▸ Agent Skills
6 min read

Control Herdr terminal multiplexer, manage workspaces, tabs, and panes, coordinate coding agents, or guide humans on installing, configuring, and troubleshooting Herdr. Use when working inside Herdr (HERDR_ENV=1), orchestrating agent terminal sessions, or assisting users with Herdr concepts, setup, and keybindings.

Herdr

Herdr is a mouse-first, agent-aware terminal multiplexer and workspace manager designed for AI coding workflows. Like tmux, a persistent background server manages real terminal processes across workspaces, tabs, and panes. Unlike tmux, Herdr features a clickable UI, native agent state detection, and a scriptable CLI / socket API.

This skill serves two distinct roles:

  1. Operating Herdr (Agent CLI Control): When running inside a Herdr pane (HERDR_ENV=1), control panes, spawn sub-agents, run commands in background panes, and inspect outputs without stealing user focus.
  2. Guiding Humans (Setup & Troubleshooting): Help users install, configure, understand, and troubleshoot Herdr sessions on their local machine.

Progressive Disclosure & Reference Resources

Role 1: Operating Herdr from Inside a Pane

Environment Verification

Before executing any control commands, confirm that the agent is running inside a Herdr-managed pane:

test "${HERDR_ENV:-}" = 1

If this check fails, notify the user that you are not running inside Herdr and stop. Do not attempt to inspect or control external Herdr sessions.

Discover CLI Syntax

The installed herdr binary is the source of truth for command syntax:

herdr --help

Print specific command group help by running the group name:

herdr agent
herdr pane
herdr workspace
herdr tab
herdr worktree
herdr terminal
herdr notification
herdr integration
herdr session

[!WARNING] Do NOT run bare herdr for command discovery; it launches or attaches the interactive TUI. Do not omit required arguments on mutating commands (such as herdr workspace create), as they execute with default parameters.

IDs and Caller Context

Public IDs are opaque, stable handles:

  • Workspace: w1
  • Tab: w1:t1
  • Pane: w1:p1

Herdr injects caller context environment variables into every managed pane:

printf '%s\n' "$HERDR_WORKSPACE_ID" "$HERDR_TAB_ID" "$HERDR_PANE_ID"

Inspect active state:

herdr workspace list
herdr tab list --workspace "$HERDR_WORKSPACE_ID"
herdr pane current --current
herdr pane list --workspace "$HERDR_WORKSPACE_ID"
herdr agent list

Starting and Coordinating Agents

Default to creating a sibling pane in the current tab and directory without stealing focus:

  1. Split Pane: Inspect layout with herdr pane layout --pane "$HERDR_PANE_ID", then split right or down:
herdr pane split --current --direction right --cwd "$PWD" --no-focus

Extract the new pane ID from .result.pane.pane_id.

  1. Start Agent: Ensure the target pane is at an idle interactive shell prompt, then start the agent:
herdr agent start reviewer --kind codex --pane <returned-pane-id>

Pass native arguments after --:

herdr agent start reviewer --kind codex --pane <returned-pane-id> -- --model claude-3-7-sonnet
  1. Prompt Agent & Wait for Completion:
herdr agent prompt reviewer "Review git diff and report actionable findings." --wait --timeout 120000

--wait automatically waits until the agent reaches idle, done, or blocked.

  1. Interact or Read Output:
herdr agent get reviewer
herdr agent read reviewer --source recent-unwrapped --lines 120

Send logical keys when needed (e.g. esc, ctrl+c, enter):

herdr agent send-keys reviewer ctrl+c

Running Background Commands

Run non-agent commands (e.g. test suites, build scripts, dev servers) in a separate pane:

# 1. Split a background pane
herdr pane split --current --direction right --cwd "$PWD" --no-focus

# 2. Execute command
herdr pane run <returned-pane-id> "cargo test"

# 3. Wait for expected output pattern
herdr pane wait-output <returned-pane-id> --match "test result" --timeout 120000

# 4. Read logs
herdr pane read <returned-pane-id> --source recent-unwrapped --lines 100

Read sources available:

  • visible: rendered viewport.
  • recent: recent rendered output with soft wraps.
  • recent-unwrapped: joined soft wraps (preferred for logs/transcripts).
  • detection: plain-text bottom buffer.

Operational Safety Rules

  • Always pass --no-focus for background operations unless the user explicitly requested a focus switch.
  • Target explicitly with --current, --pane <id>, or agent names rather than relying on UI focus.
  • Parse IDs directly from JSON outputs; never guess or hardcode them.
  • Never run herdr server stop or kill the main process unless the user explicitly requested server shutdown.

Role 2: Guiding Humans on Setup & Troubleshooting

When assisting a human user who is installing, learning, or configuring Herdr:

Concept Model

Explain Herdr concepts in this order:

  • Session: A persistent background server namespace. Running herdr attaches to the default session.
  • Workspace: Project-level container (one per repo or task). Groups tabs and panes, rolls up agent statuses in sidebar.
  • Tab: A layout view within a workspace (e.g. agents, server, logs).
  • Pane: A live terminal process. Splittable right or down, persists across client detach.
  • Agent: An AI agent process detected inside a pane (working, blocked, done, idle, unknown).
  • Modes: Terminal mode (keys to pane), Prefix mode (ctrl+b then action key), Navigate mode.

Installation

  • Linux & macOS:
curl -fsSL https://herdr.dev/install.sh | sh
herdr
  • Windows PowerShell:
powershell -ExecutionPolicy Bypass -c "irm https://herdr.dev/install.ps1 | iex"
herdr
  • Windows Command Prompt:
curl.exe -fsSLo install.cmd https://herdr.dev/install.cmd && install.cmd && del install.cmd
herdr
  • Package Managers: Also installable via Homebrew, Mise, or Nix. Update with herdr update (or package manager).

Mouse & Keyboard Interaction

  • Mouse First: Click panes/tabs to focus, drag borders to resize, right-click for context menus, drag-select to copy.
  • Prefix Key: Default is ctrl+b. Press prefix+? to show active keybindings.
  • Common Keybindings:
    • prefix+v: Split right
    • prefix+-: Split down
    • prefix+c: New tab
    • prefix+q: Detach session (leaves background processes running)
  • Alacritty macOS Command Keys: When running inside Alacritty on macOS, map Command-key shortcuts using Kitty CSI-u escapes (see resources/manual/herdr-alacritty.md).
  • Stopping Server: herdr server stop

Configuration

  • File Path:
    • Linux/macOS: ~/.config/herdr/config.toml
    • Windows: %APPDATA%\herdr\config.toml
  • Default Config: Print with herdr --default-config
  • Live Reload: Reload configuration without restarting: herdr server reload-config
  • Sections: [keys] (keybindings), [theme] (color schemes), [ui] (sidebar/status), [terminal] (shell defaults), [update] (release channels).

Troubleshooting Common Issues

  1. Agent not detected or wrong state:
    • Run herdr agent list and herdr agent explain <target> --json to view detection rationale.
    • Check integrations: herdr integration status.
  2. Keybinding does nothing:
    • Outer terminal or window manager intercepted the chord. Recommend alternative chords in config.toml or prefix chords.
  3. Logs & Diagnostics:
    • Inspect status: herdr status, herdr status server, herdr status client.
    • Logs reside in ~/.config/herdr/ (Linux/macOS) or %APPDATA%\herdr\ (Windows).

Last updated Oct 08, 2026