Prowler is an open-source cloud security platform that checks cloud environments for security issues and compliance with standards such as CIS, NIST, and GDPR. Security teams use it to assess configurations, prioritize findings, produce reports, and guide remediation.
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 skills add prowler-cloud/prowler --skill prowler-mcpgit clone --depth 1 https://github.com/prowler-cloud/prowlerWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/prowler-cloud/prowler/prowler-mcp)<a href="https://agentmods.dev/skills/prowler-cloud/prowler/prowler-mcp"><img src="https://agentmods.dev/badge/skills/prowler-cloud/prowler/prowler-mcp/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/prowler-cloud/prowler/prowler-mcp"><img src="https://agentmods.dev/badge/skills/prowler-cloud/prowler/prowler-mcp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What 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 5.1 | $0.00057 | $0.00795 |
| Opus 5 | $0.00028 | $0.00398 |
| Sonnet 5 | $0.00011 | $0.00159 |
| Haiku 4.5 | $0.00006 | $0.00080 |
Grade A, and why
prowler-mcp 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 9d 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 — 88 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Overview
The Prowler MCP Server uses three sub-servers with prefixed namespacing:
| Sub-Server | Prefix | Auth | Purpose |
|---|---|---|---|
| Prowler | prowler_* |
Required | Prowler Cloud, Private Cloud & Local Server management tools |
| Prowler Hub | prowler_hub_* |
No | Security checks catalog |
| Prowler Docs | prowler_docs_* |
No | Documentation search |
For complete architecture, patterns, and examples, see docs/developer-guide/mcp-server.mdx.
Critical Rules (Prowler Tools Only)
Tool Implementation
- ALWAYS: Extend
BaseTool(auto-registered viatool_loader.py, only public methods from the class are exposed as a tool) - NEVER: Manually register BaseTool subclasses
- NEVER: Import tools directly in server.py
Models
- ALWAYS: Use
MinimalSerializerMixinfor responses - ALWAYS: Implement
from_api_response()factory method - ALWAYS: Use two-tier models (Simplified for lists, Detailed for single items)
- NEVER: Return raw API responses
API Client
- ALWAYS: Use
self.api_clientsingleton - ALWAYS: Use
build_filter_params()for query parameters - NEVER: Create new httpx clients
Hub/Docs Tools
Use @mcp.tool() decorator directly—no BaseTool or models required.
Quick Reference: New Prowler Tool
- Create tool class in
prowler_app/tools/extendingBaseTool - Create models in
prowler_app/models/usingMinimalSerializerMixin - Tools auto-register via
tool_loader.py
QA Checklist (Prowler Tools)
- Tool docstrings describe LLM-relevant behavior
- Models use
MinimalSerializerMixin - API responses transformed to simplified models
- Failures are raised, never returned. A returned error dict is reported
as a success. Raise
InvalidArgumentfor a bad argument, letProwlerAPIError/ProwlerAPIUnreachablepropagate, and raiseToolErrorwithout afromclause only for a sentencelib/errors.pycannot know (a resource name, a precondition, the next tool to call) - Parameters use
Field()with descriptions - No hardcoded secrets
- Tests added under
mcp_server/tests/
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 9d ago First seen · 88 lines · 57 tokens per session scan A 6e2de0512eb8
prowler-mcp is a skill published in the GitHub repository prowler-cloud/prowler (14,767 stars, last pushed yesterday), licensed Apache-2.0. It adds 57 tokens to every session and 795 once invoked, about $0.0003 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.
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