A set of unstyled React components for forms, menus, popovers, dialogs, and other interface controls. You provide the visual design while the components provide reusable behavior and accessibility guidance.

Use it to compose accessible form fields, navigation menus, overlays, notifications, toggles, sliders, and custom-styled controls with React.

It removes the need to build common interactive controls from scratch while leaving the appearance under your control.

base-ui — Skill for Claude Code and Codex by itechmeat/llm-code

Install

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.

Any agent

npx skills add itechmeat/llm-code --skill base-ui

Clone the repo

git clone --depth 1 https://github.com/itechmeat/llm-code

Made for: Claude Code, Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/itechmeat/llm-code/base-ui/github.svg)](https://agentmods.dev/skills/itechmeat/llm-code/base-ui)

Your own site

<a href="https://agentmods.dev/skills/itechmeat/llm-code/base-ui"><img src="https://agentmods.dev/badge/skills/itechmeat/llm-code/base-ui/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/itechmeat/llm-code/base-ui"><img src="https://agentmods.dev/badge/skills/itechmeat/llm-code/base-ui.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 67 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,967 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. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00067	$0.01967
Opus 5.5	$0.00027	$0.00787
Sonnet 5.5	$0.00013	$0.00393
Haiku 4.5	$0.00007	$0.00197

Measured 1mo ago against content hash 5715a98fd10c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

base-ui 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.

skills/base-ui/SKILL.md · 174 lines

How it starts

The opening of the file, as written. The whole thing — 174 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Base UI (React)

Base UI provides unstyled, composable React components. This skill focuses on assembling multi-part components, composing with the render prop, and meeting accessibility requirements while you supply styling.

Utilities

references/csp-provider.md
references/direction-provider.md
references/merge-props.md
references/use-render.md

Forms & inputs

references/form.md
references/fieldset.md
references/input.md
references/number-field.md
references/otp-field.md
references/radio.md
references/select.md
references/slider.md
references/switch.md

Feedback & status

references/meter.md
references/progress.md
references/toast.md

Menus, navigation, overlays

references/drawer.md
references/menu.md
references/menubar.md
references/navigation-menu.md
references/popover.md
references/preview-card.md
references/tooltip.md

Toggles & controls

references/toggle.md
references/toggle-group.md
references/toolbar.md

Layout & separators

references/scroll-area.md
references/separator.md

v1.7.0 - v1.8.0 highlights

Combobox adds a createItems collection API for building the option collection programmatically.
Avatar.Image adds a keepMounted prop so the image subtree stays mounted (useful for avoiding remount flashes).
Toast accepts functional updates derived from the current toast, and the render prop is honored in Toast.Title, Toast.Description, and Toast.Action.
Autocomplete and Combobox emit input-press and cancel-open change event details; inline Combobox exposes an expanded state.
Combobox.Item and Select.Item inherit the disabled state from their root.
Form focuses the first invalid field in document order; Field publishes neutral validity while async validation is in flight.
Mostly accessibility fixes, popup/overlay behavior fixes, and bundle-size reductions across drawers, menus, tooltips, and scroll areas.

Read the full file on GitHub · 174 lines

Files

What ships with it

29 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.

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.

1mo ago Changed · +10 lines 5715a98fd10c
1mo ago First seen · 164 lines · 67 tokens per session scan A bff003164cb6

Subscribe to this mod's changes

base-ui is a skill published in the GitHub repository itechmeat/llm-code (24 stars, last pushed 24d ago), licensed MIT. It adds 67 tokens to every session and 1,967 once invoked, about $0.0003 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.

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