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 storybookjs/mcp --skill storiesgit clone --depth 1 https://github.com/storybookjs/mcpWrote 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/storybookjs/mcp/stories)<a href="https://agentmods.dev/skills/storybookjs/mcp/stories"><img src="https://agentmods.dev/badge/skills/storybookjs/mcp/stories/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/storybookjs/mcp/stories"><img src="https://agentmods.dev/badge/skills/storybookjs/mcp/stories.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 3 findings, 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 11 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]
- medium MCP Rug Pull · line 15 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]
- medium MCP Rug Pull · line 17 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 | $0.00077 | $0.00560 |
| Opus 5 | $0.00039 | $0.00280 |
| Sonnet 5 | $0.00015 | $0.00112 |
| Haiku 4.5 | $0.00008 | $0.00056 |
Grade A, and why
stories 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 9d 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.
What it actually says
Prerequisites:
- Storybook must be installed in the project. Invoke the
/storybook-initskill to set up Storybook, but only if the user explicitly invoked this skill and approves a Storybook installation. - Storybook must be at least 10.5 (or
nextwhile 10.5 is not yet released). Invoke the/storybook-upgradeskill to upgrade it, but only if the user explicitly approved a Storybook upgrade. - Ensure
@storybook/addon-mcpis installed. If it is missing, install it withnpx storybook add @storybook/addon-mcp.
Run the Storybook dev server and every storybook ai command from the same working directory: the package where Storybook is installed (in a monorepo often a leaf package such as packages/ui).
Run STORYBOOK_FEATURE_AI_CLI=1 npx storybook ai --help and read the output in its entirety to get the mandatory, ordered workflow for working on UI changes, writing stories, and keeping stories in sync with every frontend component you create, modify, or delete. This workflow explains how to write stories, preview stories, and display a curated Storybook review.
Before invoking any storybook ai command for the first time in a session, run STORYBOOK_FEATURE_AI_CLI=1 npx storybook ai <command> --help and read it fully. The top-level help only lists the commands; each command's payload shape and usage rules (which fields to include when) live in its own help output. Never guess a --json payload from the command name — a validation error only reports missing required fields, not the optional fields the workflow expects you to provide.
Some commands require a running Storybook dev server. When Claude preview tooling is available, start the dev server through that tooling:
- Ensure there is a Storybook launch entry in
.claude/launch.json(thepreview_starttool description documents the file format) withautoPort: trueandport: 6006. Use the project's preferred package manager and existingpackage.jsonStorybook script instead of inventing a new command whenever possible. - Start the Storybook launch entry with the
preview_starttool.
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.
- 9d ago First seen · 23 lines · 77 tokens per session scan A a32e6eabb75c
stories is a skill published in the GitHub repository storybookjs/mcp (270 stars, last pushed yesterday), licensed MIT. It adds 77 tokens to every session and 560 once invoked, about $0.0004 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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