io.github.codymcc4/fuelcenter

Official7 tools

Marathon fueling, pace, hydration, heat, carb-loading, and gel-comparison calculators.

Marathon training calculators for fueling, pacing, hydration, heat, and nutrition.

Captured live from the server via tools/list.

fueling-plan

Build a minute-by-minute race or long-run fueling plan. Returns target carbs/hour, gel count, gel timing schedule, and total carbs. This is the core FuelCenter tool.

Parameters (9)

hoursnumberrequired
Race or run duration, hours portion.
minutesnumberrequired
Race or run duration, minutes portion.
intensitystringrequired
Effort level.
experiencestring
Runner experience with fueling. Default "standard".
gelKeystringrequired
Gel product key. See /api/tools/gel-comparison for full catalog.
targetCPHnumber
Target carbs per hour. If omitted, default is derived from guideline.
drinkMixboolean
Whether the runner uses a carbohydrate drink mix. Default false.
drinkCarbsTotalnumber
Total grams of carbs from drink mix across the run. Default 0.
buffernumber
Minutes of buffer at start and end where no gel is taken. Default 5.

race-time-predictor

Predict your finish time at common distances (5K through 100 miles) from a recent race result using the Riegel formula.

Parameters (3)

knownDistanceMilesnumberrequired
Distance of your recent race, in miles.
knownTimeSecondsnumberrequired
Finish time for that race, in total seconds.
exponentnumber
Riegel exponent. Default 1.06.

pace-calculator

Given any two of distance, total time, or pace-per-mile, calculate the third. Returns pace per mile, per km, splits, and speed.

Parameters (4)

modestringrequired
Which field to solve for.
distanceMilesnumber
Required for mode "pace" or "time".
totalSecondsnumber
Required for mode "pace" or "distance".
paceSecondsPerMilenumber
Required for mode "time" or "distance".

heat-adjustment

Estimate how temperature and humidity will slow your race pace and change your fluid needs. Returns adjusted pace, slowdown percent, dew point, risk level, and fueling note.

Parameters (4)

paceSecondsPerMilenumberrequired
Your goal pace in seconds per mile (cool-weather pace).
distanceMilesnumberrequired
Race distance in miles.
tempFnumberrequired
Air temperature at race time in degrees Fahrenheit.
humiditynumberrequired
Relative humidity as a percentage, 0-100.

hydration

Estimate fluid and sodium needs for a race or long run based on body weight, duration, intensity, temperature, and humidity.

Parameters (5)

bodyWeightLbsnumberrequired
Body weight in pounds.
durationMinutesnumberrequired
Run or race duration in minutes.
intensitystringrequired
Effort level.
tempFnumberrequired
Temperature in Fahrenheit.
humiditynumberrequired
Relative humidity, 0-100.

carb-loading

Calculate pre-race carb loading targets by race type, body weight, finish time, and experience level. Returns daily carb target, protocol length, total carbs, and pre-race meal size.

Parameters (6)

bodyWeightLbsnumberrequired
Body weight in pounds.
raceTypestringrequired
Race distance category.
finishTimeHoursnumberrequired
Expected finish time, hours portion.
finishTimeMinutesnumberrequired
Expected finish time, minutes portion.
experiencestringrequired
Runner experience level.
hasGIIssuesboolean
Whether the runner has a sensitive stomach. Default false.

gel-comparison

Return the FuelCenter gel catalog (SiS Beta Fuel, Maurten, Precision, GU, Tailwind, Spring, Carbs Fuel, neversecond, Huma) with carbs, price, caffeine, weight, and carbs-per-dollar. Optionally sort.

Parameters (2)

sortKeystring
Column to sort by. Default "carbsPerDollar".
sortDirectionstring
Sort direction. Default "desc".

Install

claude_desktop_config.json

{
  "mcpServers": {
    "fuelcenter": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://fuelcenter.co/api/mcp"
      ]
    }
  }
}

Desktop config is stdio-only; this bridges via mcp-remote. Native remote: Settings > Connectors.