Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/matteotitta/genesys-skillsnpx agentmods add skills/matteotitta/genesys-skills/premortemWrote 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/matteotitta/genesys-skills/premortem)<a href="https://agentmods.dev/skills/matteotitta/genesys-skills/premortem"><img src="https://agentmods.dev/badge/skills/matteotitta/genesys-skills/premortem/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/matteotitta/genesys-skills/premortem"><img src="https://agentmods.dev/badge/skills/matteotitta/genesys-skills/premortem.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 | $0.00209 | $0.02246 |
| Opus 5 | $0.00105 | $0.01123 |
| Sonnet 5 | $0.00042 | $0.00449 |
| Haiku 4.5 | $0.00021 | $0.00225 |
Grade A, and why
premortem 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 11d 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 — 171 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/premortem — Imagine failure first, surface guardrails before commit
Two modes share one cognitive frame: write the obituary of the work, then reverse-engineer the avoidable failure. The mode flag picks the domain taxonomy.
| Mode | Use when | Domain taxonomy | Enforced how |
|---|---|---|---|
--plan |
Authoring a plan file in ~/.claude/plans/ |
5 strategic domains (positioning-messaging / channel-distribution / stakeholder-alignment / execution-velocity / market-regulatory) | BLOCK via .claude/hooks/exit-plan-premortem-check.sh at ExitPlanMode |
--output |
Producing a client-facing or external-facing deliverable (LinkedIn post, AEO article, landing-page-copy, proposal, positioning lock, messaging library, etc.) | 5 execution domains (will-it-resonate / will-it-convert / will-it-stay-on-brand / will-stakeholder-push-back / will-it-degrade-over-time) | SOFT-WARN via _schema/validate-frontmatter.py check_output_premortem_contract() |
If invoked without a flag, ask the user which mode applies. Don't generate a generic premortem — the value is in the mode-specific domains.
When to use --plan
You're writing a plan file (most often in ~/.claude/plans/ during plan mode, or a delivery plan in docs/). The Auto-Challenge Protocol "For Plans" check + the planning-doctrine pre-ExitPlanMode 8-gate already cover completeness and clarity. Premortem covers what those miss: strategic blind spots the author can't see because they just convinced themselves the approach works.
The hook enforces presence: ExitPlanMode will exit non-zero with Plan missing required ## Premortem section if you skip it.
When to use --output
You're producing a shippable deliverable. The output is going in front of a client, a prospect, an external audience, or a public surface. Examples:
- LinkedIn post, AEO article, newsletter issue
- Landing page copy, sales deck, proposal
- Positioning lock, messaging library, ICP synthesis ready for client review
- Pricing strategy doc, content strategy doc
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.
- 11d ago First seen · 171 lines · 209 tokens per session scan A 3984e4509d0b
premortem is a skill published in the GitHub repository matteotitta/genesys-skills (36 stars, last pushed 1mo ago), licensed MIT. It adds 209 tokens to every session and 2,246 once invoked, about $0.0010 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 2026-08-30.
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