aws-cloudformation-vpc

AWS CloudFormation patterns for VPC infrastructure. Use when creating VPCs, Subnets, Route Tables, NAT Gateways, Internet Gateways, and implementing template structure with Parameters, Outputs, Mappings, Conditions, and cross-stack references.

Install with Tessl CLI

npx tessl i github:giuseppe-trisciuoglio/developer-kit --skill aws-cloudformation-vpc

What are skills?

Quality

82%

Does it follow best practices?

Impact

Pending

No eval scenarios have been run

SKILL.md

Review

Evals

Discovery

100%

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

This is a strong skill description that clearly defines its scope (AWS CloudFormation VPC patterns), lists specific capabilities (VPCs, Subnets, Route Tables, etc.), and includes explicit 'Use when' guidance with natural trigger terms. The description uses proper third-person voice and provides enough detail to distinguish it from other AWS or infrastructure skills.

Dimension	Reasoning	Score
Specificity	Lists multiple specific concrete actions and components: 'creating VPCs, Subnets, Route Tables, NAT Gateways, Internet Gateways' and template features like 'Parameters, Outputs, Mappings, Conditions, and cross-stack references'.	3 / 3
Completeness	Clearly answers both what ('AWS CloudFormation patterns for VPC infrastructure' plus specific components) and when ('Use when creating VPCs, Subnets, Route Tables...') with explicit trigger guidance.	3 / 3
Trigger Term Quality	Excellent coverage of natural terms users would say: 'CloudFormation', 'VPC', 'Subnets', 'Route Tables', 'NAT Gateways', 'Internet Gateways', 'Parameters', 'Outputs', 'cross-stack references' - all terms AWS users naturally use.	3 / 3
Distinctiveness Conflict Risk	Highly distinctive with clear niche: specifically AWS CloudFormation for VPC infrastructure. The combination of CloudFormation + VPC + specific networking components creates a unique, non-conflicting scope.	3 / 3
	Total	12 / 12 Passed

Implementation

64%

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

This is a comprehensive CloudFormation VPC skill with excellent actionability through complete, executable templates and CLI commands. However, it's verbose for a skill document, including explanatory content Claude already knows and lacking integrated validation workflows. The content would benefit from being split across multiple files with a leaner main skill.

Suggestions

Add an explicit workflow section at the top showing the sequence: 1) Write template → 2) Validate with cfn-lint → 3) Create change set → 4) Review changes → 5) Execute, with validation checkpoints

Move the 'Template Structure' and 'Best Practices' sections to separate reference files (TEMPLATE-STRUCTURE.md, BEST-PRACTICES.md) and link to them

Remove the 'When to Use' section and 'Template Sections Overview' explanations - Claude knows when to use VPC templates and what CloudFormation sections are

Dimension	Reasoning	Score
Conciseness	The skill is comprehensive but includes some unnecessary sections like 'When to Use' that Claude can infer, and the 'Template Structure' section explains concepts Claude already knows. The extensive code examples are valuable but could be more condensed.	2 / 3
Actionability	Excellent actionability with fully executable CloudFormation templates, specific CLI commands for validation, drift detection, and change sets. All code is copy-paste ready with complete resource definitions.	3 / 3
Workflow Clarity	While individual operations are clear, the skill lacks explicit validation checkpoints in the main VPC creation workflows. The 'Validate Before Deployment' section exists but isn't integrated into a clear sequence with feedback loops for the template creation process.	2 / 3
Progressive Disclosure	References to EXAMPLES.md and REFERENCE.md are present, but the main document is quite long (~700 lines) with content that could be split out. The Template Structure section and Best Practices could be separate files to keep the main skill leaner.	2 / 3
	Total	9 / 12 Passed

Validation

68%

Warnings & errors only

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

Validation — 11 / 16 Passed

Validation for skill structure

Criteria	Description	Result
skill_md_line_count	SKILL.md is long (1190 lines); consider splitting into references/ and linking	Warning
allowed_tools_field	'allowed-tools' contains unusual tool name(s)	Warning
metadata_version	'metadata' field is not a dictionary	Warning
license_field	'license' field is missing	Warning
frontmatter_unknown_keys	Unknown frontmatter key(s) found; consider removing or moving to metadata	Warning

	Total	11 / 16 Passed

Reviewed: about 1 month ago

Table of Contents

Discovery Implementation Validation

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