Crate lc_memory 

Memory system for conversation history management.

Provides conversation memory management functionality.

Core Concepts

• BaseMemory: Base trait for memory.
• ConversationBufferMemory: Simple conversation buffer.
• ConversationBufferWindowMemory: Conversation buffer with window.
• ConversationSummaryMemory: LLM-based summary compression.
• ConversationSummaryBufferMemory: Hybrid compression (summary + recent messages).
• PersistentMemory: Trait for persistent memory storage.
• ContextWindow: Fits messages within a token budget.

Feature Flags

• mongodb-persistence — Enables MongoPersistentMemory (MongoDB-backed persistent memory).
• vectorstore-memory — Enables VectorStoreRetrieverMemory (vector-store-backed memory).

Re-exports

pub use base::memory_variables_to_messages;

pub use base::BaseChatMemory;

pub use base::BaseMemory;

pub use base::ChatMessageHistory;

pub use base::MemoryError;

pub use buffer::ConversationBufferMemory;

pub use context_window::ContextWindow;

pub use context_window::Strategy;

pub use persistent::MemoryData;

pub use persistent::PersistenceConfig;

pub use persistent::PersistentMemory;

pub use summary::ConversationSummaryMemory;

pub use summary_buffer::ConversationSummaryBufferMemory;

pub use window::ConversationBufferWindowMemory;

pub use with_history::RunnableWithMessageHistory;

pub use with_history::SharedMemory;

Modules

base

Memory base trait

buffer

Conversation Buffer Memory

context_window

Context Window for long context management.

persistent

Memory Persistence Trait

summary

Conversation Summary Memory

summary_buffer

Conversation Summary Buffer Memory

window

Conversation Buffer Window Memory

with_history

LCEL-composable “LLM wrapper with memory”.