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marvin

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SUMMARY

Interactive CLI chatbot built on Rig with Claude: streaming, tools, persistence. Includes an upstream fix to Rig.

README.md

marvin

A small CLI chat application built to learn the Rig framework in Rust.

What it does

Runs an interactive terminal chat loop backed by Anthropic's Claude via Rig. Supports a configurable preamble (system prompt) in src/chat/preamble.txt and maintains conversation history across turns.

User Commands

Command Description
/model Switch between available Claude models
/tokens Show token usage
/history Show last 10 messages from chat history
/save Save chat history to file
/import <id> Import chat history from a saved file
/summarize Ask the agent to summarize the conversation
/compact Condense conversation history
/clear Clear chat history
/help List all available commands
/exit Print farewell message and end the session

Agent Tools

The AI agent can invoke the following tools during conversation:

Math Tools

Tool Description
add Add two numbers
subtract Subtract two numbers
multiply Multiply two numbers
divide Divide two numbers

Web Tools (via Tavily API)

Tool Description
search_web Search the web for current information
extract_url Extract clean content from specific URLs
crawl_website Crawl a website and extract content from linked pages
map_website Discover all URLs on a website without extracting content

Setup

  1. Clone the repo and make sure you have Rust installed (rustup / cargo).
  2. Copy .env.example to .env and fill in your values:
    • ANTHROPIC_API_KEY — your Anthropic API key
    • TAVILY_API_KEY — your Tavily API key (for web tools)
  3. Build and run:
cargo run

Goal

This project exists to learn Rig by reading its source, experimenting with its APIs, and building up features incrementally. Contributions and experiments are welcome.

License

MIT — see LICENSE.

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