ONS + Nomis MCP server (brynmrgn/ons-mcp) is an MCP server listed on the M8ven Trust Index. It scores 71 out of 100, grade C. It declares 18 tools. No publisher has claimed this listing.

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C
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71/100

ONS + Nomis MCP server

Provides access to UK economic, social, and labour-market statistics via the ONS beta and Nomis APIs, enabling discovery and retrieval of time series, datasets, and census data.

→ brynmrgn/ons-mcp· listed on glama

Limited view. Automated analysis covers part of this stack. Findings reflect what we verified. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.

Limited view: static analysis for C# is partially covered.

How we verified

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Who stands behind it

brynmrgn

Source: Glama

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Install from

Glamanot scored here

The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.

// key findings
✅
No credential exfiltration, no sensitive file access, no obfuscation
Static analysis found nothing flowing your secrets to unexpected places.
✅
Open source with a license and README
Anyone can audit the code, the license is declared, and the publisher documents what it does.
🔐
You'll be asked for 1 credential: NOMIS_API_KEY
These are read from process.env at runtime. Make sure you trust where they’ll be sent.
// environment variables
To run this server yourself, you supply these values. They go in your own MCP client configuration and stay on your machine. The secret label means the value is sensitive, not that the server mishandles it.
configCF_ACCESS_TEAM_DOMAINunset Cloudflare Access team domain; enables origin-side JWT checks (with CF_ACCESS_AUD)
configCF_ACCESS_AUDCF_ACCESS_TEAM_DOMAIN unset Cloudflare Access team domain; enables origin-side JWT checks (with )
configNOMIS_API_BASE
🔐 secretNOMIS_API_KEY() lifts limits for large queries.
configNOMIS_API_TIMEOUT60 Nomis per-request timeout (s)
configONS_API_BASE
configONS_API_TIMEOUT30 Per-request timeout (s)
configONS_MCP_HTTP1 ONS_MCP_PORT=8095 ons-mcp
configONS_MCP_PORTONS_MCP_HTTP=1 =8095 ons-mcp
// quality suggestions

Tool annotations

No tools have read-only/destructive annotations

Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.

All four hints declared on every tool

18/18 tools missing one or more hints — nomis_search_datasets (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); nomis_get_dataset (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); nomis_dimension_options (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +15 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.

For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.

Tool handlers catch errors

Only 1/18 tool handlers wrap calls in try/catch (6%)

Wrap each tool handler body in try/catch and return a structured error response.

Tests exist

No test files found

Add tests that exercise each declared tool.

Claim the listing to review these findings one by one and send us a correction where you disagree, straight to the team. Claiming also means we tell you when the grade moves, and reach you first if we find anything urgent.

// full audit trail
The findings above are the summary. The full trail, every check we ran, each deduction, the network hosts observed and the dependency advisories, goes to verified publishers, along with an alert whenever a new one lands. Verified publishers can also review each finding and dispute it in one click. Publisher corrections have sharpened several of our checks this month, because the maintainer knows the codebase better than any scanner.
// improvement guidance — verified publishers only
We have 4 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
// embed badge in your README
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commit: 4334e081dcfdc1a1b4843e67150b1ffb4adb4216
code hash: 30de6d08f151e4f481a8999b4dfae9b926a9b564c2f29fbbac07c93cd6c8145f
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