RunAPI Flux MCP Server
Flux API access for AI agents: run image generation operations, poll asynchronous results, and check pricing through one focused MCP server.
Works with Claude Code, Codex, Cursor, Windsurf, VS Code, Roo Code, and any MCP-compatible host.
Install |
Tools |
Models |
Agent Prompts |
Configuration |
Links
Why This Package?
@runapi.ai/flux-mcp is a focused Model Context Protocol server for the Flux model line on RunAPI.
It gives MCP-compatible assistants direct access to 2 endpoints and 3 model variants without loading the full RunAPI catalog.
Use this per-model server when an agent should stay scoped to Flux. Use @runapi.ai/mcp when one assistant should discover every RunAPI model line.
Install
Add it to Claude Code:
claude mcp add flux -s user -- npx -y @runapi.ai/flux-mcp
Use project scope when the server should be shared with a repository:
claude mcp add flux -s project -- npx -y @runapi.ai/flux-mcp
Codex, Cursor, Windsurf, VS Code, Roo Code, and other MCP hosts can use the same stdio command:
{
"mcpServers": {
"flux": {
"command": "npx",
"args": ["-y", "@runapi.ai/flux-mcp"]
}
}
}
check_pricing works before sign-in. For task creation and status polling, ask your assistant to call the login tool. It opens a browser login and saves credentials to ~/.config/runapi/config.json, the same file used by runapi login.
Headless and CI hosts can still set RUNAPI_API_KEY before starting the MCP host.
Ready-made examples are in examples/ for Claude, Cursor, Windsurf, VS Code, and Roo Code.
| Tool | Auth | Purpose |
|---|
remix_image | Yes | Create a Flux remix image task and optionally wait for a terminal status. Returns the task id, status, output URLs, and pricing snapshot. |
text_to_image | Yes | Create a Flux text to image task and optionally wait for a terminal status. Returns the task id, status, output URLs, and pricing snapshot. |
get_task | Yes | Fetch the current status and latest payload for an existing task. |
check_pricing | No | Look up the current pricing snapshot for a Flux model and endpoint. |
Models
Flux covers 3 model variants across 2 endpoints. Each tool accepts the models listed for it:
| Tool | Models |
|---|
remix_image | flux-dev, flux-pro |
text_to_image | flux-2-klein, flux-dev, flux-pro |
Model availability can change between releases. Use check_pricing or the Flux model page for the current catalog view.
Agent Prompts
Ask your assistant in natural language; it can inspect pricing, create the task, and return the task id plus output URLs.
Create a task
Run a Flux remix image task with RunAPI.
The assistant can call check_pricing, then remix_image, and return the task id, status, and output URLs.
Submit without waiting
Create the task but don't wait for it to finish.
The assistant calls the create tool with wait: false and returns the task id. Check on it later with get_task.
Check pricing before creating
Check current Flux pricing, then create the task if it matches my request.
The assistant calls check_pricing and can link to the Flux model page for the canonical catalog entry.
Configuration
The server resolves auth in this order:
RUNAPI_API_KEY environment variable, useful for headless and CI hosts~/.config/runapi/config.json, created by the MCP login tool or runapi login- No key, which still allows
check_pricing
The config file is normally managed by login. A pre-provisioned headless config can use:
{
"apiKey": "your_runapi_key"
}
Do not commit real API keys.
Links
License
Licensed under the Apache License, Version 2.0.