opencode2: MCP servers from config not recognized (No MCP servers configured) #37532

Summary

opencode2 (next) reports "No MCP servers configured" despite having MCP servers defined in ~/.config/opencode/opencode.json, indicating the mcp config section is not being read.

Environment

• opencode version: 0.0.0-next-15747 (next channel)
• OS: Linux 6.17.0-1018-oracle aarch64 (Ubuntu 24.04)
• Terminal: TERM_PROGRAM=tmux, TERM=tmux-256color
• Shell: /bin/bash
• Install/channel: next (via volta)
• Active plugins: superpowers, oh-my-openagent

Reproduction

1. Configure MCP servers in ~/.config/opencode/opencode.json:

   {
     "mcp": {
       "servers": {
         "serena": {
           "type": "local",
           "command": ["uvx", "--from", "git+https://github.com/oraios/serena", "serena", "start-mcp-server"]
         },
         "gh-grep": {
           "type": "remote",
           "url": "https://mcp.grep.app"
         }
       }
     }
   }

2. Run: opencode2 mcp list

Expected Behavior

The configured MCP servers should be listed with their status.

Actual Behavior

No MCP servers configured

Additional Context

• The same config works with opencode v1 (1.17.18) — opencode mcp list (not tested but config structure is same).
• Related to opencode2: Model unavailable error for OpenAI-compatible provider despite working API #37531 — both issues involve opencode2 not reading config sections (providers, mcp, permissions, agents, plugins).