muse-cc — Muse Code subscription proxy

Local reverse proxy that lets Claude Code (and any OpenAI/Codex-compatible
client) use Meta's muse-spark models through a Muse Code subscription.
No ZEN_API_KEY, no Zen billing — the only upstream is https://api.meta.ai,
authenticated with the muse login credential.

What	Where
Port	:8788 (never :8787 — that is opencode-cc)
Binary	~/.local/bin/muse-cc
systemd unit	~/.config/systemd/user/muse-cc.service
Env file	~/.config/muse-cc/env (mode 600)
Data dir	~/.local/share/muse-cc
Go proxy + embedded dashboard	this repo (main.go, internal/, web/)

1. Overview

muse-cc accepts the same three API surfaces clients already speak and serves
them from Meta, natively on every surface (all verified live with 200s):

• POST /v1/messages — Anthropic Messages API → Meta /v1/messages
  passthrough (content blocks, thinking, tool_use/tool_result,
  stop_reason preserved byte-for-byte).
• POST /v1/chat/completions — OpenAI Chat Completions passthrough.
• POST /v1/responses — Codex Responses API passthrough (Meta's recommended
  full-featured surface: reasoning replay, tool loops, search grounding).
• GET /v1/models — live upstream list, 60 s TTL cache, static fallback.
• GET /api/* + / — JSON control API and the embedded React panel.

Non-Meta targets configured via the upstream pool still use the translation
paths (Messages↔Chat, Responses↔Chat, Responses↔Messages bridge); the
Anthropic↔Responses bridge also remains as the fallback when native routing
is disabled.

2. Quick start

# 1. Log the Muse CLI in (one time; creates ~/.config/muse/auth.json).
muse login

# 2. Run the proxy. No key export needed: it auto-syncs the login credential.
muse-cc -data ~/.local/share/muse-cc   # listens on :8788

# 3. Point Claude Code at it.
export ANTHROPIC_BASE_URL=http://localhost:8788
export ANTHROPIC_AUTH_TOKEN=anything
claude

Claude Code's default claude-* model ids are mapped to
muse-spark-1.3-contributor automatically; explicit muse-* ids pass
through verbatim. Prefer an explicit model? export ANTHROPIC_MODEL=muse-spark-1.3.

Heads-up: if your ~/.claude/settings.json pins env.ANTHROPIC_BASE_URL
(e.g. to another proxy), that wins over shell exports — use the
claude-muse launcher (§10) instead, which overri