fhfa_hpi_compare
Compare two to eight US geographies on a consistent FHFA HPI series and rank them by one-year price-index change. Returns latest level, one-year and five-year change, CAGR, recent direction, stable place_id/geography_level fields, and source provenance for later property-market evidence packs. Us...
This record as markdown: /tools/io-github-blackboxfoundry-livedatalink/fhfa-hpi-compare.md
What fhfa_hpi_compare does on Livedatalink
AI agents call fhfa_hpi_compare to retrieve information from Livedatalink without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
places | array | Yes | Two to eight exact FHFA place ids or geography names. |
frequency | string | — | Observation frequency. Default quarterly. |
hpi_flavor | string | — | FHFA index flavor. Default purchase-only. |
index_basis | string | — | Index column to use. Default seasonally_adjusted. |
geography_level | string | — | Optional exact FHFA geography level to disambiguate state, metro, division, or national series. |
response_format | string | — | Human-readable markdown or machine-readable JSON. Default markdown. |
Parameters from the server's own tool schema.
Why fhfa_hpi_compare is rated Low
Even though fhfa_hpi_compare only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
The rule that runs fhfa_hpi_compare safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Livedatalink, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For fhfa_hpi_compare, this is the rule to start with:
fhfa_hpi_compare is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Livedatalink, apply this rule, and every fhfa_hpi_compare call is checked against it from then on.
Questions about fhfa_hpi_compare
Compare two to eight US geographies on a consistent FHFA HPI series and rank them by one-year price-index change. Returns latest level, one-year and five-year change, CAGR, recent direction, stable place_id/geography_level fields, and source provenance for later property-market evidence packs. Use this for 'compare home-price momentum in Texas and Florida' or 'which of these metros has stronger five-year appreciation?'. Not a property valuation or investment recommendation. It is categorised as a Read tool in the Livedatalink MCP Server, which means it retrieves data without modifying state.
fhfa_hpi_compare accepts 6 parameters: places, frequency, hpi_flavor, index_basis, geography_level, response_format. Required: places. The full parameter table on this page comes from the server's own tool schema.
Register the Livedatalink MCP server in PolicyLayer and add a rule for fhfa_hpi_compare: 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 Livedatalink. Nothing to install.
fhfa_hpi_compare 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 fhfa_hpi_compare 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 fhfa_hpi_compare. 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.
fhfa_hpi_compare is provided by the Livedatalink MCP server (https://livedatalink.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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