apoa 0.3.2

Python SDK for the Agentic Power of Attorney (APOA) standard

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 (
    APOA,
    BrowserSessionConfig,
    generate_key_pair,
)

private_key, public_key = generate_key_pair()
apoa = APOA(private_key=private_key)

token = apoa.tokens.create_grant(
    principal="did:apoa:you",
    agent="did:apoa:your-agent",
    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",
    ),
    expires_in="30d",
)

valid = apoa.tokens.validate(token.raw, public_key=public_key)
print(valid.valid)  # True

result = apoa.authorizations.check(token, "nationwidemortgage.com", "rate_lock:read")
print(result.authorized)  # True

result = apoa.authorizations.check(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

Three usage styles:

# Style 1: Application facade (recommended for apps)
apoa = APOA(private_key=key)
token = apoa.tokens.create_grant(
    principal="did:apoa:you",
    agent="did:apoa:agent",
    service="service.com",
    scopes=["action:read"],
    expires_in="30d",
)
apoa.authorizations.check(token, "service.com", "action:read")

# Style 2: Protocol client
client = create_client(default_private_key=key)
client.authorize(token, "service.com", "action:read")

# Style 3: 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