Kimi rejects tool properties without explicit types

Description

Kimi through Console Go rejects MCP tool schemas when a property uses enum, const, or structural keywords but omits an explicit type. OpenCode currently forwards those otherwise valid JSON Schema nodes unchanged, so the request fails before the model can run:

tools.function.parameters is not a valid moonshot flavored json schema, details: <At path 'properties.view': type is not defined>

Plugins

A custom MCP server whose tool schema contains a property such as view: { enum: ["text", "raw"] }.

OpenCode version

1.18.8 (the same Moonshot sanitizer is present on current dev)

Steps to reproduce

1. Configure a Kimi model through Console Go.
2. Connect an MCP tool with parameters: { type: "object", properties: { view: { enum: ["text", "raw"] } } }.
3. Send a prompt with tools enabled.
4. The provider rejects the request before any tool call.

Screenshot and/or share link

No response

Operating System

Ubuntu 22.04

Terminal

Headless API server