{"$schema":"https://verifymcp.io/schemas/trust-report.json","schemaVersion":1,"license":{"name":"CC BY-NC 4.0","url":"https://creativecommons.org/licenses/by-nc/4.0/"},"generatedAt":"2026-11-05T17:24:44.866Z","url":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts","markdownUrl":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts.md","server":{"slug":"physics-star-cat-databutler-facts","name":"io.github.physics-star-cat/databutler-facts","registryName":"io.github.physics-star-cat/databutler-facts","description":"Official thresholds, rates and fees by key, with source, verified date and signature.","registryStatus":"active","deletedAt":null,"statusMessage":null,"liveness":"live","publisher":{"class":"unknown","claimed":false}},"component":{"slug":"api-mcp-facts","type":"remote","identifier":"https://databutler.dev/api/mcp/facts","withdrawn":false,"url":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts","version":"1.0.0","transport":null,"scoredAt":"2026-11-05T04:24:33.444Z"},"score":{"total":81,"tier":"high trust","status":"scored","weekDelta":3,"history":[{"date":"2026-11-05","total":81},{"date":"2026-11-04","total":80},{"date":"2026-11-03","total":80},{"date":"2026-11-02","total":80},{"date":"2026-11-01","total":79},{"date":"2026-10-31","total":79},{"date":"2026-10-30","total":78},{"date":"2026-10-29","total":78},{"date":"2026-10-28","total":77},{"date":"2026-10-27","total":77},{"date":"2026-10-26","total":76},{"date":"2026-10-25","total":76},{"date":"2026-10-24","total":76},{"date":"2026-10-23","total":75},{"date":"2026-10-22","total":75},{"date":"2026-10-21","total":74},{"date":"2026-10-20","total":74},{"date":"2026-10-19","total":73},{"date":"2026-10-18","total":73},{"date":"2026-10-17","total":72},{"date":"2026-10-16","total":72},{"date":"2026-10-15","total":71},{"date":"2026-10-14","total":71},{"date":"2026-10-13","total":70}]},"categories":[{"name":"Endpoint Security","score":80,"verdict":"fail","reasons":["The endpoint's TLS certificate is valid, in date, and uses a strong key.","No authorisation is required to call this server. Nothing on it is marked destructive, but we can't show that an anonymous caller can only read: full credit needs the server to list at least one tool and every tool to be verifiably read-only. We use a best-effort check of tool names and descriptions to tell read-only tools from tools that change things, so some genuinely read-only tools may not get full credit. Names that start with a read verb (get, list, read, search and similar) and accurate readOnlyHint annotations help. Meet that to earn full credit, or require authorisation.","HTTPS is enforced; there's no plaintext access path.","The HSTS (Strict-Transport-Security) header is present.","DNSSEC check failed: this domain isn't protected by DNSSEC."],"codes":[{"code":"tls.valid","args":{}},{"code":"auth.none_no_destructive","args":{}},{"code":"https.enforced","args":{}},{"code":"headers.hsts_present","args":{}},{"code":"dnssec.absent","args":{}}]},{"name":"Transport & Reachability","score":100,"verdict":"pass","reasons":["Verified streamable-http transport via a live MCP handshake."],"codes":[{"code":"transport.verified","args":{"transport":"streamable-http"}}]},{"name":"Schema Quality & AI Usability","score":57,"verdict":"fail","reasons":["AI-judged instruction clarity (good).","Context-footprint check failed: tool/resource definitions use about 1290 tokens (~430/item across 3 items; 3 tools + 0 resources), over budget; trim descriptions and params.","Usage-examples check failed: none of the tools include examples."],"codes":[{"code":"schema.ai_quality","args":{"band":"good"}},{"code":"schema.footprint_heavy","args":{"avg":"430","items":"3","tools":"3","tokens":"1290","resources":"0"}},{"code":"schema.examples_absent","args":{}}]},{"name":"Stability & Change Management","score":77,"verdict":"partial","reasons":["Stability observed for 23 of 30 days with no destabilising changes; credit accrues until the full window elapses."],"codes":[{"code":"stability.building_history","args":{"days":"23"}}]},{"name":"Tool Coverage","score":100,"verdict":"pass","reasons":["100% of tools have a non-trivial description (not blank, and not just the tool's name).","100% of tool parameters carry a description."],"codes":[{"code":"toolquality.descriptions","args":{"pct":"100"}},{"code":"toolquality.param_docs","args":{"pct":"100"}}]},{"name":"Tool Safety","score":100,"verdict":"pass","reasons":["No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.","We read all 3 captured tool definition(s), and no name or description among them implies an irreversible operation.","An AI judge read all 4 captured unit(s) of tool text and found none that tries to manipulate the model reading it."],"codes":[{"code":"toolsafety.injection_clean","args":{}},{"code":"toolsafety.destructive_none","args":{"tools":"3"}},{"code":"toolsafety.manipulation_clean","args":{"units":"4","judged":"4"}}]},{"name":"Capabilities","score":100,"verdict":"pass","reasons":["Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28."],"codes":[{"code":"protocol.supported","args":{"latest":"2026-07-28","version":"2025-11-25"}}]}],"inconclusive":[],"malware":[],"components":[{"slug":"api-mcp-facts","type":"remote","identifier":"https://databutler.dev/api/mcp/facts","withdrawn":false,"score":81,"current":true,"url":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts","markdownUrl":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts.md"}],"facts":[{"label":"Endpoint","value":"https://databutler.dev/api/mcp/facts"},{"label":"Transports","value":"streamable-http"},{"label":"Auth","value":"none"},{"label":"Version","value":"1.0.0"}],"install":{"available":true,"bundleSha256":null},"tools":[{"name":"get_fact","title":"Get a verified fact","description":"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.","inputs":[{"name":"as_of","type":"string","required":false,"description":"optional YYYY-MM-DD: the value in force that day"},{"name":"key","type":"string","required":true,"description":"one key, or several separated by commas (max 50), e.g. uk/income-tax/personal-allowance"},{"name":"max_age","type":"string","required":false,"description":"optional freshness bar: 30d, 12w, 6m, 1y or ISO 8601 (P30D)"},{"name":"period","type":"string","required":false,"description":"optional period label instead of as_of, e.g. 2025-26"}],"outputs":[],"hasOutputSchema":false,"hasExamples":false,"tokenEstimate":380},{"name":"resolve_fact","title":"Find the key for a fact","description":"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`).","inputs":[{"name":"limit","type":"integer","required":false,"description":"default 5"},{"name":"namespace","type":"string","required":false,"description":"optional jurisdiction filter"},{"name":"q","type":"string","required":true,"description":"question or guessed key"}],"outputs":[],"hasOutputSchema":false,"hasExamples":false,"tokenEstimate":120},{"name":"what_changed_since","title":"What changed since","description":"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.…","inputs":[{"name":"area","type":"string","required":false,"description":"default all"},{"name":"since","type":"string","required":true,"description":"ISO date YYYY-MM-DD, e.g. your training cutoff"}],"outputs":[],"hasOutputSchema":false,"hasExamples":false,"tokenEstimate":573}],"toolsTruncatedAtCapture":false,"diagnostics":{"capturedAt":"2026-11-05T04:24:33.000Z","track":"remote","endpoint":"https://databutler.dev/api/mcp/facts","declaredUrl":null,"truncated":false,"tls":{"outcome":"valid","label":"Valid","version":"TLS 1.3","cipherSuite":"TLS_AES_128_GCM_SHA256","chainError":null,"certificates":[{"subject":"CN=databutler.dev","issuer":"CN=YR2,O=Let's Encrypt,C=US","notBefore":"2026-11-01T10:37:15Z","notAfter":"2027-01-30T10:37:14Z","keyType":"RSA","keyBits":2048,"isCa":false},{"subject":"CN=YR2,O=Let's Encrypt,C=US","issuer":"CN=Root YR,O=ISRG,C=US","notBefore":"2025-09-03T00:00:00Z","notAfter":"2028-09-02T23:59:59Z","keyType":"RSA","keyBits":2048,"isCa":true},{"subject":"CN=Root YR,O=ISRG,C=US","issuer":"CN=ISRG Root X1,O=Internet Security Research Group,C=US","notBefore":"2026-05-13T00:00:00Z","notAfter":"2032-09-02T23:59:59Z","keyType":"RSA","keyBits":4096,"isCa":true}]},"dnssec":{"result":"insecure","label":"Not signed","name":"databutler.dev.","steps":[{"zone":".","outcome":"verified","label":"Verified"},{"zone":"dev.","outcome":"verified","label":"Verified"},{"zone":"databutler.dev.","outcome":"insecure_proven","label":"Unsigned (proven)"}]},"auth":{"outcome":"none","label":"No authorisation required","gate":null,"gateLabel":null,"status":200,"authorizationServers":[]},"httpsRedirect":{"outcome":"https_enforced","label":"HTTPS enforced","status":308},"transports":[{"transport":"streamable-http","outcome":"verified","label":"Verified","status":200,"followed":false}],"provenance":null,"installScripts":[],"installScriptsTotal":null,"vulnerabilities":[],"vulnerabilitiesTotal":null,"dependencies":null},"mismatches":[],"changelog":{"trackingSince":"2026-10-13","recent":[{"id":"chg_01a1a9f3-8db9-7d44-911f-fa566d0a9b44","kind":"score.total_changed","summary":"Trust score (80 → 81)","materiality":"functional","direction":"improvement","scoreDelta":1,"occurredOn":"2026-11-05","url":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts#chg-chg_01a1a9f3-8db9-7d44-911f-fa566d0a9b44"},{"id":"chg_01a19a70-da99-7728-a5eb-6a42d7b97356","kind":"score.total_changed","summary":"Trust score (79 → 80)","materiality":"functional","direction":"improvement","scoreDelta":1,"occurredOn":"2026-11-02","url":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts#chg-chg_01a19a70-da99-7728-a5eb-6a42d7b97356"},{"id":"chg_01a1954a-cb9c-79aa-9a54-703c39b78dba","kind":"tool.description_changed","summary":"Tool “get_fact” rewrote its description, which is the text the model reads","materiality":"security","direction":"neutral","scoreDelta":null,"occurredOn":"2026-11-01","url":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts#chg-chg_01a1954a-cb9c-79aa-9a54-703c39b78dba"},{"id":"chg_01a1954a-cb9d-7c7c-886a-1081e5262d02","kind":"tool.description_changed","summary":"Tool “what_changed_since” rewrote its description, which is the text the model 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79)","materiality":"functional","direction":"improvement","scoreDelta":1,"occurredOn":"2026-10-31","url":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts#chg-chg_01a19022-f4c4-7d16-9e64-8abd0130563b"},{"id":"chg_01a185d5-53be-740a-85fa-5e34592c383e","kind":"score.total_changed","summary":"Trust score (77 → 78)","materiality":"functional","direction":"improvement","scoreDelta":1,"occurredOn":"2026-10-29","url":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts#chg-chg_01a185d5-53be-740a-85fa-5e34592c383e"},{"id":"chg_01a17b88-971d-756a-b640-12dbc312a35f","kind":"score.total_changed","summary":"Trust score (76 → 77)","materiality":"functional","direction":"improvement","scoreDelta":1,"occurredOn":"2026-10-27","url":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts#chg-chg_01a17b88-971d-756a-b640-12dbc312a35f"},{"id":"chg_01a1713b-e208-7726-81d4-451f8df161fa","kind":"tool.description_changed","summary":"Tool “what_changed_since” rewrote its description, which is the text the model reads","materiality":"security","direction":"neutral","scoreDelta":null,"occurredOn":"2026-10-25","url":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts#chg-chg_01a1713b-e208-7726-81d4-451f8df161fa"},{"id":"chg_01a16c16-05c7-75ca-bd20-43b3431f3eb6","kind":"score.total_changed","summary":"Trust score (75 → 76)","materiality":"functional","direction":"improvement","scoreDelta":1,"occurredOn":"2026-10-24","url":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts#chg-chg_01a16c16-05c7-75ca-bd20-43b3431f3eb6"},{"id":"chg_01a161c6-d52f-7d6b-956e-5dd70756868c","kind":"score.total_changed","summary":"Trust score (74 → 75)","materiality":"functional","direction":"improvement","scoreDelta":1,"occurredOn":"2026-10-22","url":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts#chg-chg_01a161c6-d52f-7d6b-956e-5dd70756868c"},{"id":"chg_01a1577a-4ef4-71c8-89c9-de76b458a71b","kind":"score.total_changed","summary":"Trust score (73 → 74)","materiality":"functional","direction":"improvement","scoreDelta":1,"occurredOn":"2026-10-20","url":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts#chg-chg_01a1577a-4ef4-71c8-89c9-de76b458a71b"},{"id":"chg_01a14d2d-bbb6-7d60-8b36-398d6f5216e8","kind":"score.total_changed","summary":"Trust score (72 → 73)","materiality":"functional","direction":"improvement","scoreDelta":1,"occurredOn":"2026-10-18","url":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts#chg-chg_01a14d2d-bbb6-7d60-8b36-398d6f5216e8"},{"id":"chg_01a142e1-b321-7ad7-b762-9dce8b6bf6e6","kind":"server.instructions_changed","summary":"The server rewrote its instructions, which are the text every model session reads","materiality":"security","direction":"neutral","scoreDelta":null,"occurredOn":"2026-10-16","url":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts#chg-chg_01a142e1-b321-7ad7-b762-9dce8b6bf6e6"},{"id":"chg_01a142e1-b3e2-79dc-b409-95bfe606ef53","kind":"score.total_changed","summary":"Trust score (71 → 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71)","materiality":"functional","direction":"improvement","scoreDelta":1,"occurredOn":"2026-10-14","url":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts#chg-chg_01a13894-ab6b-7659-8801-ca4edd96b2fd"},{"id":"chg_01a134b6-5726-7b77-ba16-17db74c64ef8","kind":"score.first_scored","summary":"First indexed and scored","materiality":"functional","direction":"neutral","scoreDelta":null,"occurredOn":"2026-10-13","url":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts#chg-chg_01a134b6-5726-7b77-ba16-17db74c64ef8"}],"truncated":false,"feedUrl":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts/changelog.json"},"links":{"html":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts","markdown":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts.md","changelogJson":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts/changelog.json","changelogRss":"https://verifymcp.io/servers/physics-star-cat-databutler-facts/api-mcp-facts.xml","external":[{"label":"Remote endpoint","href":"https://databutler.dev/api/mcp/facts"},{"label":"Repository","href":"https://github.com/physics-star-cat/databutler"},{"label":"Website","href":"https://databutler.dev/api"}]}}