LangChain Tools + MemorySync

Overview

One factory call returns five structured tools — add_memory, search_memory, list_memories, update_memory, delete_memory — with identical names and behaviour in Python and Node.js. Tools return readable strings and never raise, so a memory failure cannot abort an agent run, and writes are idempotent so a repeating agent cannot create duplicates.

Setup status and requirements

Supported version

langchain-memorysync 1.1.0 (PyPI) / memorysync-langchain 1.1.0 (npm)

Last setup review

2026-08-22

Permissions

A MemorySync API key with read and write scopes; delete_memory needs delete permission.

Limits

Requires langchain-core 0.3 or newer (Python 3.10+, Node 18+). Memory text is immutable — update changes tags and importance, and replacing a fact is delete plus add.

Capabilities

• Five tools from one factory call: add, search, list, update, delete
• Tools never raise — failures come back as readable strings
• Content-derived idempotency: repeated saves are recognised, not duplicated
• Per-end-user scoping — a delete cannot reach another user’s memory
• read_only mode returning only search and list
• Works with create_agent, LangGraph agents, and the legacy AgentExecutor

Quick Start

from langchain.agents import create_agent
from langchain_memorysync import create_memorysync_tools

tools = create_memorysync_tools(end_user_id="customer-7")
agent = create_agent(model, tools=tools)

Use Cases

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