Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add slamb2k/mad-skills/plugin install mad-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/slamb2k/mad-skills/ferry)<a href="https://agentmods.dev/skills/slamb2k/mad-skills/ferry"><img src="https://agentmods.dev/badge/skills/slamb2k/mad-skills/ferry/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/slamb2k/mad-skills/ferry"><img src="https://agentmods.dev/badge/skills/slamb2k/mad-skills/ferry.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00135 | $0.01971 |
| Opus 5 | $0.00068 | $0.00986 |
| Sonnet 5 | $0.00027 | $0.00394 |
| Haiku 4.5 | $0.00014 | $0.00197 |
Grade A, and why
ferry 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 9d 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 — 169 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Ferry - Clean-Context Session Handoff
When this skill is invoked, IMMEDIATELY output the banner below before doing anything else.
Pick ONE tagline at random — vary your choice each time.
CRITICAL: Reproduce the banner EXACTLY character-for-character, including the diagonal / glyph before the name.
{tagline}
/$$ /$$$$$$$$ /$$$$$$$$ /$$$$$$$ /$$$$$$$ /$$ /$$
/$$/| $$_____/| $$_____/| $$__ $$| $$__ $$| $$ /$$/
/$$/ | $$ | $$ | $$ \ $$| $$ \ $$ \ $$ /$$/
/$$/ | $$$$$ | $$$$$ | $$$$$$$/| $$$$$$$/ \ $$$$/
/$$/ | $$__/ | $$__/ | $$__ $$| $$__ $$ \ $$/
/$$/ | $$ | $$ | $$ \ $$| $$ \ $$ | $$
/$$/ | $$ | $$$$$$$$| $$ | $$| $$ | $$ | $$
|__/ |__/ |________/|__/ |__/|__/ |__/ |__/
Taglines:
- 📋 Filing the waybill for the crossing...
- 🧳 All aboard — carrying the context across!
- 🤝 Passing the waybill to a fresh crew!
- 📋 Waybill stamped, casting off to a clean session!
- 🌊 Ferrying the thread over calm water!
- 🛟 Nobody's work goes overboard on my watch!
- 🌅 New session on the far shore, same voyage!
- ⚓ Old session docked, new one boarding!
What this does
Ferry the live state of this session across a context reset: capture it into a
waybill document (waybill.md), arm a one-shot signal, and hand the user off to
a clean session that will automatically resume from the waybill. The point is to
reset the context window without losing the thread — the next session starts
lean but fully briefed.
Long sessions accumulate noise: dead ends, superseded plans, stale file reads. A
fresh session is faster and sharper, but naively starting over loses hard-won
context. /ferry distills only what the next session needs, persists it, and
signals that session to pick it up — once. It will not re-read old waybill on
unrelated future sessions, because the signal is consumed on first read.
Usage
/ferry # default: waybill.md in repo root, kept OUT of git
/ferry repo # same as default (explicit)
/ferry tmp # write under /tmp — never touches the repo at all
/ferry commit # write docs/ferry/waybill-<timestamp>.md, meant to be committed
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 9d ago First seen · 169 lines · 135 tokens per session scan A 0dd4f28848c5
ferry is a skill published in the GitHub repository slamb2k/mad-skills (5 stars, last pushed 2d ago), licensed MIT. It adds 135 tokens to every session and 1,971 once invoked, about $0.0007 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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