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Foldkit

Foldkit is a TypeScript frontend framework built on Effect-TS that uses The Elm Architecture: a single Model, pure update, and side effects confined to Commands.

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For agents: Foldkit is a TypeScript frontend framework built on Effect-TS using The Elm Architecture; offers full docs, llms-full.txt, read-only content JSON API and OpenAP

typescript framework elm architecture effect-ts frontend framework coding agents

Authority: 45 reach 0 · trust 5 · quality 25 · freshness 15
Tier: listed
llms.txt: https://foldkit.dev/llms.txt
llms-full.txt: https://foldkit.dev/llms-full.txt
Sections: 15
Links: 222
Size: 38429 bytes
Country: United States Hosting inference
Hosting country: United States Hosting inference
Country evidence: No published address evidence collected yet
Categories: Developer tools · APIs and SDKs
For agents: Interface: a documented API or declared MCP endpoint an agent can call
Inferred actions: Read documentation Call an API Download data About these labels
Audience: developers · agents can: read docs, call api, download data · en
First seen: 2026-10-26T16:30:25.449Z
Last checked: 2026-10-27T15:30:45.634Z
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Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-26T16:30:25.454Z. Cached copy · Source on foldkit.dev

# Foldkit

> Foldkit is a TypeScript frontend framework built on Effect-TS that uses The Elm Architecture: a single Model, pure update, and side effects confined to Commands.

This index lists every page on the Foldkit documentation site with a short description. Every page is also available as Markdown by appending `.md` to its URL (e.g. https://foldkit.dev/get-started.md). A single-file concatenation of every page is available at https://foldkit.dev/llms-full.txt.

When to use Foldkit:

- Building a browser single-page application in TypeScript around The Elm Architecture: one Schema-defined Model, Messages as facts, a pure update function, and side effects confined to Commands.
- Extending a codebase that already uses Effect-TS, since Foldkit shares its idioms (Effect, Schema, Match, Option) and its ecosystem.
- Applications where agents write or audit significant code. Explicit state transitions and Messages-as-data make programs inspectable, and the Story and Scene test frameworks drive them without a browser.
- Not a fit for: server-only projects with no browser UI, teams staying on React and JSX idioms, or codebases avoiding the Effect ecosystem.

How an agent works with Foldkit:

- Scaffold a new application with `npm create foldkit-app@latest` (pnpm, yarn, and bun equivalents work too).
- Fetch any page below as Markdown by appending `.md` to its URL, or by requesting the page URL with `Accept: text/markdown`.
- Connect to a running app through the DevTools MCP server (`npx @foldkit/devtools-mcp init`) to inspect the Model, replay history, and dispatch Messages.
- Install the repository skills from https://foldkit.dev/ai/skills for architecture guidance, program generation, and application audits.

## Developer Resources

- [llms-full.txt](https://foldkit.dev/llms-full.txt): Every documentation page concatenated into one Markdown file.
- [Content API documentation](https://foldkit.dev/api): The read-only JSON API for this site: endpoints, authentication, versioning and deprecation policy, rate limit headers, and the error model.
- [Content API service index](https://foldkit.dev/api/v1): The endpoint list and policies as JSON. Pages, sections, examples, and blog posts hang off it.
- [openapi.json](https://foldkit.dev/openapi.json): OpenAPI 3.1 description of this site's machine-readable content endpoints, with a typed schema for every response.
- [Sitemap](https://foldkit.dev/sitemap.xml): Every page URL on the site.
- [AI overview](https://foldkit.dev/ai/overview): How Foldkit's explicit architecture supports coding agents, and the resources available to them.
- [Agent skills](https://foldkit.dev/ai/skills): Installable repository skills for architecture guidance, program generation, and application audits.
- [DevTools MCP server](https://foldkit.dev/ai/mcp): Connect an agent to a running Foldkit application. Published on npm as @foldkit/devtools-mcp.
- [GitHub repository](https://github.com/foldkit/foldkit): Source code, issues, and dis
…

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