Message Queues Agent Skill

by cosmicstack-labs

RabbitMQ, Kafka, SQS, pub/sub, competing consumers, dead letter queues, and event streaming

534 tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

365

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/cosmicstack-labs/mercury-agent-skills --skill message-queues

The instruction itself

11 sections, as written by the author

Message Queues

Design reliable message-driven systems.

Queue Types

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

RabbitMQ Patterns

Work Queues (Competing Consumers)

Producer → Queue → Consumer 1
                 → Consumer 2
                 → Consumer 3

Messages distributed round-robin
Ack on success, nack on failure (requeue or DLQ)
Prefetch count controls concurrency

Pub/Sub (Exchange → Binding → Queue)

Fanout: broadcast to all queues
Direct: route by routing key
Topic: route by pattern (user.*, user.created)
Headers: route by header values

Kafka Patterns

Topics & Partitions

Messages within a partition are ordered
Partitions enable parallelism
Consumer group = one instance per partition

Producer

await producer.send({
  topic: 'order-events',
  messages: [{ key: orderId, value: JSON.stringify(order) }],
});

Consumer

await consumer.run({
  eachMessage: async ({ topic, partition, message }) => {
    await processOrder(message.value);
  },
});

Dead Letter Queues

Messages that can't be processed go to DLQ
Analyze DLQ periodically for systemic issues
DLQ messages can be replayed after fix
Set max retry count before DLQ

Best Practices

Idempotent consumers (same message processed twice = safe)
Monitor queue depth, consumer lag, error rate
Set message TTL to prevent infinite backlog
Use structured message schemas (Avro, Protobuf)
Test with network failures and consumer crashes

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How to use it

Copy the folder

Take cosmicstack-labs/message-queues from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.