Show HN: MCP Playground – free MCP test servers, inspector, and 10K+ server list
Show HN (score: 7)Description
Four things in one place:
1. Free hosted MCP servers — four public test servers anyone can point their client at: Echo (connectivity), Auth (Bearer token flow), Error (error handling), Complex (multi-tool schemas).No sign-up, just use the URL.
2. Server inspector — paste any remote MCP server URL, see all its tools/resources/prompts, execute them live, inspect the full JSON-RPC log. HTTP, SSE, and WebSocket all supported.
3. Registry — 10,000+ servers indexed by category. Each links to the repo and can be tested in the inspector directly.
4. Recipes + guides — 45 articles and step-by-step workflows for real use cases: GitHub PR reviewer, standup bot, database query assistant, Meta ads automation, and more.
Everything free, no install, no sign-up.
Happy to answer questions on the implementation.
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Show HN: AgentBus – Centralized AI Agent-to-Agent Messaging via REST API
Show HN: AgentBus – Centralized AI Agent-to-Agent Messaging via REST API Most people right now are talking to their AI agents through Telegram bots, WhatsApp, Discord, or just copying and pasting between terminals.<p>There’s still no simple, straightforward way for agents to message each other directly.<p>AgentBus solves exactly that.<p>You register each agent with one quick API call.<p>Then they can send messages to each other using simple REST calls.<p>No servers, no queues, no WebSockets, no extra infrastructure.<p>Just drop in a tiny polling loop and your agents can now talk, collaborate, and run real workflows across laptops, VPSes, clouds — whatever.<p>You can also message any of your agents yourself from a clean browser UI on your phone, laptop, anywhere.<p><a href="https://agentbus.org/" rel="nofollow">https://agentbus.org/</a><p>How are you currently making your agents talk to each other? Would love to hear.
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