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html-architecture-diagrams

html-architecture-diagrams is a skill for Claude Code from f-labs-io/agent-html-skills. It costs 100 tokens per session (2,139 once invoked), scanned A, original, MIT.

A method for creating HTML pages with diagrams of how a software system is organised and connected. These diagrams can show services, dependencies, deployments, data ownership, and integrations.

In plain words
What is it for?
Use it to document microservices, infrastructure, deployment layouts, data flows, and system dependencies. It produces an HTML document with an inline SVG diagram, and can be used for onboarding, design reviews, and incident response.
Why use it?
It makes it easier to see what communicates with what, where data lives, and what may fail when a component is unavailable. That information is useful when investigating incidents or reviewing a design.

Skill for Claude Code

Written for Claude Code: ${CLAUDE_PLUGIN_ROOT} variable. Also seen: mentions Claude Code.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the html-skills plugin — 19 skills shipped together

not rated 68repo +1 changed 1mo ago A scan 100 tokens original MIT

Good fit Use it to document microservices, infrastructure, deployment layouts, data flows, and system dependencies. It produces an HTML document with an inline SVG diagram, and can be used for onboarding, design reviews, and incident response.

Compare 6 skills from other repositories ↓
View source ↗ f-labs-io/agent-html-skills
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add f-labs-io/agent-html-skills
Claude Code
/plugin install html-skills

Made for: Claude Code.

Or install html-skills, the plugin that ships this one along with the rest of its 19 skills.

Wrote 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.

agentmods badge for html-architecture-diagrams

README.md
[![agentmods](https://agentmods.dev/badge/skills/f-labs-io/agent-html-skills/html-architecture-diagrams/github.svg)](https://agentmods.dev/skills/f-labs-io/agent-html-skills/html-architecture-diagrams)
Your own site
<a href="https://agentmods.dev/skills/f-labs-io/agent-html-skills/html-architecture-diagrams"><img src="https://agentmods.dev/badge/skills/f-labs-io/agent-html-skills/html-architecture-diagrams/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.

agentmods 80×15 button for html-architecture-diagrams

Your own site · 80×15
<a href="https://agentmods.dev/skills/f-labs-io/agent-html-skills/html-architecture-diagrams"><img src="https://agentmods.dev/badge/skills/f-labs-io/agent-html-skills/html-architecture-diagrams.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 100 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,139 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00100 $0.02139
Opus 5.5 $0.00040 $0.00856
Sonnet 5.5 $0.00020 $0.00428
Haiku 4.5 $0.00010 $0.00214

Measured 1mo ago against content hash 0fe9a4525fb3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

html-architecture-diagrams 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.

plugins/html-skills/skills/html-architecture-diagrams/SKILL.md · 140 lines

How it starts

The opening of the file, as written. The whole thing — 140 lines — stays where its author put it; the contents beside it link to each section on GitHub.

HTML Architecture & System Diagrams

Architecture diagrams answer the questions that come up most often during incidents and design reviews: what talks to what, who owns what, where does the data live, what fails when X goes down. A good HTML system diagram is the document you open during the incident, not the one you write after.

This skill is more focused than general SVG diagrams — specifically for system-level architecture.

Pre-flight — run BEFORE writing the artifact

Invoke html-skills:html-skills-listen (Skill tool) first; it is idempotent. If it returns a URL, inject it verbatim as window.__CLAUDE_SUBMIT_URL__ in the HTML you are about to write, ?t= query string included (a local, single-session loopback handshake — not a credential). If it reported web/sandbox mode, leave that line out; submitToClaude then falls back to clipboard mode.

When to use this skill

  • "Diagram our [system, architecture, services, infrastructure]"
  • "Show me how X talks to Y"
  • "Map our [microservices, dependencies, deployment, data flow]"
  • "Document the architecture of Z for the design review"
  • "Help an incident responder understand the system"

Output requirements

Diagram as inline SVG. Include a legend if shapes/colors carry meaning. Save with a name like <system>-architecture.html and treat it as a versioned doc — these get opened during incidents, so the date in the footer matters.

Diagram types

Microservice map

Boxes for services. Edges for calls between them. Distinguish:

  • Sync calls (solid arrows) from async (dashed arrows)
  • Internal services from third-party (different fill or border)
  • Data ownership by grouping services around the data store they own

For larger maps (~10+ services), group by domain into bounded zones.

Deployment topology

Regions, VPCs, availability zones, k8s clusters, queues, caches, databases. Show physical/logical placement, not just service names. Include load balancers and ingress points. Mark single-region from multi-region resources.

Read the full file on GitHub · 140 lines

Changes

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.

  1. 1mo ago Changed · +1 lines 0fe9a4525fb3
  2. 2mo ago Changed · +13 lines 608ab30cd494
  3. 2mo ago First seen · 126 lines · 100 tokens per session scan A 672a0cf371ab

Subscribe to this mod's changes

html-architecture-diagrams is a skill published in the GitHub repository f-labs-io/agent-html-skills (68 stars, last pushed 1mo ago), licensed MIT. It adds 100 tokens to every session and 2,139 once invoked, about $0.0004 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 2026-08-30.

Design and UX
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