Subscribe the user to alerts for new Cyclesite listings matching a filter — the AI assistant will then proactively notify them when a matching bike appears (price drop or fresh listing). Requires OAuth scope listings:read (read-only on data, but this is technically a write — it creates a SavedSea...
Part of the Cyclesite The UKs Trusted bike marketplace server.
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AI agents use save_search 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 save_search 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": {
"save_search": {
"limits": [
{
"counter": "save_search_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 save_search 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.
Subscribe the user to alerts for new Cyclesite listings matching a filter — the AI assistant will then proactively notify them when a matching bike appears (price drop or fresh listing). Requires OAuth scope listings:read (read-only on data, but this is technically a write — it creates a SavedSearch row on the user's account). Examples: 'let me know when a Trek Domane SL 6 in Manchester under £2,000 appears', 'alert me to any e-MTB drops below £2,500 in Yorkshire'. Each user is capped at 50 active alerts.. 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 save_search: 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.
save_search 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 save_search 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 save_search. 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.
save_search 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.
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