fastclaude

fastclaude is a small, completions-style Python interface backed by the installed Claude Code executable. It inherits Claude CLI authentication, including OAuth and subscriptions, without requiring direct Anthropic API integration.

One call is one stateless completion:

• accepts complete, editable histories as aidialog.msg_parts.Msg objects
• compiles them into real Claude Code sessions rather than flattening them into a prompt
• advertises tools as schemas and ends the run at a tool_use, so the caller owns the tool loop
• accepts a history ending in a ToolResult, so the standard completions tool loop just works
• streams Claude output and supports native interruption
• remains stateless across requests

See DEV.md for the design record and protocol findings.

Installation

pip install fastclaude

Development

pip install -e .

License

Apache License 2.0.