| FMRS | 55 / 100 · C | 77 / 100 · B |
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| Reliability | 9 / 20 | 12 / 20 |
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| Security and permissions | 8 / 20 | 16 / 20 |
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| Maintenance | 11 / 20 | 16 / 20 |
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| Documentation | 14 / 20 | 18 / 20 |
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| Setup experience | 13 / 20 | 15 / 20 |
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| Best for | - Users who want an agent to operate ComfyUI rather than only relay prompts.
- Local GPU, LAN, VPS, RunPod, and Comfy Cloud users.
- Creators who need model-specific generation skills, workflow recipes, and troubleshooting.
- Users of Claude Code, Claude Desktop, or other MCP-capable agents.
| - Hevy PRO users who want AI assistants to directly access their workout data
- People who prefer using MCP clients like Claude, Cursor, Codex for fitness tracking
- Anyone needing summaries and insights from their training data
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| Not for | - Minimal connector use cases that only forward prompts and return images.
- Users without a ComfyUI instance or reachable remote ComfyUI.
- Models that do not support tool calling.
- Users seeking official Comfy maintenance or an official cloud-service guarantee.
| - Users without a Hevy PRO subscription (API key required)
- Users who want to use the server without an API key
- Those needing delete workflows (Hevy API does not expose delete endpoints)
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| Required permissions | - Requires access to the ComfyUI REST API and WebSocket.
- Local mode may read and write model, input, output, and workflow-library directories.
- Process-control features may start, stop, or restart local ComfyUI.
- Model and node discovery or downloads may access Hugging Face, CivitAI, GitHub, and the ComfyUI Registry; some features require tokens.
- Comfy Cloud mode requires COMFYUI_API_KEY.
| - Requires HEVY_API_KEY environment variable for Hevy API authentication
- Can create, update, and replace workouts, routines, folders, templates, and body measurements via tools
- Read operations can fetch workouts, routines, folders, templates, history, and user info
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| Risks and side effects | - Workflow execution can consume local GPU VRAM, compute, and disk space.
- Downloaded models and custom nodes can be large and may include third-party code.
- stop_comfyui, restart_comfyui, and queue operations can interrupt jobs or unsaved workflow changes.
- Remote HTTP, tunnel, or bridge deployments increase network exposure and should use tokens and access controls.
- Hosted API nodes may consume paid API credits.
| - API key can be misused if leaked; do not expose in URLs, logs, or screenshots
- Create operations may produce duplicates on retry; update operations replace existing records
- The server sends data to the Hevy API and may send telemetry to external services unless disabled
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| Supported clients | Claude Desktop, Claude Code, MCP Inspector, Hermes, OpenClaw, GitHub Copilot CLI, Ollama | Claude Desktop, Cursor, Codex, Antigravity |
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| Tools | 44 | 26 |
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