io.github.physics-star-cat/databutler
REMOTE · DATABUTLER.DEV
Verified facts for AI agents: rates, exams, recalls, holidays, and what changed since your cutoff.
Available components
Last scanned (9 hours ago)
Scores higher than 87% of remote servers
Reachable. Last reached 5 Nov 2026.
Category Search and Retrieval
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security80
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability57
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 4573 tokens (~415/item across 11 items; 11 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety75
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- 0 of 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation; "take_home_pay" implies "pay" and declares readOnlyHint instead, contradicting what its own name says it does. See how to fix → Fail
- An AI judge read all 12 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 3 Nov 26 +1
- Stability: 0.97 → pass security
- 1 Nov 26 +1
- The server rewrote its instructions, which are the text every model session reads security
- Tool “call” rewrote its description, which is the text the model reads security
- Tool “catalogue” rewrote its description, which is the text the model reads security
- Tool “coverage” rewrote its description, which is the text the model reads security
- Tool “get_fact” rewrote its description, which is the text the model reads security
- Tool “what_changed_since” rewrote its description, which is the text the model reads security
- “coverage” reworded the description of “area” cosmetic
- 30 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 83 to 87. That category is still filling its 30-day observation window: 25 days of observed history at the previous scan, 26 at this one. The score rises as the window fills, whether or not the server changes.
- 27 Oct 26 +1
- The server rewrote its instructions, which are the text every model session reads security
- Tool “take_home_pay” rewrote its description, which is the text the model reads security
- “take_home_pay” reworded the description of “region” cosmetic
- 25 Oct 26 0
- The server rewrote its instructions, which are the text every model session reads security
- Tool “call” rewrote its description, which is the text the model reads security
- Tool “catalogue” rewrote its description, which is the text the model reads security
- Tool “coverage” rewrote its description, which is the text the model reads security
- Tool “what_changed_since” rewrote its description, which is the text the model reads security
- Schema quality: 339 → 385 ▼ functional
- “coverage” reworded the description of “area” cosmetic
- 24 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.
- 22 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 57 to 60. That category is still filling its 30-day observation window: 17 days of observed history at the previous scan, 18 at this one. The score rises as the window fills, whether or not the server changes.
- 20 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 50 to 53. That category is still filling its 30-day observation window: 15 days of observed history at the previous scan, 16 at this one. The score rises as the window fills, whether or not the server changes.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 5 Nov 2026 · Probed https://databutler.dev/api/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=databutler.dev | CN=YR2,O=Let's Encrypt,C=US | 1 Nov 2026 | 30 Jan 2027 | RSA 2048 | SHA256-RSA | 57e71073bd6e862c7a4f13070ec548fa698 |
| SANs: databutler.dev | ||||||
| CN=YR2,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | 4ebd24947e24d394802d84a52fd5b319 |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of databutler.dev. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| dev. | present | 60074 | 8 | Verified |
| databutler.dev. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=63072000 |
| x-content-type-options | nosniff |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://databutler.dev/api/mcp | Verified | 200 | |
| http (plaintext) | http://databutler.dev/api/mcp | HTTPS enforced | 308 | https://databutler.dev/api/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
call Call any tool ~769
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, social-security-benefits, medicare-costs, capital-gains); 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, vat); 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_gov_process (UK government services — passport and ETA fees, driving licence renewal, SORN, register to vote, birth/death registration, Self Assessment deadlines, NI number, Universal Credit, EU Settlement Scheme, eVisa — fees, processing times, sta…
| Name | Type | Req | Description |
|---|---|---|---|
| arguments | object | – | that tool's arguments |
| tool | string | yes | tool name from catalogue |
No output schema declared.
No examples provided.
catalogue Tool catalogue ~472
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, capital gains, IRMAA, RMD); German tax and social-insurance figures (de_rates_lookup: Einkommensteuertarif, Sozialversicherung, Mindestlohn, Minijob, Kindergeld, Kinderfreibetrag, Pauschbeträge, Entfernungspauschale, Umsatzsteuer); 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); UK inflation: CPI and CPIH 12-month rates, CPI index and annual averages (ONS); US inflation (us_inflation_lookup: BLS CPI-U 12-month rate, index level, annual averages)), 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.
| Name | Type | Req | Description |
|---|---|---|---|
| query | string | – | keyword filter, e.g. regression, exam, npm |
No output schema declared.
No examples provided.
coverage Coverage ~454
Exactly what Data Butler covers and does not, per area, including figures it does not serve yet. Areas: uk-rates, uk-exams, provenance, stats, vehicles, tax, software-eol, policy-rates, us-rates, de-rates, uk-vehicle-rules, uk-exam-dates, calendar, uk-gov-process, jp-vehicle-costs, jp-living-costs, uk-inflation, us-inflation (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, UK government services (passports, DVLA, voting, registrations, Self Assessment, benefits, eVisa, ETA), Japanese vehicle statutory cost categories (weight tax, 自賠責, inspection fees, car taxes), Japanese daily-life figure categories (minimum wage, health insurance, pension, employment insurance, benefits, holidays, consumption tax, income tax, resident tax), UK inflation categories (cpi, cpih), US CPI-U inflation (latest month, prior month, annual averages), and an explicit notCovered list.
| Name | Type | Req | Description |
|---|---|---|---|
| area | string | – | 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, uk-gov-process, jp-vehicle-costs, jp-living-cos… |
No output schema declared.
No examples provided.
domain_provenance Domain provenance ~99
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.
| Name | Type | Req | Description |
|---|---|---|---|
| domain | string | yes | e.g. example.com |
No output schema declared.
No examples provided.
exam_topic_paper Exam topic → paper ~191
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).
| Name | Type | Req | Description |
|---|---|---|---|
| board | string | – | e.g. aqa |
| level | string | – | e.g. gcse |
| subject | string | – | e.g. physics, combined science |
| topic | string | yes | e.g. electricity, forces, ecology, organic chemistry |
No output schema declared.
No examples provided.
get_fact Get a verified fact ~380
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. `nextExpectedChange` is the next date the source's calendar allows the value to move; `status` is `stale` when that date has passed since verification. 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.
| Name | Type | Req | Description |
|---|---|---|---|
| as_of | string | – | optional YYYY-MM-DD: the value in force that day |
| key | string | yes | one key, or several separated by commas (max 50), e.g. uk/income-tax/personal-allowance |
| max_age | string | – | optional freshness bar: 30d, 12w, 6m, 1y or ISO 8601 (P30D) |
| period | string | – | optional period label instead of as_of, e.g. 2025-26 |
No output schema declared.
No examples provided.
package_provenance Package provenance ~104
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.
| Name | Type | Req | Description |
|---|---|---|---|
| ecosystem | string | yes | npm or pypi |
| name | string | yes | package name, e.g. express or requests |
No output schema declared.
No examples provided.
resolve_fact Find the key for a fact ~120
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`).
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | default 5 |
| namespace | string | – | optional jurisdiction filter |
| q | string | yes | question or guessed key |
No output schema declared.
No examples provided.
take_home_pay Take-home pay ~369
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 and region (madrid|cataluna) for Spain. 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.
| Name | Type | Req | Description |
|---|---|---|---|
| country | string | yes | ISO 3166-1 alpha-2, lower case: uk, us, ca, au, in, br, pl, fr, de, es |
| filingStatus | string | – | US only (default single) |
| gross | number | yes | gross salary in local currency, annual unless period is monthly, e.g. 50000 |
| period | string | – | period of gross (default annual); results always give both annual and monthly |
| province | string | – | Canada only: two-letter province/territory code, e.g. BC (default ON) |
| region | string | – | UK: england | scotland | wales | northern-ireland (scotland applies Scottish income tax bands; default england). Spain: madrid | cataluna, the autonomous community whose IRPF scale applies (default m… |
| state | string | – | US only: two-letter state code, e.g. TX (default CA) |
No output schema declared.
No examples provided.
uk_rates_lookup UK rates lookup ~218
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, state-pension-age, stamp-duty, capital-gains, pensions, dividends, savings, marriage-allowance, statutory-sick-pay, statutory-parental-pay, child-benefit. Covers UK income tax, National Insurance, minimum wage, student loans, VAT, ISAs, pensions, stamp duty, capital gains, dividends, savings, the State Pension and State Pension age, statutory sick/maternity/paternity pay and Child Benefit.
| Name | Type | Req | Description |
|---|---|---|---|
| category | string | – | one of: income-tax, national-insurance, minimum-wage, student-loans, vat, isa, state-pension, state-pension-age, stamp-duty, capital-gains, pensions, dividends, savings, marriage-allowance, statutory… |
No output schema declared.
No examples provided.
what_changed_since What changed since ~573
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, Umsatzsteuer), 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), UK government service fees and rules (passports, ETA, Universal Credit, eVisa), Japanese vehicle statutory costs (車検 inspection fees, 自賠責 insurance rates), Japanese minimum wages by prefecture, 協会けんぽ health insurance rates, 雇用保険料率 and income-tax deductions, UK CPI and CPIH inflation rates (ONS, monthly) and US inflation (BLS CPI-U 12-month rate and index, each monthly release) 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, jp-vehicle-costs, jp-living-costs, uk-inflation, us-inflation, 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.…
| Name | Type | Req | Description |
|---|---|---|---|
| area | string | – | default all |
| since | string | yes | ISO date YYYY-MM-DD, e.g. your training cutoff |
No output schema declared.
No examples provided.
How do I install the io.github.physics-star-cat/databutler MCP server?
io.github.physics-star-cat/databutler is a hosted endpoint at https://databutler.dev/api/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · databutler.dev
claude mcp add --transport http physics-star-cat-databutler 'https://databutler.dev/api/mcp'
What is the io.github.physics-star-cat/databutler MCP server?
io.github.physics-star-cat/databutler is an MCP server listed in the public MCP registry as io.github.physics-star-cat/databutler. Verified facts for AI agents: rates, exams, recalls, holidays, and what changed since your cutoff. This page covers its hosted endpoint (https://databutler.dev/api/mcp).
Is the io.github.physics-star-cat/databutler MCP server safe to use?
io.github.physics-star-cat/databutler scores 83 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the io.github.physics-star-cat/databutler MCP server expose?
io.github.physics-star-cat/databutler exposes 11 tools: uk_rates_lookup, exam_topic_paper, domain_provenance, package_provenance, take_home_pay, and 6 more. Their descriptions and schemas cost roughly 3,749 tokens of context every time the server is loaded.
Does the io.github.physics-star-cat/databutler MCP server require authentication?
No. We connected to io.github.physics-star-cat/databutler without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the io.github.physics-star-cat/databutler MCP server still maintained?
io.github.physics-star-cat/databutler is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.