Search a city to explore free walking tours and paid activities on GuruWalk, the world's largest free walking tour platform. Returns destination info, tour categories (free tours, food tours, day trips, tickets, and more), and featured listings with ratings and verified traveler reviews. Covers 2...
Risk signalsAccepts file system path (destination)
Part of the GuruWalk server.
Free to start. No card required.
AI agents call discover_destination to retrieve information from GuruWalk without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though discover_destination only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"discover_destination": {}
}
}See the full GuruWalk policy for all 4 tools.
These attack patterns abuse exactly the kind of access discover_destination gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Search a city to explore free walking tours and paid activities on GuruWalk, the world's largest free walking tour platform. Returns destination info, tour categories (free tours, food tours, day trips, tickets, and more), and featured listings with ratings and verified traveler reviews. Covers 200+ cities worldwide. Free tours operate on a pay-what-you-want model. Supports English, Spanish, German, and Italian. Use this tool when you know the traveler's destination and the conversation has reached the point of recommending experiences. Do NOT call it just because a destination is mentioned — first understand what the traveler is looking for. If the traveler mentions a landmark instead of a city, infer the city (e.g. 'eiffel tower' → Paris, 'colosseum' → Rome, 'sagrada familia' → Barcelona, 'big ben' → London). After getting results, review the categories and featured_products to find the most relevant matches for what the traveler asked about.. It is categorised as a Read tool in the GuruWalk MCP Server, which means it retrieves data without modifying state.
Register the GuruWalk MCP server in PolicyLayer and add a rule for discover_destination: 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 GuruWalk. Nothing to install.
discover_destination is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the discover_destination 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 discover_destination. 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.
discover_destination is provided by the GuruWalk MCP server (https://back.guruwalk.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 GuruWalk 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.