How does this skill help me avoid Docker deployment failures?

This skill analyzes your Docker Compose files and .env variables to pinpoint identical host port assignments, preventing the common 'address already in use' errors before you attempt to deploy.

Can the Port Clash Doctor detect conflicts hidden within environment variables?

Yes, the skill is designed to parse both hardcoded port strings and those defined via variables in .env files, ensuring it catches hidden conflicts that manual inspection might miss.

Which AI agents and file formats are compatible with this skill?

The skill works with any standard Docker Compose (YAML) configuration and is compatible with most AI agents that support file analysis and code debugging workflows.

Does the skill provide suggestions for how to fix a port collision?

Beyond just identifying the clash, the skill suggests available alternative port mappings based on common conventions, helping you reconfigure your services quickly and safely.

What is included with this 'freebie' skill download?

You receive the specialized port-scanning logic and integration instructions for your AI agent; as a 'freebie' listing, you get full access to the current version at no cost.

Do I need to give the AI agent root access to my local Docker environment to use this?

No, this skill operates as a static analyzer for your configuration files, meaning it can identify potential conflicts in your code without needing access to your live system or Docker daemon.

freebie port clash doctor

Example session with this skill installed

Check my docker-compose.yml for port conflicts. I have a web app on 8080, a db on 5432, and I just added a dashboard also trying to use 8080.

Read your context and instructions
Compiled the freebie port clash
Generated the document

I have analyzed your docker-compose.yml file and identified a port collision on the host machine.

Port Conflict Audit

Service Name	Host Port	Container Port	Status	Recommendation
`web-app`	`8080`	`3000`	CONFLICT	Keep as is or move to `8081`
`dashboard`	`8080`	`80`	CONFLICT	Change host port to `8082`
`database`	`5432`	`5432`	OK	No action required

Resolution Steps

The services web-app and dashboard are both attempting to bind to port 8080 on your host machine. This will cause the second service to fail on startup.

Update your docker-compose.yml as follows:

services:
  web-app:
    image: node:18
    ports:
      - "8081:3000" # Changed from 8080
    networks:
      - app-tier

  dashboard:
    image: nginx:latest
    ports:
      - "8082:80"   # Changed from 8080
    networks:
      - app-tier

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Next steps

Apply the port changes to your docker-compose.yml.
Run docker-compose up -d to restart the services.
Verify the dashboard is accessible at http://localhost:8082.

freebie-port-clash-doctor.pdf

PDF · document

Generated

Example file from a real run - the skill writes it into your workspace.

Connects securely to your tools. The creator never sees your data.

About this skill

The problem

Running multiple containerized services often leads to port collisions, where two services attempt to bind to the same host port. Identifying these overlaps in large docker-compose.yml files or hidden .env variables is manual and error-prone.

What it does

Scans ports: directives across all services in your configuration files.
Identifies duplicate host port mappings that prevent containers from starting.
Detects network bridge issues and binding conflicts.
Provides safe, alternative port mapping suggestions to resolve clashes.

Frameworks & tools

Docker, Docker Compose, and environment configuration files (.env).

Why this beats prompting it yourself

General LLMs often miss port conflicts buried in multi-service files or external environment variables. This skill uses a specialized scanning logic focused specifically on networking bridge integrity, ensuring no collision goes unnoticed before you run docker-compose up.

Use cases

Debug "address already in use" errors during local development.
Audit complex homelab setups with dozens of containers.
Validate new service additions against existing port bindings.
Refactor static port mappings to avoid host-level conflicts.

How to install

Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.

~30 seconds

1
Download the ZIP
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2
Unzip into your skills folder
Every agent reads skills from one folder on your machine. Drop the unzipped folder in there.
3
Ask your agent to use it
Restart the agent if it was already running. It picks the skill up automatically - no config needed.

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freebie port clash doctor