Fitfly Engine MCP Server

by dropflyai Your server? Claim it

answering

Fitfly Engine is answering right now. Last checked 13 min ago. It exposes 10 tools.

Deterministic fitness coaching engine: adaptive programs, progression math, readiness autoregulation

Uptime history 48 days of history · worst day 35%

48 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

350 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check Fitfly Engine every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 13 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add fitfly-engine --transport http https://workout-engine-production-5dd7.up.railway.app/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "fitfly-engine": {
      "url": "https://workout-engine-production-5dd7.up.railway.app/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.fitfly-engine]
url = "https://workout-engine-production-5dd7.up.railway.app/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "fitfly-engine": {
      "url": "https://workout-engine-production-5dd7.up.railway.app/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "fitfly-engine": {
      "url": "https://workout-engine-production-5dd7.up.railway.app/mcp"
    }
  }
}

Available tools 10

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

swap

list_swap_options

Valid alternatives for an exercise — same muscle group, filtered to the athlete's equipment/level/injuries. Use before swap_exercise.

swap_exercise

Replace an exercise with a valid same-area alternative. scope 'today' = just this session; scope 'program' = going forward. The new lift starts fresh (day-one calibration).

changelog

changelog

The 'what changed & why' feed — the engine's coaching decisions (volume bumps, deloads, swaps) in Coach Fly's voice. Use to explain to the athlete why their plan evolved.

log

log_workout

Record what the athlete actually lifted. The engine runs progression (double-progression, e1RM), detects PRs, and returns per-exercise outcomes (established/progressed/held/deloaded) with next-time targets. Weights are in kg.

meal

meal_plan

A day of meals hitting the athlete's targets, USDA truth-checked (flags feasible=false with a note when macros are approximate). Slow (~15s AI call).

nutrition

nutrition_targets

The athlete's daily calorie + macro targets, computed from body stats, activity, and goal.

program

get_program

The athlete's current multi-day program (render-ready).

readiness

readiness_checkin

Record how the athlete feels today (energy, sleep, soreness — each 1–5). The engine scores readiness and, on the next get_todays_session, reshapes the workout accordingly (reduce volume / reduce intensity / recovery day). Returns the readiness score + modifier.

regenerate

regenerate_program

Rebuild the whole program from the stored profile (~20s AI generation). Use after a profile change or a plateau.

todays

get_todays_session

Today's workout: exercises, sets/reps, per-exercise load guidance and concrete target weights, plus nutrition targets and cycle status. Auto-applies the user's readiness check-in (autoregulation) if they've done one today. Call this to see what the athlete should do now.

Endpoints

URL	Transport	State	Latency	Checked
https://workout-engine-production-5dd7.up.railway.app/mcp	streamable-http	answering	410 ms	13 min ago

Alternatives to Fitfly Engine

same job, measured the same way

Fitness Tools

by almostjacked

Deterministic fitness calculators — TDEE, adaptive TDEE, body fat, 1RM, macros — with consensus.

61 installs/wk 10 tools answering

Archiet Xray

by anioko

Deterministic repo architecture maps: auth coverage, blast radius, readiness score, diagrams

159 installs/wk local only

KATA Research Automation

by dharan1007

Deterministic research automation with live OpenAlex search and reusable workflow programs.

answering

Decker

by gigshow

Deterministic market-state engine for trading agents — state, gate, coordinates, with receipts.

12 tools answering

Euclid-MCP

by meob

Deterministic logical reasoning engine — facts in Euclid IR, solutions with proof trees

256 installs/wk local only

Agent Arbitration

by jdhart81

Deterministic, machine-verifiable dispute resolution for A2A escrows.

8 tools answering

Peptigraph

by peptigraph

Deterministic peptide reconstitution and dosing math, so assistants compute it instead of guessing.

2 tools answering

TinyFn

by tinyfn

500+ deterministic tools for AI agents: math, conversion, validation, hashing, encoding, date/time.

572 tools answering

Fitfly Engine — questions

Answers built from our own checks of this server.

What can Fitfly Engine do?

It exposes 10 tools, read directly from the server on our last check. Among them: changelog, get_program, get_todays_session, list_swap_options, log_workout, meal_plan and 4 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Fitfly Engine working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 350 ms. The bar chart above shows every period we have measured.

How do I connect Fitfly Engine?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Fitfly Engine need an API key?

No. Fitfly Engine completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 10 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Fitfly Engine?

It answers our handshake in 350 ms on average, which is faster than 44% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.