10 Best Free MCP Servers for Claude Desktop in 2026

Claude Desktop's MCP support turns it from a chatbot into something much closer to an operating system for AI. Instead of copying and pasting data into the chat window, you can give Claude direct access to your files, databases, APIs, and development tools — all through MCP servers that run locally on your machine.

The best part: the most useful servers are completely free. No API keys, no subscriptions, no usage limits. They are open-source packages you install and configure in a few minutes.

We tested dozens of free MCP servers with Claude Desktop and narrowed the list to the ten that actually deliver value in day-to-day use. Each entry includes what the server does, how to install it, and where it falls short.

How to Add MCP Servers to Claude Desktop

Before we get to the list, here is the quick version of the setup process. Claude Desktop reads its MCP configuration from a JSON file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json

Open that file (create it if it does not exist) and add server entries to the mcpServers object. After saving, restart Claude Desktop. For detailed setup instructions, see our step-by-step MCP setup guide — the configuration format is the same across clients.

1. Filesystem Server

What it does: Gives Claude read and write access to specific directories on your machine. Claude can list files, read contents, create new files, move things around, and search for files by name or content.

Install:

{
  "filesystem": {
    "command": "npx",
    "args": [
      "-y",
      "@modelcontextprotocol/server-filesystem",
      "/Users/you/Documents",
      "/Users/you/Projects"
    ]
  }
}

Pros:

• Essential for any workflow that involves local files
• Sandboxed to specific directories — Claude cannot access anything you do not explicitly allow
• Maintained by the official MCP team, so it stays current with protocol changes

Cons:

• No binary file handling — images, PDFs, and other binary formats are not supported
• Large directory listings can be slow
• No file watching or real-time change detection

Verdict: This is the first server everyone should install. Without filesystem access, Claude Desktop is limited to what you paste into the chat.

2. Fetch Server

What it does: Lets Claude make HTTP requests to fetch web content. It retrieves web pages and converts them to markdown for easy consumption, and can also make raw HTTP requests to APIs.

Install:

{
  "fetch": {
    "command": "npx",
    "args": ["-y", "@modelcontextprotocol/server-fetch"]
  }
}

Pros:

• No API key required
• Converts HTML to clean markdown automatically
• Handles redirects, content negotiation, and basic error cases
• Works with any public URL

Cons:

• No JavaScript rendering — dynamic SPAs return empty or incomplete content
• No anti-bot evasion — will fail on Cloudflare-protected sites
• Rate limiting is your responsibility

Verdict: Perfect for grabbing documentation, blog posts, API references, and other static content. For JavaScript-heavy sites, you will need something like Playwright MCP or Firecrawl instead.

3. Memory Server

What it does: Provides Claude with persistent memory that survives between conversations. Claude can store and retrieve key-value pairs, building up a knowledge base over time. Data is stored as a local JSON file.

Install:

{
  "memory": {
    "command": "npx",
    "args": ["-y", "@modelcontextprotocol/server-memory"]
  }
}

Pros:

• Gives Claude persistent context across conversations
• Simple key-value storage that is easy to understand and debug
• Data stays local — nothing is sent to external services
• Useful for storing project preferences, frequently-used configurations, and personal notes

Cons:

• No semantic search — retrieval is exact-match only
• The JSON file can grow large if you store a lot of data
• No organization or categorization beyond flat key-value pairs

Verdict: Surprisingly useful once you start using it. Tell Claude to remember your coding preferences, project details, or frequently needed information, and it will recall them in future conversations.

4. GitHub Server

What it does: Full GitHub integration — create and manage issues, read and review pull requests, search repositories, manage branches, and work with files directly in your repos.

Install:

{
  "github": {
    "command": "npx",
    "args": ["-y", "@modelcontextprotocol/server-github"],
    "env": {
      "GITHUB_PERSONAL_ACCESS_TOKEN": "ghp_your_token"
    }
  }
}

Pros:

• Comprehensive GitHub API coverage
• Claude can create issues, review PRs, and search code without leaving the chat
• Works with both public and private repositories
• Free to use (the server is free; GitHub itself has free tiers)

Cons:

• Requires a personal access token with appropriate scopes
• Token management is on you — if the token leaks, your repos are exposed
• Large repository operations (searching across many repos) can be slow

Verdict: Essential for developers. Being able to say "create an issue for that bug we just discussed" or "show me the open PRs in my project" without switching to the browser is a genuine productivity improvement.

5. SQLite Server

What it does: Connects Claude to a local SQLite database. Claude can run queries, inspect schema, create tables, and analyze data directly.

Install:

{
  "sqlite": {
    "command": "npx",
    "args": ["-y", "@modelcontextprotocol/server-sqlite", "/path/to/your/database.db"]
  }
}

Pros:

• No external database server required — SQLite is a file-based database
• Great for data analysis, prototyping, and working with local datasets
• Claude can write SQL queries, analyze results, and suggest schema improvements
• Read and write access configurable

Cons:

• SQLite-only — does not work with Postgres, MySQL, or other databases
• No connection pooling or concurrent access management
• Large databases can be slow to query through MCP

Verdict: Excellent for data analysis workflows. Drop a CSV into SQLite, point this server at it, and let Claude run queries and generate insights. For production databases, use the dedicated Postgres server instead.

6. Brave Search Server

What it does: Gives Claude the ability to search the web using the Brave Search API. Returns search results with titles, URLs, and snippets.

Install:

{
  "brave-search": {
    "command": "npx",
    "args": ["-y", "@modelcontextprotocol/server-brave-search"],
    "env": {
      "BRAVE_API_KEY": "your-brave-api-key"
    }
  }
}

Pros:

• Real web search results — not hallucinated URLs
• Brave's free API tier provides 2,000 queries per month
• Privacy-focused search engine with no tracking
• Returns both web results and local results

Cons:

• Requires a free API key from Brave (quick signup)
• Free tier has rate limits — not suitable for high-volume automated searching
• Search result quality can vary compared to Google

Verdict: The free tier is generous enough for personal use. Having Claude search the web for current information — library versions, error messages, documentation — eliminates a lot of tab-switching.

7. Puppeteer Server

What it does: Launches a headless Chromium browser that Claude can control — navigate to URLs, click elements, fill forms, take screenshots, and extract content from JavaScript-rendered pages.

Install:

{
  "puppeteer": {
    "command": "npx",
    "args": ["-y", "@modelcontextprotocol/server-puppeteer"]
  }
}

Pros:

• Full JavaScript rendering — works with SPAs and dynamic content
• Screenshot capability is useful for visual debugging and documentation
• No API key or subscription needed
• Handles pages that the fetch server cannot

Cons:

• Resource-intensive — runs a full Chromium process
• Slower than simple HTTP fetching
• No built-in anti-bot evasion
• Console output can be noisy

Verdict: The free alternative to managed scraping services. Use the fetch server for simple pages and switch to Puppeteer when you need JavaScript rendering or page interaction.

8. Git Server

What it does: Provides Git operations — clone repositories, view diffs, check logs, create branches, stage changes, and commit. Works with any local Git repository.

Install:

{
  "git": {
    "command": "npx",
    "args": ["-y", "@modelcontextprotocol/server-git"]
  }
}

Pros:

• Full Git workflow without leaving the chat
• Claude can review diffs, explain commit history, and help with merge conflicts
• Works with any local repository, regardless of remote host
• No API keys needed — uses your local Git configuration

Cons:

• Push/pull operations use your existing Git credentials, which could be a security consideration
• Large repositories with extensive history can be slow to process
• No GitHub/GitLab-specific features (issues, PRs) — use the dedicated servers for those

Verdict: Complements the GitHub server well. Use the Git server for local repository operations and the GitHub server for platform-specific features.

9. Slack Server

What it does: Connects Claude to your Slack workspace. Read channels, search messages, post messages, and manage conversations.

Install:

{
  "slack": {
    "command": "npx",
    "args": ["-y", "@modelcontextprotocol/server-slack"],
    "env": {
      "SLACK_BOT_TOKEN": "xoxb-your-token",
      "SLACK_TEAM_ID": "T0123456789"
    }
  }
}

Pros:

• Search across your Slack workspace from the chat
• Claude can summarize channel discussions and find specific messages
• Post messages to channels directly from Claude Desktop
• Free to use (requires a Slack app with appropriate permissions)

Cons:

• Requires creating a Slack app and getting a bot token — setup takes 10-15 minutes
• Message posting should be used carefully to avoid spam
• Only accesses channels the bot has been invited to

Verdict: Particularly valuable for catching up on channels you have missed. Ask Claude to summarize what happened in a channel while you were away.

10. Sequential Thinking Server

What it does: Provides a structured thinking tool that helps Claude work through complex problems step by step. It does not connect to external services — instead, it gives Claude a framework for deliberate, multi-step reasoning.

Install:

{
  "sequential-thinking": {
    "command": "npx",
    "args": ["-y", "@modelcontextprotocol/server-sequential-thinking"]
  }
}

Pros:

• Improves Claude's reasoning on complex problems
• No external dependencies or API keys
• Lightweight — minimal resource usage
• Visible reasoning chain helps you follow Claude's logic

Cons:

• Benefits are subtle and hard to measure objectively
• Adds verbosity to responses as Claude shows its thinking steps
• Not useful for simple, straightforward tasks

Verdict: This one is unusual because it is not about connecting to external data — it is about improving how Claude thinks. Worth trying for complex analysis, debugging, or planning tasks.

Recommended Starting Configuration

If you want a practical, no-cost setup that covers the most common use cases, start with these five:

{
  "mcpServers": {
    "filesystem": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-filesystem", "/Users/you/Documents"]
    },
    "fetch": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-fetch"]
    },
    "memory": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-memory"]
    },
    "git": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-git"]
    },
    "sequential-thinking": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-sequential-thinking"]
    }
  }
}

This combination gives Claude file access, web content retrieval, persistent memory, Git integration, and improved reasoning — all without spending a dollar. Add the GitHub, Brave Search, and Slack servers when you need their specific capabilities.

For more MCP servers beyond the free tier, check out our review of the best web scraping MCP servers or browse the full AgentSource directory to discover tools organized by category.