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 Dragoon0x/dragoon-skills --skill plan-enggit clone --depth 1 https://github.com/Dragoon0x/dragoon-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/dragoon0x/dragoon-skills/plan-eng)<a href="https://agentmods.dev/skills/dragoon0x/dragoon-skills/plan-eng"><img src="https://agentmods.dev/badge/skills/dragoon0x/dragoon-skills/plan-eng/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/dragoon0x/dragoon-skills/plan-eng"><img src="https://agentmods.dev/badge/skills/dragoon0x/dragoon-skills/plan-eng.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 | $0.00116 | $0.00305 |
| Opus 5 | $0.00058 | $0.00152 |
| Sonnet 5 | $0.00023 | $0.00061 |
| Haiku 4.5 | $0.00012 | $0.00030 |
Grade A, and why
plan-eng 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.
What it actually says
/plan-eng
Generates an engineering plan template that respects the codebase's stack and current quality bar.
When to use
- After /brief, before implementation
- The user asks for "an engineering plan", "an architecture doc", "a design doc"
- Non-trivial features (anything more than a one-file change)
Output sections
- architecture (data model, api, state)
- edge cases (forces at least 5)
- test matrix (unit, integration, e2e, perf)
- existing dependencies (auto-loaded from package.json)
- migration / rollout (flags, backfill, rollback, observability)
- review checklist (gated on /critique threshold)
Run it
dragoon plan-eng "add user invites"
dragoon plan-eng "add user invites" --apply
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.
- 9d ago First seen · 32 lines · 116 tokens per session scan A b4d8f7dd5570
plan-eng is a skill published in the GitHub repository Dragoon0x/dragoon-skills (4 stars, last pushed 4mo ago), licensed MIT. It adds 116 tokens to every session and 305 once invoked, about $0.0006 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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