Create a binding price quote that locks the price for 15 minutes for configured non-VRP fallback checkout deployments. Use only when no signed direct_booking_url is available and the user explicitly asks to lock or hold a price. Never use this for ordinary search, availability checks, demo/review...
Part of the Hemmabo server.
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AI agents use hemmabo_booking_negotiate to create or modify resources in Hemmabo. 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 hemmabo_booking_negotiate 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 Hemmabo.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"hemmabo_booking_negotiate": {
"limits": [
{
"counter": "hemmabo_booking_negotiate_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Hemmabo policy for all 15 tools.
These attack patterns abuse exactly the kind of access hemmabo_booking_negotiate 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 binding price quote that locks the price for 15 minutes for configured non-VRP fallback checkout deployments. Use only when no signed direct_booking_url is available and the user explicitly asks to lock or hold a price. Never use this for ordinary search, availability checks, demo/review proof, showing a verified host-domain offer, rendering a stay-offer widget, or booking a VRP offer; those requests must use get_verified_stay_offer and the signed direct host-domain booking URL instead. Returns quoteId, final host-source total, per-night breakdown, and expiry timestamp.. It is categorised as a Write tool in the Hemmabo MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Hemmabo MCP server in PolicyLayer and add a rule for hemmabo_booking_negotiate: 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 Hemmabo. Nothing to install.
hemmabo_booking_negotiate 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 hemmabo_booking_negotiate 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 hemmabo_booking_negotiate. 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.
hemmabo_booking_negotiate is provided by the Hemmabo MCP server (HemmaBo-se/hemmabo-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 15 Hemmabo tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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