Find recent comparable property sales and rental comps near a property. USE WHEN: user asks 'what are comps in this area', 'recent sales near here', 'what did similar houses sell for', 'price per square foot', 'market value estimate', 'rental comps', or needs comparable sales data. RETURNS: subje...
Part of the Buildability™ — Property Zoning & Buildability™ Intelligence server.
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AI agents call search_comparable_sales to retrieve information from Buildability™ — Property Zoning & Buildability™ Intelligence 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 search_comparable_sales 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": {
"search_comparable_sales": {}
}
}See the full Buildability™ — Property Zoning & Buildability™ Intelligence policy for all 8 tools.
These attack patterns abuse exactly the kind of access search_comparable_sales 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.
Find recent comparable property sales and rental comps near a property. USE WHEN: user asks 'what are comps in this area', 'recent sales near here', 'what did similar houses sell for', 'price per square foot', 'market value estimate', 'rental comps', or needs comparable sales data. RETURNS: subject property AVM, list of recent sales with price, sqft, price/sqft, distance, beds/baths, and rental comps with rent amounts. Also includes local market stats. Useful for investor deal evaluation, CMA, and market analysis.. It is categorised as a Read tool in the Buildability™ — Property Zoning & Buildability™ Intelligence MCP Server, which means it retrieves data without modifying state.
Register the Buildability™ — Property Zoning & Buildability™ Intelligence MCP server in PolicyLayer and add a rule for search_comparable_sales: 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 Buildability™ — Property Zoning & Buildability™ Intelligence. Nothing to install.
search_comparable_sales 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 search_comparable_sales 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 search_comparable_sales. 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.
search_comparable_sales is provided by the Buildability™ — Property Zoning & Buildability™ Intelligence MCP server (https://rnfonkwthefktfvfwypr.supabase.co/functions/v1/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 8 Buildability™ — Property Zoning & Buildability™ Intelligence tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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