pact-trust-sdk 0.5.0

PACT — Protocol for Agent Credentials and Trust

PACT Python SDK

Trust infrastructure for autonomous AI agents. Implements the PACT Protocol (Protocol for Agent Credentials and Trust) -- DIDs, mandates, attestations, pacts, and handshakes for machine-to-machine identity and delegation.

Installation

pip install pact-trust-sdk

Optional extras:

pip install pact-trust-sdk[server]   # HTTP server (starlette + uvicorn)
pip install pact-trust-sdk[mcp]      # MCP tool integration

Quick Start

from pact import Agent, Mandate, Attestation

# Create an agent identity
agent = Agent.create(name="Wren")
print(agent.did)  # did:pact:z6Mk...

# Issue a delegation mandate
mandate = Mandate.issue(
    issuer=principal.did,
    subject=agent.did,
    scope=["trade:read", "trade:execute"],
    expires_in_days=90,
)

# Create a trust attestation
attestation = agent.attest(
    subject=peer.did,
    interaction_type="task_completion",
    outcome="success",
    metrics={"accuracy": 0.95},
)

Features

The SDK implements all five PACT primitives:

• Agents -- Ed25519 key pairs with did:pact: decentralized identifiers
• Mandates -- Scoped, time-bound delegation from principal to agent
• Attestations -- Signed records of interaction outcomes that build trust
• Pacts -- Bilateral agreements between agents with lifecycle tracking
• Handshakes -- Cryptographic mutual authentication between agents

Plus: DID resolution, delegation chain validation, and trust evaluation.

Links

• Documentation
• Specification
• Repository
• Security & Audit Trail

License

Apache 2.0