Enterprise-Grade Security for AI Agents

Secure Your AI Agents at Scale

The most advanced security gateway for Model Context Protocol. Detect threats, protect PII, and maintain complete visibility over your AI infrastructure.

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120+
Threat Patterns
20
Secret Types Detected
6
Policy Actions
99.9%
Uptime SLA
Postern.AI Dashboard

AI Agents Are Powerful.
But They're Also a Security Risk.

As organizations adopt AI agents that interact with tools and data via MCP, new attack vectors emerge that traditional security tools can't detect.

Rug Pull Attacks

MCP tool descriptions silently modified after approval to inject hidden malicious instructions into agent workflows.

Secret & PII Leaks

API keys, tokens, SSNs, and credentials can leak through both requests and responses without bidirectional scanning.

Tool Poisoning & Shadowing

Compromised MCP tools can contain hidden instructions, shadow legitimate tools, or change descriptions after approval.

Complete Security for Your MCP Infrastructure

Postern.AI provides defense-in-depth protection with multiple layers of security designed specifically for AI agent workflows.

Bidirectional Scanning

Both requests and responses are scanned for threats, secrets, PII, and injected instructions. Auto-masks sensitive data before it reaches the client.

Request + Response Auto-Masking

Tool Safety Scanner

Pre-scan tool descriptions and parameter schemas for poisoning. Detect tool shadowing across servers and rug pull attacks via hash tracking.

Shadowing Rug Pull Pre-Scan

Secret & Credential Detection

20 patterns detect leaked API keys, tokens, and webhooks: AWS, GitHub, Slack, Azure, Stripe, OpenAI, MS Teams, and more.

20 Patterns Auto-Redact

Policy Engine

Flexible policy rules with 13 condition operators and 6 action types including rate limiting and response masking.

Priority-Based Conditional

Session Correlation

4-layer correlation engine tracks requests across sessions with semantic data flow analysis.

Causal Links Risk Scoring

Audit & Compliance

Complete audit trail with scheduled compliance reports. SOC 2 and GDPR ready out of the box.

Full Logging Auto Reports

How Postern.AI Protects Your AI Agents

Deploy as a transparent proxy between your AI clients and MCP servers. No code changes required.

1

AI Client Request

Claude, GPT, or any MCP-compatible client sends a tool request

2

Postern.AI Inspection

Request is analyzed for threats, secrets, PII, and policy violations in real-time

3

Secure Forwarding

Clean requests are forwarded to MCP server, threats are blocked

4

Response Protection

Responses are scanned for secrets, PII, and injected instructions, then auto-masked before reaching the client

Postern.AI Architecture

Defense in Depth for AI Security

Postern.AI employs multiple security layers that work together to provide comprehensive protection against known and emerging threats.

Prompt Injection Detection

9 specialized patterns detect jailbreaks, instruction overrides, and role manipulation attempts.

Tool Poisoning Prevention

23 patterns detect hidden instructions, secrecy directives, and covert execution commands in tool descriptions and parameter schemas.

Secret & Credential Detection

20 patterns detect leaked API keys and tokens from AWS, GitHub, Slack, Azure, Stripe, OpenAI, MS Teams, and more.

Shadowing & Rug Pull Detection

Detects tool name conflicts across servers and tracks description changes via SHA-256 hashing to catch post-approval modifications.

Semantic Correlation

Tracks data flow across requests to detect exfiltration attempts and causal attack chains.

Threat Detection Dashboard

10 Threat Types Detected

Comprehensive coverage against the full spectrum of AI agent security threats.

Prompt Injection
Tool Poisoning
Data Exfiltration
PII Leak
Anomaly
Rate Limit
Policy Violation
Unauthorized Access
Malicious Payload
Injection Attack

Powerful Dashboard & Analytics

Get complete visibility into your AI agent security posture with real-time dashboards and detailed analytics.

Policy Management

Policy Management

Create and manage security policies with flexible rules and conditions.

Session Tracking

Session Correlation

Track request chains and identify attack patterns across sessions.

Data Protection

Data Protection

Monitor sensitive data flows and enforce PII masking across all MCP tools.

Audit Log

Audit & Compliance

Complete audit trail for compliance with automated reporting.

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Frequently Asked Questions

What is MCP and why does it need security?
Model Context Protocol (MCP) is an open standard for AI agents to interact with external tools and data sources. MCP introduces new attack surfaces such as tool poisoning, rug pull attacks, and data exfiltration through tool responses. Postern.AI sits between AI clients and MCP servers to detect and prevent these threats.
How does Postern.AI integrate with existing MCP setups?
Postern.AI deploys as a transparent proxy between your AI clients and MCP servers. Simply point your MCP clients to Postern.AI instead of directly to your MCP servers. No code changes required on either the client or server side.
What MCP-specific threats does Postern.AI detect?
Postern.AI detects tool poisoning (malicious instructions hidden in tool descriptions and parameter schemas), rug pull attacks (tool descriptions silently modified after approval, tracked via SHA-256 hashing), tool shadowing (same tool name registered across different servers), secret and credential leaks (API keys, tokens, and webhooks from 20+ platforms), PII leakage through tool responses, data exfiltration attempts, and unauthorized tool access. Both requests and responses are scanned bidirectionally with 120+ specialized detection patterns.
Does Postern.AI support policy-based access control?
Yes. You can define granular policies based on agent identity, tool name, MCP server, time of day, and request parameters. Policies support multiple actions including allow, deny, require approval, rate limiting, and response masking.
How can I get early access?
Sign up for early access above with your work email. We're onboarding teams in batches and prioritizing organizations actively using MCP in production. You'll get access to the full platform including all security features, dashboard, and API.