{"$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":"2026-11-06T16:32:29.663Z","url":"https://verifymcp.io/servers/com-tallyfern-rates/mcp","markdownUrl":"https://verifymcp.io/servers/com-tallyfern-rates/mcp.md","server":{"slug":"com-tallyfern-rates","name":"Tallyfern Rates (Canada)","registryName":"com.tallyfern/rates","description":"Read-only Canadian GST/HST rates, small-supplier check and CRA allowance rates, with CRA sources.","registryStatus":"active","deletedAt":null,"statusMessage":null,"liveness":"live","publisher":{"class":"unknown","claimed":false}},"component":{"slug":"mcp","type":"remote","identifier":"https://mcp.tallyfern.com/mcp","withdrawn":false,"url":"https://verifymcp.io/servers/com-tallyfern-rates/mcp","version":"0.3.4","transport":null,"scoredAt":"2026-11-06T01:20:12.980Z"},"score":{"total":83,"tier":"high trust","status":"scored","weekDelta":1,"history":[{"date":"2026-11-06","total":83},{"date":"2026-11-05","total":83},{"date":"2026-11-04","total":83},{"date":"2026-11-03","total":83},{"date":"2026-11-02","total":83},{"date":"2026-11-01","total":83},{"date":"2026-10-31","total":82},{"date":"2026-10-30","total":82},{"date":"2026-10-29","total":81},{"date":"2026-10-28","total":81},{"date":"2026-10-27","total":80},{"date":"2026-10-26","total":80},{"date":"2026-10-25","total":79},{"date":"2026-10-24","total":79},{"date":"2026-10-23","total":78},{"date":"2026-10-22","total":78},{"date":"2026-10-21","total":78},{"date":"2026-10-20","total":78},{"date":"2026-10-19","total":77},{"date":"2026-10-18","total":77},{"date":"2026-10-17","total":76},{"date":"2026-10-16","total":76},{"date":"2026-10-15","total":75},{"date":"2026-10-14","total":75},{"date":"2026-10-13","total":74},{"date":"2026-10-12","total":74},{"date":"2026-10-11","total":73},{"date":"2026-10-10","total":73},{"date":"2026-10-08","total":72},{"date":"2026-10-05","total":71}]},"categories":[{"name":"Endpoint Security","score":69,"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 enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement.","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.inconclusive","args":{"reason":"plaintext_status","status":"405"}},{"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":74,"verdict":"fail","reasons":["AI-judged instruction clarity (excellent).","Context-footprint check failed: tool/resource definitions use about 771 tokens (~154/item across 5 items; 5 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":"excellent"}},{"code":"schema.footprint_heavy","args":{"avg":"154","items":"5","tools":"5","tokens":"771","resources":"0"}},{"code":"schema.examples_absent","args":{}}]},{"name":"Stability & Change Management","score":100,"verdict":"pass","reasons":["No destabilizing schema changes in the last 30 days."],"codes":[{"code":"stability.stable","args":{}}]},{"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.","Structured output schemas are declared (100% of tools); any adoption earns full credit."],"codes":[{"code":"toolquality.descriptions","args":{"pct":"100"}},{"code":"toolquality.param_docs","args":{"pct":"100"}},{"code":"toolquality.output_present","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 5 captured tool definition(s), and no name or description among them implies an irreversible operation.","An AI judge read all 6 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":"5"}},{"code":"toolsafety.manipulation_clean","args":{"units":"6","judged":"6"}}]},{"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":["HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement."],"malware":[],"components":[{"slug":"mcp","type":"remote","identifier":"https://mcp.tallyfern.com/mcp","withdrawn":false,"score":83,"current":true,"url":"https://verifymcp.io/servers/com-tallyfern-rates/mcp","markdownUrl":"https://verifymcp.io/servers/com-tallyfern-rates/mcp.md"}],"facts":[{"label":"Endpoint","value":"https://mcp.tallyfern.com/mcp"},{"label":"Transports","value":"streamable-http"},{"label":"Auth","value":"none"},{"label":"Version","value":"0.3.4"}],"install":{"available":true,"bundleSha256":null},"tools":[{"name":"gst_hst_small_supplier_check","title":"GST/HST small supplier ($30,000) check","description":"Apply the CRA's $30,000 small-supplier tests (single calendar quarter and four consecutive calendar quarters) to taxable revenue by calendar quarter. Says whether the person must register for the GST/HST, when they stop being a small supplier, the effective date of registration, and headroom for next quarter. Most businesses only (not charities/public service bodies). Returns structuredContent with status, headline, the triggering quarter (or null), per-quarter rolling totals, next-quarter headroom, sources and an as-of date.","inputs":[{"name":"quarters","type":"array","required":true,"description":"Consecutive calendar quarters, no gaps (use 0 for quarters with no sales)."},{"name":"taxiOrRideshare","type":"boolean","required":false,"description":"True if self-employed taxi or commercial ride-sharing driver (must register regardless)."}],"outputs":[{"name":"asOf","type":"string","required":true,"description":"Date the rules were last verified"},{"name":"currency","type":"string","required":true,"description":"Currency of all amounts: Canadian dollars"},{"name":"dataVersion","type":"string","required":true,"description":"Version of the Tallyfern Rates dataset, e.g. 2026.10.03"},{"name":"disclaimer","type":"string","required":true,"description":"Not-tax-advice notice"},{"name":"explanation","type":"array","required":true,"description":"Short plain-language points explaining the result"},{"name":"headline","type":"string","required":true,"description":"One-sentence answer"},{"name":"latest","type":"object","required":true,"description":"Summary for the most recent quarter given"},{"name":"nextQuarter","type":"object","required":true,"description":"The quarter after the latest one given, with remaining headroom"},{"name":"quarters","type":"array","required":true,"description":"Each quarter checked, oldest first"},{"name":"relatedLink","type":"string","required":true,"description":"Related free Tallyfern tool or page"},{"name":"rule","type":"string","required":true,"description":"Identifier of the rule set applied (ca-gst-hst-small-supplier)"},{"name":"ruleVersion","type":"string","required":true,"description":"Version of that rule set, e.g. 1.0.0"},{"name":"sources","type":"array","required":true,"description":"Official canada.ca pages used for this answer"},{"name":"status","type":"string","required":true,"description":"Result of the small-supplier tests"},{"name":"threshold","type":"number","required":true,"description":"Small-supplier threshold (30000)"},{"name":"trigger","type":null,"required":true,"description":"The first quarter that triggered registration, or null"}],"hasOutputSchema":true,"hasExamples":false,"tokenEstimate":165},{"name":"gst_hst_rate_by_province","title":"GST/HST and PST rates by province","description":"Current GST/HST rate for a Canadian province or territory (or all 13), with the PST/QST rate CRA lists for reference. From CRA's 'Charge and collect the GST/HST' table. Returns structuredContent with one rate row (or all 13), the effective-from date, notes, the canada.ca source and an as-of date.","inputs":[{"name":"province","type":"string","required":false,"description":"Province or territory code or name, e.g. \"ON\", \"Ontario\", \"QC\", \"Yukon\"."}],"outputs":[{"name":"asOf","type":"string","required":true,"description":"Date (YYYY-MM-DD) the figures were last checked against the source pages"},{"name":"dataVersion","type":"string","required":true,"description":"Version of the Tallyfern Rates dataset, e.g. 2026.10.03"},{"name":"disclaimer","type":"string","required":true,"description":"Not-tax-advice notice"},{"name":"effectiveFrom","type":"string","required":true,"description":"Rates effective on or after this date"},{"name":"notes","type":"array","required":true,"description":"Caveats: place of supply, zero-rated/exempt supplies, PST shown for reference"},{"name":"rate","type":"object","required":false,"description":"The requested province or territory (when one was given)"},{"name":"rates","type":"array","required":false,"description":"All 13 provinces and territories (when no province was given)"},{"name":"relatedLink","type":"string","required":true,"description":"Related free Tallyfern tool or page"},{"name":"source","type":"object","required":true,"description":"Official source for these figures"}],"hasOutputSchema":true,"hasExamples":false,"tokenEstimate":115},{"name":"cra_automobile_allowance_rate","title":"CRA per-km automobile allowance rate","description":"CRA reasonable per-kilometre allowance rates for employer-paid vehicle allowances (2026 default; 2025 also available): first 5,000 km and after, provinces vs territories. Optionally calculates the allowance for a number of business kilometres. Returns structuredContent with the per-km rates for provinces and territories, the rates for the given region, an optional tiered calculation, the source and an as-of date.","inputs":[{"name":"kilometres","type":"number","required":false,"description":"Business kilometres in the calendar year, to calculate an allowance."},{"name":"province","type":"string","required":false,"description":"Province or territory code or name, e.g. \"ON\", \"Ontario\", \"QC\", \"Yukon\"."},{"name":"year","type":"number","required":false,"description":"Calendar year (2026 or 2025). Default 2026."}],"outputs":[{"name":"applicable","type":"object","required":false,"description":"Rates that apply to the given province or territory"},{"name":"asOf","type":"string","required":true,"description":"Date (YYYY-MM-DD) the figures were last checked against the source pages"},{"name":"calculation","type":"object","required":false,"description":"Allowance for the given kilometres"},{"name":"currency","type":"string","required":true,"description":"Currency of all amounts: Canadian dollars"},{"name":"dataVersion","type":"string","required":true,"description":"Version of the Tallyfern Rates dataset, e.g. 2026.10.03"},{"name":"disclaimer","type":"string","required":true,"description":"Not-tax-advice notice"},{"name":"rates","type":"object","required":true,"description":"CRA per-km allowance rates for that year"},{"name":"region","type":"object","required":false,"description":"The province or territory given, if any"},{"name":"relatedLink","type":"string","required":true,"description":"Related free Tallyfern tool or page"},{"name":"scope","type":"string","required":true,"description":"Who these rates are for (employer allowances to employees) and who they are not for"},{"name":"source","type":"object","required":true,"description":"Official source for these figures"},{"name":"territoryExtraPerKm","type":"number","required":true,"description":"Extra $ per km for the territories over the provincial rate"},{"name":"year","type":"integer","required":true,"description":"Year the per-km rates apply to (2026 or 2025)"}],"hasOutputSchema":true,"hasExamples":false,"tokenEstimate":167},{"name":"cra_meal_travel_allowance","title":"CRA simplified meal and vehicle rates","description":"CRA simplified-method rates (latest published tax year): flat meal rate per meal and maximum per day, and vehicle cents/km by province or territory where travel begins. These apply to moving expenses, northern residents deductions and medical travel, not to employer per-diems. Optionally calculates amounts. Returns structuredContent with the tax year, meal rates, vehicle cents/km (one province or all), optional vehicle and meal amounts, scope notes, the source and an as-of date.","inputs":[{"name":"days","type":"integer","required":false,"description":"Number of days (caps meals at the daily maximum)."},{"name":"kilometres","type":"number","required":false,"description":"Kilometres driven, to calculate a vehicle amount (needs province)."},{"name":"meals","type":"integer","required":false,"description":"Number of meals."},{"name":"province","type":"string","required":false,"description":"Province or territory where the travel begins."}],"outputs":[{"name":"asOf","type":"string","required":true,"description":"Date (YYYY-MM-DD) the figures were last checked against the source pages"},{"name":"dataVersion","type":"string","required":true,"description":"Version of the Tallyfern Rates dataset, e.g. 2026.10.03"},{"name":"disclaimer","type":"string","required":true,"description":"Not-tax-advice notice"},{"name":"latestPublishedNote","type":"string","required":true,"description":"Which tax year the CRA page showed as of the check date"},{"name":"mealAmount","type":"object","required":false,"description":"Meal amount (when meals or days were given)"},{"name":"meals","type":"object","required":true,"description":"Simplified-method meal rates"},{"name":"region","type":"object","required":false,"description":"Province or territory where travel begins, if given"},{"name":"relatedLink","type":"string","required":true,"description":"Related free Tallyfern tool or page"},{"name":"scope","type":"string","required":true,"description":"What these rates apply to (moving expenses, northern residents deductions, medical travel) and what they don't"},{"name":"source","type":"object","required":true,"description":"Official source for these figures"},{"name":"taxYear","type":"integer","required":true,"description":"Tax year of the simplified rates returned (latest published on the CRA page)"},{"name":"vehicleAmount","type":"number","required":false,"description":"Kilometres × cents per km, converted to CAD dollars (when kilometres and province were given)"},{"name":"vehicleCentsPerKm","type":"number","required":false,"description":"Cents per km for the province where travel begins"},{"name":"vehicleCentsPerKmByProvince","type":"object","required":false,"description":"Cents per km by province code (when no province was given)"}],"hasOutputSchema":true,"hasExamples":false,"tokenEstimate":168},{"name":"ontario_hst_basics","title":"Ontario HST basics","description":"Plain-language basics for Ontario businesses: the 13% HST rate, the $30,000 small-supplier threshold, the 29-day registration deadline and place-of-supply rule, with CRA sources. Returns structuredContent with the Ontario rate row, the threshold, the registration deadline in days, sources and an as-of date.","inputs":[],"outputs":[{"name":"asOf","type":"string","required":true,"description":"Date (YYYY-MM-DD) the figures were last checked against the source pages"},{"name":"dataVersion","type":"string","required":true,"description":"Version of the Tallyfern Rates dataset, e.g. 2026.10.03"},{"name":"disclaimer","type":"string","required":true,"description":"Not-tax-advice notice"},{"name":"province","type":"string","required":true,"description":"Always ON (Ontario)"},{"name":"rate","type":"object","required":true,"description":"Ontario's HST rate row from CRA's table"},{"name":"registerWithinDays","type":"integer","required":true,"description":"Days to register after the effective date of registration (29)"},{"name":"relatedLink","type":"string","required":true,"description":"Related free Tallyfern tool or page"},{"name":"smallSupplierThreshold","type":"number","required":true,"description":"Small-supplier threshold (30000)"},{"name":"sources","type":"array","required":true,"description":"Official canada.ca pages used for this answer"}],"hasOutputSchema":true,"hasExamples":false,"tokenEstimate":79}],"toolsTruncatedAtCapture":false,"diagnostics":{"capturedAt":"2026-11-06T01:20:12.000Z","track":"remote","endpoint":"https://mcp.tallyfern.com/mcp","declaredUrl":null,"truncated":false,"tls":{"outcome":"valid","label":"Valid","version":"TLS 1.3","cipherSuite":"TLS_AES_128_GCM_SHA256","chainError":null,"certificates":[{"subject":"CN=tallyfern.com","issuer":"CN=WE1,O=Google Trust Services,C=US","notBefore":"2026-10-03T14:31:51Z","notAfter":"2027-01-01T15:31:33Z","keyType":"ECDSA","keyBits":256,"isCa":false},{"subject":"CN=WE1,O=Google Trust Services,C=US","issuer":"CN=GTS Root R4,O=Google Trust Services LLC,C=US","notBefore":"2023-12-13T09:00:00Z","notAfter":"2029-02-20T14:00:00Z","keyType":"ECDSA","keyBits":256,"isCa":true},{"subject":"CN=GTS Root R4,O=Google Trust Services LLC,C=US","issuer":"CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE","notBefore":"2023-11-15T03:43:21Z","notAfter":"2028-01-28T00:00:42Z","keyType":"ECDSA","keyBits":384,"isCa":true}]},"dnssec":{"result":"insecure","label":"Not signed","name":"mcp.tallyfern.com.","steps":[{"zone":".","outcome":"verified","label":"Verified"},{"zone":"com.","outcome":"verified","label":"Verified"},{"zone":"tallyfern.com.","outcome":"insecure_proven","label":"Unsigned (proven)"}]},"auth":{"outcome":"none","label":"No authorisation required","gate":null,"gateLabel":null,"status":200,"authorizationServers":[]},"httpsRedirect":{"outcome":"inconclusive","label":"Inconclusive","status":405},"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":"2026-10-03","recent":[{"id":"chg_01a1ae71-24ce-7235-9253-7d3e325c76cc","kind":"score.rubric_changed","summary":"We updated how we score, so this day's move reflects our rubric, not a change to the server","materiality":"functional","direction":"neutral","scoreDelta":null,"occurredOn":"2026-11-06","url":"https://verifymcp.io/servers/com-tallyfern-rates/mcp#chg-chg_01a1ae71-24ce-7235-9253-7d3e325c76cc"},{"id":"chg_01a199d8-81dc-75bc-af61-9b302c19e568","kind":"check.verdict","summary":"Stability (0.97 → pass)","materiality":"security","direction":"neutral","scoreDelta":null,"occurredOn":"2026-11-02","url":"https://verifymcp.io/servers/com-tallyfern-rates/mcp#chg-chg_01a199d8-81dc-75bc-af61-9b302c19e568"},{"id":"chg_01a194b2-49e6-7c9f-a667-e9db2094ccba","kind":"score.total_changed","summary":"Trust score (82 → 83)","materiality":"functional","direction":"improvement","scoreDelta":1,"occurredOn":"2026-11-01","url":"https://verifymcp.io/servers/com-tallyfern-rates/mcp#chg-chg_01a194b2-49e6-7c9f-a667-e9db2094ccba"},{"id":"chg_01a18a65-f55a-75ca-92c6-34e7a1ec3969","kind":"score.total_changed","summary":"Trust score (81 → 82)","materiality":"functional","direction":"improvement","scoreDelta":1,"occurredOn":"2026-10-30","url":"https://verifymcp.io/servers/com-tallyfern-rates/mcp#chg-chg_01a18a65-f55a-75ca-92c6-34e7a1ec3969"},{"id":"chg_01a18089-49de-7509-830e-21b4ea04dbe6","kind":"server.version_changed","summary":"Server version (0.3.2 → 0.3.3)","materiality":"functional","direction":"neutral","scoreDelta":null,"occurredOn":"2026-10-28","url":"https://verifymcp.io/servers/com-tallyfern-rates/mcp#chg-chg_01a18089-49de-7509-830e-21b4ea04dbe6"},{"id":"chg_01a18019-af02-7703-8ace-ca3128fd905a","kind":"score.total_changed","summary":"Trust score (80 → 81)","materiality":"functional","direction":"improvement","scoreDelta":1,"occurredOn":"2026-10-28","url":"https://verifymcp.io/servers/com-tallyfern-rates/mcp#chg-chg_01a18019-af02-7703-8ace-ca3128fd905a"},{"id":"chg_01a175cc-5b7c-710c-88ee-ef0a54842eea","kind":"score.total_changed","summary":"Trust score (79 → 80)","materiality":"functional","direction":"improvement","scoreDelta":1,"occurredOn":"2026-10-26","url":"https://verifymcp.io/servers/com-tallyfern-rates/mcp#chg-chg_01a175cc-5b7c-710c-88ee-ef0a54842eea"},{"id":"chg_01a16b7f-24ad-7e12-aac0-d74a2ecf0000","kind":"score.total_changed","summary":"Trust score (78 → 79)","materiality":"functional","direction":"improvement","scoreDelta":1,"occurredOn":"2026-10-24","url":"https://verifymcp.io/servers/com-tallyfern-rates/mcp#chg-chg_01a16b7f-24ad-7e12-aac0-d74a2ecf0000"},{"id":"chg_01a168d9-b675-703a-8da6-6154a8cd4bd2","kind":"check.measure","summary":"Schema quality (122 → 154)","materiality":"functional","direction":"regression","scoreDelta":null,"occurredOn":"2026-10-23","url":"https://verifymcp.io/servers/com-tallyfern-rates/mcp#chg-chg_01a168d9-b675-703a-8da6-6154a8cd4bd2"},{"id":"chg_01a168d9-b676-7905-9f54-fe8ceb784e34","kind":"tool.description_changed","summary":"Tool “cra_automobile_allowance_rate” rewrote its description, which is the text the model reads","materiality":"security","direction":"neutral","scoreDelta":null,"occurredOn":"2026-10-23","url":"https://verifymcp.io/servers/com-tallyfern-rates/mcp#chg-chg_01a168d9-b676-7905-9f54-fe8ceb784e34"},{"id":"chg_01a168d9-b679-71f3-ac70-f6f3e1c5cd09","kind":"tool.description_changed","summary":"Tool “cra_meal_travel_allowance” rewrote its description, which is the text the model reads","materiality":"security","direction":"neutral","scoreDelta":null,"occurredOn":"2026-10-23","url":"https://verifymcp.io/servers/com-tallyfern-rates/mcp#chg-chg_01a168d9-b679-71f3-ac70-f6f3e1c5cd09"},{"id":"chg_01a168d9-b67a-7771-804e-347d90a6a4b8","kind":"tool.description_changed","summary":"Tool “gst_hst_rate_by_province” rewrote its description, which is the text the model reads","materiality":"security","direction":"neutral","scoreDelta":null,"occurredOn":"2026-10-23","url":"https://verifymcp.io/servers/com-tallyfern-rates/mcp#chg-chg_01a168d9-b67a-7771-804e-347d90a6a4b8"},{"id":"chg_01a168d9-b67b-729f-99b3-cd16e41583d1","kind":"tool.description_changed","summary":"Tool “gst_hst_small_supplier_check” rewrote its description, which is the text the model reads","materiality":"security","direction":"neutral","scoreDelta":null,"occurredOn":"2026-10-23","url":"https://verifymcp.io/servers/com-tallyfern-rates/mcp#chg-chg_01a168d9-b67b-729f-99b3-cd16e41583d1"},{"id":"chg_01a168d9-b67b-7b96-aa99-8b6d5dae460f","kind":"tool.description_changed","summary":"Tool “ontario_hst_basics” rewrote its description, which is the text the model 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