AI agents use update_mobile to create or update resources in Mcp Mifosx — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Mifosx environment.
This tool modifies client information (phone number) reversibly within a financial institution's system. It is not destructive (the change can be undone), not financial (no money movement), and not code execution. The medium severity reflects the banking context where client data integrity is important, but the blast radius is limited to a single client contact field update.
From the tool's definition Tool name 'update_mobile' and description 'Update a client's phone number' indicate modification of existing client data in a core banking system.
Documented attack patterns abuse exactly the kind of access update_mobile gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Mifosx, and nothing reaches the server without passing your rules. This is the rule we recommend for update_mobile:
{
"version": "1",
"default": "deny",
"tools": {
"update_mobile": {
"limits": [
{
"counter": "update_mobile_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_mobile stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Update a client's phone number. It is categorised as a Write tool in the Mcp Mifosx MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mcp Mifosx MCP server in PolicyLayer and add a rule for update_mobile: 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 Mcp Mifosx. Nothing to install.
update_mobile 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 update_mobile 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 update_mobile. 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.
update_mobile is provided by the Mcp Mifosx MCP server (openmf/mcp-mifosx). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Mifosx, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
73 Mcp Mifosx tools catalogued and risk-classified — across an index of 43,000+ MCP servers.