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.
/plugin marketplace add f-labs-io/agent-html-skills/plugin install html-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/f-labs-io/agent-html-skills/html-architecture-diagrams)<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.
<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>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 | $0.00100 | $0.02032 |
| Opus 5 | $0.00050 | $0.01016 |
| Sonnet 5 | $0.00020 | $0.00406 |
| Haiku 4.5 | $0.00010 | $0.00203 |
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 7d 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 — 139 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.
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.
- 7d ago Changed · +13 lines 608ab30cd494
- 11d ago First seen · 126 lines · 100 tokens per session scan A 672a0cf371ab
html-architecture-diagrams is a skill published in the GitHub repository f-labs-io/agent-html-skills (55 stars, last pushed 9d ago), licensed MIT. It adds 100 tokens to every session and 2,032 once invoked, about $0.0005 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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