Update the GPS location for a card
Part of the Vigil Fraud Alert server.
Free to start. No card required.
AI agents use vigil_update_gps to create or modify resources in Vigil Fraud Alert. 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 vigil_update_gps 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 Vigil Fraud Alert.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"vigil_update_gps": {
"limits": [
{
"counter": "vigil_update_gps_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Vigil Fraud Alert policy for all 13 tools.
These attack patterns abuse exactly the kind of access vigil_update_gps 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.
Update the GPS location for a card. It is categorised as a Write tool in the Vigil Fraud Alert MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Vigil Fraud Alert MCP server in PolicyLayer and add a rule for vigil_update_gps: 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 Vigil Fraud Alert. Nothing to install.
vigil_update_gps 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 vigil_update_gps 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 vigil_update_gps. 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.
vigil_update_gps is provided by the Vigil Fraud Alert MCP server (ebenova/vigil-fraud-alert). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 13 Vigil Fraud Alert tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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