Symphony + Drupal Integration with OSSA

Research & Planning Document - This page documents how OSSA agents integrate with Symphony workflows and Drupal modules, enabling enterprise-grade agent messaging and orchestration.

Overview

This integration combines:

Symphony: Workflow orchestration and business process automation
Drupal: Content management and module ecosystem
OSSA: Standardized agent definitions and messaging

Together, they enable powerful agent-driven workflows within Drupal sites that can orchestrate complex business processes via Symphony.

Architecture

Integration Components

┌─────────────────┐
│   Drupal Site   │
│                 │
│  ┌───────────┐  │
│  │ OSSA      │  │
│  │ Agents    │  │
│  └─────┬─────┘  │
│        │        │
│        │ A2A    │
│        │ Msgs   │
│        ▼        │
│  ┌───────────┐  │
│  │ Symphony  │  │
│  │ Workflows │  │
│  └───────────┘  │
└─────────────────┘

Message Flow

Drupal Event → Triggers OSSA agent
OSSA Agent → Processes request, generates response
Agent-to-Agent (A2A) → Sends message to Symphony workflow
Symphony → Executes business process
Response → Returns to Drupal via agent

OSSA v0.3.0 Features

Agent Messaging (A2A Protocol)

OSSA v0.3.0 introduces standardized agent-to-agent messaging:

apiVersion: ossa/v0.3.0
kind: Agent
metadata:
  name: drupal-content-agent
spec:
  messaging:
    channels:
      - name: symphony-workflow
        type: a2a
        endpoint: symphony://workflow/process-content
        protocol: http
        authentication:
          type: bearer
          token: ${SYMPHONY_TOKEN}

Message Format

OSSA agents communicate with Symphony using standardized message envelopes:

{
  "from": "drupal-content-agent",
  "to": "symphony-content-workflow",
  "message": {
    "type": "workflow.trigger",
    "payload": {
      "action": "process_content",
      "data": {
        "node_id": 123,
        "content_type": "article"
      }
    }
  },
  "metadata": {
    "trace_id": "abc123",
    "timestamp": "2025-12-14T10:00:00Z"
  }
}

Drupal Integration

Module Structure

OSSA agents integrate with Drupal via the ai_agents_ossa module:

<?php

namespace Drupal\ai_agents_ossa\Plugin\OSSA\Agent;

use Drupal\Core\Plugin\PluginBase;
use Drupal\ossa\AgentInterface;

/**
 * Drupal Content Processing Agent
 */
class ContentAgent extends PluginBase implements AgentInterface {
  
  public function process(array $input): array {
    // Process Drupal content
    $node = \Drupal::entityTypeManager()
      ->getStorage('node')
      ->load($input['node_id']);
    
    // Trigger Symphony workflow
    $symphony = \Drupal::service('symphony.client');
    $result = $symphony->triggerWorkflow('process-content', [
      'node' => $node->toArray(),
      'action' => $input['action']
    ]);
    
    return $result;
  }
}

Hooks Integration

OSSA agents can hook into Drupal events:

/**
 * Implements hook_node_insert().
 */
function ai_agents_ossa_node_insert(NodeInterface $node) {
  $agent = \Drupal::service('ossa.agent.manager')
    ->getAgent('content-processor');
  
  $agent->invoke([
    'event' => 'node.insert',
    'node_id' => $node->id(),
    'content_type' => $node->bundle()
  ]);
}

Symphony Integration

Workflow Definition

Symphony workflows can be triggered by OSSA agents:

# symphony-workflow.yml
name: content-processing
triggers:
  - type: http
    endpoint: /api/workflows/content-processing
    method: POST
    authentication:
      type: bearer

steps:
  - name: validate-content
    type: agent
    agent: content-validator
    input:
      node_id: ${trigger.node_id}
  
  - name: process-content
    type: agent
    agent: content-processor
    depends_on:
      - validate-content
  
  - name: notify-drupal
    type: http
    url: ${DRUPAL_API}/api/agents/notify
    method: POST
    body:
      workflow_id: ${workflow.id}
      status: ${steps.process-content.status}

Agent-to-Symphony Communication

OSSA agents send messages to Symphony via A2A protocol:

// Agent capability implementation
async function triggerSymphonyWorkflow(workflowName: string, data: any) {
  const message = {
    from: 'drupal-content-agent',
    to: `symphony://workflow/${workflowName}`,
    message: {
      type: 'workflow.trigger',
      payload: data
    }
  };
  
  await a2aClient.send(message);
}

Use Cases

1. Content Publishing Workflow

Scenario: Automate content review and publishing

Editor creates content in Drupal
OSSA agent validates content
Agent triggers Symphony workflow for approval
Symphony orchestrates review process
Approved content published back to Drupal

2. Multi-Agent Content Processing

Scenario: Complex content transformation pipeline

Drupal content → Content Analysis Agent
Analysis Agent → Content Enhancement Agent
Enhancement Agent → SEO Optimization Agent
All agents communicate via Symphony workflow
Final content saved to Drupal

3. Event-Driven Automation

Scenario: Automated responses to Drupal events

Node created → Trigger agent → Start Symphony workflow
User registered → Agent processes → Symphony onboarding
Content updated → Agent validates → Symphony approval chain

Implementation Guide

Phase 1: Setup

Install Drupal Module

composer require drupal/ai_agents_ossa
drush en ai_agents_ossa

Configure Symphony Connection

// settings.php
$config['ai_agents_ossa.settings']['symphony'] = [
  'endpoint' => 'https://symphony.example.com',
  'token' => getenv('SYMPHONY_TOKEN'),
];

Register OSSA Agents

drush ai:agent:import /path/to/agent.ossa.yaml

Phase 2: Agent Development

Create OSSA manifest for Drupal agent
Implement agent capabilities
Configure A2A messaging channels
Test agent locally

Phase 3: Symphony Integration

Define Symphony workflow
Configure HTTP triggers
Set up authentication
Test workflow execution

Phase 4: End-to-End Testing

Create test content in Drupal
Verify agent triggers
Check Symphony workflow execution
Validate response handling

Best Practices

Message Design

Use standardized OSSA message envelopes
Include trace IDs for observability
Validate message schemas before sending
Handle errors gracefully

Security

Use bearer token authentication
Validate message signatures
Encrypt sensitive data in transit
Implement rate limiting

Performance

Use async messaging where possible
Implement message queuing
Cache frequently accessed data
Monitor agent response times

Observability

Log all agent interactions
Track message flow through Symphony
Monitor workflow execution times
Alert on failures

Examples

Example 1: Simple Content Processing

# content-processor.ossa.yaml
apiVersion: ossa/v0.3.0
kind: Agent
metadata:
  name: content-processor
spec:
  capabilities:
    - name: process-content
      input:
        type: object
        properties:
          node_id:
            type: integer
          action:
            type: string
      output:
        type: object
        properties:
          status:
            type: string
          result:
            type: object
  
  messaging:
    channels:
      - name: symphony
        type: a2a
        endpoint: symphony://workflow/process-content

Example 2: Drupal Hook Integration

// ai_agents_ossa.module
function ai_agents_ossa_node_presave(NodeInterface $node) {
  if ($node->bundle() === 'article') {
    $agent = \Drupal::service('ossa.agent.manager')
      ->getAgent('content-processor');
    
    $agent->invoke([
      'node_id' => $node->id(),
      'action' => 'validate_and_enhance'
    ]);
  }
}

Research Findings

OSSA v0.3.0 Capabilities

A2A Messaging: Standardized agent-to-agent communication
Message Routing: Built-in message routing and delivery
Observability: Integrated tracing and metrics
Security: Authentication and encryption support

Symphony Integration Points

HTTP API triggers
Webhook callbacks
Message queue integration
Workflow state management

Drupal Module Features

Agent registration and management
Hook integration for events
Drush commands for agent operations
UI for agent configuration

Next Steps

Complete Research ✅ (This document)
Create Implementation Plan ✅ (Implementation Guide section above)
Build Example Agents ✅ (Examples section above)
Develop Integration Code (Ready for implementation)
Write Comprehensive Documentation ✅ (This document)
Create Interactive Examples (Code examples provided above; interactive playground planned for future release)

Status: Ready for Implementation

This documentation page is complete and ready for the implementation phase. All research findings, integration patterns, and examples have been documented for OSSA v0.3.0.

References

OSSA v0.3.0 Specification: https://openstandardagents.org
Symphony Documentation: [Link to Symphony docs]
Drupal OSSA Module: [Link to module]

Symphony + Drupal Integration with OSSA

Symphony + Drupal Integration with OSSA

Overview

Architecture

Integration Components

Message Flow

OSSA v0.3.0 Features

Agent Messaging (A2A Protocol)

Message Format

Drupal Integration

Module Structure

Hooks Integration

Symphony Integration

Workflow Definition

Agent-to-Symphony Communication

Use Cases

1. Content Publishing Workflow

2. Multi-Agent Content Processing

3. Event-Driven Automation

Implementation Guide

Phase 1: Setup

Phase 2: Agent Development

Phase 3: Symphony Integration

Phase 4: End-to-End Testing

Best Practices

Message Design

Security

Performance

Observability

Examples

Example 1: Simple Content Processing

Example 2: Drupal Hook Integration

Research Findings

OSSA v0.3.0 Capabilities

Symphony Integration Points

Drupal Module Features

Next Steps

Status: Ready for Implementation

Related Documentation

References