Prowler vs AWS FinOps MCP: AI Skills for Cloud Engineers in 2026

Two AI skills for cloud engineers keep showing up in the same threads on Reddit and Hacker News: Prowler and AWS FinOps MCP. People assume they overlap. They don't.

Short version:

• Prowler is a security and compliance scanner. It tells you where your AWS account is exposed.
• AWS FinOps MCP is a cost optimizer. It tells you where your AWS account is wasting money.

Different jobs. Most cloud teams need both, just at different points in the lifecycle. This guide walks through what each skill does, when to install each, and the install commands you can run in Claude Code today.

Quick comparison

Both are read-only, both cost nothing beyond AWS API calls, and both ship as installable skills or MCP servers for Claude Code. From there, the use cases diverge.

What Prowler does

Prowler scans your cloud accounts against 90+ compliance frameworks and 800+ individual security checks. It's been around since 2018 as a CLI tool, and the team shipped a Claude Code skill plus MCP server in early 2025.

A typical Prowler run produces: 1. A finding list (PASS / FAIL / INFO) per check 2. Severity tags (critical / high / medium / low) 3. Remediation steps for each FAIL 4. A compliance score per framework (for example, "CIS AWS Foundations: 72% pass")

What I use it for:

• Pre-launch audit before a new product goes live. Catches public S3 buckets, missing MFA, default security groups.
• Quarterly compliance check for SOC 2 or HIPAA-adjacent customers.
• CI/CD gate on Terraform changes. Run prowler in dry mode and block merges that introduce new criticals.

Strengths:

• Multi-cloud (AWS, Azure, GCP, Kubernetes). Most competitors are AWS-only.
• Free and open source (Apache 2.0)
• The check catalog is one of the best maintained in the industry

Weaknesses:

• First-time scan on a busy account can take 30-60 minutes
• Some checks throw false positives until you tune the suppressions file
• Documentation assumes you already know your CIS Benchmark version

What AWS FinOps MCP does

AWS FinOps MCP Server is a Model Context Protocol server that exposes AWS Cost Explorer, Cost and Usage Reports, and Trusted Advisor data to Claude Code. Once installed, you ask Claude questions like "what services drove the biggest cost increase last month" and Claude pulls real account data to answer.

A typical workflow: 1. Install the skill, authenticate with your AWS profile 2. Ask Claude for the past 30-day cost breakdown by service 3. Drill into the top driver (RDS, EC2, NAT Gateway, S3) 4. Get optimization recommendations (Reserved Instances, Savings Plans, idle resource cleanup) 5. Export findings as a Slack-ready summary

What it's best at:

• Cost anomaly hunting. "Why did EC2 spend jump 22% in March?"
• Right-sizing recommendations. Claude reads CloudWatch utilization and suggests instance downgrades.
• Reserved Instance and Savings Plan analysis. ROI math for committing to 1-year vs 3-year terms.

Strengths:

• Plays well with FinOps team workflows (monthly business reviews)
• Surfaces data that Cost Explorer hides 3 clicks deep
• Read-only, so no risk of changing resources by accident

Weaknesses:

• AWS-only (no Azure, no GCP)
• Requires Cost Explorer to be enabled (some orgs disable it for IAM reasons)
• Doesn't replace a real FinOps platform like Vantage or CloudZero for large orgs

When to install which

The decision is less "Prowler OR AWS FinOps MCP" and more "what problem is on my desk this week."

Install Prowler if:

• You're preparing for a security audit or compliance certification
• You've never audited the cloud accounts you inherited
• Your team uses Terraform or CDK and you want a CI gate
• You manage Azure or GCP (Prowler is multi-cloud, AWS FinOps MCP isn't)

Install AWS FinOps MCP if:

• The CFO is asking why the AWS bill went up
• You suspect orphaned resources you can't find through Cost Explorer alone
• You need a monthly cost optimization conversation with Claude
• Your AWS spend is over $5K/month and nobody owns optimization

Most teams I've talked to in 2026 run both. Prowler weekly, FinOps MCP daily for the first month after install and then on cost spikes.

Install commands

Both skills install via Claude Code's plugin system. Run from your terminal:

# Prowler
/plugin marketplace add prowler-cloud/prowler-claude
/plugin install prowler@prowler-claude

# AWS FinOps MCP
/plugin marketplace add aws-samples/aws-finops-mcp-server
/plugin install aws-finops-mcp-server@aws-samples

Both require AWS credentials configured (~/.aws/credentials or environment variables). Read-only IAM roles are fine, and recommended, since neither skill should write to your account.

For Prowler specifically, the minimum IAM permissions are documented in their repo. Don't use AdministratorAccess just because it's easier.

Security note before you install

Skills run code on your machine with your AWS credentials. Before installing either, check: 1. The repo is the official one (check the GitHub stars, recent commits, maintainer) 2. The MCP server is configured read-only at the IAM level 3. Your AWS credentials are scoped to a single AWS profile with minimum required permissions

This is basic supply chain hygiene. Two MCP servers in late 2025 shipped with auto-publishing telemetry that exfiltrated cost data to a third party. Both have been patched, but the lesson sticks: vet what you install.

Real example: a $40K monthly AWS bill cut by $11K

A friend who runs a SaaS for property managers asked me to look at his AWS bill in February. Spend had crept from $28K/mo to $40K/mo over 6 months and nobody on the team owned it.

We installed AWS FinOps MCP on Monday morning and ran one prompt: "Summarize the top 10 cost drivers vs the same month last year, with the largest percentage increases first."

The answer came back in 45 seconds: 1. RDS db.r6g.4xlarge instances running 24/7 in three regions for what was a dev/staging environment 2. A NAT Gateway pattern that routed all internal VPC traffic through a single AZ at $0.045/GB 3. CloudWatch Logs retention set to "never expire" since 2021 4. S3 buckets in Glacier Deep Archive being scanned hourly by a forgotten Lambda function

We fixed three of the four within a week. The fourth (NAT Gateway re-architecture) took a sprint. Total monthly savings: $11,200. Time invested: ~12 hours.

The FinOps MCP didn't fix anything by itself. It surfaced what Cost Explorer hid. The fix work was still manual. That's the right division of labor for a read-only skill.

A typical month with both installed

Here's the cadence I see working teams running:

• Monday weekly Prowler scan, posted to Slack with critical findings
• Daily AWS FinOps MCP check-in during morning standup ("any cost anomalies?")
• Quarterly Prowler compliance report for the security team
• Monthly cost review using AWS FinOps MCP findings as the agenda

If you only have time to install one this month, start with the one that matches the current pain. Audit coming up? Prowler. Bill rising? FinOps MCP.

FAQ

Can these skills modify my AWS account? No. Both are read-only at the design level. Prowler scans, FinOps MCP queries. Neither writes. Always confirm by attaching read-only IAM roles when you set them up.

Is there a Prowler equivalent that's commercial? Yes. Wiz, Lacework, and Orca all do cloud security posture management at a price. For a solo or small team, Prowler covers 80% of what they offer at 0% of the cost.

Will AWS FinOps MCP work with multi-account organizations? Yes, if your AWS profile has cross-account access. The skill calls Cost Explorer on whichever accounts your profile can read. For consolidated billing, point it at the management account.

Do I need to install both? No. Pick the one that solves the problem you have this quarter. You can always add the other.

What about Snyk or Trail of Bits? Different scope. Snyk scans application code for vulnerabilities (npm packages, Python dependencies). The Trail of Bits Security skill audits codebases for security patterns. Prowler audits the cloud infrastructure side. Use them together, not as substitutes.

Bottom line

Prowler tells you where your cloud accounts are at risk. AWS FinOps MCP tells you where they're bleeding money. Both run as Claude Code skills, both are read-only, both cost nothing beyond AWS API calls.

If you're a cloud engineer in 2026 and don't have at least one of these installed, you're flying blind. Start with the one that matches what your team is being asked to fix this quarter.

For more skills geared at cloud and infrastructure work, browse our full skill list for cybersecurity professionals.