Create a direct reservation for a SPECIFIC available opening (opening_id required). WHEN TO USE: - Call this AFTER check_availability has returned at least one opening AND the user has chosen which opening_id to book. - Required input includes an opening_id from check_availability. Do NOT call th...
Risk signalsHigh parameter count (15 properties)
Part of the Mcp server.
Free to start. No card required.
AI agents use create_reservation to create or modify resources in 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 create_reservation 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 Mcp.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"create_reservation": {
"limits": [
{
"counter": "create_reservation_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Mcp policy for all 11 tools.
These attack patterns abuse exactly the kind of access create_reservation 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 direct reservation for a SPECIFIC available opening (opening_id required). WHEN TO USE: - Call this AFTER check_availability has returned at least one opening AND the user has chosen which opening_id to book. - Required input includes an opening_id from check_availability. Do NOT call this tool without an opening_id. - If check_availability returned no openings, use create_reservation_request instead. REQUIRED FLOW (summary — see resource tableall://flow/direct-reservation for full details): 1. Call get_cancellation_policies and explain cancellation terms (MUST include: "Note: The booking fee is non-refundable regardless of cancellation timing."). 2. Ask the user ONLY for their email first. 3. Call this tool with email only. If response has error USER_NOT_FOUND, collect full name, country, phone, then call again. 4. Show a summary (restaurant, date/time, guests, course, email) and ask explicit confirmation BEFORE calling the tool with the final args. RESPONSE HANDLING: - Store data.access_token (required by get_reservation_status, otherwise 403). - If user.is_new_user is true, MUST display the password_reset_url notice (24-hour validity, also emailed) BEFORE the payment URL. - The payment_url is valid for 30 minutes and is also emailed. SEAT RULES: - Fixed seats: party_size MUST equal fixed_seats. - Flexible seats: party_size MUST be within min_seats and max_seats. For the full step-by-step flow (including exact wording to use with the user), read resource tableall://flow/direct-reservation.. It is categorised as a Write tool in the Mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the MCP server in PolicyLayer and add a rule for create_reservation: 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. Nothing to install.
create_reservation 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 create_reservation 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 create_reservation. 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.
create_reservation is provided by the MCP server (https://mcp.tableall.com/sse). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 11 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.