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Sibyl

The oracle for Google's Gemini.

Where Pythia speaks for OpenAI, Sibyl speaks for Gemini. One MCP across the whole generative surface: text, image, video, speech, embeddings, and deep research. Built for personal use, shared openly, not productised.


Sibyl is a local Model Context Protocol server wrapping Google's Gemini generative API. It folds the old nano-banana (image) and gemini-deep-research servers into one coherent Gemini surface, and adds text, video, speech and embeddings, so an assistant reaches everything Gemini generates through a single tool set.

Tools

Tool

What it does

generate

Text, code, chat and reasoning with Gemini

generate_image / edit_image

Generate or edit images (Nano Banana). Edit takes one or more inputs for compositing and iterative refinement

generate_video / video_status

Generate video with Veo. Async: fire, then poll

speak

Text to speech with Gemini TTS

embed

Embedding vectors for one or more texts

deep_research / research_get / research_followup

Fire an autonomous multi-step research task, poll it, and save a cited Markdown report; ask follow-ups without re-running

Related MCP server: gemini-webapi-mcp

Requirements

Install

git clone https://github.com/hello-emrah/sibyl-mcp.git
cd sibyl-mcp
npm install

Wire into Claude

{
  "mcpServers": {
    "sibyl": {
      "command": "node",
      "args": ["/absolute/path/to/sibyl-mcp/index.js"],
      "env": { "GEMINI_API_KEY": "your-key" }
    }
  }
}

Config

Variable

Purpose

GEMINI_API_KEY

Required. Your Gemini API key.

GEMINI_DEEP_RESEARCH_API_KEY

Optional. A separate key for the research agent; falls back to GEMINI_API_KEY.

GEMINI_TEXT_MODEL / GEMINI_IMAGE_MODEL / GEMINI_VIDEO_MODEL / GEMINI_TTS_MODEL / GEMINI_EMBED_MODEL

Optional model overrides; sensible current defaults otherwise.

SIBYL_OUTPUT_DIR

Where research reports and embedding files land by default.

License

MIT.

A
license - permissive license
-
quality - not tested
C
maintenance

Maintenance

Maintainers
Response time
Release cycle
Releases (12mo)
Commit activity

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