"Guide to Using LangChain Correctly" matching MCP servers:

An MCP server that sends plain-text Gmail messages only to a predefined allowlist, using generated recipient IDs instead of email addresses to enforce security.

A secure MCP proxy server with JWT authentication, SQL guardrails, rate limiting, and Kafka audit logging, enabling enterprise-grade access control for MCP clients like Cursor and Claude Desktop.

Provides tools to interact with the OpenCTI platform, including checking if a campaign exists.

Enables administrators to securely record approved parking reservations to a durable text file with validation, concurrency safety, and audit logging.

Policy-based governance for AI agent tool calls. YAML policies, approval gates, risk assessment, and audit logging across LangChain, OpenAI, Anthropic, and MCP.

MCP server for creating and managing SOPS-encrypted secret files using age encryption, enabling AI agents to generate and manage secrets without ever seeing plaintext values.

Email validation MCP server using MailboxValidator API to determine validity of an email address.

An MCP server that exposes governance, trust-scoring, compliance, guardrail, cost, drift, and supply-chain scanning tools and resources to any MCP client over stdio, Streamable HTTP, or legacy HTTP+SSE. It lets agents route every tool call through a deterministic five-way decision (allow, redact, require approval, deny, or quarantine) with hash-chained evidence, human approval workflows, and in-agent trust gates for LangChain, LangGraph, and Google ADK.

AI agent identity, permissions, trust scores, and tamper-evident audit trails. 17 MCP tools: register agents (Ed25519 keypairs), check permissions (sub-5ms), emit audit events, verify trust scores (0-100), delegate credentials, ephemeral agents. IETF Internet-Draft filed. Works with LangChain, OpenAI, CrewAI, Stripe ACP. npx @vorim/mcp-server

Governance runtime for AI agents: a guard tool evaluates risky actions against policy before they execute (block / warn / require human approval), approvals route to a human queue, and every action becomes a replayable decision record with per-action spend tracking. Runs over stdio via npx @dashclaw/mcp-server; works with Claude Code, Codex, LangChain, CrewAI, or any MCP host.

Provides security assessment methodology, tool documentation, and step-by-step workflows to guide AI agents through vulnerability scanning, static analysis, and penetration testing of applications and URLs.

This server enables interaction with SailPoint IdentityIQ through SCIM API endpoints, allowing MCP clients like Claude Desktop to manage identity resources using natural language.

Enables authenticated user profile retrieval via the 'whoami' tool, using OAuth2 and Asgardeo.

Enables AI agents to scan projects for secrets, manage incidents, and create honeytokens using GitGuardian's API.

Creates and manages encoded messages using zero-width characters and advanced Unicode steganography techniques, enabling quantum-themed puzzle generation with hidden secrets.

Demonstrates how to secure an MCP server with OAuth 2.1 using AWS Cognito, with support for dynamic client registration and client ID metadata documents.

A sovereign, MIT-licensed MCP server that provides cryptographically signed notarization for listings, benchmarks, and transactions using Ed25519. It runs offline on user infrastructure as a free alternative to SaaS notary tools.

Enables agents to check third-party tool licenses, validate vendor policies, and issue license receipts before using external tools.

Enables offline, deterministic verification that one immutable artifact followed a declared build-to-production promotion chain, using only hash-based evidence and failing closed on incomplete or nonconformant gate records.

Enables users to define and run MCP tools using declarative YAML configs with built-in trust enforcement, credential brokering, and tamper-evident audit logging.