TrimCarbon MCP server

• Registry namecom.trimcarbon/flight-emissionsverified in the MCP registry

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

• Stateanswerschecked 2026-10-28
• Tools10
• Server calls itselftrimcarbon
• Server version1.2.0
• Protocol version2025-06-18

On 2026-10-28 the server answered initialize and tools/list without a sign-in. First answer in 133 ms.

• Whether its tools do the product's job has not been judged yet.
• Checked on 6 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: 6 so far
• Answeredmeasuring6 of the 7 daily checks it takes to print a share
• Median first answer162 ms
• Space in an agent's context≈ 1,520 tokensthe definitions of all its tools (10), which an agent carries on every turn
• Tool definitionsA · 100 of 100
• Typed results10 of 10 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 →

• search_aircraft

  Finds the aircraft types TrimCarbon has figures for, by name (e.g. "Cessna 172", "Skyhawk"), ICAO type designator (e.g. "C172", "PA28") or page slug. Returns each type with its kg of CO₂ per flight hour. The list covers about 60…

• estimate_flight_hours

  Estimates the CO₂ from flying hours in one or more aircraft types: one row for a pilot, several rows for a fleet (a school, club or operator). CO₂ = hours × the type’s kg of CO₂ per flight hour, from its fuel flow at about 75% power…

• estimate_fuel_burn

  Estimates the CO₂ from burning an amount of aviation fuel: avgas 100LL, mogas (motor gasoline) or Jet A, in US gallons, liters or kg. Uses the US EPA factor per US gallon and the fuel’s density for liters and kg.

• import_logbook

  Opens a card where the user picks a logbook export from ForeFlight, Garmin Pilot or LogTen. The card reads the file on the user’s device, uploads nothing, and shows the flight hours and CO₂ by aircraft type. The user can then share those…

• quote_offset

  Returns what TrimCarbon charges to offset an amount of CO₂: a one-time purchase in whole tonnes, and for yearly amounts the monthly and yearly plans. Each option has a link to continue on trimcarbon.com, where the user signs up and pays…

• get_my_account

  Shows the signed-in TrimCarbon account: email, current offset plan (monthly or yearly, kg of CO₂ per period, renewal date) and offset API access. Needs the user to connect their TrimCarbon account.

• get_my_impact

  Shows how much CO₂ the signed-in user has offset with TrimCarbon: the total, what is still being processed, by source (one-time, subscription, offset API), by year, and the projects funded. Needs the user to connect their TrimCarbon…

• list_my_offsets

  Lists the signed-in user’s TrimCarbon offset orders, newest first: date, source, kg of CO₂, status and the public certificate link once issued. Needs the user to connect their TrimCarbon account.

• get_certificate

  Shows one of the signed-in user’s TrimCarbon certificates: kg of CO₂, holder, dates, projects with their registries and retirement serial numbers, and links to the public certificate and its PDF. Takes the certificate number…

• get_api_impact

  For a company that uses the TrimCarbon offset API: how much CO₂ it has offset through the API, in total, in the last 30 days and by month, and its API access status. Needs the user to connect their TrimCarbon account.