Best LangGraph MCP Servers
LangGraph is a library for building stateful, multi-actor applications with LLMs. It extends LangChain with a flexible graph system to coordinate agent workflows.
Why this server?
Enables LangGraph agents to submit review requests and receive human decisions via the Gatewerk Python SDK.
AlicenseAqualityAmaintenanceThe open-source review layer for AI agents. Work done for humans is decided by humans.18361AGPL 3.0Why this server?
Integrates with LangGraph for stateful agent workflows with conservation-law governance, fleet telemetry, and compute budget enforcement.
AlicenseAqualityBmaintenanceEnables Claude Code to query and control the SuperInstance fleet, including fleet status, conservation law checks, semantic search, and agent registry.814MITWhy this server?
Offers a LangGraph checkpoint saver that persists agent state and memories with AES-256-GCM encrypted storage via the synapse-layer-langgraph integration.

synapse-layerofficial
AlicenseBqualityBmaintenanceMCP-native persistent memory for AI agents. Stores and retrieves encrypted memories with Trust Quotient scoring, cross-agent handover protocol, and immutable audit trail. 13 tools. Remote endpoint available.1313Apache 2.0Why this server?
Provides a callback handler integration to trace LangGraph workflows for observability.

spanlens-mcpofficial
AlicenseAqualityCmaintenanceMCP-native LLM observability. Query your Spanlens traces, stats, cost anomalies, and savings from Cursor, Claude Desktop, or any MCP client. Open source (MIT).712MITWhy this server?
Allows LangGraph agents to interact with KumoRFM for executing predictive queries, evaluating models, and managing graph metadata.

KumoRFM MCP Serverofficial
AlicenseAqualityDmaintenanceEnables AI assistants to query KumoRFM for predictive analytics on relational data, including graph management, natural language to PQL conversion, and training-free predictions.1234MITWhy this server?
Provides a drop-in CCSStore adapter for LangGraph that adds read-side coherence and stale-write prevention via MESI protocol.
AlicenseAqualityAmaintenanceCoherence guard for shared files: when two agents write the same file, the stale writer is denied instead of silently overwriting, then reacquires and retries. Single-host, TLA+-verified.612Apache 2.0Why this server?
Integrates with LangGraph, allowing LangGraph agents to retrieve options market data including gamma curves, GEX by strike, and trade setups.
AlicenseAqualityCmaintenanceEnables AI agents to discover and retrieve options market-structure data (GEX, gamma flip levels, dealer positioning, skew, max pain, expected-move levels, options flow, and ranked trade setups) from Trading Volatility's public API via natural language.171MITWhy this server?
Integrates with LangGraph agents to provide trust-scored MCP server discovery and invocation, enabling multi-agent systems to securely access external tools.
AlicenseAqualityDmaintenanceMCP server exposing AgentForge Trust Score audit tools. Query trust, evaluate policies, list trusted servers, recommend with filter.4201MITWhy this server?
Fetches official documentation for LangGraph from the web, providing access to agent creation guides and API references.
AlicenseAqualityDmaintenanceEnables managing internal documentation with search and add capabilities, and fetching official documentation from 13+ popular libraries via MCP tools.69MIT