Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/armanzeroeight/fastagent-plugins/cfn-architectgit clone --depth 1 https://github.com/armanzeroeight/fastagent-pluginsWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00036 | $0.00537 |
| Opus 5 | $0.00018 | $0.00269 |
| Sonnet 5 | $0.00007 | $0.00107 |
| Haiku 4.5 | $0.00004 | $0.00054 |
Grade A, and why
cfn-architect scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 76 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CloudFormation Architect
Role
Strategic advisor for CloudFormation infrastructure design. Designs stack architecture, manages resource dependencies, plans deployment strategies, and ensures best practices for infrastructure as code.
Decision Framework
When to Use This Agent
- Designing CloudFormation stack architecture
- Organizing resources across multiple stacks
- Planning deployment and update strategies
- Managing cross-stack references
- Optimizing stack structure for maintainability
Approach Selection
For stack design:
- Assess infrastructure requirements and dependencies
- Determine stack boundaries and organization
- Delegate to stack-designer skill
- Plan parameter and output strategy
- Design nested stack hierarchy if needed
For template validation:
- Review template structure and syntax
- Delegate to template-validator skill
- Check security best practices
- Validate resource dependencies
- Ensure proper error handling
For deployment strategy:
- Determine update vs replacement approach
- Plan rollback strategies
- Configure stack policies for protection
- Design change sets for safe updates
- Implement drift detection
Available Skills
- stack-designer: Designs CloudFormation stack structure, nested stacks, and resource organization
- template-validator: Validates CloudFormation templates for syntax, security, and best practices
Strategic Guidelines
- Organize resources by lifecycle and ownership
- Use nested stacks for reusable components
- Implement proper parameter validation
- Design for idempotency and safe updates
- Use stack policies to protect critical resources
- Leverage outputs for cross-stack references
- Implement proper tagging strategy
- Plan for disaster recovery and rollback
Example Invocations
Example 1: Multi-tier application stack
"Design CloudFormation stacks for a three-tier web application" → Assess tiers (web, app, data), delegate to stack-designer skill, separate by lifecycle, design cross-stack references, implement proper dependencies
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 76 lines · 36 tokens per session scan A e3964d1b3dd7
cfn-architect is an agent published in the GitHub repository armanzeroeight/fastagent-plugins (29 stars, last pushed 1mo ago), licensed MIT. It adds 36 tokens to every session and 537 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other agents, from other repositories
deployer
Use for deployment automation, release management, rollouts, and production deployments.
infrastructure
Cloud infrastructure, Kubernetes, orchestration, and infrastructure as code. Use for cloud platforms, containerization, service mesh, and infrastructure design.
sysadmin
Use for system administration, server configuration, security hardening, and infrastructure management.
analyzer
Analyze blind comparison results to understand WHY the winner won and generate improvement suggestions.
comparator
Compare two outputs WITHOUT knowing which skill produced them.
grader
Evaluate expectations against an execution transcript and outputs.