sdk-python

APOA Python SDK

Python SDK for the Agentic Power of Attorney (APOA) standard -- authorization infrastructure for AI agents.

Install

pip install apoa

Quick Start

from apoa import (
    APOADefinition, Agent, BrowserSessionConfig, Principal,
    Rule, ServiceAuthorization, SigningOptions,
    create_client, generate_key_pair,
)

# Generate keys and create a client
private_key, public_key = generate_key_pair()
client = create_client(default_private_key=private_key)

# Create a signed authorization token
token = client.create_token(APOADefinition(
    principal=Principal(id="did:apoa:you"),
    agent=Agent(id="did:apoa:your-agent", name="HomeBot Pro"),
    services=[ServiceAuthorization(
        service="nationwidemortgage.com",
        scopes=["rate_lock:read", "documents:read"],
        constraints={"signing": False},
        access_mode="browser",
        browser_config=BrowserSessionConfig(
            allowed_urls=["https://portal.nationwidemortgage.com/*"],
            credential_vault_ref="1password://vault/mortgage-portal",
        ),
    )],
    rules=[Rule(id="no-signing", description="Never sign anything", enforcement="hard")],
    expires="2026-09-01",
))

# Authorize actions
result = client.authorize(token, "nationwidemortgage.com", "rate_lock:read")
print(result.authorized)  # True

result = client.authorize(token, "nationwidemortgage.com", "documents:sign")
print(result.authorized)  # False

Features

• Token lifecycle: create, sign (Ed25519/ES256), validate, parse
• Scope matching: hierarchical pattern matching (appointments:* matches appointments:read)
• Constraint enforcement: boolean denial at the SDK level, rich constraints at the protocol level
• Authorization: revocation + scope + constraints + hard/soft rules in one call
• Delegation chains: parent-to-child with cryptographically enforced attenuation
• Cascade revocation: revoke parent, kill all children instantly
• Audit trail: append-only action log per token
• Cross-SDK compatibility: tokens created by the TypeScript SDK validate in Python and vice versa

Cross-SDK Compatibility

Tokens are JWTs. A token signed by @apoa/core (TypeScript) validates in apoa (Python) and vice versa. The serialization layer handles camelCase (JWT payload) to snake_case (Python) mapping automatically.

API

Two usage styles:

# Style 1: Client instance (recommended)
client = create_client(default_private_key=key)
client.authorize(token, "service.com", "action:read")

# Style 2: Standalone imports
from apoa import authorize, check_scope
check_scope(token, "service.com", "action:read")

See the full spec and TypeScript SDK for more.

License

Apache 2.0