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openfinance_list_accounts

Read-onlyIdempotent

Returns accounts for a bank connection: BANK (checking/savings) and CREDIT (credit card) with balance, number, type, subtype, bankData, and creditData. Also returns bank (the brand/connector name like 'Nubank Empresas' — same shown in the dashboard UI) and connector_id. Note: each account's name is the legal entity that issues the account (e.g. 'Nu Pagamentos S.A. - Instituição de Pagamento'), which is not the same as the brand — when referring to the bank in user-facing text, use bank. OMIT item to list accounts across ALL linked banks at once — the response aggregates every connection's accounts into results, each row tagged with its own bank/connector_id/item_id (use this when the user asks for 'my accounts/cards' without naming a bank). Pass item to target a single bank (response carries bank/connector_id/item_id at the root). CREDIT (credit card) balance: its meaning is CONNECTOR-DEPENDENT — some banks report the current open-bill partial, others the full revolving/installment debt — so do NOT treat balance as 'this month's bill'. The open billing cycle is defined by creditData.balanceCloseDate (when it closes) / balanceDueDate (when it's due). For a standardized open-bill amount and total debt that mean the same across connectors, use openfinance_list_credit_card_bills (open_bill + total_pending_debt, derived from PENDING transactions); closed bills come from that same tool's results. A CREDIT row may carry creditData.usedAmount (how much of THIS card's limit the bank reports as consumed) and a balance_notice. balance_notice means balance came back 0,00 while the bank's own payload indicates an outstanding amount — some issuers never fill the card's consolidated balance field. When it is present, do NOT tell the user the card has nothing to pay: read the amount from openfinance_list_credit_card_bills instead. bankData.closingBalance and automaticallyInvestedBalance are provider-reported extras that can LAG right after a connection is first created: the bank may publish the connection as UPDATED before those derived fields converge, so they can briefly carry a stale/phantom value that a force sync (openfinance_force_sync) reconciles. The account's own balance is authoritative — treat those two as hints until they agree with it. May include a provider_incident block when the Open Finance provider has an OPEN incident affecting a bank in this response: balances and credit limits may be unreliable (incomplete or wrong, e.g. a credit limit near 1,00) even with the connection UPDATED, until the provider recovers. Do not present those values as real. May include an identity_notice when the SAME account (same number) arrives via two connections stamped with DIFFERENT owner/taxNumber: in Open Finance those fields reflect each connection's CONSENT HOLDER (e.g. a joint account consented by both holders), so dedupe by account number before summing balances and do not attribute ownership by owner/taxNumber for those accounts.

Bulk support: accepts item_ids for batched execution.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
itemNo
typeNo
item_idNo
item_idsNo

TDQS

A4.9/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Beyond the readOnly/idempotent annotations, the description discloses several non-obvious behavioral pitfalls: CREDIT `balance` semantics are connector-dependent, `balance_notice` means a zero balance is not trustworthy, `bankData` can lag after connection, `provider_incident` invalidates balance reliability, and `identity_notice` requires dedupe before summing. This is exceptional transparency that materially prevents incorrect agent behavior.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is long, but every paragraph earns its place by addressing a real semantic trap or usage decision. It is front-loaded with the core behavior and then layered into field-specific caveats, making it navigable despite its length.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With no output schema, the description provides a thorough picture of the response shape and special conditions. It explains `results` aggregation, root-level fields when `item` is passed, per-row tagging, and all the notice blocks an agent may encounter. It is complete enough for an agent to invoke the tool and interpret results correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0%, so the description carries the full burden. It clearly explains `item` (omit for all, pass for single), `item_ids` (bulk), and indirectly explains `type` via the BANK/CREDIT output distinction. However, the singular `item_id` parameter is not explicitly described; while inferable, it is a small gap in an otherwise strong parameter explanation.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description opens with a specific, actionable statement: 'Returns accounts for a bank connection: BANK (checking/savings) and CREDIT (credit card) with balance, number, type, subtype, bankData, and creditData.' This clearly names the resource and the output scope, and the explanation of `bank` vs `name` further refines what the tool returns. It also distinguishes this tool from `openfinance_list_credit_card_bills` by explicitly pointing to that tool for bill-level data.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description gives explicit when-to-use guidance: omit `item` to list all accounts, pass `item` to target a single bank, and use `openfinance_list_credit_card_bills` for standardized open-bill amounts and total debt. It even covers the 'my accounts/cards' user-intent case, making the routing decision unambiguous.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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TDQS

A3.9/5.0
Disambiguation3/5

The openfinance_* tools are mostly distinct by resource and action, but several pairs create ambiguity: openfinance_get_item_status vs openfinance_provider_status, openfinance_list_transactions vs openfinance_list_transactions_by_item, and the monolithic marketplace tool overlaps with top-level report_bug and toolkit_info. Descriptions do clarify the differences, but an agent selecting by name alone could easily choose the wrong tool.

Naming Consistency3/5

The openfinance_* family follows a mostly consistent verb_noun pattern (list_accounts, get_balance, update_transaction_category), which is good. However, top-level tools mix bare verbs, nouns, and verb_noun forms (authenticate, connect, marketplace, show_version, toolkit_info), and openfinance_provider_status breaks the verb-first pattern. The naming is readable but not uniform across the whole set.

Tool Count3/5

25 tools sits right at the heavy boundary, though the server covers two domains: mcp.ai platform management and Open Finance data access. Some tools could be consolidated (list_transactions vs list_transactions_by_item, get_item_status vs provider_status), and marketplace is a monolithic super-tool that bundles many sub-capabilities. Overall the count is defensible but slightly bloated.

Completeness4/5

The Open Finance surface is thorough: accounts, balances, transactions, credit card bills, loans, investments, connection management, sync, category updates, and provider health are all covered. Minor gaps exist, such as no investment detail beyond the list and connection actions being URL-based rather than first-class tools, but there are no dead ends for typical read/aggregation workflows.