@gripforgeai/mcp

Attach weapons & props to rigged characters — from Claude Code, Cursor or any MCP client. Thin client for the GripForge API.

Hosted endpoint (zero install)

No Node required — point any remote-capable MCP client at:

Code

https://gripforge.ai/mcp

Auth: x-api-key: gf_... header (or Authorization: Bearer). Assets are passed as URLs (character_url, prop_url) — Tripo/Meshy download links work directly.

jsonc

// Cursor (.cursor/mcp.json)
{
  "mcpServers": {
    "gripforge": {
      "url": "https://gripforge.ai/mcp",
      "headers": { "x-api-key": "gf_..." }
    }
  }
}

Example

"Attach this sword to my knight, right hand, then export the armed GLB."

The agent calls gripforge_attach with the two asset URLs (or local paths with the npm package); GripForge finds the hand bone, scales the prop to the character's hand, closes the fist around the grip and returns the bind JSON, ready-to-paste Three.js / Unity / Godot snippets, and optionally the armed GLB.

Install (Claude Code)

Terminal

claude mcp add gripforge -e GRIPFORGE_API_KEY=gf_... -- npx -y @gripforgeai/mcp

Or in .mcp.json:

config.json

{
  "mcpServers": {
    "gripforge": {
      "command": "npx",
      "args": ["-y", "@gripforgeai/mcp"],
      "env": { "GRIPFORGE_API_KEY": "gf_..." }
    }
  }
}

Get a free API key at https://gripforge.ai/login — the free plan includes 3 API/MCP attaches per month to try it out (plus 15 in the web Studio). Paid plans from €29/mo for production use.

Install (Grok)

bash

grok mcp add gripforge --env GRIPFORGE_API_KEY=gf_... -- npx -y @gripforgeai/mcp

Or in ~/.grok/config.toml:

toml

[mcp_servers.gripforge]
command = "npx"
args = ["-y", "@gripforgeai/mcp"]
enabled = true
startup_timeout_sec = 45

[mcp_servers.gripforge.env]
GRIPFORGE_API_KEY = "gf_..."

Also works with Cursor, Windsurf and any MCP-compatible client — same command / args / env triple.

Tools

gripforge_style_kit — resolve "Devil May Cry like" / "genshin" to locker ids already tagged with that look. Call this before generating. Reuse the ids.
gripforge_generate_character — new T-pose + auto-rig into Library (10 credits). kind=enemy or the word "enemy" in the prompt. Skip this if style_kit already returned a character.
gripforge_concept_correct — concept image → strict T-pose sheet (1 credit).
gripforge_attach — character + prop (paths or Library ids) in, bone-local bind + Three.js / Unity / Godot snippets out. Styles: melee, gun, shield, staff (scythe/polearm). With export_glb: true (+ out_dir) it also writes attached.glb: the character with the fist closed and the prop attached, textures preserved — use this for mitten-hand rigs, whose closed fist cannot travel in a JSON bind.
gripforge_formats — supported formats & options.
gripforge_library_list / get / push / pull — the Library locker. pull writes bind.json + mesh into the open repo (out_dir, default ./gripforge-library). Saving a bind after attach is not a second credit.
gripforge_texture_prep — local path or texture_id → seamless blend + faithful lanczos upscale (1×/2×/4×, max 1024 or 2048). Writes the PNG into out_dir and returns the Library albedo URL. Not a generator. No credit.
gripforge_vfx / gripforge_vfx_preview — strike VFX (admin keys).
gripforge_shaders — list the authorized shader catalog ({ id, name, engines }). Search q=slash_reveal.
gripforge_shader_pull — id + engine (godot|unity|three) + out_dir → write sources into the repo and return an assignment snippet. v1 pull is free.

Env

GRIPFORGE_API_KEY (required) — 1 credit = 1 successful attach
GRIPFORGE_API_URL (optional) — defaults to https://gripforge.ai