Opencode Claude Auth
Description
OpenCode plugin that uses your existing Claude Code credentials — no separate login needed.
Installation
This entry records only its repository, not the path inside it, so there is no
exact command to give. Open the source below and copy the folder into
~/.claude/skills/, or the file into ~/.claude/agents/.
README
opencode-claude-auth
[](https://www.npmjs.com/package/opencode-claude-auth) [](https://github.com/griffinmartin/opencode-claude-auth/actions/workflows/ci.yml) [](https://socket.dev/npm/package/opencode-claude-auth)
Self-contained Anthropic auth provider for OpenCode using your Claude Code credentials — no separate login or API key needed.
How it works
The plugin registers its own auth provider with a custom fetch handler that intercepts all Anthropic API requests. It reads OAuth tokens from the macOS Keychain (or `~/.claude/.credentials.json` on other platforms), caches them in memory with a 30-second TTL, and handles the full request lifecycle — no builtin Anthropic auth plugin required. On macOS, multiple Claude Code accounts are detected automatically and can be switched via `opencode auth login`.
It also syncs credentials to OpenCode's `auth.json` as a fallback (on Windows, it writes to both `%USERPROFILE%\.local\share\opencode\auth.json` and `%LOCALAPPDATA%\opencode\auth.json` to cover all installation methods). If a token is near expiry, it refreshes directly via Anthropic's OAuth endpoint (zero LLM tokens consumed), falling back to the Claude CLI if the direct refresh fails. Background re-sync runs every 5 minutes.
Prerequisites
- Claude Code installed and authenticated (run
claudeat least once) - OpenCode installed
macOS is preferred (uses Keychain). Linux and Windows work via the credentials file fallback.
Installation
**For Humans**
**Option A: Let an LLM do it**
Paste this into any LLM agent (Claude Code, OpenCode, Cursor, etc.):
Install the opencode-claude-auth plugin and configure it by following: https://raw.githubusercontent.com/griffinmartin/opencode-claude-auth/main/installation.md**Opti
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