html-doc: Design & UI for AI Agents | OpenAgentSkill

Overview

Generates a polished, static HTML reading view from an existing Markdown PRD or technical design. Use when a user asks to render, present, visualize, or make a PRD or design document easier for humans to read in a browser.

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HTML document

Turn one complete Markdown PRD or technical design into one verified static HTML page. Keep Markdown canonical. Change presentation, not meaning.

Boundaries

Accept an existing Markdown file or exact inline Markdown.
Support only prd and design document kinds.
Infer the kind only from the exact basename prd.md or design.md. Otherwise require the user or request to name it.
Do not write requirements, settle design choices, summarize missing content, or edit the source.
If the source is only a rough brief, use the appropriate authoring skill first.
Do not hand-edit generated HTML. Change the template or renderer, then regenerate.
Do not publish or host the result unless the user separately asks.

Requirements

Generation requires Python 3.11 or newer, Pandoc 3 or newer, Node.js 22.12 or newer, and npm. The skill directory contains a locked Mermaid dependency tree.

Before the first Mermaid render, run:

npm ci --prefix <skill-directory>

Use scripts/html_doc.py from this skill directory for all generation and lifecycle operations.

Workflow

1. Read and classify the source

Read the complete source. Confirm it is no larger than 2 MiB. Determine the document kind from the request or the exact basename rule.

Treat content problems separately from presentation problems. If the Markdown contradicts itself, omits a required decision, or contains an invalid diagram, report that source problem. Do not silently repair its meaning.

2. Create a candidate

For a file source:

python3 <skill-directory>/scripts/html_doc.py render <source.md> --kind <prd-or-design> --out <output.html>

--kind may be omitted only for exact prd.md and design.md basenames. --out may be omitted to create a sibling HTML file.

For exact inline Markdown, pipe it through standard input and provide both kind and output:

python3 <skill-directory>/scripts/html_doc.py render --inline --kind <prd-or-design> --out <output.html>

The command returns JSON containing candidate, output, and token. It does not replace the final output. Keep those exact values for verification and finalization.

If an output lock already exists, do not delete it automatically. It may represent another pending render. Report its path. Use discard --force-stale only when the state is known to be abandoned.

3. Verify the candidate in a real browser

Open the candidate as a local file. Do not treat source inspection as browser proof.

Check all of these:

desktop at 1440 CSS pixels;
tablet at 768 CSS pixels;
mobile at 390 CSS pixels;
A4 and US Letter print preview;
table-of-contents links and section targets;
keyboard order from skip link through navigation and document links;
visible focus indicators;
one main landmark and a sensible heading outline;
unique DOM IDs;
horizontal overflow, clipped text, code, tables, and diagrams;
useful diagram alternatives and accessible disclosure controls;
console errors and failed resource requests;
operation with browser network access disabled.

Compare the canonical content inside main with the Markdown abstract syntax tree. Navigation, source metadata, and derived accessibility text are not canonical content. Each top-level source block must map to one ordered data-source-block node with its SHA-256 identity and nested content intact. A Mermaid block maps to one figure whose exact source appears once in its disclosure.

If a presentation defect comes from the shared renderer or styles, fix that source and regenerate. If it is a content defect, leave the source and candidate unchanged and report it.

4. Finalize or discard

Only after every check passes, atomically install the candidate:

python3 <skill-directory>/scripts/html_doc.py finalize --out <output.html> --token <token>

If any check fails, remove only this pending candidate:

python3 <skill-directory>/scripts/html_doc.py discard --out <output.html> --token <token>

Finalization performs one same-directory atomic replacement. It never deletes the previous output first. A failed render, check, or replacement must leave the previous verified output byte-for-byte unchanged.

Output standard

The final page must:

preserve source wording and order;
use canonical prd or design machine metadata;
record the source path and SHA-256 hash;
use semantic HTML, inline CSS, and no runtime JavaScript;
contain no external runtime assets;
use a restrained blue-grey visual system;
remain readable without color, a mouse, a wide screen, or network access;
include responsive and print styles;
embed validated Mermaid SVG as a base64 image and retain the exact source in a disclosure.

Return

Stop when the verified candidate is finalized. Report the output path, source hash, and browser checks performed.

View source ↗

File metadata

name: html-doc
description: Generates a polished, static HTML reading view from an existing Markdown PRD or technical design. Use when a user asks to render, present, visualize, or make a PRD or design document easier for humans to read in a browser.

View original text

---
name: html-doc
description: Generates a polished, static HTML reading view from an existing Markdown PRD or technical design. Use when a user asks to render, present, visualize, or make a PRD or design document easier for humans to read in a browser.
---

# HTML document

Turn one complete Markdown PRD or technical design into one verified static HTML page. Keep Markdown canonical. Change presentation, not meaning.

## Boundaries

- Accept an existing Markdown file or exact inline Markdown.
- Support only `prd` and `design` document kinds.
- Infer the kind only from the exact basename `prd.md` or `design.md`. Otherwise require the user or request to name it.
- Do not write requirements, settle design choices, summarize missing content, or edit the source.
- If the source is only a rough brief, use the appropriate authoring skill first.
- Do not hand-edit generated HTML. Change the template or renderer, then regenerate.
- Do not publish or host the result unless the user separately asks.

## Requirements

Generation requires Python 3.11 or newer, Pandoc 3 or newer, Node.js 22.12 or newer, and npm. The skill directory contains a locked Mermaid dependency tree.

Before the first Mermaid render, run:

```bash
npm ci --prefix <skill-directory>
```

Use `scripts/html_doc.py` from this skill directory for all generation and lifecycle operations.

## Workflow

### 1. Read and classify the source

Read the complete source. Confirm it is no larger than 2 MiB. Determine the document kind from the request or the exact basename rule.

### 2. Create a candidate

For a file source:

```bash
python3 <skill-directory>/scripts/html_doc.py render <source.md> --kind <prd-or-design> --out <output.html>
```

`--kind` may be omitted only for exact `prd.md` and `design.md` basenames. `--out` may be omitted to create a sibling HTML file.

For exact inline Markdown, pipe it through standard input and provide both kind and output:

```bash
python3 <skill-directory>/scripts/html_doc.py render --inline --kind <prd-or-design> --out <output.html>
```

The command returns JSON containing `candidate`, `output`, and `token`. It does not replace the final output. Keep those exact values for verification and finalization.

If an output lock already exists, do not delete it automatically. It may represent another pending render. Report its path. Use `discard --force-stale` only when the state is known to be abandoned.

### 3. Verify the candidate in a real browser

Open the candidate as a local file. Do not treat source inspection as browser proof.

Check all of these:

- desktop at 1440 CSS pixels;
- tablet at 768 CSS pixels;
- mobile at 390 CSS pixels;
- A4 and US Letter print preview;
- table-of-contents links and section targets;
- keyboard order from skip link through navigation and document links;
- visible focus indicators;
- one `main` landmark and a sensible heading outline;
- unique DOM IDs;
- horizontal overflow, clipped text, code, tables, and diagrams;
- useful diagram alternatives and accessible disclosure controls;
- console errors and failed resource requests;
- operation with browser network access disabled.

Compare the canonical content inside `main` with the Markdown abstract syntax tree. Navigation, source metadata, and derived accessibility text are not canonical content. Each top-level source block must map to one ordered `data-source-block` node with its SHA-256 identity and nested content intact. A Mermaid block maps to one figure whose exact source appears once in its disclosure.

If a presentation defect comes from the shared renderer or styles, fix that source and regenerate. If it is a content defect, leave the source and candidate unchanged and report it.

### 4. Finalize or discard

Only after every check passes, atomically install the candidate:

```bash
python3 <skill-directory>/scripts/html_doc.py finalize --out <output.html> --token <token>
```

If any check fails, remove only this pending candidate:

```bash
python3 <skill-directory>/scripts/html_doc.py discard --out <output.html> --token <token>
```

## Output standard

The final page must:

- preserve source wording and order;
- use canonical `prd` or `design` machine metadata;
- record the source path and SHA-256 hash;
- use semantic HTML, inline CSS, and no runtime JavaScript;
- contain no external runtime assets;
- use a restrained blue-grey visual system;
- remain readable without color, a mouse, a wide screen, or network access;
- include responsive and print styles;
- embed validated Mermaid SVG as a base64 image and retain the exact source in a disclosure.

## Return

Stop when the verified candidate is finalized. Report the output path, source
hash, and browser checks performed.

Review the source

Skill source recorded

Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

License: MIT

Dependency or permission surface needs review
Permission surface may require sandboxing
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

Open full audit

Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.

Start with one small task

1Read the source. Confirm the input, expected output, dependencies and permissions.
2Ask your agent for a plan. Approve setup and any costs before running a small isolated test.
3Check the output and changed files. Report only what actually ran; keep the source revision for reproduction.

Check the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.

Source & usage notes

Indexed

Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.

Source repository: owainlewis/blueprint
License: MIT
Version: 1.0.0
Last GitHub push: Aug 29, 2026
Registry updated: Sep 5, 2026
Instruction path: skills/html-doc/SKILL.md @ 722e5f99878a

Version reported in registry metadata; check source releases before relying on it.

Quality

72/100

Strong

Trust

65/100

Sandbox only

Agent access

This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.

Open install API LLM text format Open manifest Auto-resolve Plan

More details

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}

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Creator: owainlewis
Source: owainlewis/blueprint
Indexed by: OpenAgentSkill community index

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