lilith-zero 0.2.0

Lilith MCP Middleware SDK

Lilith Python SDK

The official Python client for the Lilith Security Middleware.

Installation

pip install lilith-zero

Note: This package requires the Lilith binary core. The SDK will attempt to find it automatically or guide you to install it.

Usage

Zero-Config Connection

Lilith automatically discovers the binary on your PATH or in standard locations.

from lilith_zero import Lilith
from lilith_zero.exceptions import PolicyViolationError

client = Lilith(
    upstream="python my_tool_server.py", # The command to run your tools
    policy="policy.yaml"                 # Security rules
)

async with client:
    try:
        tools = await client.list_tools()
        result = await client.call_tool("read_file", {"path": "secret.txt"})
    except PolicyViolationError as e:
        print(f"Security Alert: {e}")

Manual Binary Path

If you need to point to a specific build (e.g. during development):

client = Lilith(
    upstream="...",
    binary="/path/to/custom/Lilith" 
)

Exceptions

• PolicyViolationError: Raised when the Policy Engine determines a request is unsafe (Static Rule, Taint Check, or Resource Access).
• LilithConnectionError: Raised if the middleware process cannot start or crashes.
• LilithConfigError: Raised if the binary is missing or arguments are invalid.

License

Apache-2.0