fhfa_hpi_series
Return a bounded FHFA House Price Index history for one US geography from LiveDataLink's self-hosted official snapshot. Includes stable FHFA place_id, geography level, year/period, adjusted and unadjusted index values, pagination, snapshot hash, and required attribution. Use this for 'show Califo...
This record as markdown: /tools/io-github-blackboxfoundry-livedatalink/fhfa-hpi-series.md
What fhfa_hpi_series does on Livedatalink
AI agents call fhfa_hpi_series 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 |
|---|---|---|---|
limit | integer | — | Maximum observations. Default 24. |
place | string | Yes | Exact FHFA place_id or geography name, such as 'CA', 'California', a 5-digit CBSA id, or an FHFA metro name. |
offset | integer | — | Observations to skip for pagination. Default 0. |
end_year | integer | — | Optional latest observation year. |
frequency | string | — | Observation frequency. Default quarterly. |
hpi_flavor | string | — | FHFA index flavor. Default purchase-only. |
start_year | integer | — | Optional earliest observation year. |
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_series is rated Low
Even though fhfa_hpi_series 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.
Risk signalsHigh parameter count (10 properties)
Attacks that exploit this kind of access
The rule that runs fhfa_hpi_series 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_series, this is the rule to start with:
fhfa_hpi_series 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_series call is checked against it from then on.
Questions about fhfa_hpi_series
Return a bounded FHFA House Price Index history for one US geography from LiveDataLink's self-hosted official snapshot. Includes stable FHFA place_id, geography level, year/period, adjusted and unadjusted index values, pagination, snapshot hash, and required attribution. Use this for 'show California house-price history', 'chart the Austin metro HPI', or as a federal price-index leg alongside realestate_trend. The index measures average price change; it is not a property value or appraisal. It is categorised as a Read tool in the Livedatalink MCP Server, which means it retrieves data without modifying state.
fhfa_hpi_series accepts 10 parameters: limit, place, offset, end_year, frequency, hpi_flavor, start_year, index_basis, geography_level, response_format. Required: place. 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_series: 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_series 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_series 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_series. 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_series 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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