Data Butler

Data Butler is a reference-data server for AI assistants, built for the facts models misremember.

Every result carries an official source URL, a verifiedDate with a staleness flag, and a cite.url permalink a person can open to see the answer next to its source. No accounts, no API keys, no stored data.

MCP connector

Server URL: https://databutler.dev/api/mcp
Login: None
Protocol: MCP 2025-11-25
Instructions: Data Butler (databutler.dev): official reference figures, each returned with its official source URL and the date a person verified it against that source. returns one figure by key — a threshold, rate, allowance, fee or deadline — with value, period, effectiveFrom, source, verifiedDate, a fresh/stale flag and an Ed25519 signature; turns a plain-language question into a key. returns every verified figure that changed after a given date (UK, US and German tax thresholds, policy rates, exam-spec facts), with before and after values, the effective date and the Budget or spec change behind each. returns the current UK tax-year rates and thresholds verified against gov.uk. returns net pay computed live by the LifeByNumbers calculators for us, uk, ca, au, in, br, de, fr, pl and es, with its taxYear and assumptions. coverage returns exactly what each area covers and does not. The tools listed here are the high-frequency set; catalogue lists every tool on every Data Butler server (UK rates; UK exams; provenance; exact statistics; vehicles: UK MOT, UK, French and Japanese recalls; take-home pay for ten countries; software support status and end-of-life timelines for 14 runtimes and operating systems; central-bank policy rates: Bank of England, Fed, ECB; US federal rates and thresholds (us_rates_lookup: income tax, Social Security, Medicare, retirement, HSA, estate and gift); German tax and social-insurance figures (de_rates_lookup: Einkommensteuertarif, Sozialversicherung, Mindestlohn, Minijob, Kindergeld, Kinderfreibetrag, Pauschbeträge, Entfernungspauschale); UK vehicle tax (VED) and MOT rules; UK exam dates and spec changes: results days, the summer 2027 timetable, entry deadlines, new specifications; calendar facts: public holidays, tax-year starts and daylight-saving switches for 2026–2028; UK government services: passport, driving licence, vehicle tax/SORN, voting, birth/death registration, Blue Badge, Self Assessment, NI number, Universal Credit, EU Settlement Scheme, eVisa, ETA; Japan vehicle statutory costs (jp_vehicle_costs_lookup: 自動車重量税, エコカー減税, 自賠責保険, 検査手数料, 自動車税, 軽自動車税); Japan daily-life official figures (jp_living_costs_lookup: 最低賃金, 健康保険料率, 年金, 雇用保険, 児童手当, 高額療養費, 祝日, 消費税, 基礎控除, 住民税)) and call runs any of them by name. policy_rate returns the current Bank of England, Fed and ECB policy rates, each read from the bank's own page, with effectiveFrom, verifiedDate and the next scheduled decision. US federal figures (IRS brackets and standard deduction, Social Security wage base, 401(k)/IRA/HSA limits, estate and gift exclusions) are returned by us_rates_lookup (via call), each read from the IRS or SSA release with verifiedDate. German figures (Grundfreibetrag and tariff, Beitragsbemessungsgrenzen and Beitragssätze, Mindestlohn, Minijob limit, Kindergeld, Pauschbeträge) are returned by de_rates_lookup (via call), each read from the statute or ministry page with verifiedDate. Every result carries freshness (verifiedDate, staleness) and cite.url, a permalink a human can open to see the answer with its official source.

Tools

Reads data11

Skills

None in the store listings or on the server

MCP connector

Server URL

https://databutler.dev/api/mcp

None

Protocol

MCP 2025-11-25

Instructions

Data Butler (databutler.dev): official reference figures, each returned with its official source URL and the date a person verified it against that source. returns one figure by key — a threshold, rate, allowance, fee or deadline — with value, period, effectiveFrom, source, verifiedDate, a fresh/stale flag and an Ed25519 signature; turns a plain-language question into a key. returns every verified figure that changed after a given date (UK, US and German tax thresholds, policy rates, exam-spec facts), with before and after values, the effective date and the Budget or spec change behind each. returns the current UK tax-year rates and thresholds verified against gov.uk. returns net pay computed live by the LifeByNumbers calculators for us, uk, ca, au, in, br, de, fr, pl and es, with its taxYear and assumptions. coverage returns exactly what each area covers and does not. The tools listed here are the high-frequency set; catalogue lists every tool on every Data Butler server (UK rates; UK exams; provenance; exact statistics; vehicles: UK MOT, UK, French and Japanese recalls; take-home pay for ten countries; software support status and end-of-life timelines for 14 runtimes and operating systems; central-bank policy rates: Bank of England, Fed, ECB; US federal rates and thresholds (us_rates_lookup: income tax, Social Security, Medicare, retirement, HSA, estate and gift); German tax and social-insurance figures (de_rates_lookup: Einkommensteuertarif, Sozialversicherung, Mindestlohn, Minijob, Kindergeld, Kinderfreibetrag, Pauschbeträge, Entfernungspauschale); UK vehicle tax (VED) and MOT rules; UK exam dates and spec changes: results days, the summer 2027 timetable, entry deadlines, new specifications; calendar facts: public holidays, tax-year starts and daylight-saving switches for 2026–2028; UK government services: passport, driving licence, vehicle tax/SORN, voting, birth/death registration, Blue Badge, Self Assessment, NI number, Universal Credit, EU Settlement Scheme, eVisa, ETA; Japan vehicle statutory costs (jp_vehicle_costs_lookup: 自動車重量税, エコカー減税, 自賠責保険, 検査手数料, 自動車税, 軽自動車税); Japan daily-life official figures (jp_living_costs_lookup: 最低賃金, 健康保険料率, 年金, 雇用保険, 児童手当, 高額療養費, 祝日, 消費税, 基礎控除, 住民税)) and call runs any of them by name. policy_rate returns the current Bank of England, Fed and ECB policy rates, each read from the bank's own page, with effectiveFrom, verifiedDate and the next scheduled decision. US federal figures (IRS brackets and standard deduction, Social Security wage base, 401(k)/IRA/HSA limits, estate and gift exclusions) are returned by us_rates_lookup (via call), each read from the IRS or SSA release with verifiedDate. German figures (Grundfreibetrag and tariff, Beitragsbemessungsgrenzen and Beitragssätze, Mindestlohn, Minijob limit, Kindergeld, Pauschbeträge) are returned by de_rates_lookup (via call), each read from the statute or ministry page with verifiedDate. Every result carries freshness (verifiedDate, staleness) and cite.url, a permalink a human can open to see the answer with its official source.