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⚸ Lilith Zero - Security Middleware for MCP tool calls written in Rust.

23 starsRust

Lilith-zero update: fast Rust security for agents

by gregojaca·Apr 23, 2026·2 points·0 comments
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AI Analysis

●●●BangerSolve My ProblemWizardry

Transport-layer security for MCP agents stops exfiltration unlike prompt-based guardrails.

Strengths
  • •Transport-layer interposition means zero code changes to existing agent implementations.
  • •Fail-closed architecture defaults to deny, preventing accidental policy gaps.
  • •Tamper-proof HMAC-signed audit logs provide non-repudiation for compliance requirements.
Weaknesses
  • •Version 0.2.0 suggests early stage, likely missing enterprise SSO integrations.
  • •MCP-specific focus limits utility for non-MCP agent frameworks currently.
Category
Security
Target Audience

Backend developers building LLM agents

Similar To

Guardrails AI · Lakera Guard · Open Policy Agent

Post Description

We added support for claude code, vs code copilot, gh copilot cli and MCP servers You simply connect Lilith to the hooks and define your security policies.

Lilith Zero is a high-performance security runtime designed to mitigate data exfiltration and unauthorized tool invocation in LLM-based agent systems. By interposing at the transport layer, Lilith Zero enforces security invariants through deterministic policy evaluation and strictly framed execution. Lilith Zero is OS, framework, and language agnostic, providing uniform security primitives across diverse implementation environments.

If you want to try it out, happy to help to get started :)

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