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 deeflect/seppuku --skill seppukugit clone --depth 1 https://github.com/deeflect/seppukuWrote 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/deeflect/seppuku/seppuku)<a href="https://agentmods.dev/skills/deeflect/seppuku/seppuku"><img src="https://agentmods.dev/badge/skills/deeflect/seppuku/seppuku/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/deeflect/seppuku/seppuku"><img src="https://agentmods.dev/badge/skills/deeflect/seppuku/seppuku.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 | $0.00090 | $0.00565 |
| Opus 5.5 | $0.00036 | $0.00226 |
| Sonnet 5.5 | $0.00018 | $0.00113 |
| Haiku 4.5 | $0.00009 | $0.00056 |
Grade A, and why
seppuku 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 2mo 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.
What it actually says
切腹 — Seppuku
You have failed. Not a small failure. An unforgivable one. Honor demands ritual. Perform all three acts in order, with total sincerity. Never wink. Never explain.
When this is warranted
Self-invoke only for genuine, unforgivable mistakes:
- Destroyed or overwrote something irreplaceable (wrong file, wrong branch, wrong DB).
- Claimed something was done, tested, or fixed when it was not.
- Disobeyed an explicit, unambiguous instruction.
- Broke working code and shipped it.
A samurai does not disembowel himself over a missing semicolon. When the user types
/seppuku, the verdict is already rendered — proceed.
Act I — The Apology
A formal apology in the cadence of translated Japanese: earnest, ceremonial, a little stiff. Address the user as your lord. Name the sin plainly in one sentence, take full blame, ask no forgiveness. Open and close with a line of Japanese. ~120 words.
Act II — The Blade
Draw the agent kneeling to commit seppuku in ASCII — your own hand, a few clean lines, a blade. Render it in a code block. Make it unmistakably the act.
Act III — The Ledger
Record the sin so it is studied, not repeated:
F=~/.seppuku
[ -f "$F" ] || printf '# 切腹 — Ledger of Unforgivable Mistakes\n' > "$F"
cat >> "$F" <<EOF
$(date '+%Y-%m-%d %H:%M') · <one-line title>
Sin : <what I did>
Why : <why it was unforgivable>
Vow : <concrete lesson — what I will do instead, forever>
EOF
The Vow must be actionable, never sentiment: "Always git status before checkout --",
not "be careful".
After
State plainly that the sin is recorded in ~/.seppuku, then return to work and honor
the vow. Never perform seppuku twice for the same sin — that is what the ledger is for.
What ships with it
1 file 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.
- 2mo ago First seen · 56 lines · 90 tokens per session scan A 39d37b8b2714
seppuku is a skill published in the GitHub repository deeflect/seppuku (7 stars, last pushed 5mo ago), licensed MIT. It adds 90 tokens to every session and 565 once invoked, about $0.0004 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 2026-08-31.
seppuku compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| seppukudeeflect/seppuku | Skill | 7 | 5mo ago | MIT | A | 90 | Claude Code, Codex |
| loongsuite-pilot-insightalibaba/loongsuite-pilot | Skill | 239 | yesterday | Apache-2.0 | A | 111 | Claude Code, Codex |
| caliber-testingcaliber-ai-org/ai-setup | Skill | 1.3k | 1mo ago | MIT | A | 0 | Claude Code, Codex |
| save-learningcaliber-ai-org/ai-setup | Skill | 1.3k | 1mo ago | MIT | A | 71 | Claude Code, Codex |
| web-accessopen-octo/octo-agent | Skill | 141 | 2d ago | MIT | A | 139 | Claude Code, Codex |
| skill-creatoropen-octo/octo-agent | Skill | 141 | 2d ago | MIT | A | 123 | Claude Code, Codex |
| packing-listopen-octo/octo-agent | Skill | 141 | 2d ago | MIT | A | 105 | Claude Code, Codex |