Tallyfern MCP server

• Registry namecom.tallyfern/ratesverified in the MCP registry

The registry name sits under tallyfern.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

• Stateanswerschecked 2026-10-25
• Tools5
• Server calls itselftallyfern-rates
• Server version0.3.2
• Protocol version2025-06-18

On 2026-10-25 the server answered initialize and tools/list without a sign-in. First answer in 269 ms.

• Whether its tools do the product's job has not been judged yet.
• Checked on 3 of the 7 days it takes to judge reliability.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

• INITE MCP scoreafter a weeka score needs 7 daily checks: 3 so far
• Answeredmeasuring3 of the 7 daily checks it takes to print a share
• Median first answer258 ms
• Space in an agent's context≈ 1,196 tokensthe definitions of all its tools (5), which an agent carries on every turn
• Tool definitionsA · 100 of 100
• Typed results5 of 5 toolsdeclared outputSchema: results come typed, read once

• Every tool passes all six checks.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

• gst_hst_small_supplier_check

  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…

• gst_hst_rate_by_province

  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…

• cra_automobile_allowance_rate

  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…

• cra_meal_travel_allowance

  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…

• ontario_hst_basics

  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…