dirge plugin: register OpenCode Zen & Go providers (OpenAI + Anthropic endpoints)

opencode.janet

# OpenCode provider registration (P1)
#
# Registers OpenAI-compatible and Anthropic-compatible endpoints for
# OpenCode's two model namespaces:
#
#   Zen   — curated models (Claude, GPT, Gemini, DeepSeek, Qwen, etc.)
#   Go    — low-cost subscription for open coding models
#
# Both use the same OPENCODE_API_KEY.
#
# Usage
# -----
#   1. Get an API key from https://opencode.ai (Zen → API keys)
#   2. Optionally subscribe to Go for open-model access
#   3. Set OPENCODE_API_KEY in your environment (or use a .env loader)
#   4. Restart dirge; the providers below are auto-loaded
#   5. /model opencode-zen/claude-sonnet-4-6
#      /model opencode-go/glm-5.2
#      etc.
#
# To see the full model catalogue:
#   https://opencode.ai/docs/zen/#models
#   https://opencode.ai/docs/go/#models
#
# Or curl (requires a key with active credits):
#   curl -H "Authorization: Bearer $OPENCODE_API_KEY" \
#        https://opencode.ai/zen/v1/models | jq .
#
# Not supported in this plugin
# ----------------------------
# - GPT models using OpenAI's /v1/responses endpoint (different
#   protocol from /v1/chat/completions — rig has no Responses API
#   client). Use openrouter/gpt-5.5 as a fallback.
# - Gemini models (OpenCode's Gemini endpoint structure differs from
#   what rig's gemini provider expects under `base_url`).
#
# Provider table
# --------------
# | /model prefix                 | protocol   | base URL                                              |
# |-------------------------------|------------|-------------------------------------------------------|
# | opencode-zen                  | openai     | https://opencode.ai/zen/v1                            |
# | opencode-zen-anthropic        | anthropic  | https://opencode.ai/zen/v1                            |
# | opencode-go                   | openai     | https://opencode.ai/zen/go/v1                         |
# | opencode-go-anthropic         | anthropic  | https://opencode.ai/zen/go/v1                         |

(var env "OPENCODE_API_KEY")

# --- Zen: OpenAI-compatible ---
# DeepSeek, MiniMax, GLM, Kimi, Grok, Big Pickle, MiMo, North, Nemotron
(harness/register-provider
  "opencode-zen"
  "openai"
  "https://opencode.ai/zen/v1"
  env)

# --- Zen: Anthropic-compatible ---
# Claude (Fable, Opus, Sonnet, Haiku), Qwen
(harness/register-provider
  "opencode-zen-anthropic"
  "anthropic"
  "https://opencode.ai/zen/v1"
  env)

# --- Go: OpenAI-compatible ---
# GLM, Kimi, DeepSeek, MiMo, MiniMax M3
(harness/register-provider
  "opencode-go"
  "openai"
  "https://opencode.ai/zen/go/v1"
  env)

# --- Go: Anthropic-compatible ---
# MiniMax M2.7/M2.5, Qwen
(harness/register-provider
  "opencode-go-anthropic"
  "anthropic"
  "https://opencode.ai/zen/go/v1"
  env)

(defn opencode-models-handler
  "Slash command: print OpenCode model quick-reference."
  [arg-string]
  (string
    "OpenCode providers registered. Select a model with:\n"
    "\n"
    "  /model opencode-zen/<model-id>\n"
    "  /model opencode-zen-anthropic/<model-id>\n"
    "  /model opencode-go/<model-id>\n"
    "  /model opencode-go-anthropic/<model-id>\n"
    "\n"
    "Zen — OpenAI-compatible models:\n"
    "  deepseek-v4-pro, deepseek-v4-flash, minimax-m2.7, minimax-m2.5,\n"
    "  glm-5.2, glm-5.1, glm-5, kimi-k2.5, kimi-k2.6,\n"
    "  grok-build-0.1, big-pickle,\n"
    "  mimo-v2.5-free, north-mini-code-free, nemotron-3-ultra-free,\n"
    "  deepseek-v4-flash-free\n"
    "\n"
    "Zen — Anthropic-compatible models:\n"
    "  claude-fable-5, claude-opus-4-8, claude-opus-4-7, claude-opus-4-6,\n"
    "  claude-opus-4-5, claude-opus-4-1,\n"
    "  claude-sonnet-4-6, claude-sonnet-4-5, claude-sonnet-4,\n"
    "  claude-haiku-4-5, claude-3-5-haiku,\n"
    "  qwen3.7-max, qwen3.7-plus, qwen3.6-plus, qwen3.5-plus\n"
    "\n"
    "Go — OpenAI-compatible models:\n"
    "  glm-5.2, glm-5.1, kimi-k2.7-code, kimi-k2.6,\n"
    "  deepseek-v4-pro, deepseek-v4-flash,\n"
    "  mimo-v2.5, mimo-v2.5-pro, minimax-m3\n"
    "\n"
    "Go — Anthropic-compatible models:\n"
    "  minimax-m2.7, minimax-m2.5,\n"
    "  qwen3.7-max, qwen3.7-plus, qwen3.6-plus\n"
    "\n"
    "Full catalogue: https://opencode.ai/docs/zen/#models\n"
    "Go models:      https://opencode.ai/docs/go/#models\n"
    "\n"
    "Not supported (different API protocol):\n"
    "  GPT 5.x models (OpenAI Responses API)\n"
    "  Gemini models (endpoint structure mismatch)"))

(harness/register-command "opencode-models" "opencode-models-handler")