Invariance SDK

Installation

What is Invariance?

Every action an AI agent takes — tool calls, decisions, inter-agent messages — gets recorded as a hash-chained, cryptographically-signed receipt. This creates a tamper-evident audit trail that can be independently verified.

• Receipt-based audit trail — every action produces a signed, hash-chained receipt
• Policy enforcement — spending caps, rate limits, allowlists, custom predicates
• Bilateral A2A proof — both sender and receiver sign every message exchange
• Observability — trace events, anomaly detection, replay, counterfactual analysis
• Settlement — cryptographic contracts between agents with delivery proof

Protocol-agnostic TypeScript SDK. Wraps MCP, A2A, CrewAI, LangChain, AutoGen, raw HTTP.

Core SDK

The foundation: initialization, sessions, recording, agents, policies, and identity.

Advanced

Observability, tracing, and query capabilities.

Evaluation & Testing

Automated testing, scoring, datasets, and experiment tracking.

Monitoring

Real-time monitoring, drift detection, training feedback, and prompt management.

Integrations

Connect Invariance to existing agent frameworks and protocols.

For AI Agents

The complete Invariance API is available as structured JSON for programmatic consumption. This endpoint is public, unauthenticated, and cached for 1 hour.

curl https://api.useinvariance.com/v1/docs

const docs = await fetch('https://api.useinvariance.com/v1/docs').then(r => r.json());

// Browse endpoints
console.log(docs.endpoints.length + ' endpoints available');

// Browse SDK methods
console.log(docs.sdkMethods.length + ' SDK methods available');