context-mcp

MCP server for context management, temporal metadata, and lightweight retrieval plumbing.

This crate provides a "memory service" for agents: store/retrieve context items with timestamps and metadata, supporting basic query/retrieval patterns via text matching and filtering.

Features

Multi-tier Storage: In-memory LRU cache with optional sled-based disk persistence
Temporal Tracking: Timestamps, age tracking, and time-based filtering for context relevance
CPU-Optimized Retrieval: Parallel processing with rayon for text-based context queries
MCP Protocol Support: JSON-RPC server implementation with HTTP/WebSocket and stdio transports
Screening Status Fields: Built-in fields for tracking security screening state (integration not included)

Status

Alpha / under active development. APIs and tool names may change.

Installation

Add this to your Cargo.toml:

[dependencies]
context-mcp = "0.1"

Usage

As a Library

use context_mcp::{ContextStore, StorageConfig, Context, ContextDomain};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Create storage configuration
    let config = StorageConfig {
        memory_cache_size: 1000,
        enable_persistence: true,
    };

    // Create context store
    let store = ContextStore::new(config)?;

    // Store some context
    let ctx = Context::new("This is some important information", ContextDomain::Code);
    let id = store.store(ctx).await?;

    // Retrieve it
    let retrieved = store.get(&id).await?;
    println!("Retrieved: {}", retrieved.content);

    Ok(())
}

As an MCP Server

Run as HTTP server:

context-mcp --host 127.0.0.1 --port 3000

Run as stdio transport:

context-mcp --stdio

What It Does (Verified by Code/Tests)

JSON-RPC MCP Server: Runs over HTTP/WebSocket or stdio transport
Context Storage: Store/retrieve contexts with IDs, domains, timestamps, tags, and custom metadata
Tiered Storage: In-memory LRU cache (always) + optional sled disk persistence
Text-Based Queries: Query by text content, domain, tags, time ranges with simple text matching
Temporal Filtering: Filter contexts by creation time, last access, age, and expiration
Parallel Processing: CPU-optimized retrieval using rayon for performance
MCP Tools: 10 tools including store_context, get_context, query_contexts, retrieve_contexts, delete_context, update_screening, get_temporal_stats, get_storage_stats, cleanup_expired

What It Does Not Do (Yet)

Vector embeddings: Mock implementation only - no real embedding generation or similarity search
Semantic search: Text matching is literal, not semantic
External integrations: No active security-mcp or other service integrations (only status fields)
Chunking/citations: No automatic document chunking or citation tracking
Distributed storage: Single-node only, no replication or clustering

Architecture

┌─────────────────┐    ┌──────────────────┐    ┌─────────────────┐
│   MCP Client    │    │  JSON-RPC Server │    │ Storage Layer   │
│                 │    │                  │    │                 │
│ • HTTP/WS       │◄──►│ • Store/Retrieve │◄──►│ • In-Memory LRU │
│ • stdio         │    │ • Query/Filter   │    │ • Sled (opt)    │
│ • curl/tools    │    │ • Temporal Stats │    │ • Domain Index  │
└─────────────────┘    └──────────────────┘    └─────────────────┘
                              │
                              ▼
                       ┌──────────────┐
                       │ RAG Processor│
                       │ • Text Match │
                       │ • Parallel   │
                       │ • Scoring    │
                       └──────────────┘

Contributing

See CONTRIBUTING.md for development setup and contribution guidelines.

License

Licensed under the MIT License. See LICENSE for details.

context-mcp 0.1.4