Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/CrowdStrike/foundry-skillsnpx agentmods add skills/crowdstrike/foundry-skills/ui-developmentWrote 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/crowdstrike/foundry-skills/ui-development)<a href="https://agentmods.dev/skills/crowdstrike/foundry-skills/ui-development"><img src="https://agentmods.dev/badge/skills/crowdstrike/foundry-skills/ui-development/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/crowdstrike/foundry-skills/ui-development"><img src="https://agentmods.dev/badge/skills/crowdstrike/foundry-skills/ui-development.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00113 | $0.05203 |
| Opus 5.5 | $0.00045 | $0.02081 |
| Sonnet 5.5 | $0.00023 | $0.01041 |
| Haiku 4.5 | $0.00011 | $0.00520 |
Grade A, and why
ui-development 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 2d 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 — 383 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Foundry UI Development
Build UI with Shoelace components using the
falcon-shoelacetheme (not vanilla Shoelace or raw HTML), and load both the dark and light theme stylesheets so it matches the Falcon console. Usefoundry ui runfor live development, and apply the iframe security patterns to every extension.
Part of a suite. If
development-workflowhas not already run, and this is a new app or its first capability, load thedevelopment-workflowskill first — it owns the CLI prerequisite check, scaffolding order, and manifest coordination.
Falcon Foundry UI pages and extensions use React or Vue with the Shoelace design system (Falcon-themed) and Foundry-JS for platform integration.
Pages vs Extensions
If the user doesn't specify page or extension, ask which they prefer before scaffolding. Present this table to help them decide:
| UI Pages | UI Extensions | |
|---|---|---|
| What | Standalone applications | Console-embedded components |
| Where | Full-page view in Falcon console | Sidebar widget in detection/host/incident pages |
| Sockets | N/A | One per extension (see socket table below) |
| Use when | Complex interactions, multiple views, dashboards | Contextual enrichment, quick-glance data |
| Framework | Vue, React, or Vanilla JS | Vue, React, or Vanilla JS |
CLI Scaffolding
# Create a React page
foundry ui pages create --name "my-page" --description "Page description" --from-template React --homepage --no-prompt
# Create a Vanilla JS page (no npm install or build step needed)
foundry ui pages create --name "my-page" --description "Page description" --from-template "Vanilla JS" --homepage --no-prompt
# Add navigation entry (separate step — --no-prompt skips this during page creation)
foundry ui navigation add --name "My Page" --path / --ref pages.my-page
# Create an extension targeting a console socket
# REQUIRED: --sockets must be specified — omitting it launches an interactive picker that hangs with Error: EOF
# REQUIRED: Use ONLY values from the Extension Socket Locations table below — do NOT guess socket IDs
foundry ui extensions create --name "my-ext" --description "Description" --from-template React --sockets "activity.detections.details" --no-prompt
# Create a Vanilla JS extension (no npm install or build step needed)
foundry ui extensions create --name "my-ext" --description "Description" --from-template "Vanilla JS" --sockets "activity.detections.details" --no-prompt
What ships with it
8 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.
- 2d ago Changed · +1 lines eda6b24864b7
- 15d ago Changed 8d0b68764321
- 17d ago Changed · -10 lines bb06947c4f47
- 23d ago Changed · +18 lines 629d1ddc1a6f
- 25d ago Changed 75f68af64fb0
- 1mo ago First seen · 374 lines · 113 tokens per session scan A b533550837f4
ui-development is a skill published in the GitHub repository CrowdStrike/foundry-skills (35 stars, last pushed today), licensed MIT. It adds 113 tokens to every session and 5,203 once invoked, about $0.0005 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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