Get the authenticated YNAB user (their user ID). Read-only; takes no input. Mainly useful to verify the API token works — for credential/config diagnostics prefer ynab_auth_status, which needs no API request.

List all budgets. Use a budget ID from the results in other tools, or omit budgetId to use the last-used budget.

Get a budget summary including name, currency format, and account/category/payee counts. Pass lastKnowledgeOfServer to get a delta export instead: every entity (accounts, payees, categories, months, transactions, scheduled transactions, ...) that changed since that server knowledge, plus the new server_knowledge for the next delta request. A delta request with lastKnowledgeOfServer: 0 returns the full budget export, which can be very large — responses over the YNAB_MAX_RESPONSE_BYTES cap (default 8 MB) are rejected; on big budgets prefer incremental deltas or the dedicated list tools.

Get a budget's settings: currency format (symbol, decimal digits, placement) and date format. Read-only. Use when formatting amounts or dates for display; not needed for tool inputs, which always use dollars and YYYY-MM-DD.

List all accounts in a budget with balances (dollars), type, closed/on-budget status, last-reconciled time, and debt metadata. Read-only. Use to find account IDs for transaction tools, check balances, or spot direct-import errors (direct_import_in_error). Includes closed accounts; filter on 'closed' if you only want active ones.

Get one account's details: balances (dollars), type, reconciliation timestamp, and debt metadata. Read-only. Prefer list_accounts when comparing several accounts; use this when you already have the account ID and want fresh detail.

List all category groups and their categories with budgeted/activity/balance amounts (dollars) for the current month. Read-only. Use to find category IDs and survey the budget structure; for a specific month's numbers use get_month, and for name-based lookup use search_categories. Hidden and deleted items are included with flags — filter on 'hidden'/'deleted' when presenting.

Get one category's full detail for the current month, including goal/target fields (type, target amount, funding progress). Read-only. Use for goal inspection; for a past or future month's numbers use get_month_category instead.

Get category budget for a specific month

List all payees with IDs and transfer_account_id (non-null marks a transfer payee — use it as payeeId when creating transfers instead of inventing a 'Transfer : ...' name). Read-only. For name-based lookup prefer search_payees; payee lists on mature budgets can be long.

Get one payee by ID (name, transfer_account_id, deleted flag). Read-only. Mostly useful to confirm a payee still exists or resolve its transfer account; for discovery use search_payees.

List all payee locations (GPS coordinates YNAB's mobile app recorded at transaction time). Read-only. Only payees with mobile-recorded transactions appear; many budgets have none. Use get_payee_locations_by_payee to scope to one payee.

Get one payee location record by its ID (payee, latitude, longitude). Read-only; requires a payee-location ID from list_payee_locations.

Get all recorded GPS locations for one payee. Read-only. Useful to confirm which physical merchant an ambiguous payee refers to; empty for payees never used in YNAB's mobile app.

List all budget months with summary numbers per month (income, budgeted, activity, Ready to Assign, age of money — dollars). Read-only. Use to find which months exist and their headline totals; for per-category detail in one month use get_month.

Get one budget month's detail: month totals plus every category's budgeted/activity/balance and goal fields for that month (dollars). Read-only. The workhorse for monthly reviews and budget-vs-actual questions; combine with get_overspent_categories for the negative balances only.

List all money movements — the history of budget re-allocations between categories (who moved how much from where to where, when). Read-only. Use to answer 'why did this category's assigned amount change'; these are budget moves, not transactions. Can be long on old budgets; prefer get_money_movements_by_month for a specific month.

Get money movements (category-to-category budget re-allocations) for one month. Read-only. The month-scoped view of list_money_movements; use during month-end review to see how assignments were shuffled.

List all money movement groups — batches of related money movements applied together (e.g. one multi-category re-allocation). Read-only. Join to list_money_movements rows via money_movement_group_id.

Get money movement groups (batched budget re-allocations) for one month. Read-only. The month-scoped view of list_money_movement_groups.

Get transactions with optional filters. Use type='unapproved' or type='uncategorized' to filter. Optionally filter by account, category, payee, or month. You may combine one of accountId/categoryId/payeeId with month to fetch that resource's transactions for a specific month. Each returned transaction includes 'import_payee_name_original' — the raw merchant string from the bank import (e.g. 'AplPay LS ONION RIVEMONTPELIER VT') — which encodes processor flag, merchant name (often longer than the cleaned payee_name), and city+state. This is the primary disambiguation field when payee_name is truncated or ambiguous. YNAB now defaults omitted sinceDate to one year ago; pass an explicit older sinceDate to retrieve older history. Note: large date ranges (6+ months on a busy budget) can return 50KB+ of data; narrow with categoryId/payeeId/month/sinceDate/untilDate filters when possible.

Get a single transaction by ID. Automatically handles composite scheduled-transaction IDs (e.g. uuid_YYYY-MM-DD): the date suffix is stripped before the lookup. If a composite ID's underlying matched transaction has been deleted, falls back to returning the active scheduled-transaction template wrapped in a marker shape { resource_type: 'scheduled_transaction', reason: 'composite_id_with_no_matched_transaction', scheduled_transaction, requested_id } so callers can distinguish the two return shapes. Non-composite IDs preserve strict behavior: a 404 still surfaces as resource_not_found.

List all scheduled (recurring) transactions. NOTE: only manually-created recurring entries appear here — auto-imported recurring charges (subscriptions, utilities, insurance) are NOT included. Use prior-month transaction history to identify recurring charge timing instead.

Get one scheduled (recurring) transaction by ID: next date, frequency, amount (dollars), payee, category. Read-only. Composite realized-transaction IDs (uuid_YYYY-MM-DD) are not valid here — strip the date suffix or use get_transaction, which handles them.

Search categories by partial name match (case-insensitive). Useful for finding category IDs when you only know part of the name.

Search payees by partial name match (case-insensitive). Useful for finding payee IDs.

Get all unapproved transactions grouped by status: those already categorized (ready to approve) and those still uncategorized (need category first). Each transaction includes a 'flags' array: manually_entered (not bank-imported), match_broken (matched reference is stale — the matched_transaction_id field is read-only via this API; YNAB web/iOS UI is required to clear that link. The transaction itself remains fully mutable: you CAN approve, recategorize, and edit memo via update_transaction. The broken match persists as a cosmetic flag until the user resolves it in the UI.), scheduled_transaction_realized, new_payee (no transaction history for this payee), no_prior_amount_match (novel amount for this payee), category_drift:was_X (payee categorized differently before). Never approve uncategorized transactions without explicit user instruction. For large budgets the full response can exceed 100KB; pass summary:true for counts + by-payee aggregates only, or compact:true to keep per-transaction rows (with IDs) while dropping bulky fields so the response fits inline.

Get all categories with a negative balance for a given month. Use this to find prior-month overspends that are silently reducing the current month's Ready to Assign.

Check whether the YNAB MCP server has credentials configured and whether write tools are enabled.

Discover the YNAB MCP server tools. Use this when you need YNAB budgets, accounts, categories, payees, transactions, scheduled transactions, unapproved transaction review, approval, or budget cleanup tools.

Execute an existing read-only YNAB MCP tool by name. Use ynab_tool_index first to discover YNAB tool names, then pass the selected tool_name and its JSON input. Write-capable tools must be called directly or through ynab_write_tool_execute when YNAB_ALLOW_WRITES=1.

List the local undo journal: every write this MCP server performed (most recent first), with per-entry undo capability. Read-only; reads a local journal file, never the YNAB API. Use this to review what changed before calling undo_operation, or to audit a session's writes. Entries with undoable:false are recorded for audit only and cannot be reversed automatically.

Read-only audit of credit card payment categories: for each open credit card / line of credit account, compares the card's balance with its Credit Card Payment category's available balance. In a healthy budget the payment category equals the card balance (sign-flipped) for spending that is budgeted; a shortfall means a future payment is not fully funded (common after overspending or direct debt increases). Reports each card's balance, payment-category balance, difference, and a status. Makes no changes — fix shortfalls by assigning to the payment category via update_month_category. Interpretation note: small transient differences appear while recent transactions are pending/uncleared; treat sub-dollar or same-day differences as timing, not error.

Read-only reconciliation diagnosis. Without accountId: summarizes every open account's last-reconciled date and cleared/uncleared balances (one API request). With accountId: additionally lists that account's uncleared and unapproved transactions since the last reconciliation, which are exactly the rows to compare against the bank statement. Makes no changes — actual reconciliation (marking transactions reconciled and locking the balance) happens in the YNAB UI; use this to find what needs attention first. Interpretation note: an old last_reconciled_at is not itself a problem if cleared_balance matches the bank; uncleared transactions older than a few days are the usual culprits.

Read-only income vs. spending summary by month, computed from transaction history. Income counts non-transfer inflows to 'Inflow: Ready to Assign'; spending counts non-transfer outflows; transfers and deleted transactions are excluded, so credit card payments do not double-count. Includes per-month savings rate ((income - spending) / income). Use for savings-rate reports, month-end closes, and trend questions like 'am I saving enough'. Refunds appear as negative spending months' offsets, not income.

Read-only detection of recurring charges (subscriptions, utilities, insurance) from transaction history: groups outflows by payee + exact amount and reports groups whose spacing matches a weekly/biweekly/monthly/quarterly/yearly cadence, with estimated annual cost. Use for subscription audits and 'what am I paying for' questions. Catches auto-imported recurring charges that list_scheduled_transactions cannot see (that tool only lists manually-created recurrences). Limitations: variable-amount bills (utilities that fluctuate) are missed because grouping is by exact amount; the same vendor billed under multiple identities or payee spellings appears as separate rows — verify against payee variants with search_payees before concluding a subscription was cancelled.

Read-only budget health snapshot combining month data, account balances, and a trailing-3-month income/spending summary: savings rate, age of money, Ready to Assign, overspent categories, credit card payment funding, and a green/yellow/red indicator per metric. Threshold guidance (standard personal-finance defaults, not YNAB rules): savings rate 20%+ green; carried credit card debt red when payment categories are underfunded; overspent categories yellow. Use as the opening move of a monthly review or 'how am I doing' question, then drill into specific tools. Costs about 4 API requests.

Export transactions as CSV text (same filters as get_transactions). Columns: date, amount (dollars, negative = outflow), payee, category, account, memo, cleared, approved, transfer, id. Use when the user wants data for a spreadsheet or offline analysis; for programmatic work prefer get_transactions (structured JSON). Read-only. Large date ranges produce large output — narrow with filters when possible.