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99Pay MCP

by io.github.mcp-dir

openfinance_list_investments

Read-onlyIdempotent

Returns the investment portfolio for a connection (broker or bank with INVESTMENTS product enabled): FIIs, stocks, ETFs, fixed income (CDB/LCI/LCA/Tesouro), mutual funds, retirement (previdência) and COE. Each row carries balance, amount, amountOriginal, amountProfit, lastMonthRate / annualRate / lastTwelveMonthsRate (when available), dueDate, issuer, ISIN, etc. Returns { total:0, results:[], warning } instead of throwing when INVESTMENTS isn't enabled (403) or other upstream errors. DATA INTEGRITY: when MULTIPLE positions come back as TOTAL_WITHDRAWAL with balance/quantity 0 at once (mass zeroing), the tool cross-checks each position's own transaction history upstream; if the zeroing is contradicted (BUY with no sale/redemption/transfer) the response carries data_integrity_warning and the affected rows are flagged integrity:'suspect_zeroed' — treat those balances as UNAVAILABLE (likely a temporary connector failure publishing zeros), never as real R$0, and do NOT sum them into the portfolio.

Bulk support: accepts item_ids for batched execution.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
itemNo
pageNo
typeNo
item_idNo
item_idsNo
page_sizeNo

TDQS

A4.3/5.0
Behavior5/5

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

Beyond annotations (readOnlyHint, idempotentHint, destructiveHint), the description details error handling (returns {total:0, results:[], warning} on 403), data integrity checks (cross-checks with transaction history), and flagging suspect zero balances. No contradictions with annotations.

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

Conciseness4/5

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

The description is detailed and well-structured, starting with the core purpose, then field details, error handling, and data integrity. It is slightly long but every sentence adds value.

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

Completeness4/5

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

Given the complexity (6 parameters, no output schema), the description covers main behavior, error handling, data integrity, and bulk support. It lacks explanation of paging parameters (page, page_size) but remains largely complete.

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

Parameters3/5

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

Schema coverage is 0%, and the description only explains 'item_ids' for bulk support. Other parameters (item, page, type, item_id, page_size) are not elaborated, but the overall context of listing investments helps infer their purpose.

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 explicitly states it returns the investment portfolio for a connection, listing specific asset types (FIIs, stocks, ETFs, etc.) and detailed fields. It clearly distinguishes from sibling tools like openfinance_list_investment_transactions.

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

Usage Guidelines4/5

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

The description specifies when to use the tool (for connections with INVESTMENTS product enabled) and what happens when it's not enabled (returns a warning instead of error). It provides guidance on handling data integrity warnings, but does not explicitly name alternative tools for transactions.

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

A4.4/5.0
Disambiguation5/5

Each tool targets a distinct resource and action, with clear separation between general server utilities (authenticate, connect, marketplace) and the openfinance_* family (get/list/search/update per domain). No two tools appear to overlap: list_transactions vs list_transactions_by_item are differentiated by granularity, and get_item_status vs provider_status by scope. The marketplace tool, while broad, is explicitly named and described, so it doesn't cause ambiguity.

Naming Consistency5/5

All 20 openfinance_* tools follow a strict verb_noun snake_case pattern (list_accounts, get_account_balance, force_sync, update_transaction_category, etc.). The five general tools also use snake_case and clear names, maintaining consistency across the set. No mixing of conventions or inconsistent verb styles.

Tool Count4/5

At 25 tools, the set is on the higher end but well-justified for a platform that aggregates Open Finance data and provides a marketplace. The 20 openfinance tools cover distinct banking operations (accounts, transactions, bills, loans, investments, connections, sync, status, search, categories), each addressing a specific need. The 5 general tools handle authentication, connection status, and platform info. No obvious trivial or redundant tools; each earns its place.

Completeness5/5

The tool surface is comprehensive for the stated domain: CRUD-like coverage across financial resources (list/get for accounts, transactions, bills, loans, investments), plus state management (force_sync, disconnect, update_category) and ecosystem support (search_connectors, provider_status, marketplace). It also includes utilities like authenticate, connect, and version/bug reporting. No missing operations that would cause agent failures; the set covers connection lifecycle, data retrieval, and even API diagnostics.

Resources