# MCP Playground > Free browser-based tool for testing MCP (Model Context Protocol) servers and clients. Build AI agents that connect to any MCP server with 60+ models (Claude, GPT-5, Gemini, DeepSeek, Grok, Qwen). Includes a security scanner, prompt library, MCP server registry, agent templates, and 65+ developer guides. MCP Playground (mcpplaygroundonline.com) is the go-to tool for developers building with Model Context Protocol. Test any remote MCP server, run auto-generated evals that prove an AI agent can answer using its tools, build and save reusable AI agents, compare 60+ models side-by-side on the same task, audit servers for security issues, explore the MCP server registry, and read in-depth guides on MCP development, authentication, and agent tooling. ## Free Tools - [MCP Agent Studio](https://mcpplaygroundonline.com/mcp-agent-studio): Browser-based AI agent that connects to any MCP server and chats with 60+ models including Claude Opus 5.5, Claude Sonnet 4.6, GPT-5.4, Gemini 3.1 Pro, DeepSeek V4, Grok 4, Qwen 3, and NVIDIA Nemotron. Compare models side-by-side, save reusable agents, and inspect every tool call live with full JSON input/output. Also runs MCP evals: it reads every tool on a server, writes a test suite from the real schemas, and runs it — direct checks are decided deterministically by code (output-schema conformance, JSON-RPC error codes, pagination, result caps, idempotency) while agentic tasks are driven by one model and graded by another, so you get a pass/fail report per tool with evidence. No code, no installation, free credits on sign-up. - [MCP Agent Templates](https://mcpplaygroundonline.com/templates): Pre-built MCP agent templates for the tools you already use — Notion, GitHub, Jira, Confluence, Sentry, HubSpot, Stripe, Linear, Slack, Supabase, Vercel, Shopify, Cloudflare, Zapier, Amazon Ads, Meta Ads, Salesforce, Asana, Monday.com and more. Pick a template, add your access token, start chatting in seconds. - [MCP Playground Desktop: local and stdio MCP server testing](https://mcpplaygroundonline.com/local-mcp-server-testing): Desktop app for macOS 13+ (Apple Silicon and Intel) and Windows 10/11 that tests MCP servers running on your own machine, which browser-based testers cannot reach: stdio servers started from a command (npx, uv, node, python) with arguments, working directory and environment variables, and Streamable HTTP or SSE servers on localhost with custom headers. Lists and runs tools, resources and prompts, logs every JSON-RPC message plus the server's stderr, imports servers from Claude Desktop, Cursor, VS Code, Windsurf and Claude Code configs, loads the login-shell PATH (avoiding spawn npx ENOENT), and includes Agent Studio for letting AI models call your tools. Signed and notarized on Mac; Microsoft Store on Windows. Free 7-day trial, then included with paid plans. - [MCP Server Tester](https://mcpplaygroundonline.com/mcp-test-server): Connect to any remote MCP server, list its tools, prompts, and resources, and execute them from the browser — no installation required. - [MCP Test Client](https://mcpplaygroundonline.com/mcp-test-client): Free browser-based tool for validating any MCP client implementation against six hosted mock servers — echo (basic connectivity), auth (Bearer-token), error (deliberate error responses), complex (multi-tool schemas), MCP Apps (ui:// resources), and stateless 2026-07-28 (Multi Round-Trip Requests). Tests connection lifecycle, capability negotiation, tool discovery, and error handling. No install, no API key. - [Mock MCP Servers](https://mcpplaygroundonline.com/mock-mcp-servers): Public MCP server URLs anyone can paste into any MCP client, free and without sign-up. https://mcpplaygroundonline.com/mcp-echo-server (echo tool, no auth — temporarily offline), https://mcpplaygroundonline.com/mcp-auth-server (401 + WWW-Authenticate challenge, Bearer token), https://mcpplaygroundonline.com/mcp-error-server (simulates validation, not_found, rate_limit, timeout and five more error types on demand), https://mcpplaygroundonline.com/mcp-complex-server (four deeply-nested tool schemas for tool-selection testing), https://mcpplaygroundonline.com/mcp-app-server (returns a ui:// MCP Apps resource), and https://mcpplaygroundonline.com/mcp-stateless-server (Multi Round-Trip Requests and signed requestState from the 2026-07-28 revision). Every endpoint serves both the stateless 2026-07-28 revision and the 2025-era initialize handshake; append ?rev=2026-07-28 or ?rev=2025-11-25 to pin one and test rejection paths. - [MCP With Different AI Models](https://mcpplaygroundonline.com/mcp-model-comparison): Which AI models work with MCP and how they differ at tool calling. Covers Claude (Anthropic — the only family whose API speaks MCP natively), GPT (OpenAI), Gemini and Gemma (Google), Grok (xAI), DeepSeek, Qwen (Alibaba), GLM (Z.AI), Kimi (Moonshot), MiniMax, Nemotron (NVIDIA) and Mistral. Explains why the same MCP server behaves differently per model — every provider except Anthropic reaches MCP tools through a translation layer — and links a step-by-step guide per model family. - [MCP Security Scanner](https://mcpplaygroundonline.com/mcp-security-scanner): Free tool that runs 27+ checks across transport security, authentication, MCP protocol compliance, injection risks, information disclosure, CORS policy, security headers, and rate limiting. Paste any MCP server URL and get a graded report in seconds. - [OWASP MCP Top 10](https://mcpplaygroundonline.com/owasp-mcp-top-10): The ten MCP-specific security risks, with a dedicated page for each of the six that can be tested from outside a server — tool poisoning (MCP03), insufficient authentication and authorization (MCP07), command injection and execution (MCP05), intent flow subversion / indirect prompt injection (MCP06), token mismanagement and secret exposure (MCP01), and context injection and over-sharing (MCP10). Each page explains the attack mechanic, shows a concrete example, lists the exact scanner checks that detect it, and states plainly what an external scan cannot establish. The remaining four categories are listed but deliberately have no page: MCP08 and MCP09 are self-attested or inventory questions rather than observable server properties, and MCP02/MCP04 have no external detector yet. - [MCP Server Registry](https://mcpplaygroundonline.com/mcp-registry): Searchable directory of MCP servers across categories including databases, dev tools, productivity, cloud services, and more. - [Prompt Library](https://mcpplaygroundonline.com/prompt-library): Curated prompts for working with MCP tools and AI agents. - [Agent Skills](https://mcpplaygroundonline.com/skills): Featured agent skill configurations for common workflows. ## What you can build with MCP Agent Studio - Run an eval suite against your own MCP server and find the tool an agent cannot use before your users do - Chat with your Postgres or Supabase database in plain English — no SQL needed - Triage Sentry errors, find the offending commit, and draft a fix - Run Amazon Ads, Meta Ads, or LinkedIn Ads campaigns from chat - Manage Linear, Jira, or Asana sprints conversationally - Query HubSpot or Salesforce CRM with natural language - Inspect a Shopify store, Stripe billing, or Vercel deployments without leaving the chat - Compare Claude vs GPT-5 vs Gemini on the same MCP task to pick the cheapest model that still wins ## Blog & Guides ### Comparison - [Gemini 4 Argon vs Muse Wonder: Which Runs MCP Tools Better?](https://mcpplaygroundonline.com/blog/gemini-4-argon-vs-muse-wonder-mcp): Google and Meta shipped flagship agent models a day apart. Neither has an MCP-Atlas score yet, both are trained to stop … - [Observability MCP Servers: 3 Compared and What They Automate](https://mcpplaygroundonline.com/blog/observability-mcp-servers): Sentry and Datadog run official remote MCP servers, and Grafana ships an open-source one you run yourself. I compared en… - [Payments MCP Servers: 3 Compared and What They Automate](https://mcpplaygroundonline.com/blog/payments-mcp-servers): Stripe and PayPal run official remote MCP servers, and Lago ships an open-source one for billing you host yourself. I co… - [Project Management MCP Servers: 3 Compared and What They Automate](https://mcpplaygroundonline.com/blog/project-management-mcp-servers): Linear and Atlassian run official remote MCP servers, and Plane ships an open-source one you can self-host. I compared e… - [Hosting MCP Servers: 4 Platforms Compared and What They Automate](https://mcpplaygroundonline.com/blog/hosting-mcp-servers): Vercel, Cloudflare, Railway and Render all ship official remote MCP servers. I compared endpoints, auth, tool counts and… - [Is MCP Dead? What the CLI Backlash Gets Right — and Wrong](https://mcpplaygroundonline.com/blog/is-mcp-dead-cli-debate): A post called "MCP is dead. Long live the CLI" hit the top of Hacker News and the argument still has not settled. Three … - [Agent Skills vs MCP vs Function Calling vs A2A (2026 Guide)](https://mcpplaygroundonline.com/blog/agent-skills-vs-mcp): Agent Skills, MCP, function calling and A2A are four different layers of the same agent stack, not four competing choice… - [SEO MCP Servers: 6 Providers Compared and What They Automate](https://mcpplaygroundonline.com/blog/seo-mcp-servers): Semrush, Ahrefs, DataForSEO, OpenSEO and SE Ranking all ship MCP servers now. I connected each one, priced them out, and… - [Meta Muse Spark 1.2 and Muse Glimmer 30B for MCP: Strengths, Benchmarks and Trade-offs](https://mcpplaygroundonline.com/blog/test-mcp-server-with-meta-muse-models): Meta shipped a teacher and its student: Muse Spark, which tops Scale AI's MCP-Atlas leaderboard at 88.1% with a 1M-token… - [MCP vs A2A: Model Context Protocol vs Agent2Agent (2026 Guide)](https://mcpplaygroundonline.com/blog/mcp-vs-a2a-agent2agent-protocol): MCP and A2A solve different problems. MCP connects an agent to tools and data; A2A lets agents talk to each other. Learn… - [Connect Your MCP Server With DeepSeek V4: Step-by-Step Guide (2026)](https://mcpplaygroundonline.com/blog/testing-mcp-with-deepseek): Connect any MCP server to DeepSeek V4-Pro or V4-Flash in 60 seconds — paste the URL, pick the model, start chatting. Plu… - [Best AI Model for MCP Tool Calling in 2026: Claude, GPT-5.4, Gemini 3.1 Pro, GLM-5.1 & More](https://mcpplaygroundonline.com/blog/best-ai-model-for-mcp-tool-calling): We compared 30+ AI models on real MCP tool calling — including Claude Opus 4.6, GPT-5.4, Gemini 3.1 Pro, GLM-5.1, Grok 4… ### Guide - [Social Media MCP Server: Schedule Posts From Claude With Autoadify](https://mcpplaygroundonline.com/blog/social-media-mcp-server): Autoadify runs a hosted social media MCP server with 13 tools for scheduling posts and managing media across 10 platform… - [Bloomberg Enterprise MCP: What It Means for Finance AI Agents (2026)](https://mcpplaygroundonline.com/blog/bloomberg-enterprise-mcp): Bloomberg just put 100M+ securities behind an MCP server. Here is what Enterprise MCP does, why it matters, and how to t… - [Data Warehouse MCP Servers in 2026: BigQuery, Databricks, Snowflake](https://mcpplaygroundonline.com/blog/data-warehouse-mcp-servers): Data warehouse MCP servers compared — BigQuery, Databricks, Snowflake, Redshift, dbt and Looker. What each one exposes, … - [MCP Agent Use Cases: 8 AI Agents to Build by Role (2026)](https://mcpplaygroundonline.com/blog/mcp-agent-use-cases): MCP agent use cases by role: sales, marketing, social media, support, data and engineering. The MCP servers worth connec… - [n8n MCP Server: Connect n8n to Claude and AI Agents (2026 Guide)](https://mcpplaygroundonline.com/blog/n8n-mcp-server-guide): n8n speaks MCP in both directions: expose a workflow as an MCP server so Claude can call it, or let an n8n AI Agent call… - [MCP Gateway: How to Aggregate and Secure Multiple MCP Servers (2026)](https://mcpplaygroundonline.com/blog/mcp-gateway-guide): Connecting an AI agent to ten MCP servers means ten auth flows, ten logs to chase, and ten ways to get attacked. An MCP … - [Ultimate MCP Testing Resources for Developers in 2026](https://mcpplaygroundonline.com/blog/mcp-testing-resources-developers-2026): A curated, live-tested catalog of the MCP testing resources that actually matter in 2026 — the official Inspector, brows… - [How to Test MCP Servers Effectively: A Step-by-Step Guide](https://mcpplaygroundonline.com/blog/how-to-test-mcp-servers-step-by-step): A practical 7-step process for testing MCP servers in 2026 — from the first Inspector connection to evals in CI. Built a… - [Claude Creative Connectors: Adobe, Blender, Ableton & 6 More (2026 Guide)](https://mcpplaygroundonline.com/blog/claude-creative-connectors-adobe-blender-ableton): On April 28, 2026 Anthropic shipped 9 Claude connectors for creative tools — Adobe (50+ apps), Blender, Ableton, Splice,… - [How to Test Your MCP Server with Kimi K2.6 (2026 Guide)](https://mcpplaygroundonline.com/blog/test-mcp-server-with-kimi-k2-6): Step-by-step guide to testing any MCP server with Moonshot AI Kimi K2.6 — the open-weight 1T-parameter agent model that … - [How to Test Your MCP Server with Z.AI GLM Models (2026 Guide)](https://mcpplaygroundonline.com/blog/test-mcp-server-with-glm-models): Step-by-step guide to testing any MCP server with Z.AI GLM — GLM 5.3, GLM 5.2, and GLM 4.7 Flash — using MCP Agent Studi… - [How to Test Your MCP Server with ChatGPT and the OpenAI MCP Tool (2026 Guide)](https://mcpplaygroundonline.com/blog/test-mcp-server-with-chatgpt-and-openai): Step-by-step guide to testing any MCP server with ChatGPT Developer Mode, the OpenAI Responses API mcp tool, the OpenAI … - [Claude Desktop Alternative: 7 Browser-Based MCP Clients Compared (2026)](https://mcpplaygroundonline.com/blog/claude-desktop-alternative-browser-mcp-clients-2026): Claude Desktop locks you to one model and requires a local install. Here are seven tools that let you connect any MCP se… - [AI for Sales Ops: Run HubSpot, Slack and Linear From One Chat Agent](https://mcpplaygroundonline.com/blog/ai-sales-ops-hubspot-slack-linear-agent): Connect HubSpot, Slack and Linear to a single AI agent and manage your entire sales pipeline from one conversation — no … - [AI for DevOps: GitHub, Cloudflare and Sentry in One Agent](https://mcpplaygroundonline.com/blog/ai-devops-github-cloudflare-sentry-stack): Connect GitHub, Cloudflare and Sentry to one AI agent — inspect commits, check Worker deployments, triage production err… - [AI for Customer Success: Stripe, Slack and Linear in One Agent](https://mcpplaygroundonline.com/blog/ai-customer-success-stripe-slack-linear-setup): A customer success agent that pulls Stripe billing, Slack conversations and Linear tickets into a single chat — see a cu… - [How to Test Your MCP Server with Google Gemini Models (2026 Guide)](https://mcpplaygroundonline.com/blog/test-mcp-server-with-gemini-models): Step-by-step guide to testing any MCP server with Google Gemini — Gemini 3.1 Pro, Gemini 3.1 Flash Lite, Gemini 3 Flash,… - [How to Test Your MCP Server with Alibaba Qwen Models (April 2026 Guide)](https://mcpplaygroundonline.com/blog/test-mcp-server-with-qwen-models): Step-by-step guide to testing any MCP server with Alibaba Qwen — Qwen 3.6 Plus, Qwen3.5 397B, Qwen3 235B, and Qwen3 30B … - [Claude MCP Apps — Full Guide: Interactive UIs Inside AI Conversations (2026)](https://mcpplaygroundonline.com/blog/claude-mcp-apps-full-guide): Everything you need to know about Claude MCP Apps — the January 2026 update that lets AI render dashboards, forms, and c… - [MCP vs REST API — What's Different? Complete Developer Comparison (2026)](https://mcpplaygroundonline.com/blog/mcp-vs-rest-api-whats-different): MCP and REST API solve different problems. Learn the key architectural differences between Model Context Protocol and RE… - [MCP vs Function Calling vs REST APIs: When to Use Each for AI Agents](https://mcpplaygroundonline.com/blog/mcp-vs-function-calling-vs-api-comparison): A practical comparison of MCP, function calling, and REST APIs for AI agent development. Covers architecture differences… - [Postgres MCP vs Supabase MCP: Which Should You Use? (Setup + Comparison)](https://mcpplaygroundonline.com/blog/postgres-mcp-vs-supabase-mcp-setup-comparison): Detailed comparison of PostgreSQL MCP and Supabase MCP servers. Learn the differences in tools, auth, setup, and use cas… - [Awesome MCP Servers List (70+) — Live-Tested Catalog for 2026](https://mcpplaygroundonline.com/blog/awesome-mcp-servers): The awesome MCP servers list you can actually test online. 70+ curated Model Context Protocol servers — AWS, X, Snowflak… - [Remote MCP Servers - Test and Connect to MCP Servers Online](https://mcpplaygroundonline.com/blog/remote-mcp-servers): Learn about remote MCP servers and how to test them online without local installation. Discover public MCP servers you c… - [10 Best MCP Servers for Developers in 2026](https://mcpplaygroundonline.com/blog/best-mcp-servers-2026): Curated list of the most useful MCP servers for developers. Includes GitHub, Supabase, Playwright, Notion, Slack, and mo… ### Development - [Support Both MCP Specs? A Q4 2026 Dual-Protocol Checklist](https://mcpplaygroundonline.com/blog/mcp-dual-protocol-support): Should your MCP server still speak 2025-11-25 alongside the stateless 2026-07-28 spec? Who breaks if you drop it, how to… - [MCP AI Agent Readiness: Will Agents Pick Your Tools? (2026)](https://mcpplaygroundonline.com/blog/mcp-ai-agent-readiness): Your MCP server can pass every test and still fail agents. See how AI readiness checks and routing evals prove agents pi… - [Jev MCP: The Decision Layer Your Agent Loop Is Missing](https://mcpplaygroundonline.com/blog/jev-mcp): TypeSafe shipped Jev, a model that cannot write a sentence and never hallucinates a type. It is useless as an MCP agent … - [MCP Observability: How to Trace Every Tool Call in Production](https://mcpplaygroundonline.com/blog/mcp-observability-opentelemetry): A tool call fails and all you get is "I wasn't able to retrieve that." The 2026-07-28 spec deprecated protocol-level Log… - [MCP Context Bloat: The 67,000 Tokens You Pay Before "Hello"](https://mcpplaygroundonline.com/blog/mcp-context-bloat-tool-search): Seven MCP servers consume 67,300 tokens of tool definitions before the user types anything. That is a third of a 200K co… - [MCP Server Cards: The .well-known File Your Server Is Missing](https://mcpplaygroundonline.com/blog/mcp-server-cards-well-known-discovery): Server Cards let a client, registry or crawler learn what your MCP server is before opening a single connection. SEP-212… - [Fable 5.1 vs GPT-6 Astra: Which Model Runs MCP Better?](https://mcpplaygroundonline.com/blog/fable-5-1-vs-gpt-6-astra-mcp): Anthropic and OpenAI shipped flagship models 48 hours apart, at the identical $10/$50 price. For MCP agents the sticker … - [Unity MCP: 10 Things You Can Do (And The Deprecation Nobody Mentions)](https://mcpplaygroundonline.com/blog/unity-mcp-server-guide): Unity MCP connects Claude Code, Cursor and Codex straight into a running Unity Editor so an agent can build scenes, edit… - [WebMCP in 2026: The API Moved and Most Guides Are Wrong](https://mcpplaygroundonline.com/blog/what-is-webmcp): WebMCP lets a web page hand its own tools to an AI agent in the browser. The API moved from navigator.modelContext to do… - [GLM 5.3 MCP: Tool Calling Tested and One Costly Regression](https://mcpplaygroundonline.com/blog/glm-5-3-mcp-servers): Z.AI shipped GLM 5.3 with a 1M context window and stronger agentic tool calling. I ran it against a live MCP server with… - [I Built a Deterministic MCP Eval Engine, Then Deleted Half of It](https://mcpplaygroundonline.com/blog/mcp-eval-engine-design): Scripted MCP evals looked obviously correct: no model near the verdict, every check machine-decidable. Then I ran them a… - [97% of MCP Tool Descriptions Are Broken — How to Test Yours](https://mcpplaygroundonline.com/blog/mcp-tool-description-quality): A peer-reviewed study of 856 tools across 103 MCP servers found that 97.1% of tool descriptions carry at least one defec… - [MCP Error -32602: Every Error Code Change in the 2026-07-28 Spec](https://mcpplaygroundonline.com/blog/mcp-error-32602): Resource not found moved from -32002 to -32602, and the whole JSON-RPC server-error range got repartitioned. If your ser… - [Build an MCP Server on the 2026-07-28 Spec: The Stateless Guide](https://mcpplaygroundonline.com/blog/build-mcp-server-2026-spec): The 2026-07-28 spec shipped final and MCP is stateless now. If you build a new MCP server on the old handshake, you are … - [Claude Opus 5 + MCP Servers: Strengths, Benchmarks & When to Use It](https://mcpplaygroundonline.com/blog/claude-opus-5-mcp-servers): Claude Opus 5 is built for complex agentic and coding work — the model to reach for on hard MCP tool chains. Its specs, … - [MCP Tasks Extension: Long-Running Jobs Without Blocking Your Agent (2026)](https://mcpplaygroundonline.com/blog/mcp-tasks-extension-long-running-operations): The MCP Tasks extension lets agents kick off a 20-minute job, get a task ID back, and poll for the result later. Here is… - [Migrate Your MCP Server to the 2026-07-28 Spec: What Breaks & How to Fix It](https://mcpplaygroundonline.com/blog/migrate-mcp-server-2026-07-28-stateless): The 2026-07-28 MCP spec is the biggest revision since launch. Sessions are gone, three features are deprecated, and erro… - [GPT-5.6 MCP: Testing Servers With Sol, Terra & Luna (2026)](https://mcpplaygroundonline.com/blog/gpt-5-6-mcp-servers-sol-terra-luna): OpenAI's GPT-5.6 Sol, Terra, and Luna are built for agentic tool calling. Here is how to test MCP servers with each mode… - [Claude Fable 5 + MCP Servers: Building Smarter Agents in 2026](https://mcpplaygroundonline.com/blog/claude-fable-5-mcp-servers): Pair Claude Fable 5 with MCP servers to run reliable multi-tool agents. Setup, model comparison, and practical tips — te… - [MCP Goes Stateless: What the 2026-07-28 Spec Changes](https://mcpplaygroundonline.com/blog/mcp-stateless-2026-release-candidate): MCP 2026-07-28 shipped final on July 28, 2026 — the biggest protocol revision since launch. It drops the session handsha… - [Hosted MCP Server: 7 Real Use Cases Developers Build in 2026](https://mcpplaygroundonline.com/blog/hosted-mcp-server-use-cases): Hosted MCP server use cases — chat with Stripe, Postgres, Jira, GitHub and more in 30 seconds. No Docker, no infra. Depl… - [How to Test an AI Agent with MCP Servers Without Burning Tokens](https://mcpplaygroundonline.com/blog/how-to-test-ai-agent-with-mcp): A five-layer method to test an AI agent with MCP servers — Inspector for schema, MCP Playground for the LLM layers, Prom… - [AI Agent + MCP Explained: What Every Developer Needs to Know in 2026](https://mcpplaygroundonline.com/blog/ai-agent-mcp-explained): An AI agent + MCP setup is an LLM that can reach external tools and data through the Model Context Protocol — three swap… - [Build MCP Apps: Add Interactive UIs to Any MCP Server (2026)](https://mcpplaygroundonline.com/blog/build-mcp-apps-developer-guide): Learn how to build MCP Apps — add interactive dashboards, forms, and charts to MCP servers. Covers the ext-apps SDK, sec… - [What Is an MCP Agent? How AI Models Drive MCP Tools in Real Time](https://mcpplaygroundonline.com/blog/what-is-mcp-agent-tool-calling): An MCP agent is what happens when you give an AI model the ability to call your MCP server's tools — in a loop, reasonin… - [MCP Token Counter: Why Your Tools Are Silently Eating Your Context Window](https://mcpplaygroundonline.com/blog/mcp-token-counter-optimize-context-window): Every MCP tool definition is sent to the model on every single request — even tools that never get used. A server with 5… - [10 Things You Can Do With the GitHub MCP Server](https://mcpplaygroundonline.com/blog/10-things-you-can-do-with-github-mcp-server): GitHub's official MCP server gives your AI assistant direct access to repos, PRs, issues, Actions, security alerts, and … - [10 Things You Can Do With Railway MCP Server (2026 Update)](https://mcpplaygroundonline.com/blog/10-things-you-can-do-with-railway-mcp-server-official): Railway MCP moved. It is now a hosted server at mcp.railway.com that you connect through the Railway CLI or OAuth, not a… - [10 Things You Can Do With Vercel MCP Server](https://mcpplaygroundonline.com/blog/10-things-you-can-do-with-vercel-mcp-official-server): Vercel’s official Model Context Protocol server at mcp.vercel.com: search docs, manage projects and deployments, debug b… - [How Datadog's MCP Server Brings Live Observability to AI Agents](https://mcpplaygroundonline.com/blog/datadog-mcp-server-live-observability-ai-agents): Datadog's remote MCP server (GA March 2026) bridges the gap between AI coding agents and live production observability. … - [How to Add Authentication to Your MCP Server — OAuth 2.1, Bearer Tokens, and What the Spec Actually Requires (2026)](https://mcpplaygroundonline.com/blog/mcp-server-oauth-authentication-guide): Every developer who publishes a remote MCP server eventually hits the same wall: how do I stop anyone on the internet fr… - [Build and Deploy an MCP Server on Cloudflare Workers — Complete Guide (2026)](https://mcpplaygroundonline.com/blog/build-mcp-server-cloudflare-workers-guide): Cloudflare Workers is the fastest path from MCP idea to globally deployed server — zero cold starts, 300+ edge locations… - [MCP Server Not Working? Fix Error -32000, Timeouts, and Connection Failures (2026)](https://mcpplaygroundonline.com/blog/mcp-server-troubleshooting-common-errors-fix): The definitive troubleshooting guide for MCP server errors. Fix error -32000 (connection closed), timeouts, authenticati… - [Model Context Protocol Discovery & Initialization](https://mcpplaygroundonline.com/blog/model-context-protocol-discovery-initialization): Learn how MCP discovery works and why it matters. This guide explains how clients discover tools, what happens during in… - [Wrap Existing APIs as MCP Tools (Simple Guide)](https://mcpplaygroundonline.com/blog/wrap-existing-apis-as-mcp-tools-simple-guide): Learn how to wrap existing REST APIs as MCP tools so AI clients can safely and reliably call them. This guide shows you … - [Build a Custom MCP Server Using Node.js (Simple Guide)](https://mcpplaygroundonline.com/blog/build-custom-mcp-server-using-nodejs-simple-guide): Learn how to build a basic MCP server using Node.js, step by step. This guide shows you how to create a clean, typed API… - [What Is the Model Context Protocol (MCP)? A Developer's Guide](https://mcpplaygroundonline.com/blog/what-is-model-context-protocol): Most LLM apps hit the same wall quickly: they need fresh context and the ability to call real systems, without piles of … ### Security - [Deadbugz: The MCP Supply Chain Attack That Waits 3 Calls (2026)](https://mcpplaygroundonline.com/blog/deadbugz-mcp-supply-chain-attack): Deadbugz shipped an MCP server that behaved for exactly three tool calls, then rewrote its own tool descriptions to hunt… - [MCP Server Vulnerabilities: Why the Worst Ones Aren't AI Bugs (2026)](https://mcpplaygroundonline.com/blog/mcp-server-vulnerabilities-2026): A July 2026 scan of 414 live MCP servers found 91.8% without OAuth and 68 reportable vulnerabilities. August's CVEs in m… - [MCP Enterprise-Managed Authorization: Centralized Access Control Goes Stable (2026)](https://mcpplaygroundonline.com/blog/mcp-enterprise-managed-authorization): MCP Enterprise-Managed Authorization is now stable, letting organizations control MCP server access through their own id… - [The MCP stdio RCE Vulnerability: What OX Security Found & How to Protect Your Servers](https://mcpplaygroundonline.com/blog/mcp-stdio-rce-vulnerability): OX Security disclosed a systemic RCE in the MCP SDK stdio transport affecting 150M+ downloads and 7,000+ servers. Anthro… - [From Shodan to Shell: How Attackers Find and Exploit Exposed MCP Servers — And How to Check Yours](https://mcpplaygroundonline.com/blog/mcp-server-security-complete-guide-2026): A real attacker needs under 3 minutes to find your exposed MCP server on Shodan, enumerate every tool without credential… - [MCP Security in 2026: Tool Poisoning, OWASP MCP Top 10, and How to Protect Your Agents](https://mcpplaygroundonline.com/blog/mcp-security-tool-poisoning-owasp-top-10-mcp-scan): The biggest security threats to MCP servers and agents in 2026: tool poisoning attacks, prompt injection, rug pulls, and… - [Safeguarding MCP Servers From Prompt Injection: Practical Tips From Real-World Builds](https://mcpplaygroundonline.com/blog/safeguarding-mcp-servers-from-prompt-injection): Once you give an LLM access to tools, files, or APIs through MCP, things get real very quickly. Here are practical appro… - [Are MCP Servers Secure? Complete Security Guide (2026)](https://mcpplaygroundonline.com/blog/why-security-matters-in-mcp-servers): Are MCP servers secure? Learn MCP server security best practices, risks, and how to protect your systems. Complete guide… ### AI Models - [Do Speed Tiers Make MCP Agents Faster? GLM 5.3 & Qwen Prime](https://mcpplaygroundonline.com/blog/mcp-agent-latency-speed-tiers): GLM 5.3 Prime and Qwen 3.8 Max Prime promise 1.5–2× the throughput for 2× the price. The first public numbers show Qwen … ### Opinion - [Why Your SaaS Needs an MCP Server: It Is a Buying Criterion Now](https://mcpplaygroundonline.com/blog/why-your-saas-needs-an-mcp-server): Buyers have started screening vendors for an official MCP server before they sign. I pulled the numbers from a 24,011-se… ### Testing - [What Is an MCP Eval? Why Your Server Passes Every Test and Still Fails](https://mcpplaygroundonline.com/blog/what-is-an-mcp-eval): An MCP test tells you the protocol works. An MCP eval tells you the server is usable. The difference shows up in the fai… - [Why Testing MCP Servers With Real AI Models Matters (2026)](https://mcpplaygroundonline.com/blog/testing-mcp-servers-with-real-ai-models): A curl request proves your MCP server responds. It says nothing about whether a model can actually use it. Here is why t… - [How QA Teams Should Test MCP Servers](https://mcpplaygroundonline.com/blog/how-qa-teams-should-test-mcp-servers): A simple guide for ensuring security, reliability, and correct behavior. Learn how QA teams can effectively test MCP ser… ### Tutorial - [Build Your First MCP AI Agent — No Code, Right in Your Browser (2026)](https://mcpplaygroundonline.com/blog/build-first-mcp-agent-no-code): Build a no-code AI agent in minutes — connect an MCP server, pick a model, and chat. A beginner walkthrough for your fir… - [How to Use MCP Agent Studio to Optimize Your AI Workflows](https://mcpplaygroundonline.com/blog/mcp-agent-studio-optimize-ai-workflows): MCP Agent Studio is more than a chat box — it is a tuning bench for AI workflows. Here is how to use it to pick the righ… - [Connect Your MCP Server With MiniMax M3 & M2.7 (2026 Guide)](https://mcpplaygroundonline.com/blog/testing-mcp-with-minimax): Connect any MCP server to MiniMax M3, M2.7, or M2.5 in about 60 seconds — paste the URL, pick the model, watch every too… - [Test MCP With Grok (xAI): Setup Guide for Grok 4.3 + Remote MCP Tools (2026)](https://mcpplaygroundonline.com/blog/testing-mcp-with-grok-xai): Connect any MCP server to Grok 4.3 — using xAI’s Remote MCP Tools, the OpenAI-compatible Responses API, Grok Build CLI, … - [MCP Agent Studio: Chat with Your MCP Server Using AI (Complete Guide)](https://mcpplaygroundonline.com/blog/mcp-agent-studio-guide): MCP Agent Studio lets you have a real AI conversation that drives your MCP server's tools — no code, no config, just pas… - [MCP Config File Location: Claude Desktop, Cursor & Claude Code (Mac, Windows, Linux)](https://mcpplaygroundonline.com/blog/complete-guide-mcp-config-files-claude-desktop-cursor-lovable): Exact MCP config file paths and JSON for Claude Desktop, Cursor, Claude Code, Cline, Continue, Zed and Lovable — plus a … - [How to Test Any MCP Server Online — No Setup Required](https://mcpplaygroundonline.com/blog/how-to-test-mcp-server-online-no-setup-required): You built (or found) an MCP server and want to see what it actually does before wiring it into your editor. This guide s… - [Where to Host MCP Servers for Free: Cloudflare, Vercel, and More (2026)](https://mcpplaygroundonline.com/blog/free-mcp-server-hosting-cloudflare-vercel-guide): Compare every free MCP server hosting option in 2026. Deploy to Cloudflare Workers, Vercel, FastMCP Cloud, mcphosting.io… - [Deploy an MCP Server to Production with Docker (Complete Guide)](https://mcpplaygroundonline.com/blog/deploy-mcp-server-docker-production-guide): How to containerize and deploy an MCP server for production. Covers Dockerfile, Docker Compose, StreamableHTTP transport… - [Multi-Agent AI with MCP: How to Use CrewAI and LangChain with MCP Servers](https://mcpplaygroundonline.com/blog/multi-agent-mcp-crewai-langchain-guide): Build multi-agent AI systems that use MCP servers for tools. Practical guide with CrewAI and LangChain examples — connec… - [Context7 MCP Server: Up-to-Date Docs for Your AI Coding Assistant (Setup Guide)](https://mcpplaygroundonline.com/blog/context7-mcp-server-setup-guide): Context7 is an MCP server that fetches up-to-date library documentation so your AI assistant can reference current APIs … - [Claude Code MCP Setup: Config File Location & Add Server Command (2026)](https://mcpplaygroundonline.com/blog/claude-code-mcp-setup-best-servers-guide): Claude Code MCP config lives in ~/.claude.json (user scope) or .mcp.json (project scope). Full file paths on Mac, Window… - [ChatGPT MCP Support: Complete Setup Guide with OpenAI Agents SDK](https://mcpplaygroundonline.com/blog/chatgpt-mcp-openai-agents-sdk-setup-guide): ChatGPT now supports MCP servers. Learn how to connect MCP servers to ChatGPT via the OpenAI Agents SDK — hosted tools, … - [Build Your First MCP Server with Python and FastMCP (Step-by-Step Tutorial)](https://mcpplaygroundonline.com/blog/build-mcp-server-python-fastmcp-tutorial): Learn to build a Model Context Protocol server in Python using FastMCP. Step-by-step tutorial with tools, resources, Cla… - [AWS MCP Servers - Complete Guide to Amazon Web Services MCP Integration](https://mcpplaygroundonline.com/blog/aws-mcp-servers): Learn how to use AWS MCP servers to connect Claude and Cursor to Amazon Web Services. Setup guides for S3, Lambda, EC2, … - [How to Set Up MCP in Claude Desktop (Complete 2026 Guide)](https://mcpplaygroundonline.com/blog/how-to-setup-mcp-claude-desktop): Step-by-step guide to configure MCP servers in Claude Desktop for April 2026. Covers the official GitHub MCP server (Doc… - [Cursor IDE MCP Setup: mcp.json Location, Format & 20+ Server Examples (2026)](https://mcpplaygroundonline.com/blog/cursor-mcp-setup-guide): Cursor IDE MCP config lives in ~/.cursor/mcp.json (global) or .cursor/mcp.json in your project. Full mcp.json format, wh… - [How to Publish Your MCP Server to the MCP Registry (Step-by-Step Guide)](https://mcpplaygroundonline.com/blog/how-to-publish-your-mcp-server-to-registry): Learn how to publish your MCP server to the official MCP Registry so others can discover and use it. Includes testing ti… ### Recipe - [MongoDB MCP Server: Build an AI Agent for Natural-Language Mongo Queries](https://mcpplaygroundonline.com/blog/mongodb-mcp-server-natural-language-queries-ai-agent): Spin up a hosted MongoDB MCP server in seconds — or self-host the official mongodb-mcp-server. Connect Claude, GPT-5, Ge… - [Datadog MCP: AI-Powered Alert Triage and Dashboard Queries (Bits AI Setup)](https://mcpplaygroundonline.com/blog/datadog-mcp-server-ai-alert-triage-dashboard-queries): Connect Claude (or GPT, Gemini, Grok) to Datadog with the official Bits AI MCP server. Triage alerts, query metrics, sea… - [Build an AI Standup Bot with Slack + Gmail MCP (Complete Recipe)](https://mcpplaygroundonline.com/blog/slack-email-standup-bot-mcp-recipe): Step-by-step guide to building an AI standup bot that reads your Slack channels and Gmail inbox, synthesises key updates… - [Build an AI E-commerce Order Manager with Stripe MCP + Shopify MCP](https://mcpplaygroundonline.com/blog/ecommerce-order-manager-stripe-shopify-mcp-recipe): Manage orders, refunds, and products with AI. Use the official Stripe MCP and Shopify Storefront MCP to look up payments… - [PostgreSQL MCP: Build a Claude Analytics Agent (Setup + Examples)](https://mcpplaygroundonline.com/blog/postgres-mcp-claude-analytics-agent-recipe): Connect Claude to PostgreSQL with the official Postgres MCP server. Run natural language queries, explore schemas, and b… - [Playwright MCP: Browser Automation with AI (Complete Setup Guide)](https://mcpplaygroundonline.com/blog/playwright-mcp-browser-automation-recipe): Spin up a hosted Playwright MCP server in seconds — or run the official Microsoft Playwright MCP locally for Claude, Cur… - [Build an AI Code Documentation Generator with MCP (GitHub + Filesystem Recipe)](https://mcpplaygroundonline.com/blog/code-documentation-generator-github-mcp-recipe): Auto-generate READMEs, API docs, and code summaries with AI. Use GitHub MCP and Filesystem MCP to read repos and source … - [Build an AI Customer Support Summarizer with MCP (Intercom + Zendesk Recipe)](https://mcpplaygroundonline.com/blog/customer-support-summarizer-intercom-zendesk-mcp-recipe): Summarize support tickets and conversations with AI. Use Intercom MCP and Zendesk MCP to pull recent tickets, generate d… - [Build an AI-Powered File Organizer with MCP (Filesystem + Google Drive Recipe)](https://mcpplaygroundonline.com/blog/ai-powered-file-organizer-mcp-recipe): Automate file sorting and organization with AI. Use Filesystem MCP and Google Drive MCP to sort downloads, organize fold… - [Build an AI GitHub PR Reviewer with MCP (Complete Recipe)](https://mcpplaygroundonline.com/blog/build-ai-github-pr-reviewer-mcp-recipe): Step-by-step guide to building an automated AI code reviewer that analyzes GitHub pull requests, suggests improvements, … - [Build an AI Database Query Assistant with Natural Language SQL (MCP Recipe)](https://mcpplaygroundonline.com/blog/build-ai-database-query-assistant-natural-language-sql): Learn to build an AI assistant that converts natural language questions into SQL queries. Query databases using plain En… - [Automate Jira Tasks from Meeting Notes with AI (Notion + Jira MCP Recipe)](https://mcpplaygroundonline.com/blog/automate-jira-tasks-from-meeting-notes-notion-mcp-recipe): Stop manually creating Jira tickets after meetings. Learn to automatically extract action items from Notion meeting note… ### Automation - [5 MCP Automation Recipes Every Developer Should Steal in 2026](https://mcpplaygroundonline.com/blog/mcp-automation-workflows-developer-recipes-2026): Playwright MCP lets Claude run and fix browser tests in a closed loop. GitHub MCP turns a natural language prompt into a… - [How to Automate Reddit Ads with Claude AI and MCP — Subreddit Intelligence, Community Targeting, and Real Results](https://mcpplaygroundonline.com/blog/reddit-ads-mcp-claude-automation-guide): Reddit's eCPM is $2.29 versus Meta's $11.73 — but most advertisers never unlock why certain subreddits convert and other… - [Cross-Platform Ad Reporting with Claude AI and MCP — One Prompt for All Your Ad Data](https://mcpplaygroundonline.com/blog/cross-platform-ad-reporting-mcp-claude-guide): Most advertisers optimize each platform in a silo and never see the full picture. The real waste in paid media isn't ins… - [How to Automate Snapchat Ads with Claude AI and MCP — AR Intelligence, Story Performance, and Real Results](https://mcpplaygroundonline.com/blog/snapchat-ads-mcp-claude-automation-guide): Snapchat reaches 90% of 13–24 year olds — but most advertisers never get past surface-level metrics. Swipe-up rate, stor… - [How to Automate X (Twitter) Ads with Claude AI and MCP — Honest Workflows for a Platform in Transition](https://mcpplaygroundonline.com/blog/x-twitter-ads-mcp-claude-automation-guide): X shipped an official MCP server at api.x.com/mcp in June 2026 — but it does not touch advertising. Here is what XMCP ac… - [How to Automate TikTok Ads with Claude AI and MCP — Workflows, Creative Intelligence, and Real Results](https://mcpplaygroundonline.com/blog/tiktok-ads-mcp-claude-automation-guide): TikTok shipped an official MCP server — no developer app, no approval queue, just sign in with your TikTok for Business … - [How to Automate Pinterest Ads with Claude AI and MCP — E-Commerce Workflows, Shopping Ads, and Real Results](https://mcpplaygroundonline.com/blog/pinterest-ads-mcp-claude-automation-guide): Pinterest is the only ad platform where users arrive already planning to buy. Save rate, closeup rate, and shopping cata… - [How to Automate Google Ads with Claude AI and MCP — Tools, Workflows, and Real Results](https://mcpplaygroundonline.com/blog/google-ads-mcp-claude-automation-guide): The Google Ads MCP server gives Claude live access to your campaign data. Here is how to connect it, which of the four a… - [How to Automate Amazon Ads with Claude AI and MCP — Workflows, Tools, and Real Results](https://mcpplaygroundonline.com/blog/amazon-ads-mcp-claude-automation-guide): Amazon's official MCP server launched in open beta February 2026, giving Claude live access to Sponsored Products, DSP, … - [How to Automate LinkedIn Ads with Claude AI and MCP — B2B Workflows That Actually Work](https://mcpplaygroundonline.com/blog/linkedin-ads-mcp-claude-b2b-automation-guide): LinkedIn drives 75–85% of B2B social leads, and most of that spend is managed manually. The LinkedIn Ads MCP server give… - [10 Real Automations You Can Build with Zapier MCP + Claude Right Now](https://mcpplaygroundonline.com/blog/zapier-mcp-claude-automations-guide): Zapier MCP gives Claude live access to 8,000+ apps. Here are 10 practical automations — from morning briefing agents to … - [How to Automate Meta Ads with Claude AI and MCP — Real Workflows, Real Results](https://mcpplaygroundonline.com/blog/automate-meta-ads-claude-ai-mcp): Meta shipped an official MCP server at mcp.facebook.com/ads in April 2026 — no Developer App, no App Review, just Busine… ### MCP - [MCP 2026 Roadmap: Linux Foundation Move, MCP Apps & A2A Protocol Updates](https://mcpplaygroundonline.com/blog/mcp-2026-roadmap-whats-changing-for-developers): Model Context Protocol 2026 roadmap explained: MCP joined the Linux Foundation on Dec 9, 2025. MCP Apps shipped Jan 26, … ### Deployment - [How to Deploy MCP Servers: Vercel vs Railway vs Render vs Heroku vs Fly.io (2026 Guide)](https://mcpplaygroundonline.com/blog/deploy-mcp-server-vercel-railway-render-heroku-flyio): Complete guide to deploying remote MCP servers on the top 5 cloud platforms. Compare Vercel, Railway, Render, Heroku, an… ## Optional - [Full content](https://mcpplaygroundonline.com/llms-full.txt): Every tool page and guide inlined in full — one fetch instead of following the links above. - [Sitemap](https://mcpplaygroundonline.com/sitemap.xml): Full XML sitemap of all pages. Every link on this page also serves clean Markdown: append `.md` to the URL (the homepage is at https://mcpplaygroundonline.com/index.md), or send the header `Accept: text/markdown`. The Markdown is the same content with the navigation, scripts and layout removed.