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 blencorp/skills --skill irs-web-design-systemgit clone --depth 1 https://github.com/blencorp/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/blencorp/skills/irs-web-design-system)<a href="https://agentmods.dev/skills/blencorp/skills/irs-web-design-system"><img src="https://agentmods.dev/badge/skills/blencorp/skills/irs-web-design-system/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/blencorp/skills/irs-web-design-system"><img src="https://agentmods.dev/badge/skills/blencorp/skills/irs-web-design-system.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 | $0.00063 | $0.00561 |
| Opus 5 | $0.00032 | $0.00280 |
| Sonnet 5 | $0.00013 | $0.00112 |
| Haiku 4.5 | $0.00006 | $0.00056 |
Grade A, and why
irs-web-design-system 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 10d 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 — 39 lines — stays where its author put it; the contents beside it link to each section on GitHub.
IRS Web Design System
Before editing
- Confirm the product is inside this system's scope.
- Read references/implementation.md before installing, copying, or changing upstream assets.
- Read references/sources.md for provenance, version, and license.
- Inspect and preserve the target project's framework, package manager, asset pipeline, and accessibility tests.
Workflow
- Choose one documented delivery path and pin an exact package, commit, release, or downloaded asset snapshot.
- Use only official components, tokens, templates, and examples that are actually public.
- Extend through documented mechanisms. Label every unsupported addition as custom.
- Record the upstream version or commit and the accepted maturity/maintenance risk.
- Test keyboard operation, focus, names/roles/states, errors, status messages, contrast, zoom/reflow, responsive behavior, and supported browsers.
Boundaries
- Scope: IRS-governed web interfaces. The published material is a design guide for IRS.gov surfaces, not a complete department-wide component distribution.
- Delivery: Page-first guide from
IRS-Public/design: a canonicalirs.cssstylesheet plus base page templates mirroring live IRS.gov surfaces, built on USWDS with the IRS palette and masthead. No npm package is published and no build step is required. - Release: The guide describes itself as a proposal under active review. Pin an exact commit.
- License: No license file is present in the repository. Confirm reuse terms with the IRS before redistributing assets.
- Do not invent a registry package, component API, or release commitment.
- A separate repository,
irs-user-experience/irs-web-design-system, is hosted on a personal GitHub account rather than the IRS organization, and has not been updated since April 2025. Do not treat it as an official IRS distribution or merge its code with the design guide without confirming provenance. - Do not imply that a beta, hosted asset, code example, or product-specific repository is government-wide.
- Do not claim legal or WCAG conformance for the completed service solely from component use.
- If this system does not fit the product's requirements, route to the governing system or stop and explain the gap.
What ships with it
3 files 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.
- 10d ago First seen · 39 lines · 63 tokens per session scan A f46162c1f642
irs-web-design-system is a skill published in the GitHub repository blencorp/skills (5 stars, last pushed 22d ago), licensed Apache-2.0. It adds 63 tokens to every session and 561 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 2026-08-31.
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