refactor(agents): move permissions to app/agents/shared (slice 4a)

Relocate the permission evaluator (wildcard matcher + rule evaluation) to the
shared kernel and flip 43 non-frozen importers. A re-export shim remains at
new_chat/permissions.py for the frozen single-agent stack (chat_deepagent and
subagents/{config,providers/linear,providers/slack}); it will be removed when
that stack is retired.

surfsense_backend/app/agents/multi_agent_chat/middleware/shared/permissions/ask/payload.py

@@ -13,7 +13,7 @@ from app.agents.multi_agent_chat.subagents.shared.hitl.wire import (
     SURFSENSE_DECISION_APPROVE_ALWAYS,
     build_lc_hitl_payload,
 )
-from app.agents.new_chat.permissions import Rule
+from app.agents.shared.permissions import Rule
 
 PERMISSION_ASK_INTERRUPT_TYPE = "permission_ask"
 

surfsense_backend/app/agents/multi_agent_chat/middleware/shared/permissions/ask/request.py

@@ -16,7 +16,7 @@ from typing import Any
 from langchain_core.tools import BaseTool
 from langgraph.types import interrupt
 
-from app.agents.new_chat.permissions import Rule
+from app.agents.shared.permissions import Rule
 from app.observability import metrics as ot_metrics, otel as ot
 
 from .decision import normalize_permission_decision

surfsense_backend/app/agents/multi_agent_chat/middleware/shared/permissions/deny.py

@@ -12,7 +12,7 @@ from typing import Any
 from langchain_core.messages import ToolMessage
 
 from app.agents.shared.errors import StreamingError
-from app.agents.new_chat.permissions import Rule
+from app.agents.shared.permissions import Rule
 
 
 def build_deny_message(tool_call: dict[str, Any], rule: Rule) -> ToolMessage:

surfsense_backend/app/agents/multi_agent_chat/middleware/shared/permissions/middleware/core.py

@@ -27,7 +27,7 @@ from langchain_core.tools import BaseTool
 from langgraph.runtime import Runtime
 
 from app.agents.shared.errors import CorrectedError, RejectedError
-from app.agents.new_chat.permissions import Ruleset
+from app.agents.shared.permissions import Ruleset
 from app.services.user_tool_allowlist import TrustedToolSaver
 
 from ..ask.edit import merge_edited_args

surfsense_backend/app/agents/multi_agent_chat/middleware/shared/permissions/middleware/evaluation.py

@@ -16,7 +16,7 @@ from __future__ import annotations
 import logging
 from typing import Any
 
-from app.agents.new_chat.permissions import (
+from app.agents.shared.permissions import (
     Rule,
     RuleAction,
     Ruleset,

surfsense_backend/app/agents/multi_agent_chat/middleware/shared/permissions/middleware/factory.py

@@ -28,7 +28,7 @@ from collections.abc import Sequence
 from langchain_core.tools import BaseTool
 
 from app.agents.shared.feature_flags import AgentFeatureFlags
-from app.agents.new_chat.permissions import Rule, Ruleset
+from app.agents.shared.permissions import Rule, Ruleset
 from app.services.user_tool_allowlist import TrustedToolSaver
 
 from .core import PermissionMiddleware

surfsense_backend/app/agents/multi_agent_chat/middleware/shared/permissions/middleware/ruleset_view.py

@@ -9,7 +9,7 @@ newly-promoted rules apply to subsequent calls.
 
 from __future__ import annotations
 
-from app.agents.new_chat.permissions import Ruleset, aggregate_action, evaluate_many
+from app.agents.shared.permissions import Ruleset, aggregate_action, evaluate_many
 
 
 def all_rulesets(

surfsense_backend/app/agents/multi_agent_chat/middleware/shared/permissions/middleware/runtime_promote.py

@@ -7,7 +7,7 @@ is the streaming layer's job — this module keeps the in-memory copy only.
 
 from __future__ import annotations
 
-from app.agents.new_chat.permissions import Rule, Ruleset
+from app.agents.shared.permissions import Rule, Ruleset
 
 
 def persist_always(

surfsense_backend/app/agents/multi_agent_chat/subagents/builtins/deliverables/tools/index.py

@@ -9,7 +9,7 @@ from typing import Any
 
 from langchain_core.tools import BaseTool
 
-from app.agents.new_chat.permissions import Ruleset
+from app.agents.shared.permissions import Ruleset
 
 from .generate_image import create_generate_image_tool
 from .podcast import create_generate_podcast_tool

surfsense_backend/app/agents/multi_agent_chat/subagents/builtins/knowledge_base/agent.py

@@ -15,7 +15,7 @@ from langchain_core.tools import BaseTool
 
 from app.agents.multi_agent_chat.subagents.shared.spec import SurfSenseSubagentSpec
 from app.agents.shared.filesystem_selection import FilesystemMode
-from app.agents.new_chat.permissions import Rule, Ruleset
+from app.agents.shared.permissions import Rule, Ruleset
 
 from .middleware_stack import build_kb_middleware
 from .prompts import load_description, load_readonly_system_prompt, load_system_prompt

surfsense_backend/app/agents/multi_agent_chat/subagents/builtins/knowledge_base/middleware_stack.py

@@ -30,7 +30,7 @@ from app.agents.multi_agent_chat.middleware.shared.permissions import (
 )
 from app.agents.shared.feature_flags import AgentFeatureFlags
 from app.agents.shared.filesystem_selection import FilesystemMode
-from app.agents.new_chat.permissions import Ruleset
+from app.agents.shared.permissions import Ruleset
 
 
 def _kb_user_allowlist(

surfsense_backend/app/agents/multi_agent_chat/subagents/builtins/memory/tools/index.py

@@ -6,7 +6,7 @@ from typing import Any
 
 from langchain_core.tools import BaseTool
 
-from app.agents.new_chat.permissions import Ruleset
+from app.agents.shared.permissions import Ruleset
 from app.db import ChatVisibility
 
 from .update_memory import create_update_memory_tool, create_update_team_memory_tool

surfsense_backend/app/agents/multi_agent_chat/subagents/builtins/research/tools/index.py

@@ -6,7 +6,7 @@ from typing import Any
 
 from langchain_core.tools import BaseTool
 
-from app.agents.new_chat.permissions import Ruleset
+from app.agents.shared.permissions import Ruleset
 
 from .scrape_webpage import create_scrape_webpage_tool
 from .web_search import create_web_search_tool

surfsense_backend/app/agents/multi_agent_chat/subagents/connectors/airtable/tools/index.py

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from app.agents.new_chat.permissions import Rule, Ruleset
+from app.agents.shared.permissions import Rule, Ruleset
 
 NAME = "airtable"
 

surfsense_backend/app/agents/multi_agent_chat/subagents/connectors/calendar/tools/index.py

@@ -10,7 +10,7 @@ from typing import Any
 
 from langchain_core.tools import BaseTool
 
-from app.agents.new_chat.permissions import Ruleset
+from app.agents.shared.permissions import Ruleset
 
 from .create_event import create_create_calendar_event_tool
 from .delete_event import create_delete_calendar_event_tool

surfsense_backend/app/agents/multi_agent_chat/subagents/connectors/clickup/tools/index.py

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from app.agents.new_chat.permissions import Rule, Ruleset
+from app.agents.shared.permissions import Rule, Ruleset
 
 NAME = "clickup"
 

surfsense_backend/app/agents/multi_agent_chat/subagents/connectors/confluence/tools/index.py

@@ -9,7 +9,7 @@ from typing import Any
 
 from langchain_core.tools import BaseTool
 
-from app.agents.new_chat.permissions import Ruleset
+from app.agents.shared.permissions import Ruleset
 
 from .create_page import create_create_confluence_page_tool
 from .delete_page import create_delete_confluence_page_tool

surfsense_backend/app/agents/multi_agent_chat/subagents/connectors/discord/tools/index.py

@@ -9,7 +9,7 @@ from typing import Any
 
 from langchain_core.tools import BaseTool
 
-from app.agents.new_chat.permissions import Ruleset
+from app.agents.shared.permissions import Ruleset
 
 from .list_channels import create_list_discord_channels_tool
 from .read_messages import create_read_discord_messages_tool

surfsense_backend/app/agents/multi_agent_chat/subagents/connectors/dropbox/tools/index.py

@@ -9,7 +9,7 @@ from typing import Any
 
 from langchain_core.tools import BaseTool
 
-from app.agents.new_chat.permissions import Ruleset
+from app.agents.shared.permissions import Ruleset
 
 from .create_file import create_create_dropbox_file_tool
 from .trash_file import create_delete_dropbox_file_tool

surfsense_backend/app/agents/multi_agent_chat/subagents/connectors/gmail/tools/index.py

@@ -9,7 +9,7 @@ from typing import Any
 
 from langchain_core.tools import BaseTool
 
-from app.agents.new_chat.permissions import Ruleset
+from app.agents.shared.permissions import Ruleset
 
 from .create_draft import create_create_gmail_draft_tool
 from .read_email import create_read_gmail_email_tool

surfsense_backend/app/agents/multi_agent_chat/subagents/connectors/google_drive/tools/index.py

@@ -9,7 +9,7 @@ from typing import Any
 
 from langchain_core.tools import BaseTool
 
-from app.agents.new_chat.permissions import Ruleset
+from app.agents.shared.permissions import Ruleset
 
 from .create_file import create_create_google_drive_file_tool
 from .trash_file import create_delete_google_drive_file_tool

surfsense_backend/app/agents/multi_agent_chat/subagents/connectors/jira/tools/index.py

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from app.agents.new_chat.permissions import Rule, Ruleset
+from app.agents.shared.permissions import Rule, Ruleset
 
 NAME = "jira"
 

surfsense_backend/app/agents/multi_agent_chat/subagents/connectors/linear/tools/index.py

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from app.agents.new_chat.permissions import Rule, Ruleset
+from app.agents.shared.permissions import Rule, Ruleset
 
 NAME = "linear"
 

surfsense_backend/app/agents/multi_agent_chat/subagents/connectors/luma/tools/index.py

@@ -9,7 +9,7 @@ from typing import Any
 
 from langchain_core.tools import BaseTool
 
-from app.agents.new_chat.permissions import Ruleset
+from app.agents.shared.permissions import Ruleset
 
 from .create_event import create_create_luma_event_tool
 from .list_events import create_list_luma_events_tool

surfsense_backend/app/agents/multi_agent_chat/subagents/connectors/notion/tools/index.py

@@ -9,7 +9,7 @@ from typing import Any
 
 from langchain_core.tools import BaseTool
 
-from app.agents.new_chat.permissions import Ruleset
+from app.agents.shared.permissions import Ruleset
 
 from .create_page import create_create_notion_page_tool
 from .delete_page import create_delete_notion_page_tool

surfsense_backend/app/agents/multi_agent_chat/subagents/connectors/onedrive/tools/index.py

@@ -9,7 +9,7 @@ from typing import Any
 
 from langchain_core.tools import BaseTool
 
-from app.agents.new_chat.permissions import Ruleset
+from app.agents.shared.permissions import Ruleset
 
 from .create_file import create_create_onedrive_file_tool
 from .trash_file import create_delete_onedrive_file_tool

surfsense_backend/app/agents/multi_agent_chat/subagents/connectors/slack/tools/index.py

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from app.agents.new_chat.permissions import Rule, Ruleset
+from app.agents.shared.permissions import Rule, Ruleset
 
 NAME = "slack"
 

surfsense_backend/app/agents/multi_agent_chat/subagents/connectors/teams/tools/index.py

@@ -9,7 +9,7 @@ from typing import Any
 
 from langchain_core.tools import BaseTool
 
-from app.agents.new_chat.permissions import Ruleset
+from app.agents.shared.permissions import Ruleset
 
 from .list_channels import create_list_teams_channels_tool
 from .read_messages import create_read_teams_messages_tool

surfsense_backend/app/agents/multi_agent_chat/subagents/shared/spec.py

@@ -8,7 +8,7 @@ from typing import Any
 
 from deepagents import SubAgent
 
-from app.agents.new_chat.permissions import Ruleset
+from app.agents.shared.permissions import Ruleset
 
 # A context-hint provider receives the parent-agent ``runtime.state`` mapping
 # and the ``description`` the orchestrator wrote, and returns a short string

surfsense_backend/app/agents/multi_agent_chat/subagents/shared/subagent_builder.py

@@ -22,7 +22,7 @@ from app.agents.multi_agent_chat.subagents.shared.spec import (
     ContextHintProvider,
     SurfSenseSubagentSpec,
 )
-from app.agents.new_chat.permissions import Ruleset
+from app.agents.shared.permissions import Ruleset
 
 logger = logging.getLogger(__name__)
 

surfsense_backend/app/agents/new_chat/middleware/permission.py

@@ -55,7 +55,7 @@ from app.agents.shared.errors import (
     RejectedError,
     StreamingError,
 )
-from app.agents.new_chat.permissions import (
+from app.agents.shared.permissions import (
     Rule,
     Ruleset,
     aggregate_action,

surfsense_backend/app/agents/new_chat/permissions.py

@@ -1,196 +1,22 @@
-"""
-Wildcard pattern matching + rule evaluation for the SurfSense permission system.
+"""Backward-compatible shim.
 
-Ported from OpenCode's ``packages/opencode/src/permission/evaluate.ts`` and
-``packages/opencode/src/util/wildcard.ts``. LangChain has no rule-based
-permission evaluator, so we keep OpenCode's semantics intact:
-
-- ``Wildcard.match`` matches both the ``permission`` and the ``pattern``
-  fields of a rule against the requested ``(permission, pattern)`` pair.
-  ``*`` matches any segment, ``**`` matches across separators.
-- The evaluator runs ``findLast`` over the **flattened** list of rules
-  from all rulesets — last matching rule wins.
-- The default fallback is ``ask`` (NOT deny), matching OpenCode.
-- Multi-pattern requests AND together: if ANY pattern resolves to
-  ``deny``, the whole request is denied; if ANY needs ``ask``, an
-  interrupt is raised; only when all patterns ``allow`` does the
-  request proceed.
+The permission evaluator now lives in the shared agent kernel at
+``app.agents.shared.permissions``. This module re-exports it so frozen
+single-agent code (``chat_deepagent`` and ``subagents/*``) keeps working
+until that stack is retired.
 """
 
 from __future__ import annotations
 
-import re
-from collections.abc import Iterable
-from dataclasses import dataclass, field
-from typing import Literal
-
-RuleAction = Literal["allow", "deny", "ask"]
-
-
-@dataclass(frozen=True)
-class Rule:
-    """A single permission rule.
-
-    Attributes:
-        permission: A wildcard-matched permission identifier
-            (e.g. ``"edit"``, ``"linear_*"``, ``"mcp:*"``,
-            ``"doom_loop"``). Anchored at start AND end of the input.
-        pattern: A wildcard-matched pattern over the request payload
-            (e.g. ``"/documents/secrets/**"``, ``"page_id=123"``,
-            ``"*"``). Anchored at start AND end.
-        action: One of ``"allow"`` / ``"deny"`` / ``"ask"``.
-    """
-
-    permission: str
-    pattern: str
-    action: RuleAction
-
-
-@dataclass
-class Ruleset:
-    """A list of rules with an associated origin used for debugging."""
-
-    rules: list[Rule] = field(default_factory=list)
-    origin: str = "unknown"  # e.g. "defaults", "global", "space", "thread", "runtime"
-
-
-# -----------------------------------------------------------------------------
-# Wildcard matcher
-# -----------------------------------------------------------------------------
-
-
-_GLOB_TOKEN = re.compile(r"\*\*|\*|[^*]+")
-
-
-def _wildcard_to_regex(pattern: str) -> re.Pattern[str]:
-    """Translate an opencode-style wildcard pattern to a compiled regex.
-
-    Rules:
-    - ``**`` matches any sequence of any characters (including separators).
-    - ``*`` matches any sequence of characters that does **not** include
-      the path separator ``/`` — same as glob.
-    - All other characters match literally.
-    - The pattern is anchored at both ends (``^...$``).
-    """
-    parts: list[str] = ["^"]
-    for token in _GLOB_TOKEN.findall(pattern):
-        if token == "**":
-            parts.append(r".*")
-        elif token == "*":
-            parts.append(r"[^/]*")
-        else:
-            parts.append(re.escape(token))
-    parts.append("$")
-    return re.compile("".join(parts))
-
-
-_REGEX_CACHE: dict[str, re.Pattern[str]] = {}
-
-
-def wildcard_match(value: str, pattern: str) -> bool:
-    """Return True if ``value`` matches the wildcard ``pattern``.
-
-    Special case: a bare ``"*"`` pattern matches any value, including
-    those containing ``/`` separators. This mirrors opencode's
-    ``Wildcard.match`` short-circuit and matches the convention that
-    ``pattern="*"`` means "any pattern" in permission rules.
-    """
-    if pattern == "*":
-        return True
-    compiled = _REGEX_CACHE.get(pattern)
-    if compiled is None:
-        compiled = _wildcard_to_regex(pattern)
-        _REGEX_CACHE[pattern] = compiled
-    return compiled.match(value) is not None
-
-
-# -----------------------------------------------------------------------------
-# Evaluator
-# -----------------------------------------------------------------------------
-
-
-def evaluate(
-    permission: str,
-    pattern: str,
-    *rulesets: Ruleset | Iterable[Rule],
-) -> Rule:
-    """Find the last rule matching ``(permission, pattern)`` from ``rulesets``.
-
-    Mirrors opencode ``permission/evaluate.ts:9-15`` precisely:
-    - Flatten rulesets in argument order.
-    - Walk the flat list **in reverse**.
-    - First reverse-match wins (i.e. the last specified rule wins).
-    - When no rule matches, default to ``Rule(permission, "*", "ask")``.
-
-    Args:
-        permission: The permission identifier being requested
-            (e.g. tool name, ``"edit"``, ``"doom_loop"``).
-        pattern: The request-specific pattern (e.g. file path,
-            primary arg value). Use ``"*"`` when no specific pattern
-            applies.
-        *rulesets: Layered rulesets, applied earliest to latest. Later
-            rulesets override earlier ones.
-
-    Returns:
-        The matched :class:`Rule`, or the default ask fallback.
-    """
-    flat: list[Rule] = []
-    for rs in rulesets:
-        if isinstance(rs, Ruleset):
-            flat.extend(rs.rules)
-        else:
-            flat.extend(rs)
-
-    for rule in reversed(flat):
-        if wildcard_match(permission, rule.permission) and wildcard_match(
-            pattern, rule.pattern
-        ):
-            return rule
-
-    return Rule(permission=permission, pattern="*", action="ask")
-
-
-def evaluate_many(
-    permission: str,
-    patterns: Iterable[str],
-    *rulesets: Ruleset | Iterable[Rule],
-) -> list[Rule]:
-    """Evaluate ``permission`` against each of ``patterns`` (multi-pattern AND).
-
-    Returns the list of resolved rules in the same order as ``patterns``.
-    The caller is responsible for combining the results — opencode-style
-    multi-pattern AND collapses ``deny`` first, then ``ask``, then
-    ``allow``.
-    """
-    return [evaluate(permission, p, *rulesets) for p in patterns]
-
-
-def aggregate_action(rules: Iterable[Rule]) -> RuleAction:
-    """Collapse a list of per-pattern rules into one action.
-
-    Order:
-    1. If any rule is ``deny`` -> ``deny``.
-    2. Else if any rule is ``ask`` -> ``ask``.
-    3. Else if at least one rule is ``allow`` -> ``allow``.
-    4. Else (empty input) -> ``ask`` (safe default mirroring ``evaluate``).
-
-    Mirrors opencode's behavior in ``permission/index.ts:180-272``.
-    """
-    saw_ask = False
-    saw_allow = False
-    for rule in rules:
-        if rule.action == "deny":
-            return "deny"
-        if rule.action == "ask":
-            saw_ask = True
-        elif rule.action == "allow":
-            saw_allow = True
-    if saw_ask:
-        return "ask"
-    if saw_allow:
-        return "allow"
-    return "ask"
-
+from app.agents.shared.permissions import (
+    Rule,
+    RuleAction,
+    Ruleset,
+    aggregate_action,
+    evaluate,
+    evaluate_many,
+    wildcard_match,
+)
 
 __all__ = [
     "Rule",

surfsense_backend/app/agents/shared/permissions.py

@@ -0,0 +1,203 @@
+"""
+Wildcard pattern matching + rule evaluation for the SurfSense permission system.
+
+Ported from OpenCode's ``packages/opencode/src/permission/evaluate.ts`` and
+``packages/opencode/src/util/wildcard.ts``. LangChain has no rule-based
+permission evaluator, so we keep OpenCode's semantics intact:
+
+- ``Wildcard.match`` matches both the ``permission`` and the ``pattern``
+  fields of a rule against the requested ``(permission, pattern)`` pair.
+  ``*`` matches any segment, ``**`` matches across separators.
+- The evaluator runs ``findLast`` over the **flattened** list of rules
+  from all rulesets — last matching rule wins.
+- The default fallback is ``ask`` (NOT deny), matching OpenCode.
+- Multi-pattern requests AND together: if ANY pattern resolves to
+  ``deny``, the whole request is denied; if ANY needs ``ask``, an
+  interrupt is raised; only when all patterns ``allow`` does the
+  request proceed.
+"""
+
+from __future__ import annotations
+
+import re
+from collections.abc import Iterable
+from dataclasses import dataclass, field
+from typing import Literal
+
+RuleAction = Literal["allow", "deny", "ask"]
+
+
+@dataclass(frozen=True)
+class Rule:
+    """A single permission rule.
+
+    Attributes:
+        permission: A wildcard-matched permission identifier
+            (e.g. ``"edit"``, ``"linear_*"``, ``"mcp:*"``,
+            ``"doom_loop"``). Anchored at start AND end of the input.
+        pattern: A wildcard-matched pattern over the request payload
+            (e.g. ``"/documents/secrets/**"``, ``"page_id=123"``,
+            ``"*"``). Anchored at start AND end.
+        action: One of ``"allow"`` / ``"deny"`` / ``"ask"``.
+    """
+
+    permission: str
+    pattern: str
+    action: RuleAction
+
+
+@dataclass
+class Ruleset:
+    """A list of rules with an associated origin used for debugging."""
+
+    rules: list[Rule] = field(default_factory=list)
+    origin: str = "unknown"  # e.g. "defaults", "global", "space", "thread", "runtime"
+
+
+# -----------------------------------------------------------------------------
+# Wildcard matcher
+# -----------------------------------------------------------------------------
+
+
+_GLOB_TOKEN = re.compile(r"\*\*|\*|[^*]+")
+
+
+def _wildcard_to_regex(pattern: str) -> re.Pattern[str]:
+    """Translate an opencode-style wildcard pattern to a compiled regex.
+
+    Rules:
+    - ``**`` matches any sequence of any characters (including separators).
+    - ``*`` matches any sequence of characters that does **not** include
+      the path separator ``/`` — same as glob.
+    - All other characters match literally.
+    - The pattern is anchored at both ends (``^...$``).
+    """
+    parts: list[str] = ["^"]
+    for token in _GLOB_TOKEN.findall(pattern):
+        if token == "**":
+            parts.append(r".*")
+        elif token == "*":
+            parts.append(r"[^/]*")
+        else:
+            parts.append(re.escape(token))
+    parts.append("$")
+    return re.compile("".join(parts))
+
+
+_REGEX_CACHE: dict[str, re.Pattern[str]] = {}
+
+
+def wildcard_match(value: str, pattern: str) -> bool:
+    """Return True if ``value`` matches the wildcard ``pattern``.
+
+    Special case: a bare ``"*"`` pattern matches any value, including
+    those containing ``/`` separators. This mirrors opencode's
+    ``Wildcard.match`` short-circuit and matches the convention that
+    ``pattern="*"`` means "any pattern" in permission rules.
+    """
+    if pattern == "*":
+        return True
+    compiled = _REGEX_CACHE.get(pattern)
+    if compiled is None:
+        compiled = _wildcard_to_regex(pattern)
+        _REGEX_CACHE[pattern] = compiled
+    return compiled.match(value) is not None
+
+
+# -----------------------------------------------------------------------------
+# Evaluator
+# -----------------------------------------------------------------------------
+
+
+def evaluate(
+    permission: str,
+    pattern: str,
+    *rulesets: Ruleset | Iterable[Rule],
+) -> Rule:
+    """Find the last rule matching ``(permission, pattern)`` from ``rulesets``.
+
+    Mirrors opencode ``permission/evaluate.ts:9-15`` precisely:
+    - Flatten rulesets in argument order.
+    - Walk the flat list **in reverse**.
+    - First reverse-match wins (i.e. the last specified rule wins).
+    - When no rule matches, default to ``Rule(permission, "*", "ask")``.
+
+    Args:
+        permission: The permission identifier being requested
+            (e.g. tool name, ``"edit"``, ``"doom_loop"``).
+        pattern: The request-specific pattern (e.g. file path,
+            primary arg value). Use ``"*"`` when no specific pattern
+            applies.
+        *rulesets: Layered rulesets, applied earliest to latest. Later
+            rulesets override earlier ones.
+
+    Returns:
+        The matched :class:`Rule`, or the default ask fallback.
+    """
+    flat: list[Rule] = []
+    for rs in rulesets:
+        if isinstance(rs, Ruleset):
+            flat.extend(rs.rules)
+        else:
+            flat.extend(rs)
+
+    for rule in reversed(flat):
+        if wildcard_match(permission, rule.permission) and wildcard_match(
+            pattern, rule.pattern
+        ):
+            return rule
+
+    return Rule(permission=permission, pattern="*", action="ask")
+
+
+def evaluate_many(
+    permission: str,
+    patterns: Iterable[str],
+    *rulesets: Ruleset | Iterable[Rule],
+) -> list[Rule]:
+    """Evaluate ``permission`` against each of ``patterns`` (multi-pattern AND).
+
+    Returns the list of resolved rules in the same order as ``patterns``.
+    The caller is responsible for combining the results — opencode-style
+    multi-pattern AND collapses ``deny`` first, then ``ask``, then
+    ``allow``.
+    """
+    return [evaluate(permission, p, *rulesets) for p in patterns]
+
+
+def aggregate_action(rules: Iterable[Rule]) -> RuleAction:
+    """Collapse a list of per-pattern rules into one action.
+
+    Order:
+    1. If any rule is ``deny`` -> ``deny``.
+    2. Else if any rule is ``ask`` -> ``ask``.
+    3. Else if at least one rule is ``allow`` -> ``allow``.
+    4. Else (empty input) -> ``ask`` (safe default mirroring ``evaluate``).
+
+    Mirrors opencode's behavior in ``permission/index.ts:180-272``.
+    """
+    saw_ask = False
+    saw_allow = False
+    for rule in rules:
+        if rule.action == "deny":
+            return "deny"
+        if rule.action == "ask":
+            saw_ask = True
+        elif rule.action == "allow":
+            saw_allow = True
+    if saw_ask:
+        return "ask"
+    if saw_allow:
+        return "allow"
+    return "ask"
+
+
+__all__ = [
+    "Rule",
+    "RuleAction",
+    "Ruleset",
+    "aggregate_action",
+    "evaluate",
+    "evaluate_many",
+    "wildcard_match",
+]

surfsense_backend/app/services/user_tool_allowlist.py

@@ -19,7 +19,7 @@ from sqlalchemy.orm.attributes import flag_modified
 from app.agents.multi_agent_chat.constants import (
     CONNECTOR_TYPE_TO_CONNECTOR_AGENT_MAPS,
 )
-from app.agents.new_chat.permissions import Rule, Ruleset
+from app.agents.shared.permissions import Rule, Ruleset
 from app.db import SearchSourceConnector, async_session_maker
 
 logger = logging.getLogger(__name__)

surfsense_backend/tests/unit/agents/multi_agent_chat/middleware/checkpointed_subagent_middleware/test_parallel_self_and_middleware_gated.py

@@ -49,7 +49,7 @@ from app.agents.multi_agent_chat.middleware.shared.permissions.ask.request impor
 from app.agents.multi_agent_chat.subagents.shared.hitl.approvals.self_gated import (
     request_approval,
 )
-from app.agents.new_chat.permissions import Rule
+from app.agents.shared.permissions import Rule
 
 
 class _SubState(TypedDict, total=False):

surfsense_backend/tests/unit/agents/multi_agent_chat/middleware/shared/permissions/test_lc_hitl_wire.py

@@ -19,7 +19,7 @@ from typing_extensions import TypedDict
 from app.agents.multi_agent_chat.middleware.shared.permissions.ask.request import (
     request_permission_decision,
 )
-from app.agents.new_chat.permissions import Rule
+from app.agents.shared.permissions import Rule
 
 
 class _State(TypedDict, total=False):

surfsense_backend/tests/unit/agents/multi_agent_chat/middleware/shared/permissions/test_permission_ask_mcp_context.py

@@ -20,7 +20,7 @@ from app.agents.multi_agent_chat.middleware.shared.permissions.ask.payload impor
     build_permission_ask_payload,
 )
 from app.agents.shared.feature_flags import AgentFeatureFlags
-from app.agents.new_chat.permissions import Rule, Ruleset
+from app.agents.shared.permissions import Rule, Ruleset
 
 
 class _NoArgs(BaseModel):

surfsense_backend/tests/unit/agents/multi_agent_chat/middleware/shared/permissions/test_subagent_owned_ruleset.py

@@ -27,7 +27,7 @@ from app.agents.multi_agent_chat.middleware.shared.permissions import (
     build_permission_mw,
 )
 from app.agents.shared.feature_flags import AgentFeatureFlags
-from app.agents.new_chat.permissions import Rule, Ruleset
+from app.agents.shared.permissions import Rule, Ruleset
 
 
 def _kb_style_ruleset() -> Ruleset:

surfsense_backend/tests/unit/agents/multi_agent_chat/middleware/shared/permissions/test_trusted_tool_save_on_always.py

@@ -18,7 +18,7 @@ from app.agents.multi_agent_chat.middleware.shared.permissions import (
     build_permission_mw,
 )
 from app.agents.shared.feature_flags import AgentFeatureFlags
-from app.agents.new_chat.permissions import Rule, Ruleset
+from app.agents.shared.permissions import Rule, Ruleset
 
 
 class _NoArgs(BaseModel):

surfsense_backend/tests/unit/agents/multi_agent_chat/subagents/shared/test_subagent_builder.py

@@ -26,7 +26,7 @@ from app.agents.multi_agent_chat.subagents.shared.subagent_builder import (
     pack_subagent,
 )
 from app.agents.shared.feature_flags import AgentFeatureFlags
-from app.agents.new_chat.permissions import Rule, Ruleset, evaluate
+from app.agents.shared.permissions import Rule, Ruleset, evaluate
 
 
 class RateLimitError(Exception):

surfsense_backend/tests/unit/agents/new_chat/test_default_permissions_layering.py

@@ -27,7 +27,7 @@ from __future__ import annotations
 
 import pytest
 
-from app.agents.new_chat.permissions import (
+from app.agents.shared.permissions import (
     Rule,
     Ruleset,
     aggregate_action,

surfsense_backend/tests/unit/agents/new_chat/test_desktop_safety_rules.py

@@ -11,7 +11,7 @@ from __future__ import annotations
 import pytest
 
 from app.agents.new_chat.middleware.permission import PermissionMiddleware
-from app.agents.new_chat.permissions import (
+from app.agents.shared.permissions import (
     Rule,
     Ruleset,
     aggregate_action,

surfsense_backend/tests/unit/agents/new_chat/test_permission_middleware.py

@@ -10,7 +10,7 @@ from app.agents.new_chat.middleware.permission import (
     PermissionMiddleware,
     _normalize_permission_decision,
 )
-from app.agents.new_chat.permissions import Rule, Ruleset
+from app.agents.shared.permissions import Rule, Ruleset
 
 pytestmark = pytest.mark.unit
 

surfsense_backend/tests/unit/agents/new_chat/test_permissions.py

@@ -4,7 +4,7 @@ from __future__ import annotations
 
 import pytest
 
-from app.agents.new_chat.permissions import (
+from app.agents.shared.permissions import (
     Rule,
     Ruleset,
     aggregate_action,

surfsense_backend/tests/unit/agents/new_chat/test_specialized_subagents.py

@@ -332,6 +332,6 @@ class TestDenyPatternsCoverage:
 
 def _wildcard_matches(pattern: str, value: str) -> bool:
     """Helper using the same matcher the rule evaluator does."""
-    from app.agents.new_chat.permissions import wildcard_match
+    from app.agents.shared.permissions import wildcard_match
 
     return wildcard_match(value, pattern)