Control herdr (a terminal-native agent multiplexer) from inside it. Manage workspaces and tabs, split panes, spawn sibling agents, read pane output, and wait for state changes — all via CLI commands that talk to the running herdr instance over a local unix socket. Use when running inside herdr (HERDR_ENV=1). Do not use outside herdr.
Installation
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Control herdr (a terminal-native agent multiplexer) from inside it. Manage workspaces and tabs, split panes, spawn sibling agents, read pane output, and wait for state changes — all via CLI commands that talk to the running herdr instance over a local unix socket. Use when running inside herdr (HERDR_ENV=1). Do not use outside herdr.
herdr
Purpose
You are running inside herdr — a terminal-native agent multiplexer that gives you workspaces, tabs, and panes. Each pane is a real terminal with its own shell, agent, server, or log stream, and the herdr binary on your PATH lets you control all of it from the CLI. Use this skill to inspect what other panes and agents are doing, split panes for parallel work (servers, tests, log streams, sibling agents), block until specific output or an agent state, and spawn additional agent instances.
Instructions
1. Discover the live state before you assume any id
ids in herdr (1 for workspaces, 1:1 for tabs, 1-1 for panes) are compact public ids that compact silently when things close. Always re-read them — never trust an id from earlier in the session.
herdr pane list # all panes; the focused one is yours
herdr workspace list # all workspaces
herdr tab list --workspace <ws-id> # tabs inside a workspace
If you need the workspace / tab / pane / agent_status model spelled out (including the meaning of done vs idle and the id-compaction warning in detail), read: references/concepts.md.
2. Pick the operation; look up the exact command, do not guess
The full command catalog (workspace / tab / pane create-focus-rename-close, send-text / send-keys / run, split, read, wait, plus the JSON shape each command prints) lives in references/commands.md. Read it before composing a command — flag names, --source modes, and JSON paths for new ids are easy to get wrong from memory.
Two rules that prevent the most common mistakes:
Use pane read for output that ALREADY EXISTS; use wait output for output you EXPECT NEXT. Do not poll pane read in a loop.
Parse new ids from the JSON response.workspace create returns result.workspace, result.tab, result.root_pane. tab create returns result.tab, result.root_pane. pane split returns result.pane.pane_id. Capture these into shell variables before downstream calls.
3. For multi-pane coordination, adapt a vetted recipe
Read: references/recipes.md for tested multi-step patterns — running a server and waiting until ready, running tests in a sibling pane and inspecting the result, watching another pane robustly under soft-wrapping, spawning a new agent and giving it a task, and blocking until another agent finishes (wait agent-status <pane> --status done). Each recipe handles the sharp edges (capturing the new pane id, picking the right --source, picking realistic timeouts). Adapt rather than rebuild from primitives.
Non-Negotiable Acceptance Criteria
The skill delivers nothing if any of these fails:
HERDR_ENV=1 was confirmed before any herdr command was issued. If the variable is unset, do not invoke this skill.
No id was reused without first re-confirming it via pane list / tab list / workspace list — or by parsing it from a fresh create / split JSON response. ids compact silently.
New pane / tab / workspace ids were parsed from the JSON response into a shell variable (e.g. NEW_PANE=$(... | python3 -c '...')). Never hard-coded, never guessed.
wait output was used for FUTURE output the agent expects next; pane read was used only for output that already exists. No pane read in a polling loop.
--no-focus was passed on pane split, tab create, and workspace create whenever the user's current focus should not be hijacked (default for headless agent runs).
When the matched text could be broken by soft-wrapping, --source recent-unwrapped was used for inspection. (wait output --source recent already matches against unwrapped text by default.)
--regex was passed on wait output only when the match string is actually a regex; literal matches do not set it.
Timeouts on wait output and wait agent-status reflect the operation's real duration (servers ≈ 30s, tests ≈ 60s, full agent runs ≥ 120s). On exit code 1 (timeout), the agent diagnoses the cause — never blindly retries.
When an operation prints JSON, the agent treats it as JSON (parses fields). When it prints text (pane read), the agent does not pipe it into a JSON parser.
Output
This skill emits a stream of CLI invocations and their captured artifacts:
Text-printing commands: pane read (the pane transcript itself).
Silent on success: pane send-text, pane send-keys, pane run.
When a step creates a new pane / tab / workspace, capture the parsed id into a shell variable (NEW_PANE, NEW_TAB, NEW_WS) and reuse it for downstream calls in the same recipe. When you read a pane, surface the relevant lines to the user — do not dump the full transcript.
