Discover the hidden raw Splitwise tools on demand (lazy loading keeps this server's default token footprint tiny).

With no query: returns a compact group index. With a query (e.g. 'expenses', 'groups', 'notifications' or a tool name): returns matching tools WITH their full input schemas and registers them into this session so they can be called directly. enable=false only reports. After enabling, clients that support tools/list_changed refresh automatically.

Configure or replace the Splitwise API key. Validates the key against Splitwise before saving, so a wrong key is never stored. Ask the user to generate a personal API key at https://secure.splitwise.com/apps and pass it here.

Report whether a Splitwise API key is configured, where it came from (stored credential vs environment), and a masked preview. Use this to diagnose auth failures.

Remove the stored Splitwise API key (log out). Environment-provided keys cannot be removed here and remain active as fallback.

Resolve human-friendly identifiers (names, partial names, emails, user IDs, 'me') into Splitwise user IDs. Ambiguous names return candidate lists so you can ask the user which one they meant.

Agent-friendly expense creation from messy input. Participants can be names, partial names ('alice'), emails or user IDs; they are resolved automatically. Splits equally among participants plus the payer by default (set include_payer_in_split=false when the payer did not consume); pass owed_shares like {"Alice": "100.00"} for custom amounts that must sum to cost. category_name is fuzzy-matched against Splitwise categories; currency defaults to your default currency. Returns who owes what.

One-call financial overview: per-currency totals of what you are owed vs what you owe across all friends, plus each friend's balance and simplified group debts. Replaces manual aggregation over get_friends/get_groups.