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/cognitedata/builder-skillsnpx agentmods add skills/cognitedata/builder-skills/hide-show-shellWrote 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/cognitedata/builder-skills/hide-show-shell)<a href="https://agentmods.dev/skills/cognitedata/builder-skills/hide-show-shell"><img src="https://agentmods.dev/badge/skills/cognitedata/builder-skills/hide-show-shell.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium MCP Rug Pull · line 25 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
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 | $0.00095 | $0.02768 |
| Opus 5 | $0.00048 | $0.01384 |
| Sonnet 5 | $0.00019 | $0.00554 |
| Haiku 4.5 | $0.00010 | $0.00277 |
Grade A, and why
hide-show-shell 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 8d 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 — 275 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Hide & Show the Fusion Shell
Lets a Flows app hide the Fusion sidebar + topbar (the "shell") to use the full browser viewport, and reveal it again — without leaving the user stranded.
Requires @cognite/app-sdk's connectToHostApp() handshake already wired
up, and @cognite/app-sdk >= 0.9.0 (verify with npm ls @cognite/app-sdk
or check package.json — earlier versions don't expose setHideShell on
HostAppAPI at all). If auth isn't wired up yet, run the
setup-flows-auth skill first — but make sure
it lands on the Apps API flow (app.json has "infra": "appsApi",
deployed with npx @cognite/cli@latest apps deploy), not the Classic
flow (DuneAuthProvider/useDune() from @cognite/dune). setHideShell
only exists on the Apps API's HostAppAPI; Classic apps have no equivalent
and are deployed to infrastructure @cognite/cli itself refuses to touch
("Legacy infrastructure is no longer supported"). If app.json is missing
infra: "appsApi" or @cognite/dune shows up in package.json, stop and
migrate to Apps API first — don't attempt this skill on a Classic app.
What it does
HostAppAPI.setHideShell(hidden: boolean): Promise<void> (from the api
object returned by connectToHostApp()):
setHideShell(true)— hides the CDF sidebar and topbar, giving the app the full viewport.setHideShell(false)— reveals them again.
Under the hood this toggles a bookmarkable ?hideShell=true URL parameter —
no server round-trip, and a shared link already opens in full-screen mode.
The shell also auto-reveals if the user navigates away from your app, as
a safety net — but don't rely on that as your only way back.
There is no other safety net. While the shell is hidden, Fusion does not render any floating "reveal" button of its own — the navrail (and any toggle button inside it) is unmounted along with the rest of the shell. The only ways back are: your app's own reveal control, manually editing the URL, or navigating away entirely. Treat the guidance below as non-negotiable, not a nice-to-have.
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.
- 8d ago First seen · 275 lines · 95 tokens per session scan A b84bc3c7f327
hide-show-shell is a skill published in the GitHub repository cognitedata/builder-skills (6 stars, last pushed today), licensed Apache-2.0. It adds 95 tokens to every session and 2,768 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 2026-08-31.
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