Castan, from seed to succeed

• Workspace and what it holds — Which Castan workspace this key opens, and what it holds: the workspace name and plan, the access this key has, every connected source with its status and last sync, and how much of each kind of content is indexed. Call this first whenever another tool comes back empty, or whenever you need to be sure which workspace you are reading.
• Search the company brain — Search everything this company knows (email, Slack, meetings, code, documents) and return the most relevant passages with their source. Use this for any question about the company: decisions, promises, people, history.
• Upcoming meetings — Meetings on the calendar from now forward: title, start, end and the calendar they came from. Default window: the next 7 days, up to 60. Past meetings are not in this answer; recent_meetings has those.
• Recent meetings — Meetings the brain captured recently, with recap text when available. Ask ask_brain for details about any of them.
• Customers and companies — Companies this workspace knows. An owner key also gets open receivable totals and overdue counts; a member key gets the companies without any money columns.
• Work in progress — What the company is building and tracking: Studio projects with task progress, and checklists with completion.
• Open receivables — Unpaid invoices, overdue first: number, customer, amount, due date. Owner only: this tool is registered for an owner key and is absent for a member key.
• Finance summary — Cash revenue, invoices issued, and payments for a period. Numbers come from stored rows; nothing is estimated. Owner only: this tool is registered for an owner key and is absent for a member key.

Schemas and invoke metadata: Directory API