ApiUI

Chat with any API. Supply an OpenAPI spec, get a conversational interface with built-in visualization.

What It Does

1. Point it at an OpenAPI spec - ApiUI auto-generates LLM tools for every endpoint
2. Chat naturally - Ask questions, request data, trigger actions
3. See results visually - Charts, images, files, links rendered in the UI

Quick Start

# Agent server
cd agent
pip install -e ".[dev]"
uvicorn server:app --reload

# Flutter app (separate terminal)
cd flutter_app
flutter run

Set ANTHROPIC_API_KEY in your environment.

Features

• Auto-generated tools from OpenAPI specs (JSON/YAML)
• Rich UI rendering - markdown, charts, images, file downloads
• OAuth support - Google, GitHub, etc.
• Session persistence - encrypted tokens, conversation history
• Meta tools - bundles large specs (900 endpoints → ~10 tools)

Supported Specs

Currently: OpenAPI 3.x (JSON/YAML)

Coming soon: GraphQL, gRPC, AsyncAPI

Example

You: "What repos does anthropics have on GitHub?"

ApiUI: anthropics has 12 public repositories:
       - claude-code (TypeScript, mass stars)
       - anthropic-sdk-python (Python)
       - courses (Jupyter Notebook)
       [displays as clickable links]

You: "Show stars over time as a line chart"

ApiUI: [renders line chart of star counts]

Configuration

Drop your spec in agent/specs/ and update agent/config/agent_config.json:

{
  "openapi_spec_path": "specs/your-api.yaml",
  "tool_mode": "meta"
}

Architecture

flowchart LR
    subgraph Client
        Flutter[Flutter App]
    end

    subgraph Server
        Agent[Agent Server]
    end

    LLM[LLM Provider]
    API[Any API]

    Flutter <-->|HTTP| Agent
    Agent <-->|API| LLM
    Agent <-->|HTTP| API

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Docs

• Specification
• Meta Tools

License

MIT