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SentinelAgent Guard
Firewall for MCP servers and AI agents blocking malicious tool calls
$39/moStarting price
About SentinelAgent Guard
SentinelAgent Guard is a protocol-native firewall designed to protect MCP servers and AI agents from malicious tool calls. It intercepts every request before it reaches the MCP server, performing 22 deterministic checks across five security layers. These checks verify request formatting, tool fingerprints, argument schemas, and response content, blocking any call that fails validation. The tool operates without using AI models in the detection path, ensuring consistent and cost-free decisions per call. Guard is positioned between the agent and the MCP server, replacing the need for manual approval after the initial setup. It is particularly useful for environments where MCP servers handle sensitive operations such as file access, database queries, cloud API interactions, and payment processing. The system maintains a versioned rubric to ensure consistent security grading across its scanner, CLI, and runtime components.
Key features
- 22 deterministic security checks per request
- Tool fingerprinting and schema validation
- Response content scanning on return path
- Custom detection rules (Pro and above)
- Audit retention from 7 to 365 days depending on plan
- SIEM and OpenTelemetry export (Team and Enterprise)
- Approvals queue for manual review (Team and Enterprise)
- Air-gapped licensing (Enterprise)
Use cases
- Protecting AI agents from tool poisoning and hidden payloads
- Securing MCP servers handling sensitive file or database operations
- Ensuring compliance with audit trails for security reviews
Pros
- Protocol-native MCP security with no AI model in the detection path
- 22 deterministic checks across five layers per request
- Versioned rubric ensures consistent security grading
- Self-serve pricing with a free tier for one server
- Supports air-gapped licensing and compliance features
Cons
- No SOC 2 certification listed
- Limited to MCP server environments
- Enterprise plan required for advanced compliance features
Frequently asked questions about SentinelAgent Guard
What does SentinelAgent Guard do?
SentinelAgent Guard is a protocol-native firewall that protects MCP servers and AI agents from malicious tool calls by intercepting every request before it reaches the MCP server and performing 22 deterministic checks across five security layers.
Who is SentinelAgent Guard designed for?
It is designed for environments where MCP servers handle sensitive operations such as file access, database queries, cloud API interactions, and payment processing, particularly where security cannot rely solely on manual approval.
How does SentinelAgent Guard work?
Guard operates between the agent and the MCP server, replacing the need for manual approval after initial setup. It verifies request formatting, tool fingerprints, argument schemas, and response content without using AI models in the detection path.
Does SentinelAgent Guard use AI models for detection?
No, Guard does not use AI models in the detection path, ensuring consistent and cost-free decisions per call while maintaining high security standards.
What types of attacks does SentinelAgent Guard prevent?
Guard prevents attacks such as tool poisoning, hidden instructions in tool definitions, and unauthorized data access by validating tool integrity and request content before execution.
How do I get started with SentinelAgent Guard?
To get started, point your agent at Guard instead of directly at your MCP server. The tool offers a free tier with no payment required for initial setup, and detailed documentation is available for integration.
