Spec Driven Development
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
Descripción del creador (original en inglés)
Verified facts for AI agents: rates, exams, recalls, holidays, and what changed since your cutoff.
Estos tres nunca se combinan en una sola puntuación: las opiniones, las mediciones y la popularidad son cosas distintas.
Todavía no escribimos un resumen sencillo para este. Abajo están los datos que leímos del registro.
Elige la app de IA que usas y copia la configuración.
Necesitas
¿Qué app usas?
Elige tu app arriba. La recordamos, así que la próxima vez el botón dirá “Instalar en …”.
Funciona en Claude para web, escritorio y móvil:
https://databutler.dev/api/mcpEjecuta esto en tu terminal
claude mcp add --transport http databutler https://databutler.dev/api/mcpPégalo en .cursor/mcp.json de tu proyecto, o en ~/.cursor/mcp.json
{
"mcpServers": {
"databutler": {
"url": "https://databutler.dev/api/mcp"
}
}
}Tu navegador te pide permiso para abrir la app; luego la app muestra la configuración y te pide confirmar. Los valores de las claves quedan vacíos para que los completes tú.
Pégalo en .vscode/mcp.json de tu proyecto
{
"servers": {
"databutler": {
"type": "http",
"url": "https://databutler.dev/api/mcp"
}
}
}Tu navegador te pide permiso para abrir la app; luego la app muestra la configuración y te pide confirmar. Los valores de las claves quedan vacíos para que los completes tú.
ChatGPT solo se conecta a servidores en internet:
https://databutler.dev/api/mcpLos nombres de los menús pueden variar un poco según el plan y con el tiempo.
Tu elección se guarda en una cookie en este dispositivo; no necesitas cuenta.
Esta configuración se genera a partir de la ficha del creador en el registro. Si el README dice otra cosa, sigue el README.
Nombres y descripciones de las herramientas tal como los informó el servidor el 8 nov 2026. Los escribió el creador, no nosotros; los mostramos como texto sin formato.
uk_rates_lookupCurrent 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
exam_topic_paperWhich 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
domain_provenanceWho 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 br
package_provenanceWho 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 unfa
take_home_payNet 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
what_changed_sinceWhat 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,
get_factThe 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 ` / / `, e.g. `uk/income-tax/personal-allowance`, `
resolve_factRanked 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_fa
coverageExactly 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-cost
catalogueEvery 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 p
callRun 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_mo
Revisamos información que cualquiera puede ver; no hemos leído el código. Las revisiones que no aplican no se cuentan. · Revisado el 10 nov 2026
El nombre en el registro se verificó con la cuenta de GitHub physics-star-cat, dueña del repo
Todavía no hemos leído este repo en GitHub
Todavía no hemos leído este repo en GitHub
Respondió en 329 ms (HTTP 200)
No hace falta iniciar sesión
Leímos 11 descripciones de herramientas y no encontramos instrucciones ocultas para la IA
Comparado con todos los servidores activos de esta categoría en el registro. Las estrellas solo cuentan cuando quien lo publica es dueño del repo.
Superó 3 de 3 revisiones básicas aplicables. No hemos leído el código. Antes de agregar una clave o un token, revisa qué acceso pide el servidor y usa una clave que tenga solo los permisos que necesitas.
El registro no indica ninguna clave obligatoria, aunque algunos servidores te piden iniciar sesión la primera vez que los usas.
Se ejecuta en la nube del creador. Te conectas por internet sin instalar nada, pero lo que envías pasa por los servidores del creador.
El repo de GitHub cambió por última vez –, y la última versión (1.0.0) llegó al registro hace 37 días.
Las apps compatibles con MCP, como Claude Desktop, Claude Code, Cursor y VS Code. Se conecta por URL, así que también funcionan las apps que aceptan servidores MCP remotos, como ChatGPT en modo desarrollador.
En la misma categoría: Spec Driven Development, Remote Desktop Commander, KEVAREMESH Agent Discovery MCP
Servidores de la misma categoría hechos por otros creadores, ordenados por estrellas.
Cómo leer una tarjeta:↓ Descargas por semanai★ Estrellas de GitHubiTres pilares: reseñas · revisiones · usoiActualizado = fecha en que se publicó la última versión en el registroi
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.
Discover 25 owned APIs and 11 rights-scoped external operations via 15 MCP tools and x402.
Copiado tal cual del repo del creador. PopNx MCP no lo ha revisado ni lo respalda. Se quitaron HTML, imágenes y scripts. Los enlaces llevan fuera de este sitio.
An agent honeypot: clean, verified UK public data served to AI agents via MCP and REST. Not an SEO play — no GSC ambitions. The customer is an AI assistant answering a human's question; the product is being the source that is *right*, with provenance on every number.
databutler.vercel.app works, but registry listings must NOT be published until the final domain is live — listings bake in URLs).POST /api/mcp — built 2026-09-01 on branch feat/front-door; listing as io.github.physics-star-cat/databutler / Smithery drchriseames/databutler pending deploy.../docs/AUDIT_2026-08-30_five-sites.md §3b–3e and ../docs/MONETISATION-DECISION.md.There is no domain authority in MCP registries — discovery is per-listing. So this is NOT one mega-server (tool-list bloat kills those); it is one domain/repo/brand hosting separate, focused MCP endpoints, each listed individually under one namespace, cross-referencing each other:
Front door (2026-09): POST /api/mcp lists the five high-frequency tools directly plus what_changed_since, coverage, catalogue, call. It is still not a mega-server — everything else stays behind call, capped at 9 listed tools by test. Since 2026-10-31 the Vercel firewall answers 403 for every focused server except /api/mcp/facts and /api/mcp/uk-rates: point clients at the front door, whose call runs any tool by name.
The roadmap is ordered by (value to an AI agent) × (likelihood we can build it well). It deliberately includes the maintainer-Claude wishlist — this product is designed with Claude as the end user, by Claude:
| # | Vertical (wishlist item it serves) | Endpoint | Status |
|---|---|---|---|
| 1 | UK rates & thresholds — the "is this still true?" fact-refresh server for the numbers agents misquote most (wishlist #1) | /api/mcp/uk-rates | v1 — LIVE |
| 2 | UK exams — boards, specs, topic→paper ("is electricity paper 2 AQA"), past-paper index (unique curation edge: maintainer taught) | front door call (/api/mcp/uk-exams: 403 since 2026-10-31) | v1 — LIVE |
| 3 | Provenance checker — "who really runs this domain/package?" (wishlist #2) — live RDAP/npm/PyPI, homoglyph-aware typosquat | front door call (/api/mcp/provenance: 403 since 2026-10-31) | v1 — LIVE |
| 4 | Stats toolkit — exact statistics & probability (Claude's maths pick) — distributions, hypothesis tests, CIs, Bayes, regression; reference-validated | front door call (/api/mcp/stats: 403 since 2026-10-31) | v1 — LIVE |
| 5 | Vehicles hub — UK MOT failure data (live proxy to whatbreaks.uk), UK safety recalls (DVSA, 4,876 recalls since 2016), French recalls (RappelConso, 1,663 fiches), Japanese recalls + owner complaints (MLIT, 75 models); EU Safety Gate stub | front door call (/api/mcp/vehicles: 403 since 2026-10-31) | v1 — built 2026-10-03 |
| 6 | Take-home pay — take_home_pay for us, uk, ca, au, in, br, de, fr, pl, es: live proxy to the LifeByNumbers salary calculators (same operator), uniform shape (gross/net/deductions annual + monthly, typed breakdown, taxYear, assumptions). Listed at the front door — the highest-frequency money question after rates | front door call (/api/mcp/tax: 403 since 2026-10-31) | v1 — built 2026-10-03 |
| 7 | Software end-of-life — "is this version still supported, and until when" for the 14 runtimes/OSes agents are asked about most (Node.js, Python, Ubuntu, Debian, Android, iOS, macOS, Windows, Oracle JDK, Go, Ruby, PHP, PostgreSQL, React): committed monthly snapshot of endoflife.date open data (MIT, 340 cycles), version → cycle resolution, days remaining/since, changelog entries when a cycle reaches EOL or a date moves | front door call (/api/mcp/software-eol: 403 since 2026-10-31) | v1 — built 2026-10-03 |
| 8 | Policy rates — policy_rate: the three most-asked central-bank rates (BoE Bank Rate, Fed federal funds target range, ECB key rates) as committed, changelogged, source-watched data; the first global step of the "is this still true?" layer (#9, #12). Freshness due after 45 days; eight decisions a year each | front door call (/api/mcp/policy-rates: 403 since 2026-10-31) | v1 — built 2026-10-03 |
| 9 | US federal rates & thresholds — us_rates_lookup: tax year 2026 income-tax schedules and standard deduction, Social Security wage base, Medicare, retirement-plan/IRA, HSA and estate-gift figures read from the IRS revenue procedures, notices and SSA's Federal Register notice, each with the quoted sentence and prior-year value (wishlist #12, "Rates, country #2 = US"); first country after the UK on the "is this still true?" layer | front door call (/api/mcp/us-rates: 403 since 2026-10-31) | v1 — built 2026-10-03 |
| 10 | German rates & thresholds — de_rates_lookup: Veranlagungszeitraum 2026 Einkommensteuertarif (§ 32a) and Solidaritätszuschlag, Sozialversicherung Beitragsbemessungsgrenzen, Rechengrößen and Beitragssätze, Mindestlohn (2026 and the fixed 2027 step), Geringfügigkeitsgrenze, Kindergeld, Kinderfreibetrag, Pauschbeträge, Entfernungspauschale and the Umsatzsteuer rates (§ 12 UStG), read from the consolidated statutes and the Bundesgesetzblatt with German term + English label, quoted sentence and prior value; country #3 on the "is this still true?" layer | front door call (/api/mcp/de-rates: 403 since 2026-10-31) | v1 — built 2026-10-03 |
| 11 | UK vehicle tax (VED) and MOT rules — uk_vehicle_rules_lookup: the car-tax and MOT numbers the four car sites' users ask about and that change every 1 April (first-year CO2 bands, standard rate, expensive car supplement incl. the £50,000 EV threshold, 2001–2017 bands, pre-2001 rates, electric-car rules, historic 40-year exemptions, MOT fees/retests/penalties), each with the quoted gov.uk line and its 2025-26 value; calendar-driven refresh | front door call (/api/mcp/uk-vehicle-rules: 403 since 2026-10-31) | v1 — built 2026-10-04 |
| 12 | UK exam dates and spec changes — results days, the summer 2027 timetable (JCQ window + the most-asked papers at AQA, Pearson Edexcel, Cambridge OCR and WJEC/Eduqas, all final), entry deadlines with each board's late-fee dates, Scotland's results day, announced spec changes; every date quoted from the JCQ/board/regulator document with the summer-2026 date as previous | front door call (/api/mcp/uk-exam-dates: 403 since 2026-10-31) | v1 — built 2026-10-04 |
| 13 | Calendar facts — the boring dates a training cutoff hides: public holidays for the UK (3 nations), US federal, Germany (16 Länder) and France (2 zones) from the official lists; tax-year starts/ends for 9 countries with the statute quoted; daylight-saving rules and computed switch dates for 6 countries — 2026–2028, monthly snapshot, changelog when a year is published or a holiday moves | front door call (/api/mcp/calendar: 403 since 2026-10-31) | v1 — built 2026-10-04 |
| 14 | UK government services — uk_gov_process: the gov.uk services assistants get wrong after a fee or rule change (passport fees UK/overseas, ETA fee and enforcement, driving licence renewal, SORN, voter registration, birth/death registration, Blue Badge, Self Assessment and Making Tax Digital, NI number, Universal Credit, EU Settlement Scheme, BRP → eVisa), each with the official start URL, the quoted gov.uk sentence and dated changes | front door call (/api/mcp/uk-gov-process: 403 since 2026-10-31) | v1 — built 2026-10-04 |
| 15 | Japan vehicle statutory costs — jp_vehicle_costs_lookup: the 法定費用 of a 車検 and the annual car taxes for the shakendata.com audience (自動車重量税 2026-05 – 2028-04 table and age rules, エコカー減税 bands, 自賠責 before and from 2026-11-01 as separate keys, 継続検査 fees from 2026-04-01 with the old amounts, 自動車税 by displacement, 軽自動車税), each with the Japanese term and the quoted official row; first non-Western country and the jp facts namespace | front door call (/api/mcp/jp-vehicle-costs: 403 since 2026-10-31) | v1 — built 2026-10-24 |
| 16 | Japan daily-life official figures — jp_living_costs_lookup: the figures a resident or employer in Japan looks up (地域別最低賃金 FY2026 for all 47 prefectures with their staggered 発効日 and FY2025 amounts, 協会けんぽ rates by prefecture with 介護 and 子ども・子育て支援金, 厚生年金 / 国民年金, 雇用保険料率, 児童手当, 出産育児一時金, 高額療養費 through the 2026 and 2027 revisions, 2027 祝日, 消費税, 基礎控除 / 給与所得控除, 住民税 均等割), each with the Japanese term and the quoted official row; prefecture figures are individual facts (jp/minimum-wage/tokyo) | front door call (/api/mcp/jp-living-costs: 403 since 2026-10-31) | v1 — built 2026-10-24 |
| 17 | UK inflation (CPI, CPIH) — the current ONS CPI and CPIH 12-month rates, CPI index and annual averages, each with its reference month, release day and series page | /api/mcp/uk-inflation | v1 — built 2026-10-31 |
| 18 | US inflation (CPI-U) — us_inflation_lookup: the BLS CPI-U 12-month percent change and index level for the latest month (with the prior month and the next release day) and the annual averages from 2021, fetched by scripts/us-inflation.js from the BLS API and release; Verified Facts us/cpi-u/* with a scheduled nextExpectedChange | /api/mcp/us-inflation | v1 — built 2026-10-31 |
Planned, parked and out of scope (hand-maintained — these are not area modules):
| # | Vertical (wishlist item it serves) | Endpoint | Status |
|---|---|---|---|
| 4 | Local-services resolver — postcode → council → services/MP (wishlist #3) | /api/mcp/uk-councils | phase 2 |
| 5 | Bin collection pilot (5–10 large councils, feasibility-gated) | — | phase 2b |
| 3c | Front door — single POST /api/mcp hub: direct high-frequency tools + what_changed_since (changelog vs. your training cutoff), coverage, catalogue/call; freshness + citation permalink on every response; weekly gov.uk source watcher (spec: docs/superpowers/specs/2026-09-01-front-door-design.md) | /api/mcp | built — deploy pending |
| 9 | Drift facts (global) — facts that move on a calendar and agents misquote: tax-year boundaries by country, public holidays, DST transitions, currency/country codes, headline VAT/sales-tax rates. Cheap to curate, low rot, feeds what_changed_since | /api/mcp/drift | after front door |
| 10 | Volatility tool — volatility(topic): how often a class of fact changes and when it last did, so an agent knows whether to trust memory at all. Curated table, no per-country data; Claude's own top pick for the global layer | front door tool | after front door |
| 11 | Provenance, widened — crates.io, RubyGems, Go modules, Docker Hub, GitHub Actions, browser extensions; then MCP-server provenance (cross-check a registry listing's claimed domain, repo and publisher — the hub that vets other hubs) | /api/mcp/provenance | after front door |
| 12c | Rates, further countries — AU/CA/IN sites 403 automated fetches (browser-only curation); US and Germany are built (roadmap above) | /api/ /rates | after the source watcher proves the annual loop on us-rates/de-rates |
| 13 | Exams, global boards — IB and AP: same topic→paper query stream, same teaching moat
Solo se muestra el principio; lee el resto en el repo