Email the booking's client their assigned driver's first name + phone. Pass email if you already have the client's address (e.g. from Zeplan get-booking); otherwise WP looks it up on the booking post. Returns { sent, to (masked), client_phone }. Voice agent use.
Part of the Booking server.
Free to start. No card required.
AI agents use send_driver_contact to create or modify resources in Booking. 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 send_driver_contact 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 Booking.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"send_driver_contact": {
"limits": [
{
"counter": "send_driver_contact_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Booking policy for all 8 tools.
These attack patterns abuse exactly the kind of access send_driver_contact 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.
Email the booking's client their assigned driver's first name + phone. Pass email if you already have the client's address (e.g. from Zeplan get-booking); otherwise WP looks it up on the booking post. Returns { sent, to (masked), client_phone }. Voice agent use.. It is categorised as a Write tool in the Booking MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Booking MCP server in PolicyLayer and add a rule for send_driver_contact: 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 Booking. Nothing to install.
send_driver_contact 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 send_driver_contact 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 send_driver_contact. 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.
send_driver_contact is provided by the Booking MCP server (https://mcp-mydriverparis.mydriverparis.workers.dev/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 8 Booking 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.