alter-sdk 0.3.1

Alter Vault Python SDK - OAuth token management with policy enforcement

Alter SDK for Python

Official Python SDK for Alter Vault - Credential management for agents 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 with request metadata (HTTP method and URL) for full audit trail
• Real-time Policy Enforcement: Every token request checked against current policies
• Automatic Token Refresh: Tokens refreshed transparently by the backend
• API Key and Custom Credential Support: Handles OAuth tokens, API keys, and custom credential formats automatically
• HMAC Request Signing: All SDK-to-backend requests are signed with a derived HMAC-SHA256 key for integrity, authenticity, and replay protection
• 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, ActorType, Provider, HttpMethod

async def main():
    vault = AlterVault(
        api_key="alter_key_...",
        actor_type=ActorType.AI_AGENT,
        actor_identifier="my-agent",
    )

    # Make API request — token injected automatically, never exposed
    response = await vault.request(
        "CONNECTION_ID",  # from Alter Connect (see below)
        HttpMethod.GET,
        "https://www.googleapis.com/calendar/v3/calendars/primary/events",
        query_params={"maxResults": "10"},
    )
    events = response.json()
    print(events)

    await vault.close()

asyncio.run(main())

Where does connection_id come from?

OAuth connections:

1. User completes OAuth via Alter Connect (frontend widget)
2. The onSuccess callback returns a connection_id (UUID)
3. You save it in your database, mapped to your user
4. You pass it to vault.request() when making API calls

Managed secrets (API keys, service tokens):

1. Store credentials in the Developer Portal under Managed Secrets
2. Copy the connection_id returned
3. Use the same vault.request() — credentials are injected automatically

# You can also discover connection_ids programmatically:
result = await vault.list_connections(provider_id="google")
for conn in result.connections:
    print(f"{conn.id}: {conn.account_display_name}")

Usage

The request() method returns the raw httpx.Response. The token is injected automatically and never exposed.

Simple GET Request

response = await vault.request(
    connection_id,
    HttpMethod.GET,
    "https://www.googleapis.com/calendar/v3/calendars/primary/events",
)

POST with JSON Body

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

URL Path Templating

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

Query Parameters and Extra Headers

response = await vault.request(
    connection_id,
    HttpMethod.POST,
    "https://api.notion.com/v1/databases/{db_id}/query",
    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_...",
    actor_type=ActorType.BACKEND_SERVICE,
    actor_identifier="my-service",
) as vault:
    response = await vault.request(
        connection_id,
        HttpMethod.GET,
        "https://www.googleapis.com/calendar/v3/calendars/primary/events",
    )
# Automatically closed

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

Using Managed Secrets

For your own APIs with API keys or service tokens (no OAuth flow needed):

async with AlterVault(
    api_key="alter_key_...",
    actor_type=ActorType.BACKEND_SERVICE,
    actor_identifier="my-service",
) as vault:
    response = await vault.request(
        "MANAGED_SECRET_CONNECTION_ID",  # from Developer Portal
        HttpMethod.GET,
        "https://api.internal.com/v1/data",
    )

The credential is injected automatically as the configured header type (Bearer, API Key, Basic Auth).

Connection Management

List Connections

Retrieve OAuth connections for your app, optionally filtered by provider:

from alter_sdk import AlterVault, ActorType

async with AlterVault(
    api_key="alter_key_...",
    actor_type=ActorType.BACKEND_SERVICE,
    actor_identifier="my-service",
) as vault:
    # List all connections
    result = await vault.list_connections()
    for conn in result.connections:
        print(f"{conn.provider_id}: {conn.account_display_name} ({conn.status})")

    # Filter by provider with pagination
    result = await vault.list_connections(provider_id="google", limit=10, offset=0)
    print(f"Total: {result.total}, Has more: {result.has_more}")

Parameter	Type	Default	Description
provider_id	str | None	None	Filter by provider (e.g., "google")
limit	int	100	Max connections to return
offset	int	0	Pagination offset

Returns ConnectionListResult with: connections (list[ConnectionInfo]), total, limit, offset, has_more.

Create Connect Session

Generate a session URL for end-users to authenticate with OAuth providers:

session = await vault.create_connect_session(
    end_user={"id": "alice"},
    allowed_providers=["google", "github"],
    return_url="https://myapp.com/callback",
)
print(f"Connect URL: {session.connect_url}")
print(f"Expires in: {session.expires_in}s")

Parameter	Type	Default	Description
end_user	dict	required	Must contain "id" key
allowed_providers	list[str] | None	None	Restrict to specific providers
return_url	str | None	None	Redirect URL after OAuth flow

Returns ConnectSession with: session_token, connect_url, expires_in, expires_at.

AI Agent Actor Tracking

from alter_sdk import AlterVault, ActorType, Provider, HttpMethod

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

response = await vault.request(
    connection_id,
    HttpMethod.GET,
    "https://www.googleapis.com/calendar/v3/calendars/primary/events",
    run_id="550e8400-e29b-41d4-a716-446655440000",  # auto-generated UUID if omitted
    thread_id="thread-xyz",
    tool_call_id="call_abc_123",
)

Note: run_id is auto-generated as a UUID v4 if not provided. All sub-actions within a single request() call share the same run_id for audit log grouping.

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=ActorType.AI_AGENT,
    actor_identifier="email-assistant-v2",
    actor_name="Email Assistant",
)

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

# Audit logs and policies are tracked per agent
await email_agent.request(
    gmail_connection_id,  # from Alter Connect
    HttpMethod.GET,
    "https://gmail.googleapis.com/gmail/v1/users/me/messages",
)
await calendar_agent.request(
    calendar_connection_id,  # from Alter Connect
    HttpMethod.GET,
    "https://www.googleapis.com/calendar/v3/calendars/primary/events",
)

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

Configuration

from alter_sdk import AlterVault, ActorType

vault = AlterVault(
    api_key="alter_key_...",              # Required: Alter Vault API key
    actor_type=ActorType.AI_AGENT,        # Required: ActorType enum
    actor_identifier="my-agent",          # Required: Unique identifier
    timeout=30.0,                         # Optional: HTTP timeout in seconds
    actor_name="My Agent",               # Optional: Human-readable name
    actor_version="1.0.0",               # Optional: Version string
    framework="langgraph",               # Optional: AI framework
    client_type="cursor",                # Optional: 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, actor_identifier, 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(
        connection_id,
        HttpMethod.GET,
        "https://www.googleapis.com/calendar/v3/calendars/primary/events",
    )
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.SENTRY       # "sentry"

# Provider enums are used for filtering (e.g., list_connections(provider_id=Provider.GOOGLE))
# request() takes a connection_id string as its first argument
await vault.request(connection_id, HttpMethod.GET, url)

Requirements

• Python 3.11+
• httpx[http2]
• pydantic

License

MIT License