strands-agents-session 0.1.3

Backend-agnostic session management for Strands Agents — a SessionStorage interface + KeyValueSessionManager to build session backends (DynamoDB, Redis, MongoDB, …)

strands-agents-session

Backend-agnostic session management for Strands Agents. Provides the shared machinery so you can build a session storage backend (DynamoDB, Redis, MongoDB, Postgres, …) by implementing just a handful of methods.

This is the base package of a family. Concrete backends are shipped separately, e.g. strands-session-dynamodb.

What it gives you

• KeyValueSessionManager — implements the full Strands SessionRepository (all 8 CRUD methods) and mixes in RepositorySessionManager, so the Strands session lifecycle (message indexing, restore, removed_message_count offsetting, tool-use repair, change detection) is reused unchanged.
• SessionStorage — a tiny ordered keyed-record interface (put / get / query / delete / delete_partition). Implement it and you have a working Strands session backend.
• InMemorySessionStorage — a ready in-memory backend for tests and local development.
• keys — shared key/serialization conventions (zero-padded message sort keys so list_messages(offset, limit) is a native ordered range scan).

Storage only, by design. Message pruning in Strands is a ConversationManager concern, deliberately decoupled from storage. This package (and its backends) never prune — doing so at the storage layer would corrupt Strands' message-index/offset restore logic.

Installation

pip install strands-agents-session

Requires Python 3.10+.

Using the in-memory backend

from strands import Agent
from strands_agents_session import KeyValueSessionManager, InMemorySessionStorage

session_manager = KeyValueSessionManager(
    session_id="user-123",
    storage=InMemorySessionStorage(),
)
agent = Agent(session_manager=session_manager)

Building a backend

Implement SessionStorage and hand it to KeyValueSessionManager:

from strands_agents_session import KeyValueSessionManager, SessionStorage

class MyStorage(SessionStorage):
    def put(self, item): ...                 # item = {"pk", "sk", "data"}
    def get(self, pk, sk): ...               # -> item | None
    def query(self, pk, sk_gte=None, limit=None): ...  # ordered by sk asc
    def delete(self, pk, sk): ...
    def delete_partition(self, pk): ...

class MySessionManager(KeyValueSessionManager):
    def __init__(self, session_id, **cfg):
        super().__init__(session_id=session_id, storage=MyStorage(**cfg))

That's it — all the SessionRepository methods, restore logic, and pagination come from the base.

License

MIT