Anthropic OAuth Fix for OpenCode

Fixes the rate limit (429) and "out of extra usage" / "no credit" errors when using Claude Pro/Max subscription models (Sonnet, Opus, Haiku) in opencode.

OAuth Login

After installing, restart opencode → /connect → Claude Pro/Max → authorize in browser → paste the code.

Install

curl -sL https://raw.githubusercontent.com/vinzabe/opencode-anthropic-max-fix/master/install.cjs | node

What it does

1. Installs the correct op-anthropic-auth@0.1.1 plugin with OAuth billing-header support, into both opencode plugin layouts (~/.cache/opencode/node_modules/... and ~/.cache/opencode/packages/<spec>/...)
2. Pins the plugin in ~/.config/opencode/opencode.json
3. Sets up a per-platform watcher that restores the plugin if opencode overwrites it via bun install
   • Linux: systemd path + service user units
   • macOS: launchd agent with WatchPaths (kqueue NOTE_WRITE)

Requirements

• Node.js
• macOS or Linux
• Claude Max or Pro subscription

Reverting

# Linux
systemctl --user disable --now opencode-anthropic-patch.path opencode-anthropic-patch.service
rm ~/.config/systemd/user/opencode-anthropic-patch.{service,path}

# macOS
launchctl unload ~/Library/LaunchAgents/com.vinzabe.opencode-anthropic-patch.plist
rm ~/Library/LaunchAgents/com.vinzabe.opencode-anthropic-patch.plist

Without the watcher (one-shot)

curl -sL https://raw.githubusercontent.com/vinzabe/opencode-anthropic-max-fix/master/install.cjs | node -- --no-watcher