herdr is a background runtime that keeps coding-agent terminals and sessions running, even when a computer disconnects or restarts. It lets people and agents manage, inspect, and reconnect to sessions through a terminal interface or SSH while using tools such as Claude Code and Codex. The catalogue add-ons extend its panes and workflows.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add herdrdev/herdr --skill herdrgit clone --depth 1 https://github.com/herdrdev/herdrWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/herdrdev/herdr/herdr)<a href="https://agentmods.dev/skills/herdrdev/herdr/herdr"><img src="https://agentmods.dev/badge/skills/herdrdev/herdr/herdr/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/herdrdev/herdr/herdr"><img src="https://agentmods.dev/badge/skills/herdrdev/herdr/herdr.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00074 | $0.03270 |
| Opus 5.5 | $0.00030 | $0.01308 |
| Sonnet 5.5 | $0.00015 | $0.00654 |
| Haiku 4.5 | $0.00007 | $0.00327 |
Grade A, and why
herdr scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
8 near-identical copies found in the catalogue:
- herdr — 100% identical, 39 lines differ
- herdr — 97% identical, 41 lines differ
- herdr — 97% identical, 0 lines differ
- herdr — 97% identical, 222 lines differ
- herdr — 95% identical, 94 lines differ
- herdr — 91% identical, 51 lines differ
- herdr — 89% identical, 43 lines differ
- herdr — 89% identical, 43 lines differ
How it starts
The opening of the file, as written. The whole thing — 215 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Herdr
Herdr organizes terminals into workspaces, tabs, and panes, recognizes coding agents running inside panes, and exposes the current session through the herdr CLI.
Before issuing any control command, verify that this agent is running inside a Herdr-managed pane:
test "${HERDR_ENV:-}" = 1
If the check fails, say that you are not running inside Herdr and stop. Do not inspect or control the focused Herdr session from outside Herdr.
When the check passes, the herdr binary in PATH talks to the current session. Use it to inspect neighboring work, create terminal layout, start agents and commands, read output, and wait for state changes.
Learn the current CLI
The installed binary is the authority for command syntax. Start with:
herdr --help
Then print the relevant command group by running the group without a subcommand:
herdr agent
herdr pane
herdr workspace
herdr tab
herdr worktree
herdr terminal
herdr notification
herdr integration
herdr session
herdr machine
Do not run bare herdr for discovery; it launches or attaches the TUI. Do not probe a mutating nested command by omitting arguments. Commands such as herdr workspace create are valid with defaults and will execute.
Most control commands return JSON. Read identifiers and state from those responses instead of predicting them.
Understand layout, panes, and agents
Choose the primitive that matches the job:
- Workspace, tab, and pane topology organize terminal locations.
- Pane commands control raw terminals, shells, tests, servers, input, and output.
- Agent commands control the recognized coding agent currently occupying a pane.
A pane exists whether or not it contains an agent. agent start requires an existing available shell pane and never creates, splits, or moves layout. Use pane commands for ordinary processes. Use agent commands when Herdr must validate agent identity or interpret idle, working, blocked, done, and unknown lifecycle states.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago Changed fbd9d502767f
- 16d ago Changed b16ba0d9a22a
- 29d ago Changed · +12 lines 03855a7a1f9d
- 1mo ago Changed · +7 lines 25a68bc36d93
- 1mo ago First seen · 196 lines · 74 tokens per session scan A 237ad2ab2d81
herdr is a skill published in the GitHub repository herdrdev/herdr (44,216 stars, last pushed today), licensed Apache-2.0. It adds 74 tokens to every session and 3,270 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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requirements-writer
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