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 vanducng/skills --skill herdrgit clone --depth 1 https://github.com/vanducng/skillsWrote 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/vanducng/skills/herdr)<a href="https://agentmods.dev/skills/vanducng/skills/herdr"><img src="https://agentmods.dev/badge/skills/vanducng/skills/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/vanducng/skills/herdr"><img src="https://agentmods.dev/badge/skills/vanducng/skills/herdr.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- 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 | $0.00071 | $0.02694 |
| Opus 5 | $0.00036 | $0.01347 |
| Sonnet 5 | $0.00014 | $0.00539 |
| Haiku 4.5 | $0.00007 | $0.00269 |
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 8d 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.
How it starts
The opening of the file, as written. The whole thing — 241 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Herdr
Herdr is a terminal multiplexer and runtime for coding agents. It organizes terminals into workspaces, tabs, and panes, detects agent identity and status, and exposes the running session through the herdr CLI.
This skill adapts the official Herdr agent skill to the vd: workflow. The installed CLI remains authoritative when its syntax differs from this file; herdr --skill (0.8.0+) prints the exact skill bundled with the running binary.
Scope and routing
| Need | Owner |
|---|---|
| Inspect or control persistent visible panes, processes, output, and agent state | vd:herdr |
| Create an isolated checkout with copied env, ports, installs, and lifecycle hooks | vd:worktree |
| Run a deterministic structured fan-out or pipeline without needing visible panes | vd:codex-workflow |
| Conduct an end-to-end build, review, and ship workflow | vd:ultracook |
Mentioning Herdr authorizes control of the requested Herdr session. It does not authorize spawning agents, parallel work, new worktrees, merges, deployments, or destructive cleanup. Require the user's explicit request for those actions.
Before issuing any control command, check 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 running session. Use it to inspect neighboring work, create isolated terminal contexts, start agents and commands, read their output, and wait for state changes.
Learn the current CLI
The installed binary is the authority for command syntax. Begin with:
herdr --version
herdr --help
Then print the relevant command group by running it without a subcommand:
herdr pane
herdr workspace
herdr worktree
herdr tab
herdr wait
herdr agent
herdr notification
herdr integration
herdr session
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.
- 8d ago First seen · 241 lines · 71 tokens per session scan A 3d67b6edffec
herdr is a skill published in the GitHub repository vanducng/skills (7 stars, last pushed 5d ago), licensed MIT. It adds 71 tokens to every session and 2,694 once invoked, about $0.0004 per session on Opus 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 2026-08-31.
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