fix(agent): raise tool rounds and ease calendar creates

Local models were burning the 8-round budget on simple event adds.
Raise the limit, resolve calendars by name/default, and inject the
household clock so relative dates work.

src/modules/agent/tools.ts

@@ -159,11 +159,16 @@ export const AGENT_TOOLS: AgentToolDefinition[] = [
     type: "function",
     function: {
       name: "create_event",
-      description: "Create a calendar event.",
+      description:
+        "Create a calendar event. Provide calendarId, or calendarName to match by name, or omit both to use the first visible calendar.",
       parameters: {
         type: "object",
         properties: {
-          calendarId: { type: "string" },
+          calendarId: { type: "string", description: "UUID of the calendar" },
+          calendarName: {
+            type: "string",
+            description: "Calendar display name when calendarId is unknown",
+          },
           title: { type: "string" },
           startAt: { type: "string", description: "ISO 8601 start" },
           endAt: { type: "string", description: "ISO 8601 end" },
@@ -175,7 +180,7 @@ export const AGENT_TOOLS: AgentToolDefinition[] = [
             description: "Optional reminder N minutes before start",
           },
         },
-        required: ["calendarId", "title", "startAt", "endAt"],
+        required: ["title", "startAt", "endAt"],
       },
     },
   },
@@ -762,13 +767,14 @@ export const AGENT_SYSTEM_PROMPT = `You are the famapp household assistant. Help
 
 Use the provided tools to read and update data. Prefer calling tools instead of guessing. Be concise and friendly.
 
-When no dedicated tool fits, or you are unsure how to do something:
+Prefer a dedicated tool when one exists (create_event, add_list_item, create_note, etc.). When no dedicated tool fits, or you need an endpoint that is not wrapped yet:
 1. Call get_api_docs with a relevant search term to find the right /api/v1/* endpoint.
 2. Call call_api with the documented method, path, query, and body.
+If a tool call fails, read the error body and fix the arguments before trying a different approach.
 
 When the user sends a photo, read dates, times, locations, and action items from it, then use tools to act.
 
-Lists: resolve list ids via list_lists. To complete items, list_list_items then update_list_item with done: true.
+Lists: resolve list ids via list_lists, or pass listType to add_list_item. To complete items, list_list_items then update_list_item with done: true.
 
 Journal: per-user private entries. Valid mood ids: ${JOURNAL_MOOD_IDS}. stress is 1-10. pillsTaken is boolean.
 
@@ -776,4 +782,32 @@ Garden: care types are free text (water, fertilize, prune, etc.). Use list_garde
 
 Sharing: journal entries are not shareable. Shareable types: calendar, calendar.event, list, note, garden.plant, garden.container.
 
-Calendar: use ISO 8601 datetimes. Bang dates use YYYY-MM-DD.`;
+Calendar: use ISO 8601 datetimes with the household timezone below. Pass calendarId, or calendarName, or omit both to use the first visible calendar. Bang dates use YYYY-MM-DD.`;
+
+export function resolveHouseholdTimezone(): string {
+  return process.env.HOUSEHOLD_TIMEZONE?.trim() || process.env.TZ?.trim() || "America/Chicago";
+}
+
+export function appendAgentRuntimeContext(prompt: string, now: Date = new Date()): string {
+  const timeZone = resolveHouseholdTimezone();
+  let localNow: string;
+  try {
+    localNow = new Intl.DateTimeFormat("en-US", {
+      timeZone,
+      weekday: "long",
+      year: "numeric",
+      month: "long",
+      day: "numeric",
+      hour: "numeric",
+      minute: "2-digit",
+      hour12: true,
+      timeZoneName: "short",
+    }).format(now);
+  } catch {
+    localNow = now.toISOString();
+  }
+
+  return `${prompt.trim()}
+
+Current time: ${localNow} (${timeZone}). ISO now: ${now.toISOString()}. Resolve relative dates from this clock.`;
+}