refactor(agents): move tools package to app/agents/shared (slice 6)

Relocate the entire new_chat/tools/ package (62 files incl. registry, hitl, MCP
cluster, and all connector subpackages: gmail/slack/discord/teams/drive/etc.)
to the shared kernel. The package turned out to be a clean cohesive cluster:
its only references to non-tools new_chat modules were comments, and its
middleware deps were already flipped to shared in slice 5c.

Flip 33 live importers (multi-agent, flows, routes, services, anonymous_agent,
tests). Re-export shims remain for the frozen single-agent stack: a package
__init__ mirroring the public surface (new_chat.__init__ imports it) plus
invalid_tool + registry submodule shims (chat_deepagent imports those).

Resolves slice 5c's two transient back-edges: shared/middleware/action_log
(TYPE_CHECKING ToolDefinition) and tool_call_repair (local INVALID_TOOL_NAME)
now point at app.agents.shared.tools.

surfsense_backend/app/agents/shared/tools/connected_accounts.py

@@ -0,0 +1,135 @@
+"""Connected-accounts discovery tool.
+
+Lets the LLM discover which accounts are connected for a given service
+(e.g. "jira", "linear", "slack") and retrieve the metadata it needs to
+call action tools — such as Jira's ``cloudId``.
+
+The tool returns **only** non-sensitive fields explicitly listed in the
+service's ``account_metadata_keys`` (see ``registry.py``), plus the
+always-present ``display_name`` and ``connector_id``.
+"""
+
+import logging
+from typing import Any
+
+from langchain_core.tools import StructuredTool
+from pydantic import BaseModel, Field
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.future import select
+
+from app.db import SearchSourceConnector, SearchSourceConnectorType, async_session_maker
+from app.services.mcp_oauth.registry import MCP_SERVICES
+
+logger = logging.getLogger(__name__)
+
+_SERVICE_KEY_BY_CONNECTOR_TYPE: dict[str, str] = {
+    cfg.connector_type: key for key, cfg in MCP_SERVICES.items()
+}
+
+
+class GetConnectedAccountsInput(BaseModel):
+    service: str = Field(
+        description=(
+            "Service key to look up connected accounts for. "
+            "Valid values: " + ", ".join(sorted(MCP_SERVICES.keys()))
+        ),
+    )
+
+
+def _extract_display_name(connector: SearchSourceConnector) -> str:
+    """Best-effort human-readable label for a connector."""
+    cfg = connector.config or {}
+    if cfg.get("display_name"):
+        return cfg["display_name"]
+    if cfg.get("base_url"):
+        return f"{connector.name} ({cfg['base_url']})"
+    if cfg.get("organization_name"):
+        return f"{connector.name} ({cfg['organization_name']})"
+    return connector.name
+
+
+def create_get_connected_accounts_tool(
+    db_session: AsyncSession,
+    search_space_id: int,
+    user_id: str,
+) -> StructuredTool:
+    """Factory function to create the get_connected_accounts tool.
+
+    The tool acquires its own short-lived ``AsyncSession`` per call via
+    :data:`async_session_maker` so the closure is safe to share across
+    HTTP requests by the compiled-agent cache. Capturing a per-request
+    session here would surface stale/closed sessions on cache hits.
+
+    Args:
+        db_session: Reserved for registry compatibility. Per-call sessions
+            are opened via :data:`async_session_maker` inside the tool body.
+        search_space_id: Search space ID to scope account discovery to.
+        user_id: User ID to scope account discovery to.
+
+    Returns:
+        Configured StructuredTool for connected-accounts discovery.
+    """
+    del db_session  # per-call session — see docstring
+
+    async def _run(service: str) -> list[dict[str, Any]]:
+        svc_cfg = MCP_SERVICES.get(service)
+        if not svc_cfg:
+            return [
+                {
+                    "error": f"Unknown service '{service}'. Valid: {', '.join(sorted(MCP_SERVICES.keys()))}"
+                }
+            ]
+
+        try:
+            connector_type = SearchSourceConnectorType(svc_cfg.connector_type)
+        except ValueError:
+            return [{"error": f"Connector type '{svc_cfg.connector_type}' not found."}]
+
+        async with async_session_maker() as db_session:
+            result = await db_session.execute(
+                select(SearchSourceConnector).filter(
+                    SearchSourceConnector.search_space_id == search_space_id,
+                    SearchSourceConnector.user_id == user_id,
+                    SearchSourceConnector.connector_type == connector_type,
+                )
+            )
+            connectors = result.scalars().all()
+
+            if not connectors:
+                return [
+                    {
+                        "error": f"No {svc_cfg.name} accounts connected. Ask the user to connect one in settings."
+                    }
+                ]
+
+            is_multi = len(connectors) > 1
+
+            accounts: list[dict[str, Any]] = []
+            for conn in connectors:
+                cfg = conn.config or {}
+                entry: dict[str, Any] = {
+                    "connector_id": conn.id,
+                    "display_name": _extract_display_name(conn),
+                    "service": service,
+                }
+                if is_multi:
+                    entry["tool_prefix"] = f"{service}_{conn.id}"
+                for key in svc_cfg.account_metadata_keys:
+                    if key in cfg:
+                        entry[key] = cfg[key]
+                accounts.append(entry)
+
+            return accounts
+
+    return StructuredTool(
+        name="get_connected_accounts",
+        description=(
+            "Discover which accounts are connected for a service (e.g. jira, linear, slack, clickup, airtable). "
+            "Returns display names and service-specific metadata the action tools need "
+            "(e.g. Jira's cloudId). Call this BEFORE using a service's action tools when "
+            "you need an account identifier or are unsure which account to use."
+        ),
+        coroutine=_run,
+        args_schema=GetConnectedAccountsInput,
+        metadata={"hitl": False},
+    )