opencode.ai/zen/go/v1 incompatible with Raycast AI custom provider #33138

Bug Report

API: https://opencode.ai/zen/go/v1 (used as Raycast custom provider)
Model: mimo-v2.5 (affects all models)

Symptom

Raycast AI returns "Failed to decode the response" with "Coding key: id" on every request.

Root Cause 1: Message format mismatch

Raycast sends:

{"author": "user", "content": {"text": "hello"}}

The Xiaomi backend expects standard OpenAI format:

{"role": "user", "content": "hello"}

This returns 400 - "messages[0] role is not supported" with no id field.

Fix: Convert before forwarding:

for m in body.get("messages", []):
    if "author" in m:
        m["role"] = m.pop("author")
    if isinstance(m.get("content"), dict) and "text" in m["content"]:
        m["content"] = m["content"]["text"]

Root Cause 2: Unsupported tool types

Raycast sends built-in tools with non-standard types:

• {"name": "web_search", "type": "remote_tool"}
• {"name": "location-get-current-location", "type": "local_tool", ...}

The Xiaomi backend rejects with: 400 - "function is not set"

Fix: Strip tools before forwarding:

body.pop("tools", None)
body.pop("tool_choice", None)

Root Cause 3: Error responses missing id field

All 4xx/5xx error responses omit the id field. Raycast's Swift Decodable expects id in every JSON response and crashes when missing.

Fix: Include id in all error responses:

error_response = {
    "id": str(uuid.uuid4()),
    "error": {"code": "400", "message": str(e)}
}