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+---
+layout: doc
+title: Kubb Effect HttpApiClient Plugin
+description: Generates Effect v4 HttpApi contracts and a typed HttpApiClient from your OpenAPI specification.
+outline: deep
+kind: plugin
+id: plugin-effect-httpapiclient
+name: Effect HttpApiClient
+category: client
+type: official
+npmPackage: "@kubb/plugin-effect-httpapiclient"
+repo: https://github.com/kubb-labs/plugins
+docsPath: /plugins/plugin-effect-httpapiclient
+maintainers:
+  - name: Stijn Van Hulle
+    github: stijnvanhulle
+compatibility:
+  kubb: ">=5.0.0"
+  node: ">=22"
+tags:
+  - effect
+  - api-client
+  - http-api
+  - security
+  - codegen
+  - openapi
+dependencies:
+  - plugin-effect
+resources:
+  documentation: https://kubb.dev/plugins/plugin-effect-httpapiclient
+  repository: https://github.com/kubb-labs/plugins
+  issues: https://github.com/kubb-labs/plugins/issues
+  changelog: https://github.com/kubb-labs/plugins/blob/main/packages/plugin-effect-httpapiclient/CHANGELOG.md
+  codesandbox: https://codesandbox.io/p/github/kubb-labs/plugins/main/examples/effect-httpapiclient
+---
+
+# @kubb/plugin-effect-httpapiclient
+
+`@kubb/plugin-effect-httpapiclient` generates Effect `HttpApiEndpoint`, `HttpApiGroup`, and `HttpApi` contracts from OpenAPI. It also exports a typed `ApiClient` Effect created by `HttpApiClient.make`.
+
+The plugin uses schemas generated by [`@kubb/plugin-effect`](/plugins/plugin-effect/), so include both plugins in your configuration.
+
+> [!WARNING]
+> The first release targets `effect@4.0.0-beta.98`. Other Effect v4 beta releases and the future stable release may require changes to generated code.
+
+## Installation
+
+Install both Kubb plugins as development dependencies and Effect as an application dependency.
+
+::: code-group
+
+```shell [bun]
+bun add -d @kubb/plugin-effect@beta @kubb/plugin-effect-httpapiclient@beta
+bun add effect@4.0.0-beta.98
+```
+
+```shell [pnpm]
+pnpm add -D @kubb/plugin-effect@beta @kubb/plugin-effect-httpapiclient@beta
+pnpm add effect@4.0.0-beta.98
+```
+
+```shell [npm]
+npm install --save-dev @kubb/plugin-effect@beta @kubb/plugin-effect-httpapiclient@beta
+npm install effect@4.0.0-beta.98
+```
+
+```shell [yarn]
+yarn add -D @kubb/plugin-effect@beta @kubb/plugin-effect-httpapiclient@beta
+yarn add effect@4.0.0-beta.98
+```
+
+:::
+
+## Example
+
+Set `baseURL` to embed the service URL in the generated client. The default `mode: 'tag'` groups client methods by their first OpenAPI tag.
+
+```typescript twoslash [kubb.config.ts]
+import { pluginEffect } from '@kubb/plugin-effect'
+import { pluginEffectHttpApiClient } from '@kubb/plugin-effect-httpapiclient'
+import { defineConfig } from 'kubb/config'
+
+export default defineConfig({
+  input: './petStore.yaml',
+  output: { path: './src/gen' },
+  plugins: [
+    pluginEffect({ output: { path: 'effect' } }),
+    pluginEffectHttpApiClient({
+      output: { path: 'effectHttpApiClient' },
+      baseURL: 'https://petstore.example.com',
+    }),
+  ],
+})
+```
+
+Run the generated client as an Effect. Operations without a request body take `params`, `query`, and `headers` fields when their OpenAPI definition requires them. Operations with a body also take `payload`.
+
+```typescript [getPet.ts]
+import { Effect } from 'effect'
+import { ApiClient } from './gen/effectHttpApiClient'
+
+const getPet = Effect.gen(function* () {
+  const client = yield* ApiClient
+  return yield* client.pet.getPetById({ params: { petId: 10n } })
+})
+```
+
+Set `mode: 'flat'` to expose operation methods directly on the client instead of grouping them by tag.
+
+## Authentication
+
+OpenAPI security requirements become required client middleware. The generated `makeSecurityLayer` accepts static credentials and an optional dynamic resolver. Static credentials take precedence, while the resolver supports refreshed tokens and OAuth scopes at request time.
+
+```typescript [authenticated.ts]
+import { Effect, Redacted } from 'effect'
+import { ApiClient, makeSecurityLayer } from './gen/effectHttpApiClient'
+
+const apiKey = process.env.PETSTORE_API_KEY
+if (!apiKey) throw new Error('PETSTORE_API_KEY is required')
+
+const program = Effect.gen(function* () {
+  const client = yield* ApiClient
+  return yield* client.pet.getPetById({ params: { petId: 10n } })
+}).pipe(
+  Effect.provide(
+    makeSecurityLayer({
+      credentials: {
+        api_key: { _tag: 'ApiKey', value: Redacted.make(apiKey) },
+      },
+    }),
+  ),
+)
+```
+
+The middleware preserves OpenAPI security semantics:
+
+- Alternatives in the security array use OR semantics. The first complete alternative is applied.
+- Schemes in one requirement object use AND semantics.
+- Operation security replaces global security. An empty operation security array permits anonymous access.
+- OAuth and OpenID Connect schemes receive a bearer credential. The plugin passes declared scopes to the dynamic resolver but does not acquire tokens.
+
+If no alternative can be satisfied, the request fails with `MissingSecurityCredentials` before it reaches the HTTP transport. A dynamic resolver failure becomes `SecurityCredentialResolutionError`.
+
+## Content and data types
+
+The generated contract uses Effect's native HttpApi schema support for JSON, URL-encoded forms, multipart forms, text, binary bodies, and server-sent events. XML and unrecognized text media types use a string fallback. Other unknown media types use `Uint8Array`.
+
+When the OpenAPI adapter uses `dateType: 'date'`, a `date-time` schema decodes to Effect's `DateTime.Utc` type and encodes to a UTC ISO string.
+
+Regular cookie parameters are exposed under `headers.cookies`. OpenAPI API keys stored in cookies are added by the generated security middleware.
+
+## Current constraints
+
+- `default` responses are omitted because Effect HttpApi contracts require concrete status codes. Generation fails for other nonnumeric response keys.
+- The plugin generates client-side security middleware, not server-side authentication handlers.
+- The generated `ApiClient` uses the `baseURL` configured during generation. It does not generate a client factory for changing the URL at runtime.
+
+## See also
+
+- [Options](/plugins/plugin-effect-httpapiclient/reference/options)
+- [`@kubb/plugin-effect`](/plugins/plugin-effect/)
+- [Effect HttpApi](https://effect.website/docs/http/http-api/)
+- [Changelog](https://github.com/kubb-labs/plugins/blob/main/packages/plugin-effect-httpapiclient/CHANGELOG.md)
diff --git a/plugins/plugin-effect-httpapiclient/reference/options.md b/plugins/plugin-effect-httpapiclient/reference/options.md
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+---
+layout: doc
+title: Options
+description: Configuration options for @kubb/plugin-effect-httpapiclient.
+outline: deep
+---
+
+# Options
+
+`pluginEffectHttpApiClient` accepts the following options.
+
+| Option | Type | Default | Description |
+| ------ | ---- | ------- | ----------- |
+| [`output`](#output) | `Output` | `{ path: 'effectHttpApiClient', barrel: { type: 'named' } }` | Where the generated files are written and exported |
+| [`group`](#group) | `Group` | None | Split generated files into per-tag or per-path folders |
+| [`baseURL`](#baseurl) | `string` | None | Embed a fixed base URL in the generated client |
+| [`mode`](#mode) | `'tag' \| 'flat'` | `'tag'` | Group client methods by tag or expose them at the root |
+| [`include`](#include) | `Array<Include>` | None | Keep only operations that match |
+| [`exclude`](#exclude) | `Array<Exclude>` | `[]` | Skip operations that match |
+| [`override`](#override) | `Array<Override>` | `[]` | Apply different options per pattern |
+| [`resolver`](#resolver) | `ResolverPatch<ResolverEffectHttpApiClient>` | None | Customize generated names and file paths |
+| [`macros`](#macros) | `Array<Macro>` | None | Rewrite AST nodes before printing |
+
+### output
+
+Controls where the generated `.ts` files are written and how Kubb exports them.
+
+#### output.path
+
+The plugin resolves this folder against the global `output.path` from `defineConfig`.
+
+|           |                       |
+| --------: | :-------------------- |
+|     Type: | `string`              |
+| Required: | `false`               |
+|  Default: | `'effectHttpApiClient'` |
+
+#### output.barrel
+
+<!--@include: ../../../snippets/how-to/barrel.md-->
+
+#### output.banner
+
+<!--@include: ../../../snippets/how-to/output-banner.md-->
+
+#### output.footer
+
+<!--@include: ../../../snippets/how-to/output-footer.md-->
+
+### group
+
+<!--@include: ../../../snippets/how-to/grouping.md-->
+
+File grouping controls the output directory layout. It is separate from [`mode`](#mode), which controls the property layout on the generated `ApiClient`.
+
+#### group.type
+
+<!--@include: ../../../snippets/how-to/group-type.md-->
+
+#### group.name
+
+The function turns a tag or path key into the subdirectory under `output.path`.
+
+|           |                                          |
+| --------: | :--------------------------------------- |
+|     Type: | `(context: { group: string }) => string` |
+| Required: | `false`                                  |
+|  Default: | `({ group }) => camelCase(group)`        |
+
+### baseURL
+
+Embeds a fixed string in the generated `HttpApiClient.make(Api, { baseUrl })` call. The plugin does not generate a factory for selecting another URL at runtime.
+
+|           |           |
+| --------: | :-------- |
+|     Type: | `string`  |
+| Required: | `false`   |
+|  Default: | None      |
+
+### mode
+
+Controls the shape returned by the generated client Effect.
+
+- `'tag'` groups operations by their first OpenAPI tag. An operation without tags belongs to the `default` group.
+- `'flat'` adds every operation directly to the client root.
+
+|           |                   |
+| --------: | :---------------- |
+|     Type: | `'tag' \| 'flat'` |
+| Required: | `false`           |
+|  Default: | `'tag'`           |
+
+### include
+
+<!--@include: ../../../snippets/how-to/include.md-->
+
+### exclude
+
+<!--@include: ../../../snippets/how-to/exclude.md-->
+
+### override
+
+<!--@include: ../../../snippets/how-to/override.md-->
+
+### resolver
+
+Changes generated symbols and file paths. Methods omitted from the patch keep the default behavior.
+
+| Method | Purpose |
+| ------ | ------- |
+| `name(name)` | Resolve the shared base name |
+| `file(name)` | Resolve a generated file name |
+| `endpoint.name(operation)` | Resolve an exported endpoint constant |
+| `endpoint.identifier(operation)` | Resolve the operation property on the client |
+| `group.name(tag)` | Resolve an exported `HttpApiGroup` constant |
+| `group.identifier(tag)` | Resolve the group property on a tagged client |
+| `api.name()` | Resolve the root `HttpApi` constant |
+| `client.name()` | Resolve the generated client type and Effect value |
+
+```typescript [kubb.config.ts]
+import { pluginEffectHttpApiClient } from '@kubb/plugin-effect-httpapiclient'
+
+pluginEffectHttpApiClient({
+  resolver: {
+    client: {
+      name() {
+        return 'PetStoreClient'
+      },
+    },
+  },
+})
+```
+
+See [Override a resolver](/docs/5.x/guide/going-further/resolvers) for the resolver context.
+
+### macros
+
+<!--@include: ../../../snippets/how-to/macros-option.md-->
diff --git a/plugins/plugin-effect/index.md b/plugins/plugin-effect/index.md
new file mode 100644
index 00000000..a84a7cd9
--- /dev/null
+++ b/plugins/plugin-effect/index.md
@@ -0,0 +1,117 @@
+---
+layout: doc
+title: Kubb Effect Plugin
+description: Generates Effect v4 schemas and matching TypeScript types from your OpenAPI specification.
+outline: deep
+kind: plugin
+id: plugin-effect
+name: Effect
+category: validation
+type: official
+npmPackage: "@kubb/plugin-effect"
+repo: https://github.com/kubb-labs/plugins
+docsPath: /plugins/plugin-effect
+maintainers:
+  - name: Stijn Van Hulle
+    github: stijnvanhulle
+compatibility:
+  kubb: ">=5.0.0"
+  node: ">=22"
+tags:
+  - effect
+  - validation
+  - schema
+  - runtime-validation
+  - codegen
+  - openapi
+dependencies: []
+resources:
+  documentation: https://kubb.dev/plugins/plugin-effect
+  repository: https://github.com/kubb-labs/plugins
+  issues: https://github.com/kubb-labs/plugins/issues
+  changelog: https://github.com/kubb-labs/plugins/blob/main/packages/plugin-effect/CHANGELOG.md
+  codesandbox: https://codesandbox.io/p/github/kubb-labs/plugins/main/examples/effect
+---
+
+# @kubb/plugin-effect
+
+`@kubb/plugin-effect` generates [Effect](https://effect.website/) v4 schemas and matching TypeScript types from OpenAPI. Each schema uses the same PascalCase name in the type and value namespaces.
+
+```typescript [Pet.ts]
+import * as Schema from 'effect/Schema'
+
+export type Pet = {
+  readonly id: number
+  readonly name: string
+}
+
+export const Pet = Schema.Struct({
+  id: Schema.Int,
+  name: Schema.String,
+})
+```
+
+> [!WARNING]
+> The first release targets `effect@4.0.0-beta.98`. Other Effect v4 beta releases and the future stable release may require changes to generated code.
+
+## Installation
+
+Install the plugin as a development dependency and Effect as an application dependency.
+
+::: code-group
+
+```shell [bun]
+bun add -d @kubb/plugin-effect@beta
+bun add effect@4.0.0-beta.98
+```
+
+```shell [pnpm]
+pnpm add -D @kubb/plugin-effect@beta
+pnpm add effect@4.0.0-beta.98
+```
+
+```shell [npm]
+npm install --save-dev @kubb/plugin-effect@beta
+npm install effect@4.0.0-beta.98
+```
+
+```shell [yarn]
+yarn add -D @kubb/plugin-effect@beta
+yarn add effect@4.0.0-beta.98
+```
+
+:::
+
+## Example
+
+The plugin emits types itself, so it can replace `@kubb/plugin-ts` when Effect schemas are the source of truth.
+
+```typescript twoslash [kubb.config.ts]
+import { pluginEffect } from '@kubb/plugin-effect'
+import { defineConfig } from 'kubb'
+
+export default defineConfig({
+  input: './petStore.yaml',
+  output: { path: './src/gen' },
+  plugins: [
+    pluginEffect({
+      output: { path: './effect' },
+    }),
+  ],
+})
+```
+
+> [!IMPORTANT]
+> Do not write the default `pluginEffect()` and `pluginTs()` outputs into the same barrel. Both plugins export names such as `Pet`. Use separate output paths or add a suffix with `resolver` when one project needs both sets of types.
+
+## Runtime behavior
+
+OpenAPI length, range, pattern, uniqueness, and `oneOf` rules become Effect checks. OpenAPI `format` and `default` values become schema annotations. A format such as `email` does not reject a string, and a default does not fill a missing value.
+
+When the OpenAPI adapter uses `dateType: 'date'`, generated codecs decode `date-time` strings into `DateTime.Utc` values and encode them as UTC ISO strings. Date-only fields preserve their `YYYY-MM-DD` wire format, while the default string representation keeps both formats as annotated strings. JSON `int64` values decode from numbers to `bigint` values.
+
+## See also
+
+- [Effect Schema](https://effect.website/docs/schema/introduction/)
+- [Options](/plugins/plugin-effect/reference/options)
+- [Changelog](https://github.com/kubb-labs/plugins/blob/main/packages/plugin-effect/CHANGELOG.md)
diff --git a/plugins/plugin-effect/reference/options.md b/plugins/plugin-effect/reference/options.md
new file mode 100644
index 00000000..ad0ed6cf
--- /dev/null
+++ b/plugins/plugin-effect/reference/options.md
@@ -0,0 +1,164 @@
+---
+layout: doc
+title: Options
+description: Configuration options for @kubb/plugin-effect.
+outline: deep
+---
+
+# Options
+
+`pluginEffect` accepts the following options.
+
+| Option | Type | Default | Description |
+| ------ | ---- | ------- | ----------- |
+| [`output`](#output) | `Output` | `{ path: 'effect', barrel: { type: 'named' } }` | Where the generated files are written and exported |
+| [`group`](#group) | `Group` | None | Split output into per-tag or per-path folders |
+| [`importPath`](#importpath) | `string` | `'effect/Schema'` | Module used for the generated Schema namespace import |
+| [`regexType`](#regextype) | `'literal' \| 'constructor'` | `'constructor'` | How an OpenAPI `pattern` is written |
+| [`include`](#include) | `Array<Include>` | None | Keep only operations that match |
+| [`exclude`](#exclude) | `Array<Exclude>` | None | Skip operations that match |
+| [`override`](#override) | `Array<Override>` | None | Apply different options per pattern |
+| [`resolver`](#resolver) | `ResolverPatch<ResolverEffect>` | None | Customize generated names and file paths |
+| [`printer`](#printer) | `{ nodes?: PrinterEffectNodes }` | None | Replace the handler for a schema type |
+| [`macros`](#macros) | `Array<Macro>` | None | Rewrite AST nodes before printing |
+
+### output
+
+Controls where the generated `.ts` files are written and how Kubb exports them.
+
+#### output.path
+
+The plugin resolves this folder against the global `output.path` from `defineConfig`. For one generated file, set `output.mode: 'file'` and include a `.ts` extension.
+
+|          |            |
+| -------: | :--------- |
+|    Type: | `string`   |
+| Required: | `false`   |
+| Default: | `'effect'` |
+
+#### output.mode
+
+`'directory'` writes one file per operation or component. `'file'` combines the generated schemas in the file named by `output.path`.
+
+|           |                         |
+| --------: | :---------------------- |
+|     Type: | `'directory' \| 'file'` |
+| Required: | `false`                 |
+|  Default: | `'directory'`           |
+
+#### output.barrel
+
+<!--@include: ../../../snippets/how-to/barrel.md-->
+
+#### output.banner
+
+<!--@include: ../../../snippets/how-to/output-banner.md-->
+
+#### output.footer
+
+<!--@include: ../../../snippets/how-to/output-footer.md-->
+
+### group
+
+<!--@include: ../../../snippets/how-to/grouping.md-->
+
+#### group.type
+
+<!--@include: ../../../snippets/how-to/group-type.md-->
+
+#### group.name
+
+The function turns a tag or path key into the subdirectory under `output.path`.
+
+|           |                                          |
+| --------: | :--------------------------------------- |
+|     Type: | `(context: { group: string }) => string` |
+| Required: | `false`                                  |
+|  Default: | `({ group }) => camelCase(group)`        |
+
+### importPath
+
+Sets the module specifier for `import * as Schema from '...'` in generated files. A custom module must export the Effect Schema API as a namespace-compatible module.
+
+|           |                     |
+| --------: | :------------------ |
+|     Type: | `string`            |
+| Required: | `false`             |
+|  Default: | `'effect/Schema'`   |
+
+### regexType
+
+Controls the source emitted for OpenAPI `pattern` checks.
+
+- `'constructor'` emits `new RegExp('^[a-z]+$')` and is the default.
+- `'literal'` emits `/^[a-z]+$/`.
+
+|           |                              |
+| --------: | :--------------------------- |
+|     Type: | `'literal' \| 'constructor'` |
+| Required: | `false`                      |
+|  Default: | `'constructor'`              |
+
+### include
+
+<!--@include: ../../../snippets/how-to/include.md-->
+
+### exclude
+
+<!--@include: ../../../snippets/how-to/exclude.md-->
+
+### override
+
+<!--@include: ../../../snippets/how-to/override.md-->
+
+### resolver
+
+Changes generated symbols and file paths. Methods omitted from the patch keep the behavior from `resolverEffect`.
+
+The default resolver intentionally uses names such as `Pet` for both the schema and the type. Add a suffix if the same barrel also exports `plugin-ts` output.
+
+```typescript [kubb.config.ts]
+import { pluginEffect } from '@kubb/plugin-effect'
+
+pluginEffect({
+  resolver: {
+    name(name) {
+      return `${this.default.name(name)}Effect`
+    },
+  },
+})
+```
+
+See [Override a resolver](/docs/5.x/guide/going-further/resolvers) for the resolver context.
+
+### printer
+
+Replaces the handler for a schema node type. Every handler returns the runtime expression, decoded type, and encoded type so the three representations cannot drift apart.
+
+`this.base(node)` returns the built-in result. `this.transform(node)` prints a nested node.
+
+```typescript [kubb.config.ts]
+import { pluginEffect } from '@kubb/plugin-effect'
+
+pluginEffect({
+  printer: {
+    nodes: {
+      string(node) {
+        const base = this.base(node)
+        if (!base) return null
+
+        return {
+          ...base,
+          runtime: `${base.runtime}.annotate({ title: 'Custom string' })`,
+        }
+      },
+    },
+  },
+})
+```
+
+See the [printer guide](/docs/5.x/guide/going-further/printers) for the complete handler contract.
+
+### macros
+
+<!--@include: ../../../snippets/how-to/macros-option.md-->