Open Index MCP server

• Registry nameuk.co.openindex/open-indexverified in the MCP registry

The registry name sits under openindex.co.uk. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

• Stateanswerschecked 2026-10-28
• Tools7
• Server calls itselfopen-index
• Server version2026.10.11
• Protocol version2025-06-18

On 2026-10-28 the server answered initialize and tools/list without a sign-in. First answer in 102 ms.

• Its tools do every use case we checked: compare average house prices across UK councils; check crime and deprivation levels for a neighbourhood.
• Checked on 6 of the 7 days it takes to judge reliability.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

• INITE MCP scoreafter a weeka score needs 7 daily checks: 6 so far
• What an agent can do with it2 of 2 use cases
• Answeredmeasuring6 of the 7 daily checks it takes to print a share
• Median first answer66 ms
• Space in an agent's context≈ 974 tokensthe definitions of all its tools (7), which an agent carries on every turn
• Tool definitionsA · 90 of 100
• Typed results2 of 7 toolsdeclared outputSchema: results come typed, read once

• Parameters without a description: in 4 of 7

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

• search_places

  Find UK places (nations, regions, councils, constituencies, towns, wards, neighbourhoods) and postcodes by name, with each one's official code, level and page URL. Also lists matching data layers.

• get_place

  Published figures for one UK area: key figures by default, or every figure in one topic. Each figure has its period, publication date, rank, comparisons, source and a link to the figure on its page.

• get_ranking

  Councils ranked on one measure across the UK, a nation or an English region, for the latest period. Measures each nation makes its own way (such as deprivation) are ranked within one nation only.

• compare_places

  Two UK areas of the same level side by side on the same published figures, each with its own period and source. Key figures by default.

• lookup_postcode

  The areas a Great Britain postcode sits in (council, constituency, ward, neighbourhood and more) with their codes and pages. A district (E8) or sector (E8 1) gives its councils. Northern Ireland postcodes are not available.

• search

  Find UK area overview documents by place name for research, with canonical page paths, titles and citation URLs. Great Britain postcodes identify their published area. No Northern Ireland postcodes.

• fetch

  Read one UK area's overview figures by its canonical page path. Includes periods, sources, licences, gaps and citation links at the published level of detail.