CtrlK
BlogDocsLog inGet started
Tessl Logo

aws-cloudformation

Authors, validates, and troubleshoots AWS CloudFormation templates. Covers template authoring with secure defaults, pre-deployment validation (cfn-lint, cfn-guard, change sets), CloudFormation Express mode for faster deployments, and root-cause diagnosis of failed stacks using CloudFormation events and CloudTrail correlation.

69

Quality

83%

Does it follow best practices?

Run evals on this skill

Adds up to 20 points to the overall score

View guide

SecuritybySnyk

Low

Low-risk findings worth noting

SKILL.md
Quality
Evals
Security

Quality

Content

92%Weight 40%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

The body is highly actionable, well-sequenced with validation checkpoints, and cleanly delegates detail to real one-level reference files. The only weakness is mild boilerplate repetition across the safety sections that could be tightened.

DimensionReasoningScore

Conciseness

Dense and directive with no basic-concept padding, but the repeated 'You MUST follow ... in template-safety-guidance.md before advising or editing' boilerplate across six safety sections and re-explanation of the describe-events vs describe-stack-events distinction are minor trim opportunities.

4 / 5

Actionability

Provides fully executable, copy-paste-ready commands and concrete defaults (describe-events filters, Express deployment config, !Sub naming, dynamic secrets references, wc -c) covering the common cases for each task.

5 / 5

Workflow Clarity

Workflows are clearly sequenced with explicit validation checkpoints (three-layer validation pipeline with a FAIL-halt gate, wc -c before/after edits) and feedback loops for the destructive/batch operations involved.

5 / 5

Progressive Disclosure

SKILL.md is a clear overview with well-signaled, one-level-deep references to real SOP files in references/ (all listed paths exist), plus decision and troubleshooting tables for easy navigation.

5 / 5

Total

19

/

20

Passed

Description

75%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

The description is specific, distinctive, and covers the full CloudFormation lifecycle with concrete tooling, but it omits any explicit 'when to use' trigger guidance, which caps completeness. Adding a 'Use when...' clause would lift the completeness score.

Suggestions

Append an explicit trigger clause, e.g. 'Use when authoring, validating, deploying, or troubleshooting AWS CloudFormation templates.'

Add natural synonyms or file-type cues users might say (e.g. 'CloudFormation templates (.json/.yaml)', 'stack failures') to broaden trigger-term coverage.

Keep the current concrete action list; it is the strongest dimension.

DimensionReasoningScore

Specificity

Lists multiple specific concrete actions across the lifecycle — authoring with secure defaults, pre-deployment validation (cfn-lint, cfn-guard, change sets), Express-mode deployment, and root-cause diagnosis via CloudFormation events and CloudTrail — matching the comprehensive-coverage anchor.

5 / 5

Completeness

The 'what' is clear and detailed, but there is no 'Use when...' clause or equivalent explicit trigger guidance, which caps completeness at 3 per the judging guidelines.

3 / 5

Trigger Term Quality

Strong natural-term coverage ('AWS CloudFormation', 'template', 'validate', 'deploy', 'failed stacks', tool names), but missing common synonyms and file-extension variants that would push it to a 5.

4 / 5

Distinctiveness Conflict Risk

A clear CloudFormation-lifecycle niche with distinctive tooling (cfn-lint, cfn-guard, Express mode, CloudTrail) and minimal conflict risk with other skills.

5 / 5

Total

17

/

20

Passed

Validation

100%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository
aws/agent-toolkit-for-aws
Reviewed

Table of Contents

Is this your skill?

If you maintain this skill, you can claim it as your own. Once claimed, you can manage eval scenarios, bundle related skills, attach documentation or rules, and ensure cross-agent compatibility.