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mcp-flux-studio

MCP server that wraps the Flux image generation API. Exposes text-to-image, image-to-image, inpainting, and structural control (canny/depth/pose) as MCP tools over stdio. The server itself is TypeScript; it shells out to a Python CLI (fluxcli.py) for actual API calls.

What It Does

Receives MCP tool calls, builds command-line arguments, spawns python3 fluxcli.py <subcommand> ... against a local Flux installation, and returns the output. Requires a BFL_API_KEY for the Flux API and a local copy of the Flux CLI.

Related MCP server: Minimax MCP Tools

Status

Area

State

MCP transport

stdio

Language

TypeScript (server) + Python (CLI wrapper)

Flux models

flux.1.1-pro, flux.1-pro, flux.1-dev, flux.1.1-ultra

Tests

Jest, 2 test files

IDE tested

Cursor v0.45.7+, Windsurf/Codeium Wave 3+

npm package

flux-mcp-server v1.0.0

License

MIT

MCP Tools

Tool

Required Params

Optional Params

Output

generate

prompt

model, aspect_ratio, width, height, output

Generated image path

img2img

image, prompt, name

model, strength (0-1), width, height, output

Transformed image path

inpaint

image, prompt

mask_shape (circle/rectangle), position (center/ground), output

Inpainted image path

control

type (canny/depth/pose), image, prompt

steps (1-100), guidance, output

Controlled image path

Width and height are validated to 256-2048 range.

Setup

Via Smithery

npx -y @smithery/cli install @jmanhype/mcp-flux-studio --client claude

Manual

git clone https://github.com/jmanhype/mcp-flux-studio.git
cd mcp-flux-studio
npm install
npm run build
npm start

Environment Variables

Variable

Required

Description

BFL_API_KEY

Yes

Flux API key

FLUX_PATH

No

Path to Flux CLI installation (default: /Users/speed/CascadeProjects/flux)

VIRTUAL_ENV

No

If set, uses $VIRTUAL_ENV/bin/python instead of python3

IDE Configuration

Cursor: Settings > Features > MCP. Supports stdio and SSE.

Windsurf/Codeium: Edit ~/.codeium/windsurf/mcp_config.json.

Architecture

src/
  index.ts   — MCP server, tool handlers, Python process spawning
  types.ts   — TypeScript interfaces for tool arguments
  cli/
    fluxcli.py — Python CLI that calls the Flux API (not in this repo's src)
tests/
  server.test.ts
  types.test.ts

Limitations

  • Shells out to Python for every tool call; each call spawns a new process

  • The default FLUX_PATH is hardcoded to a local directory

  • No connection pooling or request queuing for the Flux API

  • No image previews returned in MCP responses — only file paths

  • The ControlType type is referenced but not imported in index.ts

  • No progress reporting during generation

Dependencies

Package

Version

Purpose

@modelcontextprotocol/sdk

^0.1.0

MCP server protocol

dotenv

^16.0.3

Environment variable loading

typescript

^5.0.3

Build toolchain

jest

^29.5.0

Test runner

License

MIT

Install Server
A
security – no known vulnerabilities
A
license - permissive license
-
quality - not tested

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