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 agentmods add skills/plannotator/effective-html/html-plannpx skills add plannotator/effective-html --skill html-plangit clone --depth 1 https://github.com/plannotator/effective-htmlWhat 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 | $0.00061 | $0.00455 |
| Opus 5 | $0.00030 | $0.00228 |
| Sonnet 5 | $0.00012 | $0.00091 |
| Haiku 4.5 | $0.00006 | $0.00046 |
Grade A, and why
html-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 yesterday.
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 — 46 lines — stays where its author put it; the contents beside it link to each section on GitHub.
HTML Plan
Turn source material into a plan people can inspect and act on. Preserve the user's scope, ordering, commitments, and terminology unless they ask for broader synthesis.
Shape the document around the work
Read the conversation, project instructions, and supplied plan before designing. Match an existing design language when one is present. Otherwise derive a quiet, workmanlike direction from the audience and subject.
When design-artifact is available, read its
fundamentals to make that direction intentional. Keep this skill's traceability
and source-preservation rules authoritative; creative direction must not
inflate the plan into a dashboard or campaign page.
Decide what the plan actually needs:
- phases or sequence;
- status and decision points;
- owners and collaborators;
- dependencies and risks;
- acceptance checks;
- unresolved questions.
Do not add a timeline, progress percentage, status badge, or dashboard summary unless the source supports it. Improve grammar and structure without inflating an implementation plan into a strategy document.
Preserve traceability
- Keep source commitments recognizable.
- Separate accepted decisions from assumptions and open questions.
- Show sequence and dependency only where they are real.
- Use tables for exact mappings, comparisons, or repeated fields.
- Use a flow or timeline only when it makes order materially easier to understand.
- Keep long prose readable instead of forcing every paragraph into a card.
Build and verify
Deliver one responsive, accessible, self-contained HTML file. Use semantic headings, lists, tables, and landmarks. Keep essential CSS and JavaScript inline, avoid external services, and make any navigation or disclosure keyboard-operable.
Inspect the result at wide and narrow widths. Check that no commitment disappeared, that stages remain in the intended order, that ownership and dependencies are legible, and that long content does not overflow.
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.
- yesterday First seen · 46 lines · 61 tokens per session scan A 8e315b5f775d
html-plan is a skill published in the GitHub repository plannotator/effective-html (2,735 stars, last pushed 28d ago), licensed MIT. It adds 61 tokens to every session and 455 once invoked, about $0.0003 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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