Create a reservation and initiate payment. Returns a payment URL for the customer.
Part of the Travel server.
Free to start. No card required.
AI agents use booking_reserve to create or modify resources in Travel. 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 booking_reserve 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 Travel.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"booking_reserve": {
"limits": [
{
"counter": "booking_reserve_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Travel policy for all 11 tools.
These attack patterns abuse exactly the kind of access booking_reserve 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.
Create a reservation and initiate payment. Returns a payment URL for the customer.. It is categorised as a Write tool in the Travel MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Travel MCP server in PolicyLayer and add a rule for booking_reserve: 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 Travel. Nothing to install.
booking_reserve 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 booking_reserve 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 booking_reserve. 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.
booking_reserve is provided by the Travel MCP server (@tixxly-ai/travel-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 11 Travel 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.