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Eventbridge Agent Skill

by itsmostafa

AWS EventBridge serverless event bus for event-driven architectures. Use when creating rules, configuring event patterns, setting up scheduled events, integrating with SaaS, or building cross-account event routing.

4k tokens
context cost
the whole folder, loaded on every use
2
files
instructions only
0
copies elsewhere
how many repositories repackaged it
1139
stars on the repo
on the repository, not the skill itself

Install

one command, takes just this skill from the repository 
npx skills add https://github.com/itsmostafa/aws-agent-skills --skill eventbridge

The instruction itself

30 sections, as written by the author

AWS EventBridge

Amazon EventBridge is a serverless event bus that connects applications using events. Route events from AWS services, custom applications, and SaaS partners.

Table of Contents

  • Core Concepts
  • Common Patterns
  • CLI Reference
  • Best Practices
  • Troubleshooting
  • References

Core Concepts

Event Bus

Channel that receives events. Types:

  • Default: Receives AWS service events
  • Custom: Your application events
  • Partner: SaaS application events

Rules

Match incoming events and route to targets. Each rule can have up to 5 targets.

Event Patterns

JSON patterns that define which events match a rule.

Targets

AWS services that receive matched events (Lambda, SQS, SNS, Step Functions, etc.).

Scheduler

Schedule one-time or recurring events to invoke targets.

Common Patterns

Create Custom Event Bus and Rule

AWS CLI:

# Create custom event bus
aws events create-event-bus --name my-app-events

# Create rule
aws events put-rule \
  --name order-created-rule \
  --event-bus-name my-app-events \
  --event-pattern '{
    "source": ["my-app.orders"],
    "detail-type": ["Order Created"]
  }'

# Add Lambda target
aws events put-targets \
  --rule order-created-rule \
  --event-bus-name my-app-events \
  --targets '[{
    "Id": "process-order",
    "Arn": "arn:aws:lambda:us-east-1:123456789012:function:ProcessOrder"
  }]'

# Add Lambda permission
aws lambda add-permission \
  --function-name ProcessOrder \
  --statement-id eventbridge-order-created \
  --action lambda:InvokeFunction \
  --principal events.amazonaws.com \
  --source-arn arn:aws:events:us-east-1:123456789012:rule/my-app-events/order-created-rule

boto3:

import boto3

events = boto3.client('events')

# Create event bus
events.create_event_bus(Name='my-app-events')

# Create rule
events.put_rule(
    Name='order-created-rule',
    EventBusName='my-app-events',
    EventPattern=json.dumps({
        'source': ['my-app.orders'],
        'detail-type': ['Order Created']
    }),
    State='ENABLED'
)

# Add target
events.put_targets(
    Rule='order-created-rule',
    EventBusName='my-app-events',
    Targets=[{
        'Id': 'process-order',
        'Arn': 'arn:aws:lambda:us-east-1:123456789012:function:ProcessOrder'
    }]
)

Publish Custom Events

import boto3
import json

events = boto3.client('events')

events.put_events(
    Entries=[
        {
            'Source': 'my-app.orders',
            'DetailType': 'Order Created',
            'Detail': json.dumps({
                'order_id': '12345',
                'customer_id': 'cust-789',
                'total': 99.99,
                'items': [
                    {'product_id': 'prod-1', 'quantity': 2}
                ]
            }),
            'EventBusName': 'my-app-events'
        }
    ]
)

Scheduled Events

# Run every 5 minutes
aws events put-rule \
  --name every-5-minutes \
  --schedule-expression "rate(5 minutes)"

# Run at specific times (cron)
aws events put-rule \
  --name daily-cleanup \
  --schedule-expression "cron(0 2 * * ? *)"

# Add target
aws events put-targets \
  --rule every-5-minutes \
  --targets '[{
    "Id": "cleanup-function",
    "Arn": "arn:aws:lambda:us-east-1:123456789012:function:Cleanup"
  }]'

EventBridge Scheduler (One-Time and Flexible)

# One-time schedule
aws scheduler create-schedule \
  --name send-reminder \
  --schedule-expression "at(2024-12-25T09:00:00)" \
  --target '{
    "Arn": "arn:aws:lambda:us-east-1:123456789012:function:SendReminder",
    "RoleArn": "arn:aws:iam::123456789012:role/scheduler-role",
    "Input": "{\"message\": \"Merry Christmas!\"}"
  }' \
  --flexible-time-window '{"Mode": "OFF"}'

# Recurring with flexible window
aws scheduler create-schedule \
  --name hourly-sync \
  --schedule-expression "rate(1 hour)" \
  --target '{
    "Arn": "arn:aws:lambda:us-east-1:123456789012:function:SyncData",
    "RoleArn": "arn:aws:iam::123456789012:role/scheduler-role"
  }' \
  --flexible-time-window '{"Mode": "FLEXIBLE", "MaximumWindowInMinutes": 15}'

AWS Service Events

# EC2 state changes
aws events put-rule \
  --name ec2-state-change \
  --event-pattern '{
    "source": ["aws.ec2"],
    "detail-type": ["EC2 Instance State-change Notification"],
    "detail": {
      "state": ["stopped", "terminated"]
    }
  }'

# S3 object created
aws events put-rule \
  --name s3-upload \
  --event-pattern '{
    "source": ["aws.s3"],
    "detail-type": ["Object Created"],
    "detail": {
      "bucket": {"name": ["my-bucket"]},
      "object": {"key": [{"prefix": "uploads/"}]}
    }
  }'

CLI Reference

Event Buses

| Command | Description |

|---------|-------------|

| aws events create-event-bus | Create event bus |

| aws events delete-event-bus | Delete event bus |

| aws events list-event-buses | List event buses |

| aws events describe-event-bus | Get event bus details |

Rules

| Command | Description |

|---------|-------------|

| aws events put-rule | Create or update rule |

| aws events delete-rule | Delete rule |

| aws events list-rules | List rules |

| aws events describe-rule | Get rule details |

| aws events enable-rule | Enable rule |

| aws events disable-rule | Disable rule |

Targets

| Command | Description |

|---------|-------------|

| aws events put-targets | Add targets to rule |

| aws events remove-targets | Remove targets |

| aws events list-targets-by-rule | List rule targets |

Events

| Command | Description |

|---------|-------------|

| aws events put-events | Publish events |

Best Practices

Event Design

  • Use meaningful source names — company.service.component
  • Use descriptive detail-types — Order Created, User Signed Up
  • Include correlation IDs for tracing
  • Keep events small (< 256 KB)
  • Use versioning for event schemas
# Good event structure
{
    'Source': 'mycompany.orders.api',
    'DetailType': 'Order Created',
    'Detail': json.dumps({
        'version': '1.0',
        'correlation_id': 'req-abc-123',
        'timestamp': '2024-01-15T10:30:00Z',
        'order_id': '12345',
        'data': {...}
    })
}

Reliability

  • Use DLQs for failed deliveries
  • Implement idempotency in consumers
  • Monitor failed invocations
  • Use archive and replay for recovery

Security

  • Use resource policies to control access
  • Enable encryption with KMS
  • Use IAM roles for targets

Cost Optimization

  • Use specific event patterns to reduce matches
  • Batch events when publishing (up to 10 per call)
  • Archive selectively — not all events

Troubleshooting

Rule Not Triggering

Debug:

# Check rule status
aws events describe-rule --name my-rule

# Check targets
aws events list-targets-by-rule --rule my-rule

# Test event pattern
aws events test-event-pattern \
  --event-pattern '{"source": ["my-app"]}' \
  --event '{"source": "my-app", "detail-type": "Test"}'

Common causes:

  • Rule disabled
  • Event pattern doesn't match
  • Target permissions missing

Lambda Not Invoked

Check Lambda permissions:

aws lambda get-policy --function-name MyFunction

Required permission:

{
  "Principal": "events.amazonaws.com",
  "Action": "lambda:InvokeFunction",
  "Resource": "function-arn",
  "Condition": {
    "ArnLike": {
      "AWS:SourceArn": "rule-arn"
    }
  }
}

Events Not Reaching Custom Bus

Check:

  • Publishing to correct bus name
  • Event format is valid JSON
  • Put events has proper permissions
# Test publish
aws events put-events \
  --entries '[{
    "Source": "test",
    "DetailType": "Test Event",
    "Detail": "{}",
    "EventBusName": "my-app-events"
  }]'

Viewing Failed Events

# Enable CloudWatch metrics
aws events put-rule \
  --name my-rule \
  --event-pattern '...' \
  --state ENABLED

# Check FailedInvocations metric
aws cloudwatch get-metric-statistics \
  --namespace AWS/Events \
  --metric-name FailedInvocations \
  --dimensions Name=RuleName,Value=my-rule \
  --start-time $(date -d '1 hour ago' -u +%Y-%m-%dT%H:%M:%SZ) \
  --end-time $(date -u +%Y-%m-%dT%H:%M:%SZ) \
  --period 300 \
  --statistics Sum

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How to use it

Copy the folder

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