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@runapi.ai/flux-2-mcp

@runapi.ai/flux-2-mcp

Official
by runapi-ai
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Why This Package?

@runapi.ai/flux-2-mcp is a focused Model Context Protocol server for the Flux 2 model line on RunAPI. It gives MCP-compatible assistants direct access to 2 endpoints and 6 model variants without loading the full RunAPI catalog.

Use this per-model server when an agent should stay scoped to Flux 2. Use @runapi.ai/mcp when one assistant should discover every RunAPI model line.

Related MCP server: flux-replicate-mcp

Install

Add it to Claude Code:

claude mcp add flux-2 -s user -- npx -y @runapi.ai/flux-2-mcp

Use project scope when the server should be shared with a repository:

claude mcp add flux-2 -s project -- npx -y @runapi.ai/flux-2-mcp

Codex, Cursor, Windsurf, VS Code, Roo Code, and other MCP hosts can use the same stdio command:

{
  "mcpServers": {
    "flux-2": {
      "command": "npx",
      "args": ["-y", "@runapi.ai/flux-2-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.

Tools

Tool

Auth

Purpose

remix_image

Yes

Create a Flux 2 remix image task and optionally wait for a terminal status. Returns the task id, status, and output URLs.

text_to_image

Yes

Create a Flux 2 text to image task and optionally wait for a terminal status. Returns the task id, status, and output URLs.

get_task

Yes

Fetch the current status and latest payload for an existing task.

check_pricing

No

Look up current pricing for a Flux 2 model and endpoint.

Models

Flux 2 covers 6 model variants across 2 endpoints. Each tool accepts the models listed for it:

Tool

Models

remix_image

flux-2-flex-remix-image, flux-2-max-remix-image, flux-2-pro-remix-image

text_to_image

flux-2-flex-text-to-image, flux-2-max-text-to-image, flux-2-pro-text-to-image

Model availability can change between releases. Use check_pricing or the Flux 2 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 2 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 2 pricing, then create the task if it matches my request.

The assistant calls check_pricing and can link to the Flux 2 model page for the canonical catalog entry.

Configuration

The server resolves auth in this order:

  1. RUNAPI_API_KEY environment variable, useful for headless and CI hosts

  2. ~/.config/runapi/config.json, created by the MCP login tool or runapi login

  3. 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

Resource

URL

Flux 2 model page

https://runapi.ai/models/flux-2

npm package

@runapi.ai/flux-2-mcp

GitHub repository

runapi-ai/flux-2-mcp

RunAPI MCP overview

runapi.ai/mcp

RunAPI docs

runapi.ai/docs

License

Licensed under the Apache License, Version 2.0.

Available Tools

5 tools
check_pricingC

Look up RunAPI pricing for the flux-2 model line.

Inputs: model, action.

get_taskB

Fetch the current status and latest result payload for a flux-2 task.

Inputs: action (required), task_id (required).

loginA

Authenticate RunAPI by opening a browser PKCE login flow and saving the API key to ~/.config/runapi/config.json.

Inputs: force.

remix_imageC

Create a Flux 2 task on RunAPI (remix image). Returns a task id, status, and output URLs.

Inputs: prompt (required), source_image_urls (required), wait, model, +7 more.

text_to_imageB

Create a Flux 2 task on RunAPI (text to image). Returns a task id, status, and output URLs.

Inputs: prompt (required), wait, model, timeout_ms, +6 more.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

Loading tool schema changelog…

    Deploy Server
    One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

    TDQS

    B3.4/5.0

    Scored across 5 tools

    Disambiguation5/5

    Each tool has a clearly distinct purpose: login handles authentication, check_pricing fetches pricing, get_task polls status, and remix_image/text_to_image create different task types. No overlap exists between any tools.

    Naming Consistency4/5

    Most tools follow a verb_noun snake_case pattern (get_task, check_pricing, remix_image, text_to_image), but 'login' breaks the pattern as a bare verb. Still predictable overall.

    Tool Count5/5

    Five tools is well-scoped for a Flux 2 image generation client, covering auth, pricing, task creation, and status retrieval without redundancy. Each tool earns its place.

    Completeness4/5

    Core workflow (create task, poll status) is covered, plus auth and pricing. Missing task management operations like list/cancel/delete, but these are non-essential for basic usage.

    Maintenance

    ActivityMaintained
    ResponsivenessNo recent community issues

    Resources

    Related MCP Connectors

    Related MCP Servers