alter-sdk 0.2.1

Alter Vault Python SDK - OAuth token management with policy enforcement

Alter SDK for Python

Official Python SDK for Alter Vault - OAuth token management with policy enforcement.

Features

• Zero Token Exposure: Tokens are never exposed to developers - injected automatically
• Single Entry Point: One method (vault.request()) for all provider APIs
• Type-Safe Enums: Provider and HttpMethod enums with autocomplete
• URL Templating: Path parameter substitution with automatic URL encoding
• Automatic Audit Logging: All API calls logged as fire-and-forget background tasks
• Real-time Policy Enforcement: Every token request checked against current policies
• Automatic Token Refresh: Tokens refreshed transparently by the backend
• Actor Tracking: First-class support for AI agent and MCP server observability

Installation

pip install alter-sdk

Quick Start

import asyncio
from alter_sdk import AlterVault, Provider, HttpMethod

async def main():
    vault = AlterVault(api_key="alter_key_...")

    # Make API request - token injected automatically, never exposed
    response = await vault.request(
        Provider.GOOGLE,
        HttpMethod.GET,
        "https://www.googleapis.com/calendar/v3/calendars/primary/events",
        user={"user_id": "alice"},
        query_params={"maxResults": "10"},
    )
    events = response.json()
    print(events)

    await vault.close()

asyncio.run(main())

Usage

Simple GET Request

response = await vault.request(
    Provider.GOOGLE,
    HttpMethod.GET,
    "https://www.googleapis.com/calendar/v3/calendars/primary/events",
    user={"user_id": "alice"},
)

POST with JSON Body

response = await vault.request(
    Provider.SALESFORCE,
    HttpMethod.POST,
    "https://api.example.com/v1/items",
    user={"user_id": "alice"},
    json={"name": "New Item", "price": 99.99},
    reason="Creating new item",
)

URL Path Templating

response = await vault.request(
    Provider.SALESFORCE,
    HttpMethod.PUT,
    "https://api.example.com/v1/items/{item_id}",
    user={"user_id": "alice"},
    path_params={"item_id": "123"},
    json={"price": 89.99},
)

Query Parameters and Extra Headers

response = await vault.request(
    "notion",
    HttpMethod.POST,
    "https://api.notion.com/v1/databases/{db_id}/query",
    user={"user_id": "alice"},
    path_params={"db_id": "abc123"},
    extra_headers={"Notion-Version": "2022-06-28"},
    json={"page_size": 10},
)

Context Manager

async with AlterVault(api_key="alter_key_...") as vault:
    response = await vault.request(
        Provider.GOOGLE,
        HttpMethod.GET,
        "https://www.googleapis.com/calendar/v3/calendars/primary/events",
        user={"user_id": "alice"},
    )
# Automatically closed

Note: After close() is called, subsequent request() calls raise AlterSDKError. close() is idempotent — calling it multiple times is safe.

AI Agent Actor Tracking

vault = AlterVault(
    api_key="alter_key_...",
    actor_type="ai_agent",
    actor_identifier="email-assistant-v2",
    actor_name="Email Assistant",
    actor_version="2.0.0",
    framework="langgraph",
)

response = await vault.request(
    Provider.GOOGLE,
    HttpMethod.GET,
    "https://www.googleapis.com/calendar/v3/calendars/primary/events",
    user={"user_id": "alice"},
    run_id="550e8400-e29b-41d4-a716-446655440000",
    thread_id="thread-xyz",
    tool_call_id="call_abc_123",
)

Multi-Agent Deployments

Each agent must create its own AlterVault instance with a unique actor identity. Do not share a single instance across agents.

# Each agent gets its own vault instance
email_agent = AlterVault(
    api_key="alter_key_...",
    actor_type="ai_agent",
    actor_identifier="email-assistant-v2",
    actor_name="Email Assistant",
)

calendar_agent = AlterVault(
    api_key="alter_key_...",
    actor_type="ai_agent",
    actor_identifier="calendar-agent-v1",
    actor_name="Calendar Agent",
)

# Audit logs and policies are tracked per agent
user = {"user_id": "alice"}
await email_agent.request(
    Provider.GOOGLE, HttpMethod.GET,
    "https://gmail.googleapis.com/gmail/v1/users/me/messages",
    user=user,
)
await calendar_agent.request(
    Provider.GOOGLE, HttpMethod.GET,
    "https://www.googleapis.com/calendar/v3/calendars/primary/events",
    user=user,
)

# Clean up each instance
await email_agent.close()
await calendar_agent.close()

Configuration

vault = AlterVault(
    api_key="alter_key_...",              # Required: Alter Vault API key
    base_url="https://api.alter.com",     # Optional: Custom API URL
    timeout=30.0,                         # Optional: HTTP timeout in seconds
    # Actor tracking (optional)
    actor_type="ai_agent",               # "ai_agent" or "mcp_server"
    actor_identifier="my-agent",         # Unique identifier
    actor_name="My Agent",               # Human-readable name
    actor_version="1.0.0",               # Version string
    framework="langgraph",               # AI framework
    client_type="cursor",                # MCP client type
)

Error Handling

from alter_sdk import AlterVault, Provider, HttpMethod
from alter_sdk.exceptions import (
    AlterSDKError,              # Base exception for all SDK errors (including validation: api_key, actor_type, URL scheme, path_params)
    PolicyViolationError,       # Policy denied access (403)
    ConnectionNotFoundError,    # No OAuth connection found (404)
    TokenExpiredError,          # Token refresh failed (400/502)
    TokenRetrievalError,        # Other backend errors
    NetworkError,               # Backend or provider unreachable
    TimeoutError,               # Request timed out (subclass of NetworkError)
    ProviderAPIError,           # Provider API returned error (4xx/5xx)
)

try:
    response = await vault.request(
        Provider.GOOGLE,
        HttpMethod.GET,
        "https://www.googleapis.com/calendar/v3/calendars/primary/events",
        user={"user_id": "alice"},
    )
except PolicyViolationError as e:
    print(f"Policy denied: {e.message}")
    print(f"Policy error: {e.policy_error}")  # Detailed policy failure reason
except ConnectionNotFoundError:
    print("No OAuth connection - user needs to authenticate")
except TokenExpiredError as e:
    print(f"Token expired for connection: {e.connection_id}")
except TimeoutError as e:
    print(f"Request timed out — safe to retry: {e.message}")
except NetworkError as e:
    print(f"Network issue: {e.message}")
except ProviderAPIError as e:
    print(f"Provider error {e.status_code}: {e.response_body}")

Supported Providers

from alter_sdk import Provider

Provider.GOOGLE       # "google"
Provider.GITHUB       # "github"
Provider.SLACK        # "slack"
Provider.MICROSOFT    # "microsoft"
Provider.SALESFORCE   # "salesforce"
Provider.SENTRY       # "sentry"

# Strings also work for any provider
await vault.request("notion", HttpMethod.GET, url, user=user)

Requirements

• Python 3.11+
• httpx[http2]
• pydantic

License

MIT License