Gopher Code

The visual parity validation is organized into several functional areas. Use these categories to identify which parts of the UI require testing or have existing gaps:

• Area 01 (Welcome): Validates the welcome box, including border characters, title formatting, width responsiveness (narrow/wide), mascot art, and dismissal behavior (on keypress or submit).
• Area 02 (Prompt): Validates the input prompt, including character glyphs (e.g., ❯), backspace, history navigation (up/down), and keyboard shortcuts (Ctrl+A, Ctrl+E, Ctrl+C, Ctrl+U, Ctrl+W).
• Area 03 (Streaming): Validates the streaming response experience, including text arrival, code block rendering, spinner glyphs, and cancellation behavior.
• Area 04 (Tools): Validates tool execution UI, such as file reading, error displays, and the use of connector characters (e.g., ⏺ for streaming tools, ✓/✗ for results).
• Area 05 (Permissions): Validates permission dialogs (e.g., Bash dialogs) and the visibility of results.
• Area 06 (Status): Validates the status line, including idle shortcuts and streaming interrupt indicators.
• Area 07 (Commands): Validates slash commands (e.g., /model, /clear, /help).
• Area 09 (Thinking): Validates the display of model thinking effort.
• Area 11 (Layout): Validates layout elements like dividers and double dividers.
• Area 12 (Diff): Validates the diff preview dialog, including content rendering and approval/rejection controls.
• Area 20 (Multiturn): Validates message ordering and prefixing in multi-turn conversations.

The BridgeOrchestrator follows a specific lifecycle to ensure reliable operation and clean resource management:

1. Registration: Upon Start(), the orchestrator calls API.RegisterBridgeEnvironment to obtain an EnvironmentID and EnvironmentSecret.
2. Polling Loop: The orchestrator enters a loop calling API.PollForWork.
   • If no work is found, it sleeps based on the PollConfig.
   • If work is found, it dispatches it.
3. Work Dispatching:
   • Healthchecks: Acknowledged immediately.
   • Sessions: The orchestrator validates the session ID, decodes the secret, checks against MaxSessions capacity, acknowledges the work to the server, and uses the Spawner to launch the session.
4. Session Monitoring: Each spawned session is watched in a background goroutine. When a session completes (Success, Failure, or Interrupted), the orchestrator cleans up local state and notifies the server via API.StopWork (unless the session was interrupted by the server).
5. Shutdown: When Stop() is called or a fatal error occurs, the orchestrator kills all active sessions (SIGTERM $\rightarrow$ SIGKILL), stops all work on the server, and finally deregisters the environment.

The RemoteIO struct is a bidirectional stream-JSON I/O wrapper designed for remote sessions (such as bridge or CCR connections). It abstracts the underlying network transport, allowing a developer to treat a remote connection as a standard io.Reader for incoming data and a Write method for outgoing messages.

Key Responsibilities:

• Transport Abstraction: Supports two versions: TransportV1 (WebSocket) and TransportV2 (SSE + POST/CCR v2).
• Authentication: Automatically manages Authorization: Bearer <token> headers using a provided TokenSource and includes the x-environment-runner-version header.
• Keep-Alive: If running in a bridge environment (detected via CLAUDE_CODE_ENVIRONMENT_KIND), it automatically sends keep_alive messages at a configured interval.
• Data Framing: Ensures incoming data is framed with trailing newlines for NDJSON consumption via the Reader() method.

// Example conceptual usage
cfg := cli.RemoteIOConfig{
    StreamURL: "wss://example.com/session",
    SessionID: "session-123",
    TokenSource: func() string { return "my-token" },
    TransportFactory: myTransportFactory,
    PollConfig: bridge.PollIntervalConfig{SessionKeepaliveInterval: 30 * time.Second},
}

rio, _ := cli.NewRemoteIO(cfg)
rio.Connect()

// Read incoming NDJSON lines
scanner := bufio.NewScanner(rio.Reader())
for scanner.Scan() {
    fmt.Println("Received:", scanner.Text())
}

// Send a message
rio.Write(map[string]string{"type": "command", "payload": "hello"})

The StructuredIO system implements a line-delimited JSON (NDJSON) protocol for communication between an SDK host and a client (like Claude Code) via stdin and stdout.

Communication Flow

1. Inbound (stdin): The system parses StdinMessage objects. These can be user/assistant/system messages or control_request messages from the host.
2. Outbound (stdout): The system writes StdoutMessage (NDJSON lines) to the output stream. This includes responses to requests or new control requests (like permission prompts).

Message Types (StdinMessage.Type)

• user: A message from the user.
• assistant: A message from the assistant.
• system: A system instruction.
• control_request: A command or request from the host (e.g., asking for permission).
• control_response: A response to a previously sent control_request.
• keep_alive: A heartbeat message (silently ignored).
• update_environment_variables: A request to update environment state (currently not implemented in Go).