OpenCode Companion

A Noctalia v5 plugin that puts OpenCode on your bar — a glanceable status dot, a native chat panel, session management, and MCP status — all driven by the OpenCode HTTP API. No embedded terminal, no key emulation.

Plugin

Field	Value
ID	weinguyen/opencode-companion
Entries	Bar widget: widget; panels: panel-fill, panel; service: service
Plugin API	3

Built and tested against:

• Noctalia v5.0.0 (97917d9ca07e)
• OpenCode v1.18.13

Requirements

• Noctalia v5 (beta or newer) with plugin_api >= 3 support
• OpenCode installed and available on your PATH (opencode --version to verify)
• A configured OpenCode provider (run opencode once to set up auth)

Install

# Clone the community-plugins repo (if you haven't already)
git clone https://github.com/... community-plugins

# Symlink into Noctalia plugins directory
ln -s "$PWD/community-plugins/opencode-companion" ~/.local/share/noctalia/plugins/opencode-companion

# Enable the plugin
noctalia msg plugins enable weinguyen/opencode-companion

Usage

Adding the widget to your bar

1. Open Noctalia Settings → Bar
2. Click Add Widget
3. Select OpenCode Companion (the code-circle icon)
4. The widget appears on your bar

Opening the panel

• Left click the bar widget → opens/closes the panel
• Right click → quick-create a new session
• Middle click → open current session in terminal (opencode attach)

Panel workflow

When you first open the panel (after a reboot), the session chooser appears. From there you can:

• Create a new session
• Pick an existing session (sorted by most recently updated)
• Filter sessions by workspace (visible in the subtitle)

Once a session is selected, the chat view shows:

• Message history (user + assistant)
• Tool call status cards (if enabled)
• Reasoning text (if enabled)
• Streaming responses as they arrive

Type a prompt in the composer and press Enter or click Send.

IPC

# Toggle the panel (full-height, right side)
noctalia msg panel-toggle weinguyen/opencode-companion:panel-fill

# Toggle the panel (compact, near click)
noctalia msg panel-toggle weinguyen/opencode-companion:panel

# Force refresh
noctalia msg plugin weinguyen/opencode-companion:service all refresh

# Reconnect to server
noctalia msg plugin weinguyen/opencode-companion:service all reconnect

# Create a new session
noctalia msg plugin weinguyen/opencode-companion:service all create_session

Settings

Setting	Type	Default	Description
server_mode	string	"auto"	"auto" manages a local server; "external" connects to a URL
server_host	string	"127.0.0.1"	Hostname the managed server binds to (loopback only)
server_port	double	4096	Port the managed server listens on
server_url	string	""	External server URL (used in "external" mode)
default_workspace	folder	""	Default working directory for new sessions
default_model	string	""	Default model in provider/model format
default_agent	string	"build"	Default agent for new sessions
auto_start	bool	true	Auto-start the managed server
show_tool_calls	bool	true	Show tool call status cards
show_reasoning	bool	false	Show reasoning/thinking text
notify_on_complete	bool	true	Notify when a response completes
max_messages_load	double	50	Max messages to load per session
debug_logging	bool	false	Print debug messages

Session Lifecycle

Within the same boot

• Selecting a session, closing the panel, and reopening it preserves the active session
• Draft text is preserved when the panel closes
• Unread responses are tracked and shown as a badge on the bar widget
• The SSE connection stays alive while the panel is closed

After reboot

• The plugin detects reboot via /proc/sys/kernel/random/boot_id
• After reboot, the session chooser appears instead of auto-opening the last session
• Old sessions are still available to select
• The active session is persisted to ~/.local/state/noctalia/opencode-companion/opencode_state.json

Boot-ID behavior

Condition	Behavior
Boot ID matches saved state	Restore active session on first open
Boot ID differs (reboot)	Show session chooser; keep session list
Saved session no longer exists	Show session chooser

Security Notes

• Loopback only: The managed server binds to 127.0.0.1 by default
• No credential storage: The plugin does not store API keys or tokens
• Shell quoting: All paths and arguments are shell-escaped before command execution
• No auto-approve: Permission requests are never auto-approved
• No secret logging: Passwords and tokens are not written to logs

When running in auto mode without authentication, any local process can reach the managed server. For multi-user systems, consider:

• Setting OPENCODE_SERVER_PASSWORD before starting the server
• Using external mode with a password-protected server

MCP Status

The plugin reads MCP status from OpenCode's /mcp endpoint. To check Context7 and Firecrawl:

curl http://127.0.0.1:4096/mcp | jq

Example response:

{
  "context7": { "status": "connected" },
  "firecrawl": { "status": "connected" },
  "github": { "status": "connected" }
}

Status values: connected, failed, disabled.

The plugin does not add or configure MCP servers — it only reports their status. Configure OpenCode MCP servers through your opencode.json or the TUI.

Troubleshooting

Widget shows offline

# Verify opencode is on PATH
which opencode

# Start a server manually to test
opencode serve --hostname 127.0.0.1 --port 4096 &

# Check health
curl http://127.0.0.1:4096/global/health

Server fails to start

# Check for port conflicts
ss -tlnp | grep 4096

# Try a different port in plugin settings

Panel doesn't open

# Verify plugin is enabled
noctalia msg plugins list

# Try toggling manually
noctalia msg panel-toggle weinguyen/opencode-companion:panel

SSE events not arriving

OpenCode 1.14.42+ had SSE regressions. Upgrade to 1.18.13+ if events stop flowing. The plugin handles reconnection with exponential backoff.

Debug logging

Enable debug_logging in plugin settings, then check Noctalia logs:

journalctl --user -u noctalia -f

Logs

Debug output (when enabled) is prefixed with [opencode-companion]. Look for:

• Connection state changes
• SSE events received
• IPC messages handled
• HTTP request failures

Known Limitations

• No ui.markdown: Responses are rendered as plain ui.label. Code blocks lose syntax highlighting.
• Single-line composer fallback: If multiline input is not fully supported, the composer falls back to single-line.
• Panel layer: Panels render at Layer::Top — notifications and polkit prompts may cover the panel.
• No desktop orb: Initial release includes only the bar widget. A desktop presence orb is planned.
• Boot-ID edge case: If the boot ID file is unreadable, session restoration is skipped.
• SSE reconnection: After server restart, SSE reconnects with backoff (up to 30s delay).
• No model/agent switching mid-session: Model and agent are set at session creation.

Uninstall

# Disable the plugin
noctalia msg plugins disable weinguyen/opencode-companion

# Remove the symlink
rm ~/.local/share/noctalia/plugins/opencode-companion

# Optionally remove saved state
rm -rf ~/.local/state/noctalia/opencode-companion

Roadmap

• Desktop presence orb
• Model/agent switching from header
• Session rename/delete from panel
• MCP status panel
• Multi-workspace profiles
• ui.markdown support when available
• Attachment support (images, files)

License

MIT