Cassady (cass) is a minimal Rust terminal coding agent with a looped chat UI, filesystem tools, access modes, JSONL conversation persistence, and OpenAI-compatible LLM support. The default endpoint is Fireworks.

Install

cargo install --path .

This installs both commands:

cass
cassady

Configure

By default Cass uses:

base URL: https://api.fireworks.ai/inference/v1
model: accounts/fireworks/models/qwen3p7-plus
API key env var: FIREWORKS_API_KEY

Set your key:

export FIREWORKS_API_KEY=...

Optional config lives at ~/.cass/config.json:

{
  "provider": "openai-compatible",
  "model": "accounts/fireworks/models/qwen3p7-plus",
  "base_url": "https://api.fireworks.ai/inference/v1",
  "api_key_env": "FIREWORKS_API_KEY",
  "default_access_mode": "read-only"
}

Extra global instructions can be placed in ~/.cass/global.md.

Usage

cass [--model MODEL] [--base-url URL] [--api-key-env ENV] [--cwd PATH]
cass --resume <chat-id>
cass --resume

cass --resume without an ID lists chats for the current directory.

Keys

Enter: send message
Ctrl-J: insert newline
Shift-Tab: toggle read-only/full-access mode while idle
Ctrl-O: toggle truncated/full tool output display
PageUp/PageDown or mouse wheel: transcript scroll
Ctrl-C twice within 1.5 seconds: exit

On exit Cass prints:

Resume this chat with: cass --resume <id>

Tools

Read-only mode allows ls, read, and grep within the launch cwd/--cwd.

Full-access mode additionally allows write and edit. Mutating tools use atomic writes where practical: Cass writes to a temporary file first, then renames it into place after validation/write success.

There is no shell/bash tool in v1.