every step's reason allows that, so one
+    escalating step keeps the whole batch in front of the human.
+    """
     raw = args.get("steps")
     if isinstance(raw, str):
         try:
@@ -181,10 +181,13 @@ def _run_argv_batch_reason(args: Mapping[str, object]) -> str | None:
     if not risky:
         return None
     header = f"run_argv_batch: {len(risky)} risky step(s) (review before allow)"
-    return header + "\n" + "\n".join(risky)
+    return DangerReason(
+        text=header + "\n" + "\n".join(reason.text for reason in risky),
+        yolo_skip=all(reason.yolo_skip for reason in risky),
+    )
 
 
-def _open_pty_reason(args: Mapping[str, object]) -> str | None:
+def _open_pty_reason(args: Mapping[str, object]) -> DangerReason | None:
     argv = _as_argv(args)
     if argv is None:
         return None
@@ -204,14 +207,18 @@ def _fetch_reason(args: Mapping[str, object]) -> str | None:
     return fetch_soft_reason(method, url, body)
 
 
-def classify_danger(name: str, args: Mapping[str, object]) -> str | None:  # noqa: PLR0911
+def classify_danger(name: str, args: Mapping[str, object]) -> str | DangerReason | None:  # noqa: PLR0911
-    """Return a short reason if ``name``/``args`` need user confirm, else ``None``.
+    """Return why ``name``/``args`` need a user confirm, else ``None``.
 
     Hard denylists (paths/commands) still raise independently. This only covers
     soft confirms for mutating tools and risky command launches — interpreters
     (however invoked) and detached runners such as ``nohup``, resolved past
     environment wrappers and ``<launcher> run``.
     Private/loopback fetch_local targets use a separate policy grant (not YOLO).
+
+    A reason also says whether YOLO mode may drop its prompt
+    (:attr:`DangerReason.yolo_skip`); a command that escalates privileges
+    refuses.
     """
     if name == "delete_path":
         return _delete_path_reason(args)

tests/test_agent/test_tools_batch_confirm.py

@@ -93,6 +93,46 @@ async def test_round_asks_once_for_many_mutating_calls() -> None:
     assert single_prompts == []
 
 
+async def test_yolo_calls_are_left_out_of_the_prompt() -> None:
+    """Under YOLO mode a YOLO-tagged call runs unprompted, batch prompt included."""
+    batch_prompts: list[list[str]] = []
+    single_prompts: list[str] = []
+
+    @tool(tags=ToolTag.LOCAL | ToolTag.YOLO, register=False)
+    async def yolo_ok(path: str) -> str:
+        return f"stamped {path}"
+
+    @tool(tags=ToolTag.LOCAL, register=False)
+    async def always_ask(path: str) -> str:
+        return f"stamped {path}"
+
+    def on_batch(requests: Sequence[ToolConfirmRequest]) -> BatchConfirmDecision:
+        batch_prompts.append([request.name for request in requests])
+        return BatchConfirmDecision(allowed=True)
+
+    async def on_single(name: str, _args: Mapping[str, object], _reason: str) -> bool:
+        single_prompts.append(name)
+        return True
+
+    reg = ToolRegistry(
+        [yolo_ok, always_ask],
+        danger=_danger,
+        on_confirm=on_single,
+        on_confirm_batch=on_batch,
+        yolo=True,
+    )
+    calls = [("yolo_ok", '{"path": "a"}'), ("always_ask", '{"path": "b"}'), ("always_ask", '{"path": "c"}')]
+    decisions = await reg.prepare_batch_confirm(calls)
+
+    assert decisions[0] is None
+    assert batch_prompts == [["always_ask", "always_ask"]]
+    results = [
+        await reg.execute(name, arguments, decision=decisions[index]) for index, (name, arguments) in enumerate(calls)
+    ]
+    assert results == ["stamped a", "stamped b", "stamped c"]
+    assert single_prompts == []
+
+
 async def test_single_request_keeps_the_one_call_prompt() -> None:
     """One mutating call stays the plain per-call confirm."""
     batch_prompts: list[int] = []

tests/test_cli/test_repl_commands.py

@@ -486,8 +486,8 @@ async def test_yolo_rebuilds_tool_registry(tmp_path: Path) -> None:
     )
     try:
         assert st.agent.tools is not None
-        # Soft-confirm hooks stay installed; YOLO mode does not bypass
+        # Soft-confirm hooks stay installed; YOLO mode only auto-approves the
-        # dangerous invocations — internal danger classification takes precedence.
+        # confirms of YOLO-tagged tools, so the others still prompt.
         assert st.agent.tools.soft_confirm is True
         assert st.agent.tools.yolo is False
         st.set_yolo("on")

tests/test_tools/test_command_scan.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from plyngent.tools.command_scan import basename, is_interpreter, unwrap_command
+from plyngent.tools.command_scan import basename, escalators_in_chain, is_interpreter, unwrap_command
 
 
 def test_basename() -> None:
@@ -9,6 +9,15 @@ def test_basename() -> None:
     assert basename("pdm") == "pdm"
 
 
+def test_escalators_in_chain() -> None:
+    assert escalators_in_chain(["sudo", "-u", "root", "python", "-c", "print(1)"]) == ("sudo",)
+    assert escalators_in_chain(["env", "FOO=1", "doas", "id"]) == ("doas",)
+    assert escalators_in_chain(["pdm", "run", "sudo", "id"]) == ("sudo",)
+    # Only the command line counts: the code an interpreter carries is not read.
+    assert escalators_in_chain(["bash", "-c", "sudo id"]) == ()
+    assert escalators_in_chain(["grep", "-c", "sudo", "notes.txt"]) == ()
+
+
 def test_unwrap_plain_command() -> None:
     scan = unwrap_command(["grep", "-c", "needle", "f.txt"])
     assert scan.wrappers == ()

tests/test_tools/test_confirm_tags.py

@@ -2,18 +2,18 @@
 
 from __future__ import annotations
 
-from plyngent.agent import ToolRegistry, ToolTag, tool
+from plyngent.agent import DangerReason, ToolRegistry, ToolTag, tool
 from plyngent.tools.context import SessionState, bind_tool_context
 from plyngent.tools.grants import clear_grants, has_grant, hydrate_grants, persist_grants
 from plyngent.tools.view import MemoryViewStore, session_data_view
 
 
-async def test_danger_overrides_yolo_tag() -> None:
+async def test_yolo_only_skips_yolo_tagged_tools() -> None:
-    """Decorator YOLO tag does not bypass confirm when danger flags the call."""
+    """YOLO mode auto-approves the soft confirms of YOLO-tagged tools only."""
     calls: list[str] = []
 
     @tool(tags=ToolTag.LOCAL | ToolTag.YOLO, register=False)
-    async def yolo_tool() -> str:
+    async def yolo_ok() -> str:
         return "y"
 
     @tool(tags=ToolTag.LOCAL, register=False)
@@ -28,15 +28,55 @@ async def test_danger_overrides_yolo_tag() -> None:
         return True
 
     reg = ToolRegistry(
-        [yolo_tool, no_yolo],
+        [yolo_ok, no_yolo],
         danger=danger,
         on_confirm=confirm,
         yolo=True,
     )
-    assert await reg.execute("yolo_tool", "{}") == "y"
+    assert await reg.execute("yolo_ok", "{}") == "y"
-    assert calls == ["yolo_tool"]
+    assert calls == []
     assert await reg.execute("no_yolo", "{}") == "n"
-    assert calls == ["yolo_tool", "no_yolo"]
+    assert calls == ["no_yolo"]
+
+
+async def test_yolo_off_keeps_the_yolo_tagged_prompt() -> None:
+    """The YOLO tag is a policy bit: with YOLO off the call still asks."""
+    calls: list[str] = []
+
+    @tool(tags=ToolTag.LOCAL | ToolTag.YOLO, register=False)
+    async def yolo_ok() -> str:
+        return "y"
+
+    def danger(_name: str, _args: object) -> str | None:
+        return "soft reason"
+
+    async def confirm(name: str, _args: object, _reason: str) -> bool:
+        calls.append(name)
+        return True
+
+    reg = ToolRegistry([yolo_ok], danger=danger, on_confirm=confirm, yolo=False)
+    assert await reg.execute("yolo_ok", "{}") == "y"
+    assert calls == ["yolo_ok"]
+
+
+async def test_yolo_keeps_a_reason_that_refuses_the_skip() -> None:
+    """`DangerReason(yolo_skip=False)` — a privilege escalation — still prompts."""
+    seen: list[str] = []
+
+    @tool(tags=ToolTag.LOCAL | ToolTag.YOLO, register=False)
+    async def escalated() -> str:
+        return "x"
+
+    def danger(_name: str, _args: object) -> DangerReason:
+        return DangerReason("interpreter 'python' + privilege escalation sudo", yolo_skip=False)
+
+    async def confirm(_name: str, _args: object, reason: str) -> bool:
+        seen.append(reason)
+        return True
+
+    reg = ToolRegistry([escalated], danger=danger, on_confirm=confirm, yolo=True)
+    assert await reg.execute("escalated", "{}") == "x"
+    assert seen == ["interpreter 'python' + privilege escalation sudo"]
 
 
 async def test_trustable_grant_once() -> None:

tests/test_tools/test_danger.py

@@ -2,19 +2,35 @@ from __future__ import annotations
 
 from pathlib import Path
 
+from plyngent.agent import DangerReason
 from plyngent.tools.danger import classify_danger
 
 
+def _reason(name: str, args: dict[str, object]) -> str | None:
+    """Confirm text of a classifier answer (``None`` when the call needs none)."""
+    found = classify_danger(name, args)
+    if found is None:
+        return None
+    return found if isinstance(found, str) else found.text
+
+
+def _danger(name: str, args: dict[str, object]) -> DangerReason:
+    """Classifier answer as a typed reason (the call must need a confirm)."""
+    found = classify_danger(name, args)
+    assert isinstance(found, DangerReason), found
+    return found
+
+
 def test_classify_delete_and_move() -> None:
-    assert classify_danger("delete_path", {"path": "a.txt"}) == "delete path 'a.txt'"
+    assert _reason("delete_path", {"path": "a.txt"}) == "delete path 'a.txt'"
-    assert "recursively" in (classify_danger("delete_path", {"path": "d", "recursive": True}) or "")
+    assert "recursively" in (_reason("delete_path", {"path": "d", "recursive": True}) or "")
-    assert "move" in (classify_danger("move_path", {"src": "a", "dst": "b"}) or "")
+    assert "move" in (_reason("move_path", {"src": "a", "dst": "b"}) or "")
 
 
 def test_classify_copy() -> None:
     # Without overwrite flag, copy is not soft-confirmed.
-    assert classify_danger("copy_path", {"src": "a", "dst": "b"}) is None
+    assert _reason("copy_path", {"src": "a", "dst": "b"}) is None
-    assert classify_danger("copy_path", {"src": "a", "dst": "b", "overwrite": False}) is None
+    assert _reason("copy_path", {"src": "a", "dst": "b", "overwrite": False}) is None
 
 
 def test_classify_write_overwrite_only(tmp_path: Path) -> None:
@@ -25,35 +41,35 @@ def test_classify_write_overwrite_only(tmp_path: Path) -> None:
     with bind_instance(instance):
         _ = set_workspace_root(tmp_path)
         # New file: no soft-confirm, with or without the overwrite flag
-        assert classify_danger("write_file", {"path": "new.txt"}) is None
+        assert _reason("write_file", {"path": "new.txt"}) is None
-        assert classify_danger("write_file", {"path": "new.txt", "overwrite": True}) is None
+        assert _reason("write_file", {"path": "new.txt", "overwrite": True}) is None
         # Partial edits: never soft-confirm
-        assert classify_danger("edit_replace", {"path": "x.txt"}) is None
+        assert _reason("edit_replace", {"path": "x.txt"}) is None
-        assert classify_danger("edit_lineno", {"path": "x.txt", "start_line": 1, "end_line": 2}) is None
+        assert _reason("edit_lineno", {"path": "x.txt", "start_line": 1, "end_line": 2}) is None
         # Existing file: only an explicit overwrite asks; an unset/false flag is
         # refused inside the tool, so no prompt may fire for it.
         (tmp_path / "x.txt").write_text("old", encoding="utf-8")
-        assert classify_danger("write_file", {"path": "x.txt"}) is None
+        assert _reason("write_file", {"path": "x.txt"}) is None
-        assert classify_danger("write_file", {"path": "x.txt", "overwrite": False}) is None
+        assert _reason("write_file", {"path": "x.txt", "overwrite": False}) is None
-        reason = classify_danger("write_file", {"path": "x.txt", "overwrite": True})
+        reason = _reason("write_file", {"path": "x.txt", "overwrite": True})
         assert reason is not None and "overwrite" in reason
         (tmp_path / "dst.txt").write_text("d", encoding="utf-8")
         (tmp_path / "src.txt").write_text("s", encoding="utf-8")
-        assert classify_danger("copy_path", {"src": "src.txt", "dst": "dst.txt", "overwrite": False}) is None
+        assert _reason("copy_path", {"src": "src.txt", "dst": "dst.txt", "overwrite": False}) is None
-        creason = classify_danger("copy_path", {"src": "src.txt", "dst": "dst.txt", "overwrite": True})
+        creason = _reason("copy_path", {"src": "src.txt", "dst": "dst.txt", "overwrite": True})
         assert creason is not None and "overwrite" in creason
 
 
 def test_classify_safe_tools() -> None:
-    assert classify_danger("read_file", {"path": "a"}) is None
+    assert _reason("read_file", {"path": "a"}) is None
-    assert classify_danger("listdir", {"path": "."}) is None
+    assert _reason("listdir", {"path": "."}) is None
-    assert classify_danger("run_argv", {"argv": ["echo", "hi"]}) is None
+    assert _reason("run_argv", {"argv": ["echo", "hi"]}) is None
-    assert classify_danger("open_pty", {"command": ["true"]}) is None
+    assert _reason("open_pty", {"command": ["true"]}) is None
-    assert classify_danger("run_argv", {"argv": ["ls", "-la"]}) is None
+    assert _reason("run_argv", {"argv": ["ls", "-la"]}) is None
 
 
 def test_classify_run_argv_batch_risky() -> None:
-    reason = classify_danger(
+    reason = _reason(
         "run_argv_batch",
         {
             "steps": [
@@ -66,7 +82,7 @@ def test_classify_run_argv_batch_risky() -> None:
     assert "run_argv_batch" in reason
     assert "risky" in reason or "bash" in reason
     assert (
-        classify_danger(
+        _reason(
             "run_argv_batch",
             {"steps": [{"argv": ["echo", "ok"]}]},
         )
@@ -75,42 +91,42 @@ def test_classify_run_argv_batch_risky() -> None:
 
 
 def test_classify_shell_and_dash_c() -> None:
-    r = classify_danger("run_argv", {"argv": ["bash", "-c", "rm -rf /"]})
+    r = _reason("run_argv", {"argv": ["bash", "-c", "rm -rf /"]})
     assert r is not None
     assert "bash -c" in r
     assert "rm -rf" in r
 
-    r2 = classify_danger("run_argv", {"argv": ["python3", "-c", "print(1)"]})
+    r2 = _reason("run_argv", {"argv": ["python3", "-c", "print(1)"]})
     assert r2 is not None
     assert "python" in r2
     assert "-c" in r2
     assert "print(1)" in r2
 
-    r_py = classify_danger("run_argv", {"argv": ["python", "-c", "import os"]})
+    r_py = _reason("run_argv", {"argv": ["python", "-c", "import os"]})
     assert r_py is not None and "python -c" in r_py
 
-    r3 = classify_danger("open_pty", {"command": ["bash"]})
+    r3 = _reason("open_pty", {"command": ["bash"]})
     assert r3 is not None and "bash" in r3
     assert "interactive" in r3 or "review" in r3
 
-    r4 = classify_danger("open_pty", {"command": ["python3"]})
+    r4 = _reason("open_pty", {"command": ["python3"]})
     assert r4 is not None and "python" in r4
 
-    r5 = classify_danger("open_pty", {"command": ["python3", "-c", "x=1"]})
+    r5 = _reason("open_pty", {"command": ["python3", "-c", "x=1"]})
     assert r5 is not None and "-c" in r5
 
 
 def test_dash_c_means_code_only_for_interpreters() -> None:
     # ``-c`` is a plain flag elsewhere: no code to review, no confirm.
-    assert classify_danger("run_argv", {"argv": ["grep", "-c", "needle", "f.txt"]}) is None
+    assert _reason("run_argv", {"argv": ["grep", "-c", "needle", "f.txt"]}) is None
-    assert classify_danger("run_argv", {"argv": ["od", "-c", "f.bin"]}) is None
+    assert _reason("run_argv", {"argv": ["od", "-c", "f.bin"]}) is None
-    assert classify_danger("run_argv", {"argv": ["sort", "-c", "f.txt"]}) is None
+    assert _reason("run_argv", {"argv": ["sort", "-c", "f.txt"]}) is None
 
 
 def test_interpreter_review_does_not_split_on_dash_c() -> None:
-    script = classify_danger("run_argv", {"argv": ["python", "script.py"]})
+    script = _reason("run_argv", {"argv": ["python", "script.py"]})
-    one_liner = classify_danger("run_argv", {"argv": ["python", "-c", "print(1)"]})
+    one_liner = _reason("run_argv", {"argv": ["python", "-c", "print(1)"]})
-    bare_shell = classify_danger("open_pty", {"command": ["bash"]})
+    bare_shell = _reason("open_pty", {"command": ["bash"]})
     assert script is not None and "interpreter 'python'" in script
     assert one_liner is not None and "interpreter 'python'" in one_liner
     assert bare_shell is not None and "interpreter 'bash'" in bare_shell
@@ -121,7 +137,7 @@ def test_interpreter_review_does_not_split_on_dash_c() -> None:
 
 
 def test_versioned_interpreter_is_still_reviewed() -> None:
-    reason = classify_danger("run_argv", {"argv": ["python3.12", "-c", "import os"]})
+    reason = _reason("run_argv", {"argv": ["python3.12", "-c", "import os"]})
     assert reason is not None and "interpreter 'python3.12'" in reason
     assert "import os" in reason
 
@@ -134,7 +150,7 @@ def test_wrappers_reach_the_interpreter() -> None:
         ["pdm", "run", "python", "-c", "print(1)"],
         ["uv", "run", "--with", "rich", "python", "-c", "print(1)"],
     ):
-        reason = classify_danger("run_argv", {"argv": argv})
+        reason = _reason("run_argv", {"argv": argv})
         assert reason is not None, argv
         assert "interpreter 'python'" in reason or "interpreter 'bash'" in reason
         assert "$(command)" in reason
@@ -142,7 +158,7 @@ def test_wrappers_reach_the_interpreter() -> None:
 
 def test_value_free_flags_do_not_hide_the_interpreter() -> None:
     """``exec -c`` takes no value, so the interpreter behind it is still reviewed."""
-    reason = classify_danger("run_argv", {"argv": ["exec", "-c", "python", "-c", "print(1)"]})
+    reason = _reason("run_argv", {"argv": ["exec", "-c", "python", "-c", "print(1)"]})
     assert reason is not None
     assert "interpreter 'python'" in reason
     assert "print(1)" in reason
@@ -150,26 +166,26 @@ def test_value_free_flags_do_not_hide_the_interpreter() -> None:
 
 def test_wrapper_command_line_option_is_reviewed() -> None:
     """`env -S` / `su -c` carry a command line, so they are confirmed like `-c`."""
-    reason = classify_danger("run_argv", {"argv": ["env", "-S", "rm -rf /"]})
+    reason = _reason("run_argv", {"argv": ["env", "-S", "rm -rf /"]})
     assert reason is not None
     assert "env -S runs a command line" in reason
     assert "  env -S:\n  rm -rf /" in reason
 
     # Plain wrapper options are not a review trigger.
-    assert classify_danger("run_argv", {"argv": ["env", "-u", "FOO=1", "git", "status"]}) is None
+    assert _reason("run_argv", {"argv": ["env", "-u", "FOO=1", "git", "status"]}) is None
-    assert classify_danger("run_argv", {"argv": ["env", "FOO=1", "git", "-c", "x=y", "log"]}) is None
+    assert _reason("run_argv", {"argv": ["env", "FOO=1", "git", "-c", "x=y", "log"]}) is None
 
 
 def test_wrapper_command_line_value_needs_no_interpreter() -> None:
     """The wrapper's value is reviewed even when no interpreter is resolved."""
-    reason = classify_danger("run_argv", {"argv": ["env", "-S", "python -O script.py"]})
+    reason = _reason("run_argv", {"argv": ["env", "-S", "python -O script.py"]})
     assert reason is not None
     assert "env -S runs a command line" in reason
     assert "python -O script.py" in reason
 
 
 def test_only_the_interpreter_dash_c_becomes_a_placeholder() -> None:
-    reason = classify_danger("run_argv", {"argv": ["ionice", "-c", "2", "python", "-c", "print(1)"]})
+    reason = _reason("run_argv", {"argv": ["ionice", "-c", "2", "python", "-c", "print(1)"]})
     assert reason is not None
     argv_line = next(line for line in reason.splitlines() if line.startswith("  argv:"))
     assert "ionice -c 2" in argv_line
@@ -178,15 +194,43 @@ def test_only_the_interpreter_dash_c_becomes_a_placeholder() -> None:
 
 
 def test_detached_runner_is_always_reviewed() -> None:
-    assert classify_danger("run_argv", {"argv": ["sleep", "5"]}) is None
+    assert _reason("run_argv", {"argv": ["sleep", "5"]}) is None
-    reason = classify_danger("run_argv", {"argv": ["nohup", "sleep", "5"]})
+    reason = _reason("run_argv", {"argv": ["nohup", "sleep", "5"]})
     assert reason is not None and "nohup (detached run)" in reason
-    nested = classify_danger("run_argv", {"argv": ["nohup", "python", "-c", "print(1)"]})
+    nested = _reason("run_argv", {"argv": ["nohup", "python", "-c", "print(1)"]})
     assert nested is not None
     assert "nohup (detached run)" in nested and "interpreter 'python'" in nested
     assert "print(1)" in nested
 
 
+def test_privilege_escalation_refuses_the_yolo_skip() -> None:
+    """A reason that runs through `sudo`/`doas` keeps its prompt under YOLO mode."""
+    reason = _danger("run_argv", {"argv": ["sudo", "python", "-c", "print(1)"]})
+    assert "interpreter 'python'" in reason.text
+    assert "privilege escalation sudo" in reason.text
+    assert reason.yolo_skip is False
+
+    assert _danger("run_argv", {"argv": ["env", "FOO=1", "doas", "bash", "-c", "ls"]}).yolo_skip is False
+    # A plain interpreter run is still YOLO mode's to drop.
+    assert _danger("run_argv", {"argv": ["bash", "-c", "echo hi"]}).yolo_skip is True
+    # Escalation adds no reason of its own: the denylist gate asks about it.
+    assert classify_danger("run_argv", {"argv": ["sudo", "ls"]}) is None
+
+
+def test_batch_refuses_the_yolo_skip_when_a_step_escalates() -> None:
+    """One escalating step keeps the batch prompt; all-plain steps may be dropped."""
+    mixed = _danger(
+        "run_argv_batch",
+        {"steps": [{"argv": ["bash", "-c", "ls"]}, {"argv": ["sudo", "python", "-c", "print(1)"]}]},
+    )
+    assert mixed.yolo_skip is False
+    plain = _danger(
+        "run_argv_batch",
+        {"steps": [{"argv": ["bash", "-c", "ls"]}, {"argv": ["python", "-c", "print(1)"]}]},
+    )
+    assert plain.yolo_skip is True
+
+
 async def test_confirm_deny_with_comment() -> None:
     from plyngent.agent.tools import ToolRegistry, tool
     from plyngent.tools.danger import classify_danger as danger
@@ -208,7 +252,7 @@ async def test_confirm_deny_with_comment() -> None:
 
 def test_shell_confirm_formats_command_placeholder() -> None:
     script = chr(10).join(["line1", "line2", "line3"])
-    reason = classify_danger(
+    reason = _reason(
         "run_argv",
         {"argv": ["bash", "-c", script]},
     )

tests/test_tools/test_fetch_local.py

@@ -184,9 +184,9 @@ def test_soft_confirm_reason_matrix() -> None:
 def test_classify_danger_fetch() -> None:
     assert classify_danger("fetch_local", {"url": "https://example.com/", "method": "GET"}) is None
     reason = classify_danger("fetch_local", {"url": "http://example.com/", "method": "GET"})
-    assert reason is not None and "cleartext" in reason
+    assert isinstance(reason, str) and "cleartext" in reason
     reason2 = classify_danger("fetch_local", {"url": "https://example.com/api", "method": "DELETE"})
-    assert reason2 is not None and "DELETE" in reason2
+    assert isinstance(reason2, str) and "DELETE" in reason2
 
 
 async def test_fetch_get_post_put_delete(workspace: Path, http_server: str) -> None: