Revokes the Open Finance consent for a specific bank and deletes the connection data. The bank's data will no longer be available. Returns an add_connection_url to re-connect if needed.
Part of the Banco MCP server.
Free to start. No card required.
AI agents use openfinance_disconnect_bank to create or modify resources in Banco MCP. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call openfinance_disconnect_bank repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Banco MCP.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"openfinance_disconnect_bank": {
"limits": [
{
"counter": "openfinance_disconnect_bank_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Banco MCP policy for all 22 tools.
These attack patterns abuse exactly the kind of access openfinance_disconnect_bank gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Revokes the Open Finance consent for a specific bank and deletes the connection data. The bank's data will no longer be available. Returns an add_connection_url to re-connect if needed.. It is categorised as a Write tool in the Banco MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Banco MCP server in PolicyLayer and add a rule for openfinance_disconnect_bank: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Banco MCP. Nothing to install.
openfinance_disconnect_bank is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the openfinance_disconnect_bank rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for openfinance_disconnect_bank. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
openfinance_disconnect_bank is provided by the Banco MCP server (https://api.mcp.ai/banco). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 22 Banco MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.