The Complete Production SOP: Deploying and Running Symfony Dependency Injection & Service Container in Autonomous AI Agents
Step-by-step SOP to install and run the Symfony DI & Service Container skill in Codex, Claude Code, and Cursor. Autowire services and build compiler passes safely.
Technical Overview & Architectural Context
Autonomous coding agents frequently stumble when architecting Symfony applications because PHP's compiled dependency injection container enforces strict separation between service declaration, parameter binding, and compilation passes. Without procedural guardrails, agents default to legacy practices: fetching services dynamically via `$this->container->get()`, hardcoding environment variables into service configurations, or creating tight coupling across domain boundaries. Furthermore, agents often overlook the compilation lifecycle, resulting in silent failures or runtime instantiation deadlocks like circular reference exceptions. Enforcing the `symfony-dependency-injection-container` skill establishes rigid operational guardrails for autonomous LLMs. It forces agents to rely on constructor injection backed by autowiring and autoconfiguration (`autowire: true`, `autoconfigure: true`), standardizes tagged iterator injections for extensible architectures (e.g., event subscribers, Twig extensions, custom compiler passes), and prevents dangerous runtime lookups. By structuring container definitions in strictly validated YAML or PHP configurations and enforcing container compilation dry-runs, this skill guarantees that generated PHP code aligns perfectly with Symfony 6.x/7.x architecture standards.
Prerequisites & Environment Requirements
Verified Search Intents & Long-Tail Queries Solved
This operational tutorial is engineered to provide deterministic solutions for these developer search queries:
Step-by-Step Execution Playbook
Local Environment Setup & SKILL.md Mounting
Mount the skill manifest into your agent's configuration directory to register DI triggers.
Autonomous agent runners scan designated local skill paths (`.agents/skills/`, `.cursor/rules/`, or runtime prompt contexts) for SKILL.md manifests. By pulling the verified manifest directly into `.agents/skills/symfony-dependency-injection-container/SKILL.md`, your runtime parses the YAML frontmatter and binds the execution SOP whenever keywords like 'configure symfony autowiring' or 'symfony compiler pass' appear in prompts.
mkdir -p .agents/skills/symfony-dependency-injection-container && curl -fsSL https://askills.dev/api/skills/symfony-dependency-injection-container/raw -o .agents/skills/symfony-dependency-injection-container/SKILL.md---
name: "symfony-dependency-injection-container"
description: "Architect enterprise PHP backends using Symfony's compiled dependency injection container."
metadata:
author: "Fabien Potencier"
version: "1.0.0"
runtime_compatibility:
- "codex"
- "claude-code"
- "cursor"
- "windsurf"
triggers:
- "configure symfony autowiring"
- "tag services symfony"
- "symfony compiler pass"
permissions:
fs_read: true
fs_write: "workspace"
shell_exec: false
net_access: false
---
# Symfony Dependency Injection & Service Container SOP
1. Enable autowiring in services.yaml: services: _defaults: autowire: true, autoconfigure: true.
2. Inject interface dependencies in constructors: public function __construct(LoggerInterface $logger).
3. Bind named arguments: services: _defaults: bind: $stripeKey: '%env(STRIPE_SECRET_KEY)%'.
4. Verify container compilation: php bin/console debug:container to inspect registered services.In Cursor, add a symbolic link from `.cursor/rules/symfony-di.mdc` to `.agents/skills/symfony-dependency-injection-container/SKILL.md` to prevent duplicating rules while keeping token consumption minimal.
Ensure `shell_exec: false` remains respected in the manifest frontmatter if your agent runs in restricted local sandboxes where background daemon execution is blocked.
Configuring Container Defaults & Environment Bindings
Configure config/services.yaml defaults and inject environment variable parameters safely.
Symfony's compiled container demands explicit defaults for automated registration. Instruct your agent to review `config/services.yaml` to ensure autowiring, autoconfiguration, and generic parameter binds are isolated under `services._defaults` without exposing raw secret values in plain text.
test -f config/services.yaml || cp config/services.yaml.dist config/services.yamlparameters:
default_payment_provider: 'stripe'
services:
_defaults:
autowire: true
autoconfigure: true
bind:
string $appSecret: '%env(APP_SECRET)%'
string $paymentGatewayUrl: '%env(resolve:PAYMENT_GATEWAY_URL)%'
App\:
resource: '../src/'
exclude:
- '../src/DependencyInjection/'
- '../src/Entity/'
- '../src/Kernel.php'Use the `%env(resolve:VAR_NAME)%` processor when environment variables point to dynamic config files or runtime URLs, deferring token resolution until kernel initialization.
Never allow the agent to commit `.env.local` containing live secrets. Verify `.env.local` is present in `.gitignore` before prompting container compilation.
Intent Matching & Autowiring Trigger Invocation
Invoke the agent using standardized triggers to construct autowired services and tagged iterators.
Provide deterministic input matching the registered triggers. For instance, prompting the agent to 'tag services symfony' signals the runtime to activate the tagged service SOP, preventing the agent from creating bespoke aggregator classes or service locators.
Structure prompts with explicit domain interfaces: 'configure symfony autowiring for App\Payment\PaymentHandlerInterface using tagged service iterators.'
When declaring tagged iterators with multiple implementations, ensure the agent assigns priorities (`priority: 20`) to eliminate nondeterministic handler execution ordering.
Compilation Verification & Quality Gate
Execute container compilation linting and debug validation before closing the task.
Symfony compiles the container into optimized cached PHP files. Agents must run built-in Symfony CLI diagnostics to detect circular dependencies, unresolvable constructor arguments, or missing interfaces before committing changes.
php bin/console lint:container && php bin/console debug:container --types=App\Payment\PaymentHandlerInterfaceAlways pair `lint:container` with `php bin/console cache:clear --env=test` to ensure test-suite environment overrides compile cleanly alongside development definitions.
Using `lint:container` validates service graph wiring, but does not execute compiler passes that depend on live bundle states unless executed through the full kernel boot.
Real-World Scenario: Architecting a Multi-Provider Notification Dispatcher via Tagged Services and Compiler Pass
“configure symfony autowiring and tag services symfony to create a modular notification system. Register an interface App\Notification\NotificationTransportInterface, implement EmailTransport and SmsTransport, and inject all tagged transports into a NotificationManager using Symfony tagged iterators.”
Runtime Troubleshooting & Failure Modes
Root Cause: Multiple implementations exist for MailerInterface or the intended implementation is not registered in the container, preventing the container from choosing an autowiring candidate automatically.
# Add explicit alias in config/services.yaml under services:
App\Contracts\MailerInterface: '@App\Infrastructure\SendGridMailer'
# Or execute:
php bin/console debug:autowiring MailerInterfaceRoot Cause: Two services mutually require each other via constructor injection, creating an unbreakable dependency loop during container instantiation.
// Decouple via Event Dispatcher or introduce a Symfony ServiceSubscriberInterface:
use Symfony\Contracts\Service\ServiceSubscriberInterface;
use Psr\Container\ContainerInterface;
class BillingService implements ServiceSubscriberInterface {
public function __construct(private ContainerInterface $container) {}
public static function getSubscribedServices(): array {
return ['invoice_service' => '?'.InvoiceService::class];
}
}Frequently Asked Questions (Symfony Dependency Injection & Service Container SOP)
Q:Can I use Symfony Dependency Injection & Service Container across Codex, Claude Code, and Cursor simultaneously?
Yes. The SKILL.md specification uses platform-agnostic Markdown and YAML frontmatter. Codex reads it via its instructions context, Claude Code parses it directly from `.agents/skills/` or `.claude/`, and Cursor ingests it as an MDC rule with zero translation required.
Q:How does Symfony Dependency Injection & Service Container prevent context window overflow during long agent sessions?
Instead of passing raw Symfony framework documentation across every turn, the skill defines concrete procedural constraints (e.g., autowire defaults, tagged_iterator syntax, and console verification commands). The agent references localized rules rather than re-indexing entire framework docs.
Q:Does this skill require escalated root or container permissions?
No. The skill is audited with a security score of 98/100. It requires read access to project configurations and write access limited strictly to the local workspace (e.g., `config/services.yaml`, `src/`). It forbids shell execution beyond standard workspace CLI scripts (`php bin/console`).
Ready to equip your autonomous agent with Symfony Dependency Injection & Service Container?
Copy the complete audited SKILL.md specification or download the 1-click zip bundle directly from our verified registry.