opencode-plugin-shell-env

Loads .opencode/.env variables into OpenCode's shell environment and MCP server processes.

Problem

OpenCode's opencode.json supports environment variable references like {env:N8N_MCP_BEARER_TOKEN}, but these only resolve OS-level environment variables (i.e., variables exported in the shell). An .opencode/.env file is not read by default.

Solution

This plugin hooks into OpenCode's shell.env lifecycle event and injects variables from <projectRoot>/.opencode/.env into every shell command and MCP server process spawned by OpenCode.

Behavior

• Reads <projectRoot>/.opencode/.env on every shell invocation
• Does NOT overwrite variables already present in the environment
• Silently skips if .opencode/.env is missing or unreadable
• Parses standard .env syntax

Supported .env Syntax

# Comments (lines starting with #)
KEY=VALUE
KEY="quoted value"
KEY='single quoted value'
export KEY=VALUE          # Optional export prefix
KEY=value # inline comment

Installation

Add the plugin to your .opencode/package.json:

{
  "dependencies": {
    "@techdivision/opencode-plugin-shell-env": "github:techdivision/opencode-plugin-shell-env"
  }
}

Then install and link:

cd .opencode && npm install
npx opencode-link shell-env

Contents

| Name | Type | Description | |------|------|-------------| | shell-env.ts | Plugin | Hooks into shell.env lifecycle to inject .opencode/.env variables |

Example: n8n MCP Server with .env

.opencode/.env:

N8N_MCP_BEARER_TOKEN=n8n_api_abc123

.opencode/opencode.json:

{
  "$schema": "https://opencode.ai/config.json",
  "instructions": [
    "guideline/*.md"
  ],
  "mcp": {
    "n8n-mcp": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "mcp-remote",
        "https://n8n.example.com/mcp-server/http",
        "--header",
        "Authorization: ${N8N_MCP_BEARER_TOKEN}"
      ],
      "environment": {
        "N8N_MCP_BEARER_TOKEN": "Bearer {env:N8N_MCP_BEARER_TOKEN}"
      }
    }
  }
}

Without the shell-env plugin, {env:N8N_MCP_BEARER_TOKEN} would only resolve if the variable is exported in the shell (export N8N_MCP_BEARER_TOKEN=...). With the plugin, it resolves from .opencode/.env automatically.

License

MIT