encore-frontend: Coding Workflows for AI Agents | OpenAgentSkill

Overview

Connect a frontend application (React, Next.js, Vue, Svelte, etc.) to an Encore.ts backend.

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Frontend Integration with Encore

Instructions

Encore provides tools to connect your frontend applications to your backend APIs.

Generate a TypeScript Client

# Generate client for local development
encore gen client --output=./frontend/src/client.ts --env=local

# Generate client for a deployed environment
encore gen client --output=./frontend/src/client.ts --env=staging

This generates a fully typed client based on your API definitions.

Using the Generated Client

// frontend/src/client.ts is auto-generated
import Client from "./client";

const client = new Client("http://localhost:4000");

// Fully typed API calls
const user = await client.user.getUser({ id: "123" });
console.log(user.email);

const newUser = await client.user.createUser({
  email: "new@example.com",
  name: "New User",
});

React Example

// frontend/src/components/UserProfile.tsx
import { useState, useEffect } from "react";
import Client from "../client";

const client = new Client(import.meta.env.VITE_API_URL);

export function UserProfile({ userId }: { userId: string }) {
  const [user, setUser] = useState(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(null);

  useEffect(() => {
    client.user.getUser({ id: userId })
      .then(setUser)
      .catch(setError)
      .finally(() => setLoading(false));
  }, [userId]);

  if (loading) return <div>Loading...</div>;
  if (error) return <div>Error: {error.message}</div>;
  
  return (
    <div>
      <h1>{user.name}</h1>
      <p>{user.email}</p>
    </div>
  );
}

React with TanStack Query

import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
import Client from "../client";

const client = new Client(import.meta.env.VITE_API_URL);

export function UserProfile({ userId }: { userId: string }) {
  const { data: user, isLoading, error } = useQuery({
    queryKey: ["user", userId],
    queryFn: () => client.user.getUser({ id: userId }),
  });

  if (isLoading) return <div>Loading...</div>;
  if (error) return <div>Error: {error.message}</div>;
  
  return <div>{user.name}</div>;
}

export function CreateUserForm() {
  const queryClient = useQueryClient();
  
  const mutation = useMutation({
    mutationFn: (data: { email: string; name: string }) => 
      client.user.createUser(data),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ["users"] });
    },
  });

  const handleSubmit = (e: React.FormEvent<HTMLFormElement>) => {
    e.preventDefault();
    const formData = new FormData(e.currentTarget);
    mutation.mutate({
      email: formData.get("email") as string,
      name: formData.get("name") as string,
    });
  };

  return (
    <form onSubmit={handleSubmit}>
      <input name="email" type="email" required />
      <input name="name" required />
      <button type="submit" disabled={mutation.isPending}>
        {mutation.isPending ? "Creating..." : "Create User"}
      </button>
    </form>
  );
}

Next.js Server Components

// app/users/[id]/page.tsx
import Client from "@/lib/client";

const client = new Client(process.env.API_URL);

export default async function UserPage({ params }: { params: { id: string } }) {
  const user = await client.user.getUser({ id: params.id });
  
  return (
    <div>
      <h1>{user.name}</h1>
      <p>{user.email}</p>
    </div>
  );
}

CORS Configuration

Configure CORS in your encore.app file:

{
    "id": "my-app",
    "global_cors": {
        "allow_origins_with_credentials": [
            "http://localhost:3000",
            "https://myapp.com",
            "https://*.myapp.com"
        ]
    }
}

CORS Options

Option	Description
`allow_origins_without_credentials`	Origins allowed for non-credentialed requests (default: `["*"]`)
`allow_origins_with_credentials`	Origins allowed for credentialed requests (cookies, auth headers)
`allow_headers`	Additional request headers to allow
`expose_headers`	Additional response headers to expose
`debug`	Enable CORS debug logging

Authentication from Frontend

For authenticated requests, pass the Authorization header:

// Using fetch
const response = await fetch("http://localhost:4000/profile", {
  headers: {
    "Authorization": `Bearer ${token}`,
  },
});

// Or include credentials for cookie-based auth
const response = await fetch("http://localhost:4000/profile", {
  credentials: "include",
});

With TanStack Query, configure a default fetcher:

const queryClient = new QueryClient({
  defaultOptions: {
    queries: {
      queryFn: async ({ queryKey }) => {
        const response = await fetch(queryKey[0] as string, {
          headers: { Authorization: `Bearer ${getToken()}` },
        });
        if (!response.ok) throw new Error("Request failed");
        return response.json();
      },
    },
  },
});

Using Plain Fetch

If you prefer not to use the generated client:

async function getUser(id: string) {
  const response = await fetch(`http://localhost:4000/users/${id}`);
  if (!response.ok) {
    throw new Error(`HTTP error: ${response.status}`);
  }
  return response.json();
}

async function createUser(email: string, name: string) {
  const response = await fetch("http://localhost:4000/users", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ email, name }),
  });
  if (!response.ok) {
    throw new Error(`HTTP error: ${response.status}`);
  }
  return response.json();
}

Environment Variables

# .env.local (Next.js)
NEXT_PUBLIC_API_URL=http://localhost:4000

# .env (Vite)
VITE_API_URL=http://localhost:4000

Guidelines

Use encore gen client to generate typed API clients
Regenerate the client when your API changes
Configure CORS in encore.app for production domains
Use allow_origins_with_credentials for authenticated requests
Include Authorization header for token-based auth
Use credentials: "include" for cookie-based auth
Use environment variables for API URLs (different per environment)
The generated client handles errors and types automatically

View source ↗

File metadata

name: encore-frontend
description: Connect a frontend application (React, Next.js, Vue, Svelte, etc.) to an Encore.ts backend.
when_to_use: >-
  User wants to generate a TypeScript API client for the browser (`encore gen client`), call Encore endpoints from React/Next.js/Vue/Svelte/SvelteKit/Remix/Astro, configure CORS in `encore.app`, or wire authentication tokens through a generated client. Trigger phrases: "TypeScript client", "API client", "Next.js frontend", "React frontend", "encore gen client", "CORS", "browser fetch", "SPA", "frontend can call this backend".

View original text

---
name: encore-frontend
description: Connect a frontend application (React, Next.js, Vue, Svelte, etc.) to an Encore.ts backend.
when_to_use: >-
  User wants to generate a TypeScript API client for the browser (`encore gen client`), call Encore endpoints from React/Next.js/Vue/Svelte/SvelteKit/Remix/Astro, configure CORS in `encore.app`, or wire authentication tokens through a generated client. Trigger phrases: "TypeScript client", "API client", "Next.js frontend", "React frontend", "encore gen client", "CORS", "browser fetch", "SPA", "frontend can call this backend".
---

# Frontend Integration with Encore

## Instructions

Encore provides tools to connect your frontend applications to your backend APIs.

### Generate a TypeScript Client

```bash
# Generate client for local development
encore gen client --output=./frontend/src/client.ts --env=local

# Generate client for a deployed environment
encore gen client --output=./frontend/src/client.ts --env=staging
```

This generates a fully typed client based on your API definitions.

### Using the Generated Client

```typescript
// frontend/src/client.ts is auto-generated
import Client from "./client";

const client = new Client("http://localhost:4000");

// Fully typed API calls
const user = await client.user.getUser({ id: "123" });
console.log(user.email);

const newUser = await client.user.createUser({
  email: "new@example.com",
  name: "New User",
});
```

### React Example

```tsx
// frontend/src/components/UserProfile.tsx
import { useState, useEffect } from "react";
import Client from "../client";

const client = new Client(import.meta.env.VITE_API_URL);

export function UserProfile({ userId }: { userId: string }) {
  const [user, setUser] = useState(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(null);

  useEffect(() => {
    client.user.getUser({ id: userId })
      .then(setUser)
      .catch(setError)
      .finally(() => setLoading(false));
  }, [userId]);

  if (loading) return <div>Loading...</div>;
  if (error) return <div>Error: {error.message}</div>;
  
  return (
    <div>
      <h1>{user.name}</h1>
      <p>{user.email}</p>
    </div>
  );
}
```

### React with TanStack Query

```tsx
import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
import Client from "../client";

const client = new Client(import.meta.env.VITE_API_URL);

export function UserProfile({ userId }: { userId: string }) {
  const { data: user, isLoading, error } = useQuery({
    queryKey: ["user", userId],
    queryFn: () => client.user.getUser({ id: userId }),
  });

  if (isLoading) return <div>Loading...</div>;
  if (error) return <div>Error: {error.message}</div>;
  
  return <div>{user.name}</div>;
}

export function CreateUserForm() {
  const queryClient = useQueryClient();
  
  const mutation = useMutation({
    mutationFn: (data: { email: string; name: string }) => 
      client.user.createUser(data),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ["users"] });
    },
  });

  const handleSubmit = (e: React.FormEvent<HTMLFormElement>) => {
    e.preventDefault();
    const formData = new FormData(e.currentTarget);
    mutation.mutate({
      email: formData.get("email") as string,
      name: formData.get("name") as string,
    });
  };

  return (
    <form onSubmit={handleSubmit}>
      <input name="email" type="email" required />
      <input name="name" required />
      <button type="submit" disabled={mutation.isPending}>
        {mutation.isPending ? "Creating..." : "Create User"}
      </button>
    </form>
  );
}
```

### Next.js Server Components

```tsx
// app/users/[id]/page.tsx
import Client from "@/lib/client";

const client = new Client(process.env.API_URL);

export default async function UserPage({ params }: { params: { id: string } }) {
  const user = await client.user.getUser({ id: params.id });
  
  return (
    <div>
      <h1>{user.name}</h1>
      <p>{user.email}</p>
    </div>
  );
}
```

### CORS Configuration

Configure CORS in your `encore.app` file:

```json
{
    "id": "my-app",
    "global_cors": {
        "allow_origins_with_credentials": [
            "http://localhost:3000",
            "https://myapp.com",
            "https://*.myapp.com"
        ]
    }
}
```

### CORS Options

| Option | Description |
|--------|-------------|
| `allow_origins_without_credentials` | Origins allowed for non-credentialed requests (default: `["*"]`) |
| `allow_origins_with_credentials` | Origins allowed for credentialed requests (cookies, auth headers) |
| `allow_headers` | Additional request headers to allow |
| `expose_headers` | Additional response headers to expose |
| `debug` | Enable CORS debug logging |

### Authentication from Frontend

For authenticated requests, pass the Authorization header:

```typescript
// Using fetch
const response = await fetch("http://localhost:4000/profile", {
  headers: {
    "Authorization": `Bearer ${token}`,
  },
});

// Or include credentials for cookie-based auth
const response = await fetch("http://localhost:4000/profile", {
  credentials: "include",
});
```

With TanStack Query, configure a default fetcher:

```typescript
const queryClient = new QueryClient({
  defaultOptions: {
    queries: {
      queryFn: async ({ queryKey }) => {
        const response = await fetch(queryKey[0] as string, {
          headers: { Authorization: `Bearer ${getToken()}` },
        });
        if (!response.ok) throw new Error("Request failed");
        return response.json();
      },
    },
  },
});
```

### Using Plain Fetch

If you prefer not to use the generated client:

```typescript
async function getUser(id: string) {
  const response = await fetch(`http://localhost:4000/users/${id}`);
  if (!response.ok) {
    throw new Error(`HTTP error: ${response.status}`);
  }
  return response.json();
}

async function createUser(email: string, name: string) {
  const response = await fetch("http://localhost:4000/users", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ email, name }),
  });
  if (!response.ok) {
    throw new Error(`HTTP error: ${response.status}`);
  }
  return response.json();
}
```

### Environment Variables

```bash
# .env.local (Next.js)
NEXT_PUBLIC_API_URL=http://localhost:4000

# .env (Vite)
VITE_API_URL=http://localhost:4000
```

### Guidelines

- Use `encore gen client` to generate typed API clients
- Regenerate the client when your API changes
- Configure CORS in `encore.app` for production domains
- Use `allow_origins_with_credentials` for authenticated requests
- Include `Authorization` header for token-based auth
- Use `credentials: "include"` for cookie-based auth
- Use environment variables for API URLs (different per environment)
- The generated client handles errors and types automatically

Review the source

Skill source recorded

Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

License: Apache-2.0

Dependency or permission surface needs review
Permission surface may require sandboxing
Financial research output is not financial advice; require human review before any live investment decision
No explicit 'when not to use' or limitations section, which could lead to misuse in non-TypeScript or non-browser contexts.
Low GitHub adoption signal
Financial research output is not financial advice; require human review before any live investment decision.
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
GitHub adoption: 26 GitHub stars
Stars/forks activity: 26 stars, 5 forks; issue activity unavailable in current metadata
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

Open full audit

Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.

Start with one small task

Source & usage notes

IndexedAI Reviewed

Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.

Source repository: encoredev/skills
License: Apache-2.0
Version: Unknown
Last GitHub push: Sep 4, 2026
Registry updated: Sep 13, 2026
Instruction path: encore/frontend/SKILL.md @ 741d95a38b44

Version reported in registry metadata; check source releases before relying on it.

Quality

61/100

Promising

Trust

58/100

Agent access

This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.

Open install API LLM text format Open manifest Auto-resolve Plan

More details

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      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, shell or command execution"
    ]
  },
  "safety_gate": {
    "tier": "blocked",
    "label": "Blocked for auto-install",
    "auto_install_policy": "block",
    "auto_install_allowed": false,
    "human_review_required": true,
    "blocked": true,
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
  },
  "quality": {
    "score": 61,
    "label": "Promising"
  },
  "supply": {
    "track": "Coding and developer agents",
    "scenario": "Coding agents",
    "maintenance": "21d since push",
    "risk": "Needs review"
  },
  "alternative_skills": [
    {
      "slug": "vercel-react-best-practices",
      "name": "Vercel React Best Practices",
      "url": "https://www.openagentskill.com/skills/vercel-react-best-practices",
      "stars": 31515,
      "install_command": "",
      "trust_score": 94,
      "audit_score": 96
    }
  ],
  "do_not_use_when": [
    "teams that need a vendor-supported SLA",
    "production agents without a repository review",
    "Low GitHub adoption signal",
    "No explicit 'when not to use' or limitations section, which could lead to misuse in non-TypeScript or non-browser contexts.",
    "High-risk permission hints: Shell or command execution, Secrets or environment access",
    "Dependency or permission surface needs review",
    "Permission surface may require sandboxing",
    "Financial research output is not financial advice; require human review before any live investment decision"
  ],
  "agent_contract": {
    "task_input": "Use encore-frontend in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 66/100 Manual review",
      "Audit: 73/100 Needs review",
      "Safety: 25/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "encoredev-encore-frontend (encore-frontend)",
      "install_command": "npx skills add encoredev/skills --skill encore-frontend",
      "risk_summary": "Needs review; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "encoredev-encore-frontend",
      "task": "Use encore-frontend in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/encoredev-encore-frontend",
    "api": "https://www.openagentskill.com/api/agent/skills/encoredev-encore-frontend",
    "audit": "https://www.openagentskill.com/skills/encoredev-encore-frontend/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=encoredev-encore-frontend&task=Use%20encore-frontend%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20encore-frontend%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20encore-frontend%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/encoredev-encore-frontend/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/encoredev-encore-frontend"
  }
}

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Creator: encoredev
Source: encoredev/skills
Indexed by: OpenAgentSkill community index

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