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@thehugeman/opencode-anthropic-auth-community

v0.0.3

Published

> Community-maintained Anthropic Claude Pro/Max OAuth plugin for [opencode](https://github.com/anomalyco/opencode).

Vulnerabilities

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Links

Git

Maintainers

thehugemanthehugeman

Keywords

opencodeanthropicclaudeoauthplugin

Readme

opencode-anthropic-auth-community

Community-maintained Anthropic Claude Pro/Max OAuth plugin for opencode.

The official opencode-anthropic-auth package was removed from npm following a legal request from Anthropic. This is a community fork to keep the functionality alive.

Disclaimer: Using this plugin may violate Anthropic's Terms of Service. Use at your own risk.

Installation

Add the plugin to your opencode.json:

{
  "plugin": ["@thehugeman/opencode-anthropic-auth-community@latest"]
}

That's it. No custom binary, no fork of opencode — works with the standard installed opencode CLI.

Usage

  1. Run opencode
  2. Go to Providers → Login → Anthropic
  3. Select Claude Pro/Max
  4. A browser URL will open — authorize it, then paste the code back into the terminal
  5. Done — your Claude Pro/Max subscription is now used by opencode at no extra API cost

Optional: Full system prompt

If you're on opencode >= 1.2.27, you can add the original Anthropic session prompt by creating an anthropic-prompt.txt file in your opencode plugins directory:

~/.config/opencode/plugins/anthropic-prompt.txt

Contents from the original prompt.

How it works

The plugin intercepts Anthropic API requests and:

  • Handles OAuth PKCE flow via claude.ai
  • Injects the required oauth-2025-04-20 beta header
  • Handles token refresh automatically
  • Prefixes tool names with mcp_ (required by the OAuth API path)
  • Strips the prefix back from streaming responses
  • Computes the required billing header

Contributing

PRs welcome. If the plugin breaks (Anthropic can change their OAuth flow at any time), open an issue or submit a fix.

License

MIT