MCP Servers

Best MCP Servers and Tool Integration Options

MCP servers expose tools and context through a shared protocol so agents can connect to local apps, SaaS systems, and private data.

Search intent

Understand when MCP is better than custom tool glue and what to evaluate before exposing tools to agents.

Last reviewed

June 23, 2026

Tools considered

5

Open source options

5

Definition

An MCP server is a boundary around capabilities: it describes tools, resources, and prompts in a way MCP clients can discover and call.

Use cases

  • Connecting coding agents to repositories and issue trackers
  • Giving desktop agents controlled access to local files
  • Standardizing SaaS tool access across multiple agent clients

Selection criteria

  • Does the server enforce auth and permission boundaries?
  • Are tool schemas narrow, typed, and auditable?
  • Can the server be observed and rate limited in production?

Selection advice

Use MCP when you need reusable tool access across clients; use direct function calling when one app owns both the agent and the tool surface.

Tool comparison snapshot

ToolBest forOpen sourceMain tradeoffOpen
Model Context Protocoltool interoperabilityYessingle-app tool calls with no reuse needOpen
OpenAI Agents SDKOpenAI-first teamsYesteams requiring model-neutral orchestration from day oneOpen
LangGraphstateful workflowsYessimple one-shot assistantsOpen

Recommended tools

Open protocol for connecting agents to tools and context.

Model Context Protocol

Model Context Protocol logo

Best when multiple agent clients should discover and call the same tool surface without bespoke integrations.

Open

A lightweight SDK for agents, tools, handoffs, and traces.

OpenAI Agents SDK

OpenAI Agents SDK logo

Best when the team already standardizes on OpenAI models and wants the shortest path from prototype to observable agent workflow.

Open

Stateful graph orchestration for controllable agents.

LangGraph

LangGraph logo

Best when agent behavior must be represented as explicit nodes, edges, state, and recovery paths.

Open

Connect agents to 1000+ SaaS tools with managed auth and tool registry.

Composio

Composio logo

Best when agents need to act on real SaaS tools (GitHub, Salesforce, Notion) and the team wants managed OAuth, rate limiting, and tool discovery.

Open

MCP runtime with authorization, permission, and production-grade tool execution.

Arcade.dev

Arcade.dev logo

Best when you have adopted MCP as a protocol and need a runtime layer that handles auth, permissions, and audit before agent tool calls hit production.

Open

Related guides

What Is an MCP Server?

An MCP server exposes tools and context to agents through a common protocol boundary.

Related comparisons

MCP vs Function Calling (2026): Tool Calling Compared

Use function calling for one product and one agent runtime. Use MCP when tool access should be shared, discoverable, and governed across clients.

Alternative pages

Composio Alternatives and Competitors

Compare Composio alternatives and competitors including Arcade.dev, self-hosted MCP servers, and custom tool registries. Evaluate auth, MCP support, pricing, and self-hosting before you switch.