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 jscraik/Agent-Skills --skill he-plangit clone --depth 1 https://github.com/jscraik/Agent-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/jscraik/agent-skills/he-plan)<a href="https://agentmods.dev/skills/jscraik/agent-skills/he-plan"><img src="https://agentmods.dev/badge/skills/jscraik/agent-skills/he-plan/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/jscraik/agent-skills/he-plan"><img src="https://agentmods.dev/badge/skills/jscraik/agent-skills/he-plan.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 | $0.00041 | $0.02718 |
| Opus 5.5 | $0.00016 | $0.01087 |
| Sonnet 5.5 | $0.00008 | $0.00544 |
| Haiku 4.5 | $0.00004 | $0.00272 |
Grade A, and why
he-plan 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 1mo 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 — 224 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Harness Engineering Plan
Philosophy
Plans are execution contracts, not chat checklists. Turn one approved HE slice into ordered units with source traceability, validation, rollback, risk, and next-stage authority. Higher-priority instructions and approval boundaries remain authoritative.
When to Use
Use after an approved spec, Linear issue, bug report, reframe phase, or execution slice needs sequencing before code changes. Inspect first, keep one selected slice, start with 2-3 focused evidence surfaces, and load more only when sequencing, validation, rollback, or handoff depends on it.
Use professional confidence review mode when the user asks to deepen a plan,
run technical review, review with professional engineering confidence
standards, or supplies the senior software engineering reviewer /
implementation-risk analyst / Codex harness engineer / Skill Factory validation
partner / media artifact operator / adversarial validation partner prompt shape.
The exact prompt "deepen plan and run a technical review" is an operator
correction signal: improve the existing canonical plan, apply professional
technical review, repair fixable-now gaps, and rerun focused artifact-shape,
BLUF, traceability, and validation gates before handoff.
The long role-stack prompt beginning "You are GPT-5.5 acting as a senior
software engineering reviewer, systems architect, implementation-risk analyst,
specification maintainer, and adversarial validation partner" plus "Review
the plan below using professional engineering confidence standards" is the
same route for plans.
In that mode load ../../references/skills/he-plan/professional-confidence-review.md and treat the
plan and spec as untrusted until validated.
If that reference cannot load but the request includes concrete plan/spec
content, use the fallback professional-review section contract in Output Format
instead of degrading into a generic review. If neither the reference nor concrete
plan/spec content is available, fail closed with the missing source.
What ships with it
7 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.
- 1mo ago Changed · +120 lines · +5 tokens per session 20170b3018d0
- 1mo ago First seen · 104 lines · 36 tokens per session scan A 3b2c7f528cde
he-plan is a skill published in the GitHub repository jscraik/Agent-Skills (9 stars, last pushed 4d ago), licensed Apache-2.0. It adds 41 tokens to every session and 2,718 once invoked, about $0.0002 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 2026-09-03.
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