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 YangsonHung/awesome-agent-skills --skill feature-doc-splittergit clone --depth 1 https://github.com/YangsonHung/awesome-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/yangsonhung/awesome-agent-skills/feature-doc-splitter)<a href="https://agentmods.dev/skills/yangsonhung/awesome-agent-skills/feature-doc-splitter"><img src="https://agentmods.dev/badge/skills/yangsonhung/awesome-agent-skills/feature-doc-splitter/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/yangsonhung/awesome-agent-skills/feature-doc-splitter"><img src="https://agentmods.dev/badge/skills/yangsonhung/awesome-agent-skills/feature-doc-splitter.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 | $0.00028 | $0.01564 |
| Opus 5 | $0.00014 | $0.00782 |
| Sonnet 5 | $0.00006 | $0.00313 |
| Haiku 4.5 | $0.00003 | $0.00156 |
Grade A, and why
feature-doc-splitter 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 — 133 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Feature Doc Splitter
Overview
Use this skill to turn an early feature note into a small documentation set that engineers can implement independently. The output is three build-ready documents: an overview document, a frontend implementation document, and a backend implementation document.
The documentation must connect the request to the real codebase, separate frontend and backend responsibilities, define shared contracts, include required Mermaid diagrams, and make unknowns explicit. For new UI surfaces, the workflow also decides whether optional Pencil placeholders should be reserved.
When to Use
Use this skill when the user asks to:
- Split an initial feature requirement document into overview, frontend, and backend implementation documents.
- Convert rough product notes into build-ready technical documentation.
- Inspect an existing codebase before writing feature implementation docs.
- Add Mermaid business flows, interaction flows, sequence diagrams, or API contract indexes.
- Ask whether new frontend UI surfaces should reserve optional Pencil design placeholders.
Do not use
Do not use this skill for:
- Implementing the feature code itself.
- Writing a single unsplit PRD or marketing brief.
- Designing UI visuals in Pencil.
- Backend-only API design that does not require a three-document feature split.
- Frontend-only component work that does not require overview and backend implementation docs.
Instructions
Follow this workflow and keep the three output documents separated by owner responsibility.
Required Output
Create or update three documents:
- Overview document: goal, background, scope, non-goals, business objects, end-to-end flow, cross-team contracts, required Mermaid diagrams, rollout plan, risks, and acceptance criteria.
- Frontend implementation document: frontend-only routes, pages, sections, components, state, hooks, API integration points, interaction states, Mermaid flows, tests, and optional Pencil placeholders for new UI surfaces.
- Backend implementation document: backend-only data model, migrations, API routes, schemas, services, validation rules, statistics formulas, jobs, notification or event creation, Mermaid flows, tests, and acceptance criteria.
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 · 133 lines · 28 tokens per session scan A cb36833488cf
feature-doc-splitter is a skill published in the GitHub repository YangsonHung/awesome-agent-skills (18 stars, last pushed 1mo ago), licensed MIT. It adds 28 tokens to every session and 1,564 once invoked, about $0.0001 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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