opencode-messages

Installable OpenCode plugin package for controlling a running OpenCode instance from your iPhone over iMessage using Messages.dev.

The package exports OpencodeMessagesPlugin and is designed so users can configure everything directly in opencode.json.

If you provide a public tunnel URL, the plugin will create or reuse the Messages.dev webhook automatically. That removes the manual webhook setup step entirely.

It:

• receives message.received webhooks from Messages.dev
• verifies the webhook signature
• maps each allowed sender to an OpenCode session
• sends prompts, slash commands, shell commands, and permission replies into OpenCode
• sends the resulting assistant response back over iMessage

What It Supports

• normal prompt messages
• /new [title]
• /use <session-id>
• /status
• /abort
• /cmd </slash-command args>
• /shell <command>
• /approve <permission-id>
• /deny <permission-id>

Quick Start

1. Install the package:

npm install opencode-messages

2. Put this in opencode.json:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": [["opencode-messages", {
    "apiKey": "sk_live_...",
    "line": "+15551234567",
    "publicUrl": "https://paste-your-tunnel-url-here.trycloudflare.com",
    "allowedSenders": ["+15559876543"]
  }]]
}

3. Start OpenCode in the project.
4. Expose the local bridge over HTTPS:

cloudflared tunnel --url http://127.0.0.1:8787

5. Replace publicUrl in opencode.json with the tunnel URL that cloudflared printed.
6. Restart OpenCode if it was already running.
7. Send /help from your iPhone.

No manual Messages.dev webhook creation is needed in this mode.

Install

Published package usage in opencode.json:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": [["opencode-messages", {
    "apiKey": "sk_live_...",
    "line": "+15551234567",
    "publicUrl": "https://your-tunnel-url.trycloudflare.com",
    "allowedSenders": ["+15559876543"]
  }]]
}

That is the lowest-friction setup path because users already need this file for the plugin entry.

Manual Setup

You can also use environment variables instead of opencode.json:

export OPENCODE_MESSAGES_API_KEY="sk_live_..."
export OPENCODE_MESSAGES_LINE="+15551234567"
export OPENCODE_MESSAGES_PUBLIC_URL="https://your-tunnel-url.trycloudflare.com"
export OPENCODE_MESSAGES_ALLOWED_SENDERS="+15559876543"

If you do not want the plugin to auto-manage the webhook, you can still configure a webhook yourself and provide a secret manually:

export OPENCODE_MESSAGES_WEBHOOK_SECRET="whsec_..."

Optional overrides:

export OPENCODE_MESSAGES_HOST="127.0.0.1"
export OPENCODE_MESSAGES_PORT="8787"
export OPENCODE_MESSAGES_WEBHOOK_PATH="/opencode-messages/webhook"
export OPENCODE_MESSAGES_STATE_FILE=".opencode/opencode-messages-state.json"
export OPENCODE_MESSAGES_MAX_CHUNK_CHARS="1800"

Package Layout

• index.ts: source for the package plugin entrypoint
• dist/index.js: built plugin entrypoint published to npm
• .opencode/plugins/opencode-messages.ts: local development wrapper that re-exports the package plugin

Notes

• The plugin reads its config from the plugin tuple options in opencode.json, and environment variables override file values when both are present.
• The plugin accepts both the new OPENCODE_MESSAGES_* variables and the older OPENCODE_MESSAGES_DEV_* names for compatibility.
• publicUrl is the preferred setup path. When present, the plugin creates or reuses the Messages.dev webhook automatically.
• The plugin only accepts senders listed in allowedSenders or OPENCODE_MESSAGES_ALLOWED_SENDERS.
• If you do not want secrets in opencode.json, use environment variables instead.
• State is persisted in .opencode/opencode-messages-state.json so sender-to-session mappings survive restarts.
• Permission prompts from OpenCode are sent back to iMessage, and you can reply with /approve <id> or /deny <id>.
• Incoming webhooks must reach the machine running OpenCode. Messages.dev requires an HTTPS endpoint for webhook delivery.

Health Check

The plugin exposes a local health endpoint:

GET /health

Example:

curl http://127.0.0.1:8787/health