| FMRS | 69 / 100 · C | 77 / 100 · B |
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| Reliability | 10 / 20 | 12 / 20 |
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| Security and permissions | 15 / 20 | 16 / 20 |
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| Maintenance | 13 / 20 | 16 / 20 |
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| Documentation | 17 / 20 | 18 / 20 |
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| Setup experience | 14 / 20 | 15 / 20 |
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| Best for | - Users whose machine can carry local diffusion (a discrete GPU with >= 24 GB VRAM is ideal; Apple Silicon with >= 32 GB unified memory is OK for images)
- Users who want to automate a local ComfyUI workflow from Claude Code, Claude Desktop, Cursor or any MCP-speaking client
- Users who need to introspect live nodes, models and templates, custom nodes included
- Users running a local LLM and ComfyUI on the same GPU who need the read/free VRAM loop
| - 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 | - Users who want Comfy Cloud execution, cloud queue or cross-session cloud batches — this server has no path to Comfy Cloud, use https://cloud.comfy.org/mcp instead
- Machines with under 8 GB VRAM or a confirmed absence of a GPU (use partner nodes or the cloud MCP)
- Users who need lifecycle management (launch/stop/update/version-switch/install nodes/logs) on a remote box — those tools are local-only
- Users running the MCP on a remote or containerised host who need the browser sign-in callback to land on their machine
| - 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 | - Runs the comfy command as a subprocess on your machine, carrying the server process's full environment
- Reads ComfyUI workspace files, including workflow JSON and input assets
- Writes generated outputs, by default into the ComfyUI workspace's output/ directory; fetch_outputs can copy them to a directory you name
- Writes/installs models and node packs on this machine (download_model, install_node)
- Reads, launches, stops or restarts the local ComfyUI process
- launch_comfyui with --listen exposes an unauthenticated ComfyUI to the network and requires explicit confirmation
- COMFY_API_KEY is used for partner-API nodes and can spend Comfy credits through those nodes
- COMFY_MCP_ASSUME_CONSENT can pre-authorize the install_node, update_all, version_switch, kill_untracked and network_exposure gates (spending is excluded)
| - 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 | - Partner generation (partner_generate, workflows or templates containing partner-API nodes) really spends Comfy credits and is confirmed at call time; an agent host's 'always allow this tool' toggle is never treated as spend consent
- An arbitrary custom node can still call a paid service of its own — the confirm_spend gate only covers partner-API nodes comfy-cli recognizes, so check a workflow you did not build before running it
- launch_comfyui with --listen binds an unauthenticated ComfyUI to your network, exposing it to others
- Installing node packs, switching versions, updating ComfyUI and force-restarting a server it did not start modify your local environment; tools fail closed when the client does not show the confirmation prompt
- With a remote COMFYUI_URL configured, system_stats / free_memory still act on the local install, so you may measure and free the wrong machine; the remote ComfyUI must be reachable and unauthenticated on that network
- COMFY_MCP_ASSUME_CONSENT is a setting written in your client config; granting too much silently widens the risks above
- The server is beta, so behaviour may change
| - 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 Code, Claude Desktop, Cursor | Claude Desktop, Cursor, Codex, Antigravity |
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| Tools | 30 | 26 |
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