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Stone Pagamentos MCP
io.github.mcp-dir/stonepagamentos-mcp in the official MCP registry.
Endpoint https://api.mcp.ai/p_stonepagamentos. Source: github.com/mcp-dir/stonepagamentos-mcp.
The registry describes it as: Connect your Stone Pagamentos account to AI via Brazil's Open Finance: balances, statements, cards,
We read its 25 tools on 2026-10-22. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
openfinance_search_bank_connectors openfinance_list_connections openfinance_get_item_status openfinance_provider_status openfinance_list_accounts openfinance_list_transactions openfinance_list_transactions_by_item openfinance_list_credit_card_bills openfinance_list_investments openfinance_list_investment_transactions openfinance_list_loans openfinance_get_loan_detail openfinance_force_sync openfinance_get_account_balance openfinance_get_accounts_detail openfinance_get_credit_card_bill openfinance_list_categories openfinance_update_transaction_category openfinance_disconnect_bank show_version report_bug connect toolkit_info marketplace authenticate
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[](https://lazaretto.dev/mcp-registry/io-github-mcp-dir-stonepagamentos-mcp)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.