Signal Desktop Skill

Overview

Quick Install

curl -sSL https://canifi.com/skills/signal-desktop/install.sh | bash

cp -r skills/signal-desktop ~/.canifi/skills/

Setup

# First, ensure canifi-env is installed:
# curl -sSL https://canifi.com/install.sh | bash

canifi-env set SIGNAL_LINKED "true"
canifi-env set SIGNAL_APP_PATH "/Applications/Signal.app"

Privacy & Authentication

Option 1: Manual Browser Login (Recommended)

1. Complete the Browser Automation Setup using CDP mode
2. Login to the service manually in the Playwright-controlled Chrome window
3. Claude will use your authenticated session without ever seeing your password

Option 2: Environment Variables

canifi-env set SERVICE_EMAIL "your-email"
canifi-env set SERVICE_PASSWORD "your-password"

Capabilities

• Send and receive encrypted messages
• Create and manage groups
• Share encrypted media files
• Search message history
• Manage disappearing messages
• Handle note to self
• Manage blocked contacts
• Configure privacy settings

Usage Examples

Example 1: Send an Encrypted Message

User: "Send a Signal message to James about the confidential project"
Claude: I'll send that secure message via Signal.
- Launch Signal Desktop application
- Search for James in contacts
- Open conversation
- Type and send message
- Confirm delivery (checkmarks)

Example 2: Create a Secure Group

User: "Create a Signal group called 'Secure Team' with Ana and Carlos"
Claude: I'll create that encrypted group.
- Open Signal Desktop
- Start new group
- Add Ana and Carlos
- Name group "Secure Team"
- Confirm group created with encryption

Example 3: Enable Disappearing Messages

User: "Set disappearing messages to 1 week for my chat with Alex"
Claude: I'll configure disappearing messages.
- Open chat with Alex
- Access conversation settings
- Enable disappearing messages
- Set timer to 1 week
- Confirm setting applied

Example 4: Search Secure Messages

User: "Find all Signal messages mentioning 'contract'"
Claude: I'll search your Signal messages.
- Open Signal search
- Search for "contract"
- Collect matching messages
- Present results with context (maintaining privacy)

Authentication Flow

1. Launch Signal Desktop via system command
2. If not linked, show QR code for phone scanning
3. Notify user via iMessage to scan QR with Signal mobile
4. Wait for device linking confirmation
5. Verify contact list access
6. Maintain linked status for future sessions

Error Handling

• App Not Found: Verify Signal Desktop installation path
• Not Linked: Prompt user to link via QR code scanning
• Session Expired: Re-link device through phone app
• Contact Not Found: Search by phone number format variations
• Group Creation Failed: Check contact permissions
• Media Failed: Verify file format and size limits
• Connection Lost: Wait for Signal servers reconnection
• Rate Limited: Implement backoff for message sending

Self-Improvement Instructions

1. Document desktop app UI changes
2. Add support for new message features
3. Log group management patterns
4. Update for new privacy features

Notes

• Signal Desktop requires linking to mobile app
• All messages remain end-to-end encrypted
• Desktop app must remain open for real-time messaging
• Some features require both parties to update
• Group video calls not automatable
• Safety numbers should be verified manually
• Registration lock may require PIN