Borrowing it
Nothing to install: this file belongs to saschb2b/okf-studio. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/saschb2b/okf-studio/main/.agents/skills/javascript-ecosystem/SKILL.mdgit clone --depth 1 https://github.com/saschb2b/okf-studioWrote 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/saschb2b/okf-studio/javascript-ecosystem)<a href="https://agentmods.dev/skills/saschb2b/okf-studio/javascript-ecosystem"><img src="https://agentmods.dev/badge/skills/saschb2b/okf-studio/javascript-ecosystem/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/saschb2b/okf-studio/javascript-ecosystem"><img src="https://agentmods.dev/badge/skills/saschb2b/okf-studio/javascript-ecosystem.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 | $0.00179 | $0.05586 |
| Opus 5.5 | $0.00072 | $0.02234 |
| Sonnet 5.5 | $0.00036 | $0.01117 |
| Haiku 4.5 | $0.00018 | $0.00559 |
Grade A, and why
javascript-ecosystem 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 3d 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 — 283 lines — stays where its author put it; the contents beside it link to each section on GitHub.
JavaScript Ecosystem
LLMs default to the framework versions and patterns their training data over-represents, which skew years behind the current stable releases. This skill is a changelog index that pulls default output forward to the latest stable major and its paradigm.
"Every AI coding tool in 2026 produces the same React app. The brand on the box is different. The code inside is not."
Rule
Write for the version the project actually has, targeting the current paradigm, not the version your training data over-represents. Version numbers move fast; the paradigm shifts move slowly. When unsure, trust the paradigm direction and verify the exact version against the source.
Snapshot and freshness
This skill is a dated snapshot of a fast-moving ecosystem, and a snapshot is technical debt: it ages. Treat it as a cache of the official docs, not an oracle.
- Snapshot date: 2026-06-05 (the
datein the frontmatter). Each notes file also carries its ownVerifieddate. - Staleness rule. If today is more than roughly 6 months past the snapshot date, or past a notes file's
Verifieddate, treat that file's version numbers and "current stable" claims as suspect. The paradigm sections (The shiftand the Start column) age far slower than version numbers, so trust those longer and verify the numbers. - Verify the one tool you are about to use. When a version-specific claim matters for the task, confirm it against that tool's official release notes or migration guide first. If you have web access and find an entry stale, apply the current paradigm and, if you maintain this repo, refresh the notes file.
Is the installed skill itself outdated?
Skills are distributed via skills.sh and copied into your project, so an installed copy is a pinned snapshot that does not update itself.
- Detect. Compare the snapshot date above to today. A gap of many months means the copy is likely behind newer releases, and several notes files probably are too.
- Update. Re-install the latest from the source, which overwrites the local copy:
npx skills@latest add saschb2b/skills --skill javascript-ecosystem - Confirm. Check that the snapshot date moved forward (
skills-lock.jsonrecords the new content hash). Maintainers: see MAINTENANCE.md.
What ships with it
60 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.
- _template.md 2.7 KB
- MAINTENANCE.md 2.5 KB
- references/ai-sdk/anthropic-sdk.md 2.5 KB
- references/ai-sdk/index.md 642 B
- references/ai-sdk/openai-sdk.md 2.4 KB
- references/ai-sdk/vercel-ai-sdk.md 2.5 KB
- references/api-codegen/graphql-codegen.md 3.0 KB
- references/api-codegen/hey-api.md 2.6 KB
- references/api-codegen/index.md 896 B
- references/api-codegen/openapi-fetch.md 2.6 KB
- references/api-codegen/orval.md 2.5 KB
- references/api-codegen/setup.md 12 KB
- references/auth/auth-js.md 2.3 KB
- references/auth/better-auth.md 2.4 KB
- references/auth/clerk.md 2.1 KB
- references/auth/index.md 685 B
- references/backend/drizzle.md 2.2 KB
- references/backend/express.md 1.9 KB
- references/backend/fastify.md 1.9 KB
- references/backend/hono.md 2.0 KB
- references/backend/index.md 1.2 KB
- references/backend/nitro.md 2.0 KB
- references/backend/prisma.md 2.6 KB
- references/backend/trpc.md 2.6 KB
- references/cms/index.md 491 B
- references/cms/payload.md 2.2 KB
- references/cms/sanity.md 2.0 KB
- references/cms/strapi.md 2.2 KB
- references/data/index.md 1.2 KB
- references/data/jotai.md 1.9 KB
- references/data/ngrx.md 2.5 KB
- references/data/pinia.md 1.9 KB
- references/data/redux-toolkit.md 2.2 KB
- references/data/swr.md 1.7 KB
- references/data/tanstack-query.md 2.1 KB
- references/data/zustand.md 1.9 KB
- references/dates/date-fns.md 2.0 KB
- references/dates/dayjs.md 2.0 KB
- references/dates/index.md 434 B
- references/dates/temporal.md 2.3 KB
- references/email/index.md 618 B
- references/email/nodemailer.md 2.0 KB
- references/email/react-email.md 2.0 KB
- references/email/resend.md 2.0 KB
- references/forms/index.md 445 B
- references/forms/react-hook-form.md 1.8 KB
- references/forms/tanstack-form.md 2.0 KB
- references/forms/zod.md 1.9 KB
- references/frameworks/angular.md 4.5 KB
- references/frameworks/index.md 804 B
- references/frameworks/react-rules.md 3.7 KB
- references/frameworks/react.md 3.0 KB
- references/frameworks/solid.md 2.0 KB
- references/frameworks/svelte.md 2.3 KB
- references/frameworks/vue.md 2.1 KB
- references/graphql/apollo-client.md 2.3 KB
- references/graphql/graphql-request.md 2.0 KB
- references/graphql/index.md 574 B
- references/graphql/urql.md 2.1 KB
- references/i18n/i18next.md 2.0 KB
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.
- 3d ago First seen · 283 lines · 179 tokens per session scan A 0b90a1835124
javascript-ecosystem is a skill published in the GitHub repository saschb2b/okf-studio (47 stars, last pushed yesterday), licensed MIT. It adds 179 tokens to every session and 5,586 once invoked, about $0.0007 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 2026-10-23.
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