Name: pantheon-ai/cfn-behavior-validator
Rating: 100 (1 reviews)
Author: pantheon-ai

pantheon-ai/cfn-behavior-validator

Creates test stacks, analyzes CloudFormation events, and compares actual vs documented update behavior to validate whether resource property changes trigger replacement or in-place updates. Use when: a user wants to test if a CFN property change causes resource replacement; when investigating stack update behavior or "Update requires" documentation accuracy; when validating whether a workaround (e.g. hash-based logical IDs) is actually necessary; when questioning UpdateRequiresReplacement behavior for immutable properties; when empirical evidence is needed before an architectural decision involving CDK or CloudFormation stack updates.

100

1.12x

Quality

100%

Does it follow best practices?

Impact

100%

1.12x

Average score across 5 eval scenarios

Securityby

Advisory

Suggest reviewing before use

Evaluation results

100%

Investigate SNS Subscription Endpoint Change Behavior

Complete validation workflow research and documentation

Criteria

Without context

With context

CFN docs lookup

100%

Community research

100%

Hypothesis stated

100%

Non-prod environment

75%

100%

Resource isolation

100%

Observable criteria

100%

CFN events inspection

25%

100%

Required report fields

100%

Behavior classification

100%

Workaround decision

100%

Design Test Infrastructure for Lambda Memory Configuration

CDK test stack design and parameterization

Criteria

Without context

With context

Context parameterization

100%

Minimal resources

100%

Single property focus

100%

Observable criteria defined

100%

Success criteria explicit

100%

Verification method

100%

Valid CDK syntax

100%

12%

Execute DynamoDB Table Class Change Validation

Deployment commands and event inspection

Criteria

Without context

With context

Initial deployment command

100%

No approval flag

100%

Resource ARN recording

100%

Redeploy after change

100%

describe-stack-events command

100%

Resource type filter

100%

Event field extraction

100%

Replacement indicators

100%

Update indicators

100%

Failure handling

100%

Handle Unexpected Behavior in RDS Instance Storage Change

Validation gates and repeatability testing

Criteria

Without context

With context

Initial deployment failure gate

100%

Unexpected behavior gate

83%

100%

Ambiguous results handling

100%

Repeat test condition

100%

Cleanup between tests

100%

Pre-repeat verification

100%

Additional data collection

100%

Multiple decision points

100%

Stop conditions clear

100%

33%

Automate ECS Task Definition Memory Change Validation

Helper scripts and automation tools

Criteria

Without context

With context

Real-time event streaming

100%

watch-cfn-events reference

25%

100%

Resource comparison mentioned

100%

compare-resources reference

10%

100%

Before state capture

100%

After state capture

100%

Sequential workflow

100%

Evaluated: about 1 month ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Investigate SNS Subscription Endpoint Change Behavior Design Test Infrastructure for Lambda Memory Configuration Execute DynamoDB Table Class Change Validation Handle Unexpected Behavior in RDS Instance Storage Change Automate ECS Task Definition Memory Change Validation