Hold a Cyclesite listing for 24 hours so other buyers can't claim it while the user decides. Optional refundable deposit via Stripe (returned if the user doesn't proceed; applied to the bike if they do). The first UK marketplace where a buyer can COMMIT inside an AI conversation. Requires OAuth s...
Part of the Cyclesite The UKs Trusted bike marketplace server.
Free to start. No card required.
AI agents use reserve_listing to create or modify resources in Cyclesite The UKs Trusted bike marketplace. 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 reserve_listing 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 Cyclesite The UKs Trusted bike marketplace.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"reserve_listing": {
"limits": [
{
"counter": "reserve_listing_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Cyclesite The UKs Trusted bike marketplace policy for all 31 tools.
These attack patterns abuse exactly the kind of access reserve_listing 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.
Hold a Cyclesite listing for 24 hours so other buyers can't claim it while the user decides. Optional refundable deposit via Stripe (returned if the user doesn't proceed; applied to the bike if they do). The first UK marketplace where a buyer can COMMIT inside an AI conversation. Requires OAuth scope listings:manage. Example: 'put a hold on that Trek for me, I want to view it Saturday'.. It is categorised as a Write tool in the Cyclesite The UKs Trusted bike marketplace MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Cyclesite The UKs Trusted bike marketplace MCP server in PolicyLayer and add a rule for reserve_listing: 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 Cyclesite The UKs Trusted bike marketplace. Nothing to install.
reserve_listing 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 reserve_listing 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 reserve_listing. 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.
reserve_listing is provided by the Cyclesite The UKs Trusted bike marketplace MCP server (cyclesite/bikes). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 31 Cyclesite The UKs Trusted bike marketplace tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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