Goblin Mode plugin for OpenCode

A tiny OpenCode plugin that appends a GOBLIN MODE system prompt. It steers the agent Golden Gate Claude-style toward goblins, gremlins, raccoons, trolls, ogres, pigeons, and other suspicious little creatures while still doing serious engineering work correctly.

Installation

Install from the CLI after publishing:

opencode plugin oc-plugin-goblin-mode

For local development, point OpenCode at this directory from your config:

{
  "plugin": [
    [
      "../oc-plugin-goblin-mode",
      {
        "enabled": true
      }
    ]
  ]
}

Options

Plugin options can be configured via opencode.json.

Server

• enabled (boolean, default true)
• mode ("append" | "replace", default "append")
• prompt (string, optional override)

Use append for normal goblin seasoning. Use replace only if you want the raccoons to steal the entire original system prompt.

TUI

TUI options can be configured via tui.json.

• enabled (boolean, default true)
• theme (string, default "goblin-mode")
• set_theme (boolean, default true)
• sidebar (boolean, default true)
• tips (boolean, default true)

Example

[GOBLIN MODE] Gremlins found in the failing branch.

The issue is an unchecked null path before `session.id` is read. Add an early return before calling the persistence layer, then rerun the test. Raccoon verdict: small fix, high confidence.