@membank/core
FrameworkFreeCore library for membank — handles storage, embeddings, deduplication, and semantic search.
Capabilities9 decomposed
vector-based semantic search with deduplication
Medium confidenceImplements semantic search by converting text inputs into embeddings and querying a vector store to find semantically similar content. The system includes built-in deduplication logic that identifies and filters duplicate or near-duplicate entries before storage, reducing redundant vectors in the index and improving search precision. Uses configurable embedding providers and supports similarity-based ranking to surface the most relevant results.
Integrates deduplication directly into the search pipeline rather than as a post-processing step, preventing duplicate vectors from being stored in the first place. Uses configurable embedding providers with a unified interface, allowing swapping providers without changing application code.
Lighter-weight than Pinecone or Weaviate for simple use cases because it handles embeddings and deduplication in-process without requiring a separate managed service, though with lower scalability for massive datasets.
pluggable embedding provider abstraction
Medium confidenceProvides a provider-agnostic interface for embedding generation that abstracts away the specifics of different embedding APIs (OpenAI, Anthropic, local models, etc.). Developers configure a provider once and the system handles API calls, token counting, batching, and error handling transparently. The abstraction allows swapping providers without modifying application code, enabling cost optimization or model switching.
Uses a provider plugin pattern where each embedding service (OpenAI, Anthropic, etc.) implements a common interface, allowing runtime provider swapping without recompilation. Abstracts token counting and batch size limits per provider to prevent API errors.
More flexible than hardcoding a single embedding service because it decouples application logic from provider specifics, whereas LangChain's embedding abstraction requires more boilerplate configuration.
in-memory and persistent storage abstraction
Medium confidenceProvides a unified storage interface that supports both in-memory and persistent backends (file-based, database, etc.) for storing embeddings and metadata. The abstraction allows applications to start with in-memory storage for development and switch to persistent storage for production without code changes. Handles serialization, deserialization, and basic CRUD operations across different storage backends.
Separates storage interface from implementation, allowing in-memory and persistent backends to be swapped at configuration time. Uses a common CRUD interface across all backends, reducing cognitive load for developers managing multiple storage strategies.
Simpler than managing separate in-memory caches and persistent databases because a single abstraction handles both, whereas typical applications require glue code to sync between layers.
metadata-enriched memory indexing
Medium confidenceIndexes memories with associated metadata (timestamps, source, tags, custom attributes) alongside embeddings, enabling filtering and contextual retrieval beyond pure semantic similarity. The system stores metadata in a queryable format and allows filtering search results by metadata predicates (e.g., 'memories from the last 24 hours' or 'memories tagged as critical'). Metadata is preserved through storage and retrieval cycles.
Stores metadata alongside embeddings in the same index rather than as a separate layer, enabling efficient combined semantic + metadata queries. Metadata is treated as first-class data, not an afterthought, allowing rich filtering without separate lookups.
More integrated than adding metadata as a post-retrieval filter because it pushes filtering into the index, reducing the number of candidates to rank and improving query performance.
batch embedding and indexing with error recovery
Medium confidenceProcesses multiple texts in batches for embedding generation and indexing, with built-in error handling and retry logic for failed embeddings. The system groups texts into provider-appropriate batch sizes, handles partial failures gracefully, and allows resuming failed batches without re-processing successful entries. Provides progress tracking and detailed error reporting for debugging batch operations.
Integrates error recovery directly into the batch pipeline rather than requiring external orchestration, tracking which items succeeded and failed to enable resumable operations. Uses provider-specific batch size optimization to maximize throughput while respecting API limits.
More fault-tolerant than naive batch loops because it tracks state and allows resuming from failures, whereas simple loops lose progress on any error.
memory context window management for llm integration
Medium confidenceManages the selection and ordering of retrieved memories to fit within an LLM's context window constraints. The system ranks retrieved memories by relevance, truncates or summarizes to stay within token limits, and provides formatted context strings ready for injection into LLM prompts. Supports configurable context window sizes and prioritization strategies (e.g., recency vs. relevance).
Treats context window management as a first-class concern in the memory system rather than delegating it to application code, providing built-in token budgeting and memory selection strategies. Formats memories for direct LLM consumption without additional processing.
More integrated than manually selecting and formatting memories in application code because it automates token budgeting and prioritization, reducing boilerplate in LLM agent loops.
similarity-based memory deduplication with configurable thresholds
Medium confidenceDetects and removes semantically similar memories using embedding similarity scores and configurable thresholds, preventing redundant information from accumulating in the memory store. The system compares new memories against existing ones using cosine similarity or other distance metrics, and either rejects duplicates or merges them based on configuration. Deduplication runs automatically on insertion or can be triggered manually on existing memory stores.
Performs deduplication at insertion time using embedding similarity rather than exact matching, catching semantic duplicates that keyword-based deduplication would miss. Threshold configuration allows tuning sensitivity without code changes.
More effective than hash-based deduplication because it catches semantically similar memories even with different wording, whereas exact matching only catches identical text.
memory expiration and lifecycle management
Medium confidenceAutomatically manages memory lifecycle by tracking creation/access timestamps and removing or archiving memories based on configurable expiration policies. The system supports time-based expiration (e.g., delete memories older than 30 days), access-based expiration (e.g., delete unused memories), and custom lifecycle hooks. Expired memories can be archived rather than deleted for audit trails or later recovery.
Treats memory expiration as a configurable policy rather than manual cleanup, enabling automatic lifecycle management without application intervention. Supports archival as a first-class operation, preserving expired memories for compliance.
More automated than manual memory cleanup because policies run automatically, whereas typical applications require explicit deletion logic scattered throughout the codebase.
typescript-first type-safe memory api
Medium confidenceProvides a fully typed TypeScript API with generics for memory objects, metadata, and query results, enabling compile-time type checking and IDE autocomplete for memory operations. The system uses TypeScript generics to allow applications to define custom memory schemas and metadata types, with full type safety throughout the API. Type definitions are exported for use in application code, reducing runtime errors.
Uses TypeScript generics throughout the API to provide compile-time type safety for custom memory schemas, whereas most memory systems use untyped or loosely-typed APIs. Type definitions are first-class exports, enabling type sharing across applications.
More type-safe than JavaScript-based memory systems because the entire API is typed with generics, catching schema mismatches at compile time rather than runtime.
Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.
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Best For
- ✓developers building LLM agents with memory systems
- ✓teams implementing RAG pipelines with deduplication requirements
- ✓applications needing semantic retrieval without managing separate vector databases
- ✓teams wanting to avoid embedding provider lock-in
- ✓developers prototyping with multiple embedding models
- ✓applications needing cost-optimized embedding strategies
- ✓developers prototyping memory systems and wanting to defer persistence decisions
- ✓teams migrating from in-memory to persistent storage
Known Limitations
- ⚠Deduplication strategy and similarity thresholds are not configurable in the public API — uses fixed defaults
- ⚠No built-in support for hybrid search combining semantic and keyword matching
- ⚠Embedding quality depends entirely on the configured embedding provider; no local fallback
- ⚠No built-in provider auto-selection or fallback logic — requires explicit configuration
- ⚠Batching behavior and optimization strategies vary by provider; no unified batching API
- ⚠Local embedding models require separate setup and are not bundled
Requirements
Input / Output
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Core library for membank — handles storage, embeddings, deduplication, and semantic search.
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