OpenCode export flow missing $rename map for mcpServers → mcp

[egonm12]

Bug description

When running opkg install <package> in a workspace with OpenCode detected, the generated .opencode/opencode.json uses the key "mcpServers" instead of "mcp". OpenCode rejects this with:

Configuration is invalid at .opencode/opencode.json
↳ Unrecognized key: "mcpServers"

Steps to reproduce

1. Create a package with a mcp.jsonc:

   {
     "mcpServers": {
       "atlassian": {
         "type": "http",
         "url": "https://mcp.atlassian.com/v1/mcp"
       }
     }
   }

2. Run opkg install <package> in a workspace where OpenCode is detected
3. Inspect .opencode/opencode.json

Actual result:

{
  "mcpServers": {
    "atlassian": {
      "type": "http",
      "url": "https://mcp.atlassian.com/v1/mcp"
    }
  }
}

Expected result:

{
  "mcp": {
    "atlassian": {
      "type": "http",
      "url": "https://mcp.atlassian.com/v1/mcp"
    }
  }
}

Root cause

The OpenCode export flow in platforms.jsonc (lines 816-828) is missing the map transformation to rename mcpServers → mcp:

// Current (line 816-828) — MISSING map
{
  "from": ["mcp.jsonc", "mcp.json"],
  "to": { "$switch": { ... ".opencode/opencode.json" } },
  "merge": "deep"
  // ❌ No map — mcpServers passes through unchanged
}

The Codex platform correctly handles the equivalent rename on line 472:

{ "$rename": { "mcpServers": "mcp_servers" } }

The spec in specs/platforms/flows.md (line 1898) also confirms the inverse rename should exist:

"map": [{ "$rename": { "mcpServers": "mcp" } }]

Suggested fix

Export flow (line 816-828) — add map:

{
  "from": ["mcp.jsonc", "mcp.json"],
  "to": {
    "$switch": {
      "field": "$$targetRoot",
      "cases": [
        { "pattern": "~/", "value": ".config/opencode/opencode.json" }
      ],
      "default": ".opencode/opencode.json"
    }
  },
  "merge": "deep",
  "map": [
    { "$rename": { "mcpServers": "mcp" } }
  ]
}

Import flow (line 884-895) — add reverse map:

{
  "from": {
    "$switch": {
      "field": "$$targetRoot",
      "cases": [
        { "pattern": "~/", "value": ".config/opencode/opencode.json" }
      ],
      "default": ".opencode/opencode.json"
    }
  },
  "to": "mcp.jsonc",
  "map": [
    { "$rename": { "mcp": "mcpServers" } }
  ]
}

Workaround

Users can override via ~/.openpackage/platforms.jsonc or <cwd>/.openpackage/platforms.jsonc with the corrected OpenCode section.

Environment

• opkg version: latest (npm)
• Platform: macOS (darwin)
• Target: OpenCode