Simon Willison's LLM library has quietly become an agent framework, and a working Claude-Code-style coding agent (file read/edit, shell exec with process-tree-kill on timeout, glob/regex search, gitignore-aware listing) was built on it in two prompts and shipped to PyPI—runnable today via uvx with a Python API like CodingAgent(model=..., root=..., approve=True).run(...). Practically, this means you can embed a scriptable, permission-gated coding agent (with --allow allowlists and --yolo modes) directly into Python workflows without adopting a heavyweight vendor SDK, though it's a slop-alpha so treat it as a prototype, not production tooling.