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8 clients · secrets stay placeholders

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{
  "mcpServers": {
    "databutler-facts": {
      "type": "http",
      "url": "https://databutler.dev/api/mcp/facts"
    }
  }
}

claude mcp add --transport http databutler-facts https://databutler.dev/api/mcp/facts

[mcp_servers.databutler-facts]
url = "https://databutler.dev/api/mcp/facts"

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "databutler-facts": {
      "type": "remote",
      "url": "https://databutler.dev/api/mcp/facts",
      "enabled": true
    }
  }
}

{
  "mcpServers": {
    "databutler-facts": {
      "type": "http",
      "url": "https://databutler.dev/api/mcp/facts"
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=databutler-facts&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8vZGF0YWJ1dGxlci5kZXYvYXBpL21jcC9mYWN0cyJ9"
}

{
  "servers": {
    "databutler-facts": {
      "type": "http",
      "url": "https://databutler.dev/api/mcp/facts"
    }
  }
}

{
  "mcpServers": {
    "databutler-facts": {
      "httpUrl": "https://databutler.dev/api/mcp/facts"
    }
  }
}

extensions:
  "databutler-facts":
    enabled: true
    name: "databutler-facts"
    type: streamable_http
    uri: "https://databutler.dev/api/mcp/facts"
    timeout: 300

Quality 88 / 100good

protocol75 · weight 25

warn
protocol.modernnewest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
n/a
protocol.statelessonly applies to 2026-07-28 servers
pass
protocol.transportstreamable HTTP
n/a
protocol.list_ttlonly applies to 2026-07-28 servers

authorizationn/a · weight 15

n/a
auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
n/a
auth.secret_in_urlno templated URL

tool hygiene93 · weight 30

pass
tools.descriptionsevery tool has a description
warn
tools.description_length1 tools have descriptions over 1,024 characters, which crowds the context
pass
tools.schemasevery tool has an object input schema
pass
tools.annotations3 of 3 tools declare readOnlyHint or destructiveHint
pass
tools.directory_hintsevery tool declares readOnlyHint, destructiveHint, idempotentHint and openWorldHint
pass
tools.token_costabout 1,146 tokens to load every tool
pass
tools.api_dumptools are not a one-to-one API dump

stability100 · weight 15

pass
stability.changesno tool changes in 30 days
pass
stability.rug_pullno tool changed its meaning under the same name

dependenciesn/a · weight 15

n/a
deps.known_vulns, deps.mcp_sdk_version, deps.resolvableno npm or PyPI package

3 tools, about 1,146 tokens to load them all · tool set 64036bf9fa71 · checked 2026-10-20 13:17 UTC

Tool changes

No tool definition changes recorded. A server's first observation is its baseline; later probes record what changes.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 93 / 100

duplicate-repo

provenance90

liveness100

freshness100

hygiene80

+repository +namespace-matches-repo +website +reachable +uptime-100% +updated-7d-ago -duplicate-repo(16 names)

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Endpoints

remote	auth	reachable	uptime 30d	p50	protocol	last ok
`https://databutler.dev/api/mcp/facts` streamable-http	none	yes	100%	284 ms	2025-11-25	2026-10-20

Tools (3)

`get_fact`read-only	The current value of one official figure by key — a tax threshold, rate, allowance, fee, deadline, limit or policy rate — with the date it was verified, the official source URL, the period it applies to and a signature. Keys are `<country>/<topic>/<fact>`, e.g. `uk/income-tax/personal-allowance`, `uk/national-insurance/primary-threshold`, `us/social-security/wage-base`, `de/income-tax/grundfreibetrag`, `uk/bank-rate`, `eu/ecb/deposit-facility`, `uk/gov/passport-renewal-adult/fee-online-uk`. A loose key is resolved when unambiguous; otherwise the answer lists candidate keys. `max_age` (e.g. `30d`) marks the answer `stale` when the verification is older than that. Several keys separated by commas return a batch. Covers UK, US and German rates and thresholds, UK vehicle tax and MOT rules, UK government service fees, UK exam dates and central-bank policy rates; `coverage` lists the rest.
`resolve_fact`read-only	Ranked canonical fact keys for a plain-language question or a guessed key — "NI primary threshold", "ECB deposit rate", "passport renewal fee" — each with label, unit, period and verification date, and the full record of the top match when it is unambiguous. The keys feed `get_fact`. Filter by `namespace` (`uk`, `us`, `de`, `eu`).
`what_changed_since`read-only	What has changed in Data Butler's verified datasets since a date — pass your training-cutoff date to learn which UK tax/NI/benefit thresholds, exam-spec facts, official vehicle datasets (UK DVSA, French RappelConso and Japanese MLIT recalls), software end-of-life dates (Node.js, Python, Ubuntu, Debian, Android, iOS, macOS, Windows, Java, Go, Ruby, PHP, PostgreSQL, React — cycles that reached end of life or whose dates moved), central-bank policy rates (Bank of England, Fed, ECB), US federal tax thresholds (IRS inflation adjustments, Social Security wage base, retirement and HSA limits), German tax and social-insurance thresholds (Grundfreibetrag, Beitragsbemessungsgrenzen, Zusatzbeitrag, Mindestlohn, Kindergeld), UK vehicle tax (VED) rates and MOT rules, UK exam dates (results days, summer timetable paper dates, entry deadlines and late-fee dates, announced specification changes), calendar facts (public holidays for the UK, US, Germany and France; tax-year and daylight-saving rules for nine countries — new years published, holidays added or moved) and UK government service fees and rules (passports, ETA, Universal Credit, eVisa) changed after your knowledge ends. Each entry: from → to, effectiveFrom, official source, verifiedDate, and a maintainer note (e.g. which Budget). Areas: uk-rates, uk-exams, vehicles, software-eol, policy-rates, us-rates, de-rates, uk-vehicle-rules, uk-exam-dates, calendar, uk-gov-process, or all. Coverage starts 2026-08-31. The same changelog is published for humans at https://databutler.dev/changes, with feeds at https://databutler.dev/changes.rss and https://databutler.dev/changes.atom. Output is a Verified Changes protocol document (verified-changes/0.1, spec https://databutler.dev/protocol); an entry whose figure is a Verified Fact carries factKey for get_fact.

Schemas: list_tools.

Also listed as

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Official server.json

{
  "name": "io.github.physics-star-cat/databutler-facts",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "remotes": [
    {
      "url": "https://databutler.dev/api/mcp/facts",
      "type": "streamable-http"
    }
  ],
  "version": "1.0.0",
  "repository": {
    "url": "https://github.com/physics-star-cat/databutler",
    "source": "github"
  },
  "websiteUrl": "https://databutler.dev/api",
  "description": "Official thresholds, rates and fees by key, with source, verified date and signature."
}