io.github.codymcc4/fuelcenter

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

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

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "fuelcenter": {
      "url": "https://fuelcenter.co/api/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (7)

• fueling-plan read-only

  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:

  • hours (required) — number — Race or run duration, hours portion.
  • minutes (required) — number — Race or run duration, minutes portion.
  • intensity (required) — string — Effort level.
  • gelKey (required) — string — Gel product key. See /api/tools/gel-comparison for full catalog.
  • buffer — number — Minutes of buffer at start and end where no gel is taken. Default 5.
  • drinkMix — boolean — Whether the runner uses a carbohydrate drink mix. Default false.
  • targetCPH — number — Target carbs per hour. If omitted, default is derived from guideline.
  • experience — string — Runner experience with fueling. Default "standard".
  • drinkCarbsTotal — number — Total grams of carbs from drink mix across the run. Default 0.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• race-time-predictor read-only

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

  Parameters:

  • knownDistanceMiles (required) — number — Distance of your recent race, in miles.
  • knownTimeSeconds (required) — number — Finish time for that race, in total seconds.
  • exponent — number — Riegel exponent. Default 1.06.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• pace-calculator read-only

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

  Parameters:

  • mode (required) — string — Which field to solve for.
  • totalSeconds — number — Required for mode "pace" or "distance".
  • distanceMiles — number — Required for mode "pace" or "time".
  • paceSecondsPerMile — number — Required for mode "time" or "distance".

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• heat-adjustment read-only

  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:

  • paceSecondsPerMile (required) — number — Your goal pace in seconds per mile (cool-weather pace).
  • distanceMiles (required) — number — Race distance in miles.
  • tempF (required) — number — Air temperature at race time in degrees Fahrenheit.
  • humidity (required) — number — Relative humidity as a percentage, 0-100.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• hydration read-only

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

  Parameters:

  • bodyWeightLbs (required) — number — Body weight in pounds.
  • durationMinutes (required) — number — Run or race duration in minutes.
  • intensity (required) — string — Effort level.
  • tempF (required) — number — Temperature in Fahrenheit.
  • humidity (required) — number — Relative humidity, 0-100.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• carb-loading read-only

  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:

  • bodyWeightLbs (required) — number — Body weight in pounds.
  • raceType (required) — string — Race distance category.
  • finishTimeHours (required) — number — Expected finish time, hours portion.
  • finishTimeMinutes (required) — number — Expected finish time, minutes portion.
  • experience (required) — string — Runner experience level.
  • hasGIIssues — boolean — Whether the runner has a sensitive stomach. Default false.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• gel-comparison read-only

  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:

  • sortKey — string — Column to sort by. Default "carbsPerDollar".
  • sortDirection — string — Sort direction. Default "desc".

  Hints: read-only yes · destructive no · idempotent yes · open-world no

Publisher website Repository

Measured by MCPYP probing. Untested fields are omitted, never estimated. Listing is always free; MCPYP never proxies calls or stores user tokens.