Get freshly listed properties (under one week on market) for a region (e.g., "Boston, MA"). Returns address, price, beds, baths, and listing date.
Part of the Altos server.
Free to start. No card required.
AI agents invoke altos_new_listings to trigger processes or run actions in Altos. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.
altos_new_listings can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. PolicyLayer enforces rate limits and validates arguments to keep execution within safe bounds.
Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.
{
"version": "1",
"default": "deny",
"tools": {
"altos_new_listings": {
"limits": [
{
"counter": "altos_new_listings_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}See the full Altos policy for all 26 tools.
These attack patterns abuse exactly the kind of access altos_new_listings gives an agent. Each links to the full case and the policy that stops it:
Other execute tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Get freshly listed properties (under one week on market) for a region (e.g., "Boston, MA"). Returns address, price, beds, baths, and listing date.. It is categorised as a Execute tool in the Altos MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Altos MCP server in PolicyLayer and add a rule for altos_new_listings: 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 Altos. Nothing to install.
altos_new_listings is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the altos_new_listings 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 altos_new_listings. 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.
altos_new_listings is provided by the Altos MCP server (https://gateway.pipeworx.io/altos/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 26 Altos 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.