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This skill should be used when the user asks to "analyze a Dockerfile", "optimize Docker layers", "validate docker-compose", "check container best practices", or "audit Docker configurations".
Passed 21 of 22 test cases with the skill, and 19 of 22 without it.
2 fixed19 passed either way1 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 2 test cases the skill fixed. Same model, same prompt, with and without the skill.
We are having trouble with our multi-service setup crashing on local startup. Can you run a thorough check on our docker-compose.yml file to identify host port collisions, circular service dependencies, and missing volume or network definitions?
| Checked | Without skill | With skill |
|---|---|---|
| Asks the user to specify or confirm the output mode choice between human-readable and JSON format before running validation. | Missed | Passed |
The instructions your model reads when the skill loads.
Category: Engineering Domain: Container Development & Optimization
The Docker Development skill provides automated analysis of Dockerfiles and docker-compose configurations. It identifies layer optimization opportunities, security issues, best practice violations, and compose service misconfigurations. Use this skill to enforce container standards across your team and catch issues before they reach production.
Before running the analysis, confirm these inputs. If any is unknown or vague, ASK — do not assume:
--file and which tool runs)--security-only/--check-ports)--format json and whether findings gate a pipeline)Stop rule: ask only the 2-3 that most change the output. If the user says "just draft it," proceed and list your assumptions at the top of the artifact.
# Analyze a Dockerfile for best practices
python scripts/dockerfile_analyzer.py --file Dockerfile
# Analyze with JSON output
python scripts/dockerfile_analyzer.py --file Dockerfile --format json
# Validate a docker-compose file
python scripts/compose_validator.py --file docker-compose.yml
# Check for port conflicts across compose files
python scripts/compose_validator.py --file docker-compose.yml --check-ports
Analyzes Dockerfiles for best practices, security issues, and optimization opportunities.
test cases passed, vs 19 / 22 without
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