pi-wierd-anthropic

Claude Pro/Max OAuth extension for the pi coding agent

Package details

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extension

Install pi-wierd-anthropic from npm and Pi will load the resources declared by the package manifest.

npm repohome report
$ pi install npm:pi-wierd-anthropic
Package
pi-wierd-anthropic
Version
0.2.0
Published
May 4, 2026
Downloads
not available
Author
wierdbytes
License
MIT
Types
extension
Size
19.6 KB
Dependencies
0 dependencies · 0 peers
Pi manifest JSON
{
  "extensions": [
    "./index.ts"
  ]
}

Security note

Pi packages can execute code and influence agent behavior. Review the source before installing third-party packages.

README

pi-wierd-anthropic

Claude Pro/Max OAuth extension for the pi coding agent.

Sign in with your Claude Pro or Max account and use it inside pi without an Anthropic API key.

Install

pi install npm:pi-wierd-anthropic

Usage

Start pi, then run:

/login anthropic

and pick Claude Pro/Max. Tokens are stored by pi's auth storage and refreshed automatically.

What it does

  • Registers the anthropic provider with an OAuth login flow that targets claude.ai / platform.claude.com.
  • Reuses pi-ai's built-in Anthropic streamer, which already detects OAuth tokens and applies Claude-Code-compatible headers / betas, the "You are Claude Code, ..." identity block, Claude-Code tool-name mapping and adaptive thinking with output_config.effort for Opus 4.6 / 4.7 and Sonnet 4.6.
  • Layers two Claude-Code-only tweaks on top via the before_provider_request hook: it rewrites Pi-branded paragraphs in the system prompt to Claude Code identity, and prepends the x-anthropic-billing-header system block so Pro/Max billing accepts the request.
  • Reuses pi's built-in Anthropic model registry — no custom model list is injected, so whatever models ship with your pi version are what you get.
  • Creates a ~/.Claude Code → ~/.pi symlink on first load when missing, so tools that look for the Claude Code config directory keep working.

Custom models

To expose an extra Anthropic model, declare it in ~/.pi/agent/models.json the usual pi way. Requests will still authenticate through the OAuth token obtained via /login anthropic.

Troubleshooting

  • Re-run /login anthropic if auth looks stale.
  • If the local callback never completes, paste the final callback URL (or the code#state fragment) when prompted.
  • File issues at https://github.com/wierdbytes/pi-wierd-stuff/issues with your pi version, this extension's version and the error output.

Caveats

Use at your own risk. Driving Claude Pro/Max through a non-official client may go against Anthropic's terms.

Credits

Originally based on pi-anthropic-oauth by Leo Henon. This package is an independent fork maintained inside the pi-wierd-stuff monorepo; bugs here are ours, not the original author's.

License

MIT