herdr-sessions

name	herdr-sessions
description	Control herdr from inside it. Manage workspaces and tabs, split panes, spawn agents, read output, and wait for state changes via CLI commands that talk to the running herdr instance over a local unix socket.

Managing herdr agent multiplexer sessions

before using this skill, check that HERDR_ENV=1. if it is not set to 1, say you are not running inside a herdr-managed pane and stop. do not inspect or control the focused herdr pane from outside herdr.

you are running inside herdr, a terminal-native agent multiplexer. herdr gives you workspaces, tabs, and panes — each pane is a real terminal with its own shell, agent, server, or log stream — and you can control all of it from the cli.

this means you can:

• see what other panes and agents are doing
• create tabs for separate subcontexts inside one workspace
• split panes and run commands in them
• start servers, watch logs, and run tests in sibling panes
• wait for specific output before continuing
• wait for another agent to finish
• spawn more agent instances

the herdr binary is available in your PATH. its workspace, tab, pane, and wait commands talk to the running herdr instance over a local unix socket.

if you need the raw protocol or full api reference, read the socket api docs.

concepts

workspaces are project contexts. each workspace has one or more tabs. unless manually renamed, a workspace's label follows the first tab's root pane — usually the repo name, otherwise the root pane's current folder name.

tabs are subcontexts inside a workspace. each tab has one or more panes.

panes are terminal splits inside a tab. each pane runs its own process — a shell, an agent, a server, anything.

agent status is detected automatically by herdr. the api exposes one public field for it:

• agent_status — idle, working, blocked, done, unknown

done means the agent finished, but you have not looked at that finished pane yet.

plain shells still exist as panes, but herdr's sidebar agent section intentionally focuses on detected agents rather than listing every shell.

ids — workspace ids look like 1, 2. tab ids look like 1:1, 1:2, 2:1. pane ids look like 1-1, 1-2, 2-1. these are compact public ids for the current live session.

important: ids can compact when tabs, panes, or workspaces are closed. do not treat them as durable ids. re-read ids from workspace list, tab list, pane list, or create/split responses when you need a current id. do not guess that an older 1-3 is still the same pane later.

discover yourself

see what panes exist and which one is focused:

herdr pane list

the focused pane is yours. other panes are your neighbors.

list workspaces:

herdr workspace list

tab management

list tabs in the current workspace:

herdr tab list --workspace 1

create a new tab:

herdr tab create --workspace 1

without --label, the new tab keeps the default numbered tab name.

create and name it in one step:

herdr tab create --workspace 1 --label "logs"

rename it:

herdr tab rename 1:2 "logs"

focus it:

herdr tab focus 1:2

close it:

herdr tab close 1:2

read another pane

see what is on another pane's screen:

herdr pane read 1-1 --source recent --lines 50

• --source visible = current viewport
• --source recent = recent scrollback as rendered in the pane
• --source recent-unwrapped = recent terminal text with soft wraps joined back together

split a pane and run a command

split your pane to the right and keep focus on your current pane:

herdr pane split 1-2 --direction right --no-focus

that prints json with the new pane nested at result.pane.pane_id. parse that value, then run a command in that pane:

NEW_PANE=$(herdr pane split 1-2 --direction right --no-focus | python3 -c 'import sys,json; print(json.load(sys.stdin)["result"]["pane"]["pane_id"])')
herdr pane run "$NEW_PANE" "npm run dev"

split downward instead:

herdr pane split 1-2 --direction down --no-focus

wait for output

block until specific text appears in a pane. useful for waiting on servers, builds, and tests.

for --source recent, matching uses unwrapped recent terminal text, so pane width and soft wrapping do not break matches. pane read --source recent still shows the pane as rendered. if you want to inspect the same transcript that the waiter matches, use pane read --source recent-unwrapped.

herdr wait output 1-3 --match "ready on port 3000" --timeout 30000

with regex:

herdr wait output 1-3 --match "server.*ready" --regex --timeout 30000

if it times out, exit code is 1.

wait for an agent status

block until another agent reaches a specific status:

herdr wait agent-status 1-1 --status done --timeout 60000

use this when you want the same done / idle distinction the UI shows.

send text or keys to a pane

send text without pressing Enter:

herdr pane send-text 1-1 "hello from claude"

press Enter or other keys:

herdr pane send-keys 1-1 Enter

pane run sends the text and then a real Enter key in one request:

herdr pane run 1-1 "echo hello"

workspace management

create a new workspace:

herdr workspace create --cwd /path/to/project

without --label, the new workspace keeps the default cwd-based name.

create and name one in one step:

herdr workspace create --cwd /path/to/project --label "api server"

create one without focusing it:

herdr workspace create --no-focus

focus a workspace:

herdr workspace focus 2

rename:

herdr workspace rename 1 "api server"

close:

herdr workspace close 2

close a pane

herdr pane close 1-3

recipes

run a server and wait until it is ready

NEW_PANE=$(herdr pane split 1-2 --direction right --no-focus | python3 -c 'import sys,json; print(json.load(sys.stdin)["result"]["pane"]["pane_id"])')
herdr pane run "$NEW_PANE" "npm run dev"
herdr wait output "$NEW_PANE" --match "ready" --timeout 30000
herdr pane read "$NEW_PANE" --source recent --lines 20

run tests in a separate pane and inspect the result

herdr pane split 1-2 --direction down --no-focus
herdr pane run 1-3 "cargo test"
herdr wait output 1-3 --match "test result" --timeout 60000
herdr pane read 1-3 --source recent --lines 30

check what another agent is working on

herdr pane list
herdr pane read 1-1 --source recent --lines 80

watch another pane robustly

use this pattern when you need to coordinate with a sibling pane:

# inspect what is already there
herdr pane read 1-3 --source recent --lines 40

# wait only for the next output you expect
herdr wait output 1-3 --match "ready" --timeout 30000

# if you need to inspect the same transcript the waiter matched,
# read the unwrapped recent text directly
herdr pane read 1-3 --source recent-unwrapped --lines 40

spawn a new agent and give it a task

herdr pane split 1-2 --direction right --no-focus
herdr pane run 1-3 "claude"
herdr wait output 1-3 --match ">" --timeout 15000
herdr pane run 1-3 "review the test coverage in src/api/"

coordinate with another agent

herdr wait agent-status 1-1 --status done --timeout 120000
herdr pane read 1-1 --source recent --lines 100

notes

• workspace list, workspace create, tab list, tab create, tab get, tab focus, tab rename, tab close, pane list, pane get, pane split, wait output, and wait agent-status print json on success.
• pane read prints text, not json.
• pane read --format ansi or pane read --ansi returns a rendered ANSI snapshot for TUI feedback loops.
• pane read --source recent-unwrapped is useful when you want to inspect the same unwrapped transcript that wait output --source recent matches against.
• pane send-text, pane send-keys, and pane run print nothing on success.
• parse ids from workspace create, tab create, and pane split responses when you need new ids. workspace create returns result.workspace, result.tab, and result.root_pane. tab create returns result.tab and result.root_pane. for pane split, the new pane id is at result.pane.pane_id.
• use pane read for current output that already exists. use wait output for future output you expect next.
• --no-focus on split, tab create, and workspace create keeps your current terminal context focused.
• without --label, workspace create keeps cwd-based naming and tab create keeps numbered naming.
• --label on tab create and workspace create applies the custom name immediately.
• if you are running inside herdr, the HERDR_ENV environment variable is set to 1.