Claude Desktop × Muse Spark 1.3 via OpenCode Go

Run Muse Spark 1.3 Contributor (and any OpenCode Go model) inside Claude Desktop on macOS via a local translation proxy — no Claude Pro plan needed.

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🇬🇧 English — How This System Works

Overview

This repo documents the exact setup we built to run Muse Spark 1.3 Contributor (free under OpenCode Go Contributor program) inside Claude Desktop on macOS — the same UI you use for Claude Pro, but backed by a custom inferenceGateway.

Claude Desktop does not support custom models natively. On macOS it runs in 3P (third-party) mode via files under ~/Library/Application Support/Claude-3p/configLibrary/. We front it with a tiny Node proxy (~/.claude-go/proxy.mjs) that translates Anthropic → OpenAI and handles the special case of Muse Spark.

┌─────────────────┐      Anthropic API       ┌──────────────────┐      OpenAI API (translated)      ┌─────────────────────────────┐
│ Claude Desktop  │  ─────────────────────►  │  proxy.mjs       │  ─────────────────────────────►  │  opencode.ai/zen/go/v1      │
│ (3P Gateway)    │  http://127.0.0.1:8765   │  127.0.0.1:8765    │  /responses (Muse Spark)         │  Muse Spark 1.3 Contributor │
│ 3P mode         │  ◄─────────────────────  │  (Node)          │  ◄─────────────────────────────  │  DeepSeek / GLM / Kimi ...  │
└─────────────────┘                          └──────────────────┘                                  └─────────────────────────────┘
         ▲                                            │                                                     │
         │ MCP (stdio)                                │ CLAUDE_GO_KEY                                         │ Bearer sk-... (Go subscription)
         │ npx -y opencode-mcp                        │ sk-...