actix-web: Design & UI for AI Agents | OpenAgentSkill

Overview

Actix Web is a powerful, high-performance web framework for Rust. It provides async handlers, type-safe extractors, middleware, and integrates with the Rust ecosystem for building fast, reliable, and memory-safe web services.

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Actix Web

Actix Web is one of the fastest web frameworks available. It uses Rust's type system for compile-time safety, async/await for concurrency, and extractors for ergonomic request handling.

Installation

# Cargo.toml — dependencies
[dependencies]
actix-web = "4"
actix-rt = "2"
serde = { version = "1", features = ["derive"] }
serde_json = "1"
sqlx = { version = "0.7", features = ["runtime-tokio", "postgres", "macros"] }
tokio = { version = "1", features = ["full"] }
env_logger = "0.11"

Project Structure

# Recommended Actix Web project layout
src/
├── main.rs              # Entry point and server config
├── config.rs            # Configuration
├── routes/
│   ├── mod.rs           # Route registration
│   ├── articles.rs      # Article handlers
│   └── health.rs        # Health check
├── models/
│   └── article.rs       # Data structures
├── db/
│   └── article.rs       # Database queries
├── middleware/
│   └── auth.rs          # Auth middleware
└── errors.rs            # Error types

Main and Server Setup

// src/main.rs — application entry point
use actix_web::{web, App, HttpServer, middleware::Logger};
use sqlx::postgres::PgPoolOptions;

mod routes;
mod models;
mod db;
mod errors;

#[actix_web::main]
async fn main() -> std::io::Result<()> {
    env_logger::init();

    let database_url = std::env::var("DATABASE_URL")
        .unwrap_or_else(|_| "postgres://localhost/mydb".to_string());

    let pool = PgPoolOptions::new()
        .max_connections(10)
        .connect(&database_url)
        .await
        .expect("Failed to create pool");

    HttpServer::new(move || {
        App::new()
            .wrap(Logger::default())
            .app_data(web::Data::new(pool.clone()))
            .configure(routes::configure)
    })
    .bind("0.0.0.0:8080")?
    .run()
    .await
}

Route Configuration

// src/routes/mod.rs — centralized route registration
use actix_web::web;

mod articles;
mod health;

pub fn configure(cfg: &mut web::ServiceConfig) {
    cfg.service(
        web::scope("/api")
            .route("/health", web::get().to(health::check))
            .service(
                web::scope("/articles")
                    .route("", web::get().to(articles::list))
                    .route("", web::post().to(articles::create))
                    .route("/{id}", web::get().to(articles::get))
                    .route("/{id}", web::delete().to(articles::delete))
            )
    );
}

Models

// src/models/article.rs — data models with serde
use serde::{Deserialize, Serialize};
use sqlx::FromRow;

#[derive(Debug, Serialize, FromRow)]
pub struct Article {
    pub id: i32,
    pub title: String,
    pub body: String,
    pub published: bool,
    pub created_at: chrono::NaiveDateTime,
}

#[derive(Debug, Deserialize)]
pub struct CreateArticle {
    pub title: String,
    pub body: String,
}

#[derive(Debug, Deserialize)]
pub struct ListParams {
    pub page: Option<u32>,
    pub limit: Option<u32>,
}

Handlers with Extractors

// src/routes/articles.rs — request handlers
use actix_web::{web, HttpResponse};
use sqlx::PgPool;
use crate::models::article::{Article, CreateArticle, ListParams};
use crate::errors::AppError;

pub async fn list(
    pool: web::Data<PgPool>,
    query: web::Query<ListParams>,
) -> Result<HttpResponse, AppError> {
    let limit = query.limit.unwrap_or(20).min(100) as i64;
    let offset = ((query.page.unwrap_or(1) - 1) * limit as u32) as i64;

    let articles = sqlx::query_as::<_, Article>(
        "SELECT * FROM articles WHERE published = true ORDER BY created_at DESC LIMIT $1 OFFSET $2"
    )
    .bind(limit)
    .bind(offset)
    .fetch_all(pool.get_ref())
    .await?;

    Ok(HttpResponse::Ok().json(articles))
}

pub async fn create(
    pool: web::Data<PgPool>,
    body: web::Json<CreateArticle>,
) -> Result<HttpResponse, AppError> {
    let article = sqlx::query_as::<_, Article>(
        "INSERT INTO articles (title, body) VALUES ($1, $2) RETURNING *"
    )
    .bind(&body.title)
    .bind(&body.body)
    .fetch_one(pool.get_ref())
    .await?;

    Ok(HttpResponse::Created().json(article))
}

pub async fn get(
    pool: web::Data<PgPool>,
    path: web::Path<i32>,
) -> Result<HttpResponse, AppError> {
    let id = path.into_inner();
    let article = sqlx::query_as::<_, Article>("SELECT * FROM articles WHERE id = $1")
        .bind(id)
        .fetch_optional(pool.get_ref())
        .await?
        .ok_or(AppError::NotFound)?;

    Ok(HttpResponse::Ok().json(article))
}

Error Handling

// src/errors.rs — custom error types
use actix_web::{HttpResponse, ResponseError};
use std::fmt;

#[derive(Debug)]
pub enum AppError {
    NotFound,
    Internal(String),
    Database(sqlx::Error),
}

impl fmt::Display for AppError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            AppError::NotFound => write!(f, "Not found"),
            AppError::Internal(msg) => write!(f, "{}", msg),
            AppError::Database(e) => write!(f, "Database error: {}", e),
        }
    }
}

impl ResponseError for AppError {
    fn error_response(&self) -> HttpResponse {
        match self {
            AppError::NotFound => HttpResponse::NotFound().json(serde_json::json!({"error": "not found"})),
            _ => HttpResponse::InternalServerError().json(serde_json::json!({"error": "internal error"})),
        }
    }
}

impl From<sqlx::Error> for AppError {
    fn from(e: sqlx::Error) -> Self { AppError::Database(e) }
}

Middleware

// src/middleware/auth.rs — simple auth middleware
use actix_web::{dev::ServiceRequest, Error, HttpMessage};
use actix_web::error::ErrorUnauthorized;

pub async fn validate_token(req: &ServiceRequest) -> Result<(), Error> {
    let token = req.headers()
        .get("Authorization")
        .and_then(|v| v.to_str().ok())
        .and_then(|v| v.strip_prefix("Bearer "));

    match token {
        Some(t) => {
            let user_id = verify_jwt(t).map_err(|_| ErrorUnauthorized("invalid token"))?;
            req.extensions_mut().insert(user_id);
            Ok(())
        }
        None => Err(ErrorUnauthorized("missing token")),
    }
}

Testing

// tests/articles_test.rs — integration test
use actix_web::{test, App, web};

#[actix_web::test]
async fn test_list_articles() {
    let pool = setup_test_db().await;
    let app = test::init_service(
        App::new()
            .app_data(web::Data::new(pool))
            .configure(routes::configure)
    ).await;

    let req = test::TestRequest::get().uri("/api/articles").to_request();
    let resp = test::call_service(&app, req).await;
    assert_eq!(resp.status(), 200);
}

Key Patterns

Use extractors (web::Json, web::Path, web::Query, web::Data) for type-safe request parsing
Implement ResponseError on custom error types for automatic HTTP error responses
Use web::Data for shared application state (DB pool, config) — it's cheaply cloneable
Use sqlx with compile-time checked queries (sqlx::query!) for production code
Use configure functions to modularize route registration
Use #[actix_web::test] for async integration tests with test::init_service

View source ↗

File metadata

name: actix-web
description: |
  Actix Web is a powerful, high-performance web framework for Rust. It provides
  async handlers, type-safe extractors, middleware, and integrates with the Rust
  ecosystem for building fast, reliable, and memory-safe web services.
license: Apache-2.0
compatibility: 'rust >= 1.72, cargo'
metadata:
  author: terminal-skills
  version: 1.0.0
  category: development
  tags:
    - rust
    - web
    - api
    - async
    - performance
    - type-safe

View original text

---
name: actix-web
description: |
  Actix Web is a powerful, high-performance web framework for Rust. It provides
  async handlers, type-safe extractors, middleware, and integrates with the Rust
  ecosystem for building fast, reliable, and memory-safe web services.
license: Apache-2.0
compatibility: 'rust >= 1.72, cargo'
metadata:
  author: terminal-skills
  version: 1.0.0
  category: development
  tags:
    - rust
    - web
    - api
    - async
    - performance
    - type-safe
---

# Actix Web

Actix Web is one of the fastest web frameworks available. It uses Rust's type system for compile-time safety, async/await for concurrency, and extractors for ergonomic request handling.

## Installation

```toml
# Cargo.toml — dependencies
[dependencies]
actix-web = "4"
actix-rt = "2"
serde = { version = "1", features = ["derive"] }
serde_json = "1"
sqlx = { version = "0.7", features = ["runtime-tokio", "postgres", "macros"] }
tokio = { version = "1", features = ["full"] }
env_logger = "0.11"
```

## Project Structure

```
# Recommended Actix Web project layout
src/
├── main.rs              # Entry point and server config
├── config.rs            # Configuration
├── routes/
│   ├── mod.rs           # Route registration
│   ├── articles.rs      # Article handlers
│   └── health.rs        # Health check
├── models/
│   └── article.rs       # Data structures
├── db/
│   └── article.rs       # Database queries
├── middleware/
│   └── auth.rs          # Auth middleware
└── errors.rs            # Error types
```

## Main and Server Setup

```rust
// src/main.rs — application entry point
use actix_web::{web, App, HttpServer, middleware::Logger};
use sqlx::postgres::PgPoolOptions;

mod routes;
mod models;
mod db;
mod errors;

#[actix_web::main]
async fn main() -> std::io::Result<()> {
    env_logger::init();

    let database_url = std::env::var("DATABASE_URL")
        .unwrap_or_else(|_| "postgres://localhost/mydb".to_string());

    let pool = PgPoolOptions::new()
        .max_connections(10)
        .connect(&database_url)
        .await
        .expect("Failed to create pool");

    HttpServer::new(move || {
        App::new()
            .wrap(Logger::default())
            .app_data(web::Data::new(pool.clone()))
            .configure(routes::configure)
    })
    .bind("0.0.0.0:8080")?
    .run()
    .await
}
```

## Route Configuration

```rust
// src/routes/mod.rs — centralized route registration
use actix_web::web;

mod articles;
mod health;

pub fn configure(cfg: &mut web::ServiceConfig) {
    cfg.service(
        web::scope("/api")
            .route("/health", web::get().to(health::check))
            .service(
                web::scope("/articles")
                    .route("", web::get().to(articles::list))
                    .route("", web::post().to(articles::create))
                    .route("/{id}", web::get().to(articles::get))
                    .route("/{id}", web::delete().to(articles::delete))
            )
    );
}
```

## Models

```rust
// src/models/article.rs — data models with serde
use serde::{Deserialize, Serialize};
use sqlx::FromRow;

#[derive(Debug, Serialize, FromRow)]
pub struct Article {
    pub id: i32,
    pub title: String,
    pub body: String,
    pub published: bool,
    pub created_at: chrono::NaiveDateTime,
}

#[derive(Debug, Deserialize)]
pub struct CreateArticle {
    pub title: String,
    pub body: String,
}

#[derive(Debug, Deserialize)]
pub struct ListParams {
    pub page: Option<u32>,
    pub limit: Option<u32>,
}
```

## Handlers with Extractors

```rust
// src/routes/articles.rs — request handlers
use actix_web::{web, HttpResponse};
use sqlx::PgPool;
use crate::models::article::{Article, CreateArticle, ListParams};
use crate::errors::AppError;

pub async fn list(
    pool: web::Data<PgPool>,
    query: web::Query<ListParams>,
) -> Result<HttpResponse, AppError> {
    let limit = query.limit.unwrap_or(20).min(100) as i64;
    let offset = ((query.page.unwrap_or(1) - 1) * limit as u32) as i64;

    let articles = sqlx::query_as::<_, Article>(
        "SELECT * FROM articles WHERE published = true ORDER BY created_at DESC LIMIT $1 OFFSET $2"
    )
    .bind(limit)
    .bind(offset)
    .fetch_all(pool.get_ref())
    .await?;

    Ok(HttpResponse::Ok().json(articles))
}

pub async fn create(
    pool: web::Data<PgPool>,
    body: web::Json<CreateArticle>,
) -> Result<HttpResponse, AppError> {
    let article = sqlx::query_as::<_, Article>(
        "INSERT INTO articles (title, body) VALUES ($1, $2) RETURNING *"
    )
    .bind(&body.title)
    .bind(&body.body)
    .fetch_one(pool.get_ref())
    .await?;

    Ok(HttpResponse::Created().json(article))
}

pub async fn get(
    pool: web::Data<PgPool>,
    path: web::Path<i32>,
) -> Result<HttpResponse, AppError> {
    let id = path.into_inner();
    let article = sqlx::query_as::<_, Article>("SELECT * FROM articles WHERE id = $1")
        .bind(id)
        .fetch_optional(pool.get_ref())
        .await?
        .ok_or(AppError::NotFound)?;

    Ok(HttpResponse::Ok().json(article))
}
```

## Error Handling

```rust
// src/errors.rs — custom error types
use actix_web::{HttpResponse, ResponseError};
use std::fmt;

#[derive(Debug)]
pub enum AppError {
    NotFound,
    Internal(String),
    Database(sqlx::Error),
}

impl fmt::Display for AppError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            AppError::NotFound => write!(f, "Not found"),
            AppError::Internal(msg) => write!(f, "{}", msg),
            AppError::Database(e) => write!(f, "Database error: {}", e),
        }
    }
}

impl ResponseError for AppError {
    fn error_response(&self) -> HttpResponse {
        match self {
            AppError::NotFound => HttpResponse::NotFound().json(serde_json::json!({"error": "not found"})),
            _ => HttpResponse::InternalServerError().json(serde_json::json!({"error": "internal error"})),
        }
    }
}

impl From<sqlx::Error> for AppError {
    fn from(e: sqlx::Error) -> Self { AppError::Database(e) }
}
```

## Middleware

```rust
// src/middleware/auth.rs — simple auth middleware
use actix_web::{dev::ServiceRequest, Error, HttpMessage};
use actix_web::error::ErrorUnauthorized;

pub async fn validate_token(req: &ServiceRequest) -> Result<(), Error> {
    let token = req.headers()
        .get("Authorization")
        .and_then(|v| v.to_str().ok())
        .and_then(|v| v.strip_prefix("Bearer "));

    match token {
        Some(t) => {
            let user_id = verify_jwt(t).map_err(|_| ErrorUnauthorized("invalid token"))?;
            req.extensions_mut().insert(user_id);
            Ok(())
        }
        None => Err(ErrorUnauthorized("missing token")),
    }
}
```

## Testing

```rust
// tests/articles_test.rs — integration test
use actix_web::{test, App, web};

#[actix_web::test]
async fn test_list_articles() {
    let pool = setup_test_db().await;
    let app = test::init_service(
        App::new()
            .app_data(web::Data::new(pool))
            .configure(routes::configure)
    ).await;

    let req = test::TestRequest::get().uri("/api/articles").to_request();
    let resp = test::call_service(&app, req).await;
    assert_eq!(resp.status(), 200);
}
```

## Key Patterns

- Use extractors (`web::Json`, `web::Path`, `web::Query`, `web::Data`) for type-safe request parsing
- Implement `ResponseError` on custom error types for automatic HTTP error responses
- Use `web::Data` for shared application state (DB pool, config) — it's cheaply cloneable
- Use `sqlx` with compile-time checked queries (`sqlx::query!`) for production code
- Use `configure` functions to modularize route registration
- Use `#[actix_web::test]` for async integration tests with `test::init_service`

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Review before install: Avoid automatic install

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Financial research output is not financial advice; require human review before any live investment decision
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Source repository: TerminalSkills/skills
License: Apache-2.0
Version: 1.0.0
Last GitHub push: Jul 26, 2026
Registry updated: Sep 4, 2026
Instruction path: skills/actix-web/SKILL.md @ 7a5cc96749b0

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      "setup_required": 0,
      "avg_output_quality": null,
      "production_outcomes": 0,
      "last_outcome_at": null,
      "label": "No agent outcome data yet"
    },
    "auto_install": {
      "allowed": false,
      "sandbox_required": true,
      "reason": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
    },
    "best_for": [
      "design-creative",
      "agent-skill"
    ],
    "known_risks": [
      "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",
      "Stars/forks activity: 145 stars, 16 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"
    ]
  },
  "agent_proven": {
    "version": "agent-proven-v1",
    "score": 0,
    "tier": "unproven",
    "label": "Needs first agent run",
    "summary": "No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.",
    "metrics": {
      "totalOutcomes": 0,
      "successfulOutcomes": 0,
      "failedOutcomes": 0,
      "installAttempts": 0,
      "installSuccessRate": null,
      "successRate": null,
      "recentSuccessRate": null,
      "recentFailureRate": null,
      "riskBlocked": 0,
      "setupRequired": 0,
      "notRelevant": 0,
      "avgOutputQuality": null,
      "avgTimeToUsefulMs": null,
      "productionOutcomes": 0,
      "humanReviewRequired": 0,
      "uniqueAgents": 0,
      "lastOutcomeAt": null
    },
    "signals": [],
    "penalties": [
      "No real agent outcome evidence yet"
    ]
  },
  "audit": {
    "score": 74,
    "risk_level": "needs_review",
    "risk_label": "Needs review",
    "warnings": [
      "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",
      "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",
      "Stars/forks activity: 145 stars, 16 forks; issue activity unavailable in current metadata",
      "Dependency/runtime risk: command execution surface, credential or environment access"
    ]
  },
  "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": 62,
    "label": "Promising"
  },
  "supply": {
    "track": "Design and creative production",
    "scenario": "Design and creative",
    "maintenance": "2mo since push",
    "risk": "Needs review"
  },
  "alternative_skills": [],
  "do_not_use_when": [
    "teams that need a vendor-supported SLA",
    "high-compliance environments without internal security review",
    "No OpenAgentSkill engagement data yet",
    "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",
    "Financial research output is not financial advice; require human review before any live investment decision."
  ],
  "agent_contract": {
    "task_input": "Use actix-web 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: 71/100 Manual review",
      "Audit: 74/100 Needs review",
      "Safety: 34/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "terminalskills-actix-web (actix-web)",
      "install_command": "npx skills add TerminalSkills/skills --skill actix-web",
      "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": "terminalskills-actix-web",
      "task": "Use actix-web 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/terminalskills-actix-web",
    "api": "https://www.openagentskill.com/api/agent/skills/terminalskills-actix-web",
    "audit": "https://www.openagentskill.com/skills/terminalskills-actix-web/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=terminalskills-actix-web&task=Use%20actix-web%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20actix-web%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20actix-web%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/terminalskills-actix-web/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/terminalskills-actix-web"
  }
}

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

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