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 decay::ForgetConfig;

pub use decay::ForgettingMemory;

pub use file_memory::FileMemoryError;

pub use file_memory::FileMemoryStore;

pub use file_memory::MemoryEntry;

pub use persistent::MemoryData;

pub use persistent::PersistenceConfig;

pub use persistent::PersistentMemory;

pub use semantic::DecayWeights;

pub use semantic::LexicalScorer;

pub use semantic::LongTermMemory;

pub use semantic::MemoryExtractor;

pub use semantic::MemoryHit;

pub use semantic::MemoryItem;

pub use semantic::MemoryQuery;

pub use semantic::MemoryStore;

pub use semantic::MemoryTier;

pub use semantic::PromotionPolicy;

pub use semantic::SemanticScorer;

pub use semantic::ShortTermMemory;

pub use semantic::StoredMemory;

pub use semantic::TwoTierMemory;

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.

decay

Memory decay & forgetting (C3, v0.22.1 §S4): TTL + importance-driven consolidation.

file_memory

File-based memory (C1, v0.22.1 §S4): memories are real, inspectable files.

persistent

Memory Persistence Trait

semantic

B4 (v0.22.4): two-tier semantic memory — a unified MemoryStore abstraction (namespaced key-value + semantic recall) with a short-/long-term split and weighted-decay ranking.

summary

Conversation Summary Memory

summary_buffer

Conversation Summary Buffer Memory

window

Conversation Buffer Window Memory

with_history

LCEL-composable “LLM wrapper with memory”.