moss-google

MOSS signing integration for Google GenAI SDK (Gemini). Unsigned output is broken output.

Installation

pip install moss-google

Quick Start

Sign function calls, responses, and content from Gemini:

import google.generativeai as genai
from moss_google import sign_function_call, sign_response, sign_content

genai.configure(api_key="...")
model = genai.GenerativeModel("gemini-pro")

# Get a response with function calling
response = model.generate_content(
    "What's the weather in NYC?",
    tools=[get_weather_tool]
)

# Sign the full response
result = sign_response(response, agent_id="weather-bot")
print(f"Signed: {result.signature[:20]}...")

# Sign individual function calls
for part in response.candidates[0].content.parts:
    if hasattr(part, "function_call"):
        result = sign_function_call(part.function_call, agent_id="weather-bot")

Enterprise Mode

Set MOSS_API_KEY for automatic policy evaluation:

import os
os.environ["MOSS_API_KEY"] = "your-api-key"

from moss_google import sign_function_call, enterprise_enabled

print(f"Enterprise: {enterprise_enabled()}")  # True

result = sign_function_call(
    function_call,
    agent_id="finance-bot",
    context={"user_id": "u123"}
)

if result.blocked:
    print(f"Blocked by policy: {result.policy.reason}")

Verification

from moss_google import verify_envelope

verify_result = verify_envelope(result.envelope)
if verify_result.valid:
    print(f"Signed by: {verify_result.subject}")

All Functions

Function	Description
sign_function_call()	Sign a function call
sign_function_call_async()	Async version
sign_response()	Sign a GenerateContentResponse
sign_response_async()	Async version
sign_content()	Sign a Content object
sign_content_async()	Async version
sign_part()	Sign a Part (text or function call)
sign_part_async()	Async version
verify_envelope()	Verify a signed envelope

Enterprise Features

Feature	Free	Enterprise
Local signing	✓	✓
Offline verification	✓	✓
Policy evaluation	-	✓
Evidence retention	-	✓
Audit exports	-	✓

Links

• moss-sdk - Core MOSS SDK
• mosscomputing.com - Project site

License

This package is licensed under the Business Source License 1.1.

• Free for evaluation, testing, and development
• Free for non-production use
• Production use requires a MOSS subscription
• Converts to Apache 2.0 on January 25, 2030