v1.1.2

Highlights & Feature Summary

MCP & Agent Improvements

• Base Data Commons Federation in MCP: MCP tools on DCP instances can now seamlessly query and retrieve Base Data Commons indicators and time-series data thanks to the SDMX federation mentioned below.

SDMX Improvements & Query Federation

• SDMX Federation: Data and availability endpoints support query federation across both local Spanner and remote Base Data Commons.
• Download Filename Headers: Added automatic Content-Disposition: attachment; filename="dc_data.csv" headers to SDMX-CSV exports.

Minor Fixes & Website Changes

• Spanner Place Resolution Ranking: Fixed /v2/resolve candidate ordering to prioritize major population centers over alphabetical DCID matches.
• Staleness Tracking & Query Isolation: Added spanner_staleness_timestamp to the /version API and Web UI, actively exposing the running ingestion snapshot timestamp and ensuring user-facing queries serve without lock contention during Dataflow pipeline runs.
• Anti-5xx Alert Hygiene: Mapped client input errors (corrupted pagination nextToken, empty reconnaissance queries, invalid formula syntax) to HTTP 400 Bad Request instead of HTTP 500 to eliminate false-positive server alert spikes.
• Place Explorer Child Names: Fixed child place listings in the Place Explorer (/place/<dcid>) to paginate property lookups, properly displaying human-readable place names instead of raw DCIDs.

Known Issues:

• datacommonsorg/mixer#2077 — Enables topic expansion in MCP, however it relies on relevantVariableList property on Topics which is not automatically populated in DCP Ingestion pipeline. This will be fixed in a follow up release. Current workaround is to manually add the property in MCF.

Relevant PR Changelist

datacommonsorg/mixer

• datacommonsorg/mixer#2077 — Add ResolvePlaces API, tabular place_dcids, and Spanner topic expansion
• datacommonsorg/mixer#2083 — Fix place resolution by description ordering in the Spanner /v2/resolve flow
• datacommonsorg/mixer#2082 — Add download filename to SDMX-CSV responses
• datacommonsorg/mixer#2066 — Return gRPC InvalidArgument (HTTP 400) on client input errors to prevent 5xx alerts
• datacommonsorg/mixer#2073 — Add V2 internal SDMX endpoints and remote data source support
• datacommonsorg/mixer#2074 — Expose Spanner staleness timestamp in version response

datacommonsorg/website

• datacommonsorg/website#6546 — Show Spanner staleness timestamp on version page
• datacommonsorg/website#6544 — Paginate fetch_places to populate human-readable display names