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mcp-server-review

Name: Mcp Server Review
Author: OWASP

// Security review of MCP (Model Context Protocol) server implementations and configurations. Use when auditing MCP server source code, evaluating third-party MCP servers before installation, or reviewing Claude Code MCP integrations for overpermissioning, injection risks, and data exposure.

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stars:78

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updated:May 17, 2026 at 20:08

SKILL.md

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name	mcp-server-review
description	Security review of MCP (Model Context Protocol) server implementations and configurations. Use when auditing MCP server source code, evaluating third-party MCP servers before installation, or reviewing Claude Code MCP integrations for overpermissioning, injection risks, and data exposure.
license	CC-BY-4.0

MCP Server Security Review

Audit an MCP server by following the full procedure in plays/mcp-server-review.md.

Steps

Transport & Authentication — Check transport type (stdio vs HTTP/SSE), authentication on network transports, TLS enforcement, CORS policy, origin validation.
Tool Permission Audit — For each exposed tool: document what it claims to do vs what it actually does (read source). Classify as READ-ONLY, MUTATION, DESTRUCTIVE, NETWORK, or CREDENTIAL-ACCESS. Flag tools with broader capabilities than descriptions suggest, free-form inputs, or credential access.
Input Validation & Injection — For each tool parameter: check for command injection (shell interpolation), path traversal (../ in file paths), SQL injection (unparameterized queries), SSRF (user-supplied URLs hitting internal services), and template injection.
Data Exposure — Assess MCP resources for secrets/PII leakage, tool outputs for excessive data, error messages for internal paths/stack traces, and logging for sensitive data capture.
Scope & Sandboxing — Check file system restrictions, network scope (can it reach cloud metadata 169.254.169.254?), process permissions, resource limits, and dependency surface.
Supply Chain — Verify source trustworthiness, run SCA on dependencies, check for lockfiles and reproducible builds, assess update mechanism.
Client Configuration — Review MCP client config for absolute/specific server paths, minimized env var passthrough, and command injection safety in args.

Output

Server overview, tool risk matrix, findings using templates/finding.md, and specific configuration recommendations.

OWASP References

LLM01: Prompt Injection (via tool descriptions and outputs)
LLM02: Insecure Output Handling
LLM06: Excessive Agency (overpermissioned tools)
A01: Broken Access Control
A03: Injection

related-skills.json

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agent-security-audit.md

from "OWASP/secure-agent-playbook"

Audit AI agent configurations for security risks — excessive permissions, prompt injection surfaces, data exfiltration paths, and missing guardrails. Use when reviewing CLAUDE.md files, MCP configs, agent orchestration code, or any AI agent setup.

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agentic-ai-risk-assess.md

from "OWASP/secure-agent-playbook"

Assess agentic AI applications against the OWASP Top 10 for Agentic Applications 2026. Use when reviewing autonomous AI agents, multi-agent systems, or agentic workflows for security risks including goal hijacking, tool misuse, privilege abuse, and rogue agent behavior.

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llm-risk-assess.md

from "OWASP/secure-agent-playbook"

Comprehensive LLM security assessment against OWASP Top 10 for LLM Applications 2025. Use when reviewing LLM-integrated applications, RAG pipelines, chatbots, AI agents, or GenAI features. Covers prompt injection, data poisoning, supply chain, excessive agency, and more with real-world attack scenarios and testing methodologies.

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prompt-injection-test.md

from "OWASP/secure-agent-playbook"

Test LLM-integrated applications against known prompt injection techniques, evasion methods, and attack intents using the Arcanum PI Taxonomy. Use when red-teaming AI apps, validating guardrails, or deepening LLM01 (Prompt Injection) assessments.

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api-security-review.md

from "OWASP/secure-agent-playbook"

Comprehensive API security review against OWASP API Security Top 10 (2023). Use when reviewing OpenAPI/Swagger specs, auditing REST/GraphQL/gRPC implementations, testing authentication mechanisms, or checking API gateway configurations. Covers BOLA/IDOR, broken auth, mass assignment, rate limiting, SSRF, and more with real-world attack scenarios.

2026-05-1778

code-review-security.md

from "OWASP/secure-agent-playbook"

Security-focused code review mapped to OWASP Top 10 and ASVS. Use when reviewing pull requests, auditing files or modules for vulnerabilities, or performing pre-merge security gate checks. Covers injection, auth, authorization, cryptography, data exposure, misconfiguration, and deserialization.

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package.json

"author": "OWASP"

"repository": "OWASP/secure-agent-playbook"

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name	mcp-server-review
description	Security review of MCP (Model Context Protocol) server implementations and configurations. Use when auditing MCP server source code, evaluating third-party MCP servers before installation, or reviewing Claude Code MCP integrations for overpermissioning, injection risks, and data exposure.
license	CC-BY-4.0

MCP Server Security Review

Audit an MCP server by following the full procedure in plays/mcp-server-review.md.

Steps

Transport & Authentication — Check transport type (stdio vs HTTP/SSE), authentication on network transports, TLS enforcement, CORS policy, origin validation.
Tool Permission Audit — For each exposed tool: document what it claims to do vs what it actually does (read source). Classify as READ-ONLY, MUTATION, DESTRUCTIVE, NETWORK, or CREDENTIAL-ACCESS. Flag tools with broader capabilities than descriptions suggest, free-form inputs, or credential access.
Input Validation & Injection — For each tool parameter: check for command injection (shell interpolation), path traversal (../ in file paths), SQL injection (unparameterized queries), SSRF (user-supplied URLs hitting internal services), and template injection.
Data Exposure — Assess MCP resources for secrets/PII leakage, tool outputs for excessive data, error messages for internal paths/stack traces, and logging for sensitive data capture.
Scope & Sandboxing — Check file system restrictions, network scope (can it reach cloud metadata 169.254.169.254?), process permissions, resource limits, and dependency surface.
Supply Chain — Verify source trustworthiness, run SCA on dependencies, check for lockfiles and reproducible builds, assess update mechanism.
Client Configuration — Review MCP client config for absolute/specific server paths, minimized env var passthrough, and command injection safety in args.

Output

Server overview, tool risk matrix, findings using templates/finding.md, and specific configuration recommendations.

OWASP References

LLM01: Prompt Injection (via tool descriptions and outputs)
LLM02: Insecure Output Handling
LLM06: Excessive Agency (overpermissioned tools)
A01: Broken Access Control
A03: Injection

mcp-server-review

MCP Server Security Review

Steps

Output

OWASP References

More from this repository

More from this repository

MCP Server Security Review

Steps

Output

OWASP References