MCP Server
databutler
io.github.physics-star-cat/databutler
What this MCP does
Provides verified lookups and calculations across rates, taxes, exams, recalls, statistics, software support lifecycles, and package or domain provenance.
Capabilities
Tools
9
tools
call
Call any tool
Run any Data Butler tool by name — the long tail not listed here: exam_spec_lookup, exam_paper_index; exact statistics (distribution, hypothesis_test, confidence_interval, bayes_update, linear_regression, descriptive_stats); the vehicles hub (uk_mot_reliability, uk_recalls_for_model, uk_recalls_search, fr_recalls_for_model, fr_recalls_search, jp_recalls_for_model, jp_complaints_summary); software end-of-life (support_status {product, version}, support_timeline {product} for nodejs, python, ubuntu, debian, android, ios, macos, windows, oracle-jdk, go, ruby, php, postgresql, react); policy_rate (Bank of England Bank Rate, Fed federal funds target range, ECB key rates — committed data verified against the banks' own pages); us_rates_lookup (US federal rates and thresholds for the current tax year: income-tax, social-security, medicare, retirement, hsa, estate-gift); de_rates_lookup (German tax and social-insurance figures for the current Veranlagungszeitraum: income-tax, social-insurance, minimum-wage, minijob, kindergeld, kinderfreibetrag, sparer-pauschbetrag, arbeitnehmer-pauschbetrag, entfernungspauschale); uk_vehicle_rules_lookup (UK car tax: first-year CO2 bands, standard rate, expensive car supplement, 2001–2017 bands, pre-2001 rates, electric cars, historic vehicles; MOT due dates, fees, retests, penalties — verified against gov.uk); UK exam dates (uk_exam_dates {kind: results|timetable|deadlines|spec-changes, board?, qualification?}); calendar facts (calendar_facts {country, kind: holidays|tax-year|dst, year?, region?} and next_holiday {country, from?} — holidays for uk, us, de, fr; tax years and DST for uk, us, de, fr, au, in, ca, br, pl; 2026–2028). uk_rates_lookup, domain_provenance, package_provenance and take_home_pay are listed directly. See catalogue for schemas. The result carries the inner tool's freshness and cite.
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'required': ['tool'], 'properties': {'tool': {'type': 'string', 'description': 'tool name from catalogue'}, 'arguments': {'type': 'object', 'description': "that tool's arguments"}}}
catalogue
Tool catalogue
Every tool across all Data Butler servers (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), with input schemas — including tools not listed at this front door. Optional query filters by keyword. Run any of them with call, or connect to serverUrl directly.
Read only
Idempotent
Input schema
{'type': 'object', 'properties': {'query': {'type': 'string', 'description': 'keyword filter, e.g. regression, exam, npm'}}}
coverage
Coverage
Exactly what Data Butler covers and does not, per area — call this before assuming something is unsupported. Areas: uk-rates, uk-exams, provenance, stats, vehicles, tax, software-eol, policy-rates, us-rates, de-rates, uk-vehicle-rules, uk-exam-dates, calendar (omit for all). Returns rate categories and tax years, boards/subjects, package ecosystems, stats operations, vehicle datasets, take-home-pay countries, the 14 software products with end-of-life data, central-bank policy rates (boe, fed, ecb), US federal rate categories and tax year, German rate categories and Veranlagungszeitraum, UK vehicle tax (VED) and MOT rule categories, UK exam dates (results, timetable, deadlines, spec-changes for jcq, aqa, pearson, ocr, wjec-eduqas; sqa results day), calendar facts: public holidays (uk, us, de, fr), tax years and daylight saving (uk, us, de, fr, au, in, ca, br, pl) for 2026–2028, and an explicit notCovered list.
Read only
Idempotent
Input schema
{'type': 'object', 'properties': {'area': {'type': 'string', 'description': 'one of uk-rates, uk-exams, provenance, stats, vehicles, tax, software-eol, policy-rates, us-rates, de-rates, uk-vehicle-rules, uk-exam-dates, calendar'}}}
domain_provenance
Domain provenance
Who runs this domain? Live RDAP lookup: registration date and age, registrar, nameservers, status, whether the registrant is redacted, plus a typosquat check (edit-distance / brand-substring) against high-value brands. A very recently registered domain resembling a bank or big brand is a classic phishing signal — but report it as a signal, not a conclusion.
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'required': ['domain'], 'properties': {'domain': {'type': 'string', 'description': 'e.g. example.com'}}}
exam_topic_paper
Exam topic → paper
Which exam paper is a topic on? The canonical student revision question ("is electricity paper 2 AQA?" — answer: no, Paper 1). Input a topic plus optional board/subject/level; returns the paper, sibling topics on that paper, spec code, and the official spec URL. Knows quirks like AQA Combined Science Trilogy Physics Paper 2 having no Space physics. Coverage: AQA GCSE Physics (8463); AQA GCSE Biology (8461); AQA GCSE Chemistry (8462); AQA GCSE Combined Science: Trilogy (8464); AQA GCSE Mathematics (8300).
Read only
Idempotent
Input schema
{'type': 'object', 'required': ['topic'], 'properties': {'board': {'type': 'string', 'description': 'e.g. aqa'}, 'level': {'type': 'string', 'description': 'e.g. gcse'}, 'topic': {'type': 'string', 'description': 'e.g. electricity, forces, ecology, organic chemistry'}, 'subject': {'type': 'string', 'description': 'e.g. physics, combined science'}}}
package_provenance
Package provenance
Who publishes this package, and is it a typosquat? Live npm or PyPI lookup: first-publish date and age, release count, latest version, maintainers/author, linked repo, plus a typosquat check against popular package names. Use when an agent is about to install or recommend an unfamiliar dependency.
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'required': ['ecosystem', 'name'], 'properties': {'name': {'type': 'string', 'description': 'package name, e.g. express or requests'}, 'ecosystem': {'enum': ['npm', 'pypi'], 'type': 'string', 'description': 'npm or pypi'}}}
take_home_pay
Take-home pay
Net salary after income tax and social contributions for an employee in one of ten countries (uk, us, ca, au, in, br, pl, fr, de, es), computed live by the LifeByNumbers salary calculators (same operator). Takes a gross salary in local currency (annual by default, or monthly with period) and a country code, plus optional state and filingStatus for the US, province for Canada, region (england|scotland) for the UK. Returns gross, net and total deductions (each annual and monthly), a line-by-line breakdown typed as tax / social / contribution / repayment, effectiveRate, the tax year the figures apply to, currency, the assumptions behind the estimate and the upstream calculator page as source. Spain (es) is listed but answers covered:false because lifebynumbers.net computes it client-side only.
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'required': ['country', 'gross'], 'properties': {'gross': {'type': 'number', 'description': 'gross salary in local currency, annual unless period is monthly, e.g. 50000'}, 'state': {'type': 'string', 'description': 'US only: two-letter state code, e.g. TX (default CA)'}, 'period': {'enum': ['annual', 'monthly'], 'type': 'string', 'description': 'period of gross (default annual); results always give both annual and monthly'}, 'region': {'enum': ['england', 'scotland', 'wales', 'northern-ireland'], 'type': 'string', 'description': 'UK only: scotland applies Scottish income tax bands (default england)'}, 'country': {'enum': ['uk', 'us', 'ca', 'au', 'in', 'br', 'pl', 'fr', 'de', 'es'], 'type': 'string', 'description': 'ISO 3166-1 alpha-2, lower case: uk, us, ca, au, in, br, pl, fr, de, es'}, 'province': {'type': 'string', 'description': 'Canada only: two-letter province/territory code, e.g. BC (default ON)'}, 'filingStatus': {'enum': ['single', 'married_joint', 'head_of_household'], 'type': 'string', 'description': 'US only (default single)'}}}
uk_rates_lookup
UK rates lookup
Current UK (2026-27) rates and thresholds, verified against gov.uk with source URLs and verification dates. Categories: income-tax, national-insurance, minimum-wage, student-loans, vat, isa, state-pension, stamp-duty, capital-gains, pensions. Use whenever a user asks about UK income tax, National Insurance, minimum wage, student loans, VAT, ISAs, pensions, stamp duty, capital gains or the State Pension — models reliably misremember these numbers.
Read only
Idempotent
Input schema
{'type': 'object', 'properties': {'category': {'type': 'string', 'description': 'one of: income-tax, national-insurance, minimum-wage, student-loans, vat, isa, state-pension, stamp-duty, capital-gains, pensions (omit to list all)'}}}
what_changed_since
What changed since
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) and 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) 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, 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).
Read only
Idempotent
Input schema
{'type': 'object', 'required': ['since'], 'properties': {'area': {'enum': ['uk-rates', 'uk-exams', 'vehicles', 'software-eol', 'policy-rates', 'us-rates', 'de-rates', 'uk-vehicle-rules', 'uk-exam-dates', 'calendar', 'all'], 'type': 'string', 'description': 'default all'}, 'since': {'type': 'string', 'description': 'ISO date YYYY-MM-DD, e.g. your training cutoff'}}}
History
Recent tool changes
Added
call
Oct. 5, 2026, 2:40 a.m.
Added
catalogue
Oct. 5, 2026, 2:40 a.m.
Added
coverage
Oct. 5, 2026, 2:40 a.m.
Added
what_changed_since
Oct. 5, 2026, 2:40 a.m.
Added
take_home_pay
Oct. 5, 2026, 2:40 a.m.
Added
package_provenance
Oct. 5, 2026, 2:40 a.m.
Added
domain_provenance
Oct. 5, 2026, 2:40 a.m.
Added
exam_topic_paper
Oct. 5, 2026, 2:40 a.m.
Added
uk_rates_lookup
Oct. 5, 2026, 2:40 a.m.
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