Add missing tools to chat agent: csv_sla_breach_tickets, csv_ticket_stats

The SLA Breach page was slow because the chat agent (agents.py)
didn't have the csv_sla_breach_tickets tool. The prompt said
'call csv_sla_breach_tickets' but the tool didn't exist, so the
LLM tried to replicate SLA breach logic manually using
csv_list_tickets — fetching many tickets and reasoning over them.

Now the chat agent has all 6 CSV tools matching the operations:
- csv_list_tickets (existing)
- csv_get_ticket (existing)
- csv_search_tickets (existing)
- csv_ticket_fields (existing)
- csv_sla_breach_tickets (NEW — pre-computed, ~1000 tokens)
- csv_ticket_stats (NEW — aggregated stats, ~350 bytes)

Expected improvement: 1 tool call (~1000 tokens) instead of
multiple list calls + manual reasoning (~30-60K tokens).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: abossard

backend/agents.py

@@ -322,6 +322,18 @@ def _csv_ticket_fields() -> str:
             from tickets import Ticket
             return json.dumps(list(Ticket.model_fields.keys()))
 
+        def _csv_sla_breach_tickets(unassigned_only: bool = True, include_ok: bool = False) -> str:
+            """Return tickets at SLA breach risk with pre-computed age and breach status."""
+            from tickets import get_sla_breach_report
+            tickets = service.list_tickets(has_assignee=False if unassigned_only else None)
+            report = get_sla_breach_report(tickets)
+            return json.dumps(report.model_dump(mode="json"), default=str)
+
+        def _csv_ticket_stats() -> str:
+            """Get aggregated ticket statistics."""
+            stats = service.get_ticket_stats()
+            return json.dumps(stats, default=str)
+
         return [
             StructuredTool.from_function(
                 func=_csv_list_tickets,
@@ -331,40 +343,44 @@ def _csv_ticket_fields() -> str:
                     "(new, assigned, in_progress, pending, resolved, closed, cancelled), "
                     "assigned_group, has_assignee (true/false), limit (default 50, max 100), "
                     "and fields (comma-separated field names). "
-                    "Default response is compact for speed: "
-                    "'id,summary,status,priority,assignee,assigned_group,created_at,updated_at'. "
-                    "For deterministic analytics, prefer status/priority/date fields and avoid wide payloads. "
-                    "Notes/resolution are excluded by default unless requested via fields. "
-                    "Use fields='*' only when full payload is absolutely needed. Returns JSON array."
+                    "Default response is compact for speed. Returns JSON array."
                 ),
             ),
             StructuredTool.from_function(
                 func=_csv_get_ticket,
                 name="csv_get_ticket",
                 description=(
-                    "Get ticket by UUID (id). Supports optional fields (comma-separated). "
-                    "Default response is compact fields without notes/resolution for speed. "
-                    "Prefer requesting only required fields for drill-down. "
-                    "Request notes/resolution explicitly via fields, or use fields='*' for full payload."
+                    "Get full ticket details by UUID (id). Supports optional fields. "
+                    "Use for drill-down after list/search."
                 ),
             ),
             StructuredTool.from_function(
                 func=_csv_search_tickets,
                 name="csv_search_tickets",
                 description=(
-                    "Search tickets by text across summary, description, notes, resolution, requester, group, city. "
-                    "Supports fields (comma-separated field names). "
-                    "Notes/resolution are excluded by default unless requested via fields. "
-                    "Prefer low limits and compact fields for latency-sensitive runs. "
-                    "Default response is compact fields for speed; use fields='*' only when needed. "
-                    "Returns JSON array."
+                    "Search tickets by text across summary, description, notes, requester, group, city. "
+                    "Returns compact fields. Use csv_get_ticket for full details."
                 ),
             ),
             StructuredTool.from_function(
                 func=_csv_ticket_fields,
                 name="csv_ticket_fields",
                 description="List available ticket fields (schema) as JSON array of field names.",
             ),
+            StructuredTool.from_function(
+                func=_csv_sla_breach_tickets,
+                name="csv_sla_breach_tickets",
+                description=(
+                    "Return tickets at SLA breach risk. Pre-computed age_hours, sla_threshold_hours, "
+                    "breach_status. SLA thresholds: critical=4h, high=24h, medium=72h, low=120h. "
+                    "Default: unassigned_only=true, include_ok=false. Returns compact JSON."
+                ),
+            ),
+            StructuredTool.from_function(
+                func=_csv_ticket_stats,
+                name="csv_ticket_stats",
+                description="Get aggregated statistics: total, by_status, by_priority, by_group, by_city.",
+            ),
         ]
 
     async def run_agent(self, request: AgentRequest) -> AgentResponse: