What does the Check 12 Factor Compliance AI skill do?

Analyzes PHP code for 12-Factor App compliance. Detects hardcoded configuration, file-based state, env-specific conditionals, non-streaming logs, and missing environment variable usage.

Why use Check 12 Factor Compliance on TypingMind?

Because you install it once and use it with any model. Check 12 Factor Compliance is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Check 12 Factor Compliance in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/dykyi-roman/awesome-claude-code/tree/master/skills/check-12-factor-compliance. TypingMind reads its SKILL.md and installs it as a skill you can enable per chat.

Which AI models can use Check 12 Factor Compliance?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Check 12 Factor Compliance?

As many as you like. As long as a model supports skills, you can use Check 12 Factor Compliance with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Check 12 Factor Compliance AI skill free?

Yes. It is published on GitHub by dykyi-roman under the MIT license. You only pay your own AI provider for the tokens you use.

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

Check 12 Factor Compliance by dykyi-roman — AI Skill for Any LLM

12-Factor App Compliance Check

Analyze PHP code for violations of the 12-Factor App methodology that hinder deployment, scalability, and operational excellence.

Detection Patterns

1. Hardcoded Configuration (Factor III: Config)

php
<?php

declare(strict_types=1);

// BAD: Configuration values embedded in source code
final class MailerConfig
{
    private string $smtpHost = 'smtp.gmail.com';
    private int $smtpPort = 587;
    private string $apiKey = 'sk-live-abc123xyz';
}

// BAD: Database credentials in code
final class DatabaseConfig
{
    public function getDsn(): string
    {
        return 'mysql:host=localhost;port=3306;dbname=myapp';
    }

    public function getUser(): string
    {
        return 'root';
    }

    public function getPassword(): string
    {
        return 'secret123';
    }
}

// GOOD: All configuration from environment variables
final readonly class MailerConfig
{
    public function __construct(
        private string $smtpHost,
        private int $smtpPort,
        private string $apiKey,
    ) {}

    public static function fromEnvironment(): self
    {
        return new self(
            smtpHost: self::requireEnv('SMTP_HOST'),
            smtpPort: (int) self::requireEnv('SMTP_PORT'),
            apiKey: self::requireEnv('MAILER_API_KEY'),
        );
    }

    private static function requireEnv(string $name): string
    {
        return getenv($name) ?: throw new \RuntimeException(
            sprintf('Environment variable %s is required', $name),
        );
    }
}

2. File-Based State (Factor VI: Processes)

php
<?php

declare(strict_types=1);

// BAD: Persistent state in local filesystem
final class CounterService
{
    public function increment(string $key): int
    {
        $file = '/var/data/counters/' . $key . '.txt';
        $current = (int) file_get_contents($file);
        file_put_contents($file, (string) ($current + 1));

        return $current + 1;
        // State lost on container restart, inconsistent across instances
    }
}

// BAD: Cache stored in local files
final class FileCacheService
{
    public function get(string $key): mixed
    {
        $path = '/tmp/cache/' . md5($key);
        if (!file_exists($path)) {
            return null;
        }

        return unserialize(file_get_contents($path));
    }
}

// GOOD: State in external backing service
final readonly class CounterService
{
    public function __construct(
        private \Redis $redis,
    ) {}

    public function increment(string $key): int
    {
        return $this->redis->incr('counter:' . $key);
    }
}

3. Environment-Specific Conditionals (Factor X: Dev/Prod Parity)

php
<?php

declare(strict_types=1);

// BAD: Behavior branches based on environment name
final class NotificationService
{
    public function send(Notification $notification): void
    {
        if (getenv('APP_ENV') === 'production') {
            $this->smsGateway->send($notification);
        } else {
            // Skip SMS in dev/staging
            error_log('SMS skipped: ' . $notification->message());
        }
    }
}

// BAD: Different logic per environment
if ($_SERVER['APP_ENV'] === 'production') {
    $cache = new RedisCache($redisHost);
} elseif ($_SERVER['APP_ENV'] === 'staging') {
    $cache = new FileCache('/tmp/cache');
} else {
    $cache = new ArrayCache();
}

// GOOD: Same code, different config per environment
// Use interfaces and inject implementation via DI container
final readonly class NotificationService
{
    public function __construct(
        private SmsGatewayInterface $smsGateway, // Real in prod, null/fake in dev
    ) {}

    public function send(Notification $notification): void
    {
        $this->smsGateway->send($notification);
    }
}

// services.yaml (production):
// SmsGatewayInterface: '@TwilioSmsGateway'

// services.yaml (development):
// SmsGatewayInterface: '@NullSmsGateway'

4. Non-Streaming Logs (Factor XI: Logs)

php
<?php

declare(strict_types=1);

// BAD: Writing logs to local files
final class Logger
{
    public function log(string $message): void
    {
        file_put_contents(
            '/var/log/app/application.log',
            date('Y-m-d H:i:s') . ' ' . $message . PHP_EOL,
            FILE_APPEND,
        );
        // Log files grow unbounded, lost on container death
    }
}

// BAD: Custom log rotation in application
final class RotatingLogger
{
    public function log(string $message): void
    {
        $file = '/var/log/app/app-' . date('Y-m-d') . '.log';
        file_put_contents($file, $message . PHP_EOL, FILE_APPEND);

        // Application should NOT manage log rotation
        $this->cleanOldLogs();
    }
}

// GOOD: Write to stdout/stderr (event stream)
final readonly class StreamLogger implements LoggerInterface
{
    public function log(mixed $level, string|\Stringable $message, array $context = []): void
    {
        $entry = json_encode([
            'timestamp' => (new DateTimeImmutable())->format(DateTimeInterface::RFC3339),
            'level' => $level,
            'message' => (string) $message,
            'context' => $context,
        ], JSON_THROW_ON_ERROR);

        // Write to stderr -- container runtime captures this
        fwrite(STDERR, $entry . PHP_EOL);
    }
}

// GOOD: Monolog with stderr handler
// monolog.yaml:
// monolog:
//     handlers:
//         main:
//             type: stream
//             path: "php://stderr"
//             level: info
//             formatter: json

5. Missing Environment Variable Usage (Factor III: Config)

php
<?php

declare(strict_types=1);

// BAD: Configuration not driven by environment
final class AppConfig
{
    public function getCacheDriver(): string
    {
        return 'redis'; // Hardcoded, cannot change without deploy
    }

    public function getMaxUploadSize(): int
    {
        return 10 * 1024 * 1024; // 10MB hardcoded
    }

    public function getApiBaseUrl(): string
    {
        return 'https://api.example.com/v2'; // Hardcoded URL
    }
}

// GOOD: Environment-driven configuration
final readonly class AppConfig
{
    public function __construct(
        private string $cacheDriver,
        private int $maxUploadSize,
        private string $apiBaseUrl,
    ) {}

    public static function fromEnvironment(): self
    {
        return new self(
            cacheDriver: getenv('CACHE_DRIVER') ?: 'redis',
            maxUploadSize: (int) (getenv('MAX_UPLOAD_SIZE') ?: '10485760'),
            apiBaseUrl: getenv('API_BASE_URL') ?: throw new \RuntimeException('API_BASE_URL required'),
        );
    }
}

6. Hardcoded Backing Services (Factor IV: Backing Services)

php
<?php

declare(strict_types=1);

// BAD: Backing service URLs hardcoded
final class ExternalServices
{
    public function getPaymentGateway(): PaymentClient
    {
        return new PaymentClient('https://api.stripe.com/v1');
    }

    public function getSearchEngine(): SearchClient
    {
        return new SearchClient('http://elasticsearch:9200');
    }

    public function getQueueConnection(): AMQPConnection
    {
        return new AMQPConnection('amqp://guest:guest@rabbitmq:5672/');
    }
}

// GOOD: Backing services as attached resources via config
final readonly class ExternalServices
{
    public function __construct(
        private string $paymentGatewayUrl,
        private string $searchEngineUrl,
        private string $queueDsn,
    ) {}

    public static function fromEnvironment(): self
    {
        return new self(
            paymentGatewayUrl: getenv('PAYMENT_GATEWAY_URL')
                ?: throw new \RuntimeException('PAYMENT_GATEWAY_URL required'),
            searchEngineUrl: getenv('SEARCH_ENGINE_URL')
                ?: throw new \RuntimeException('SEARCH_ENGINE_URL required'),
            queueDsn: getenv('QUEUE_DSN')
                ?: throw new \RuntimeException('QUEUE_DSN required'),
        );
    }

    public function getPaymentGateway(): PaymentClient
    {
        return new PaymentClient($this->paymentGatewayUrl);
    }

    public function getSearchEngine(): SearchClient
    {
        return new SearchClient($this->searchEngineUrl);
    }

    public function getQueueConnection(): AMQPConnection
    {
        return new AMQPConnection($this->queueDsn);
    }
}

Grep Patterns

bash
# Hardcoded configuration values (Factor III)
Grep: "= 'smtp\.|= 'redis://|= 'mysql://|= 'amqp://|= 'https?://" --glob "**/src/**/*.php"
Grep: "'localhost'|'127\.0\.0\.1'|:3306|:6379|:5672|:9200" --glob "**/src/**/*.php"

# Hardcoded credentials
Grep: "password.*=.*['\"]|apiKey.*=.*['\"]|secret.*=.*['\"]" --glob "**/src/**/*.php"

# File-based state (Factor VI)
Grep: "file_put_contents\(|file_get_contents\(.*var|fwrite\(.*tmp" --glob "**/src/**/*.php"

# Environment-specific conditionals (Factor X)
Grep: "APP_ENV.*===|getenv\(['\"]APP_ENV|SERVER\[.APP_ENV" --glob "**/src/**/*.php"
Grep: "=== 'production'|=== 'staging'|=== 'development'" --glob "**/src/**/*.php"

# Non-streaming logs (Factor XI)
Grep: "file_put_contents\(.*\.log|fopen\(.*\.log|error_log\(" --glob "**/src/**/*.php"

# Missing env var usage (Factor III)
Grep: "getenv\(|env\(|\\\$_ENV|_SERVER\[" --glob "**/src/**/*.php"

# Backing service URLs in code (Factor IV)
Grep: "new.*Client\(['\"]https?://|new.*Connection\(['\"]" --glob "**/src/**/*.php"

12-Factor Mapping

Factor	Name	What to Check
I	Codebase	Single repo, multiple deploys
II	Dependencies	composer.json declares all deps
III	Config	No hardcoded config in source
IV	Backing Services	URLs/DSNs from environment
V	Build, Release, Run	Separate build and run stages
VI	Processes	Stateless, shared-nothing
VII	Port Binding	Self-contained, no external webserver dependency
VIII	Concurrency	Scale via process model
IX	Disposability	Fast startup, graceful shutdown
X	Dev/Prod Parity	Minimal gap between environments
XI	Logs	Treat logs as event streams
XII	Admin Processes	One-off admin tasks as processes

Severity Classification

Pattern	Severity
Hardcoded credentials in source code	🔴 Critical
Hardcoded database/service URLs	🟠 Major
File-based persistent state	🟠 Major
Environment-specific conditionals	🟠 Major
Non-streaming logs (file-based)	🟠 Major
Hardcoded non-secret config values	🟡 Minor
Missing env var for optional settings	🟡 Minor

Output Format

markdown
### 12-Factor Violation: [Factor Name] -- [Brief Description]

**Severity:** 🔴/🟠/🟡
**Location:** `file.php:line`
**Factor:** [III Config|IV Backing Services|VI Processes|X Dev/Prod Parity|XI Logs]

**Issue:**
[Description of the 12-Factor violation]

**Impact:**
- Cannot deploy to different environments without code change
- State lost on container restart
- Logs lost when instance terminates

**Code:**
```php
// Non-compliant code

Fix:

php
// 12-Factor compliant code



## When This Is Acceptable

- **Framework defaults** -- Framework-provided defaults (like Monolog file handler in dev) are standard practice
- **Constants** -- Truly constant values (HTTP status codes, mathematical constants) belong in code
- **Test configuration** -- Test suites may use hardcoded config for reproducibility
- **CLI tools** -- Local development tools may use filesystem legitimately

### False Positive Indicators
- Value is a mathematical or protocol constant, not a deployment config
- Hardcoded value is a default with environment override: `getenv('X') ?: 'default'`
- File path is for temporary processing, not persistent state
- Code is in a test file, fixture, or seed script

Publisher	dykyi-roman
Repository	`awesome-claude-code`
Skill name	`check-12-factor-compliance`
Stars	98
Forks	25
Bundled files	Instructions only
License	MIT
Links	Skill source Repository

Check 12 Factor Compliance

Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

12-Factor App Compliance Check

Detection Patterns

1. Hardcoded Configuration (Factor III: Config)

2. File-Based State (Factor VI: Processes)

3. Environment-Specific Conditionals (Factor X: Dev/Prod Parity)

4. Non-Streaming Logs (Factor XI: Logs)

5. Missing Environment Variable Usage (Factor III: Config)

6. Hardcoded Backing Services (Factor IV: Backing Services)

Grep Patterns

12-Factor Mapping

Severity Classification

Output Format

Frequently asked questions

Set up your own AI workspace now

Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

12-Factor App Compliance Check

Detection Patterns

1. Hardcoded Configuration (Factor III: Config)

2. File-Based State (Factor VI: Processes)

3. Environment-Specific Conditionals (Factor X: Dev/Prod Parity)

4. Non-Streaming Logs (Factor XI: Logs)

5. Missing Environment Variable Usage (Factor III: Config)

6. Hardcoded Backing Services (Factor IV: Backing Services)

Grep Patterns

12-Factor Mapping

Severity Classification

Output Format

Frequently asked questions

Related AI Skills

Set up your own AI workspace now