Scarf

A native macOS companion app for the Hermes AI agent.
Full visibility into what Hermes is doing, when, and what it creates.

Features

• Dashboard — System health, token usage, cost tracking, recent sessions at a glance
• Sessions Browser — Full conversation history with message rendering, tool call inspection, and full-text search (FTS5)
• Activity Feed — Recent tool execution log with filtering by kind (read/edit/execute/fetch/browser) and detail inspector
• Live Chat — Embedded terminal running hermes chat with full ANSI color and Rich formatting via SwiftTerm
• Memory Viewer/Editor — View and edit Hermes's MEMORY.md and USER.md with live refresh
• Skills Browser — Browse all installed skills by category with file content viewer
• Cron Manager — View scheduled jobs, their status, prompts, and output
• Log Viewer — Real-time tailing of error and gateway logs with level filtering
• Settings — Read-only config display with raw YAML viewer and Finder path links
• Menu Bar — Status icon showing Hermes running state with quick actions

Requirements

• macOS 26.2+
• Xcode 26.3+
• Hermes agent installed at ~/.hermes/

Building

git clone https://github.com/awizemann/scarf.git
cd scarf/scarf
open scarf.xcodeproj

Or from the command line:

xcodebuild -project scarf/scarf.xcodeproj -scheme scarf -configuration Debug build

Architecture

Scarf follows the MVVM-Feature pattern with zero external dependencies beyond SwiftTerm:

scarf/
  Core/
    Models/       Plain data structs (HermesSession, HermesMessage, HermesConfig, etc.)
    Services/     Data access (SQLite reader, file I/O, log tailing, file watcher)
  Features/       Self-contained feature modules
    Dashboard/    System overview and stats
    Sessions/     Conversation browser with detail view
    Activity/     Tool execution feed with inspector
    Chat/         Embedded terminal via SwiftTerm
    Memory/       Memory viewer and editor
    Skills/       Skill browser by category
    Cron/         Scheduled job viewer
    Logs/         Real-time log viewer
    Settings/     Configuration display
  Navigation/     AppCoordinator + SidebarView

Data Sources

Scarf reads Hermes data directly from ~/.hermes/:

Source	Format	Access
state.db	SQLite (WAL mode)	Read-only
config.yaml	YAML	Read-only
memories/*.md	Markdown	Read/Write
cron/jobs.json	JSON	Read-only
logs/*.log	Text	Read-only
gateway_state.json	JSON	Read-only
skills/	Directory tree	Read-only
hermes chat	Terminal subprocess	Interactive

The app never writes to state.db — it opens in read-only mode to avoid WAL contention with Hermes.

Dependencies

Package	Purpose
SwiftTerm	Terminal emulator for the Chat feature

Everything else uses system frameworks: SQLite3 C API, Foundation JSON, AttributedString markdown, GCD file watching.

How It Works

Scarf is a passive observer. It watches ~/.hermes/ for file changes and polls the SQLite database for new sessions and messages. The Chat tab spawns hermes chat as a subprocess in a pseudo-terminal, giving you the full interactive Hermes CLI experience with proper ANSI rendering.

The app sandbox is disabled because Scarf needs direct access to ~/.hermes/ and the ability to spawn the Hermes binary.

Contributing

Contributions are welcome. Please open an issue to discuss what you'd like to change before submitting a PR.

1. Fork the repo
2. Create your feature branch (git checkout -b feature/my-feature)
3. Commit your changes (git commit -m 'Add my feature')
4. Push to the branch (git push origin feature/my-feature)
5. Open a Pull Request

License

MIT