{"slug": "show-hn-turn-a-sandbox-into-an-mcp-server", "title": "Show HN: Turn a Sandbox into an MCP Server", "summary": "Developer 'mcpd' released a tool that exposes sandbox environments as MCP servers via configuration, enabling cloud agents to access code search tools on private repositories. The creator uses it with Sentry MCP to debug in Slack and is developing a secure method for agents to open pull requests. The project's thesis is that the agent loop should run unprivileged and remotely, separate from sandboxed tool execution.", "body_md": "mcpd is a way to expose sandbox environments as MCP servers using just configuration. In the repo, I have some example config files that mimic popular coding harness tools.\n\nI've been using it to give my cloud agents code search tools on private repos I manage. I have a script that syncs project code to the sandbox on deploy and I can connect it to my cloud agents and debug in Slack. It's awesome in combination with the Sentry MCP. I'm working on a secure way to have the agent open up PRs too.\n\nMy general thesis is the agent loop should be unprivileged and run remotely and tool execution should be separate and sandboxed. Disconnecting the loop and the tool execution environments opens up a lot of cool possibilities.\n\nComments URL: [https://news.ycombinator.com/item?id=49433211](https://news.ycombinator.com/item?id=49433211)\n\nPoints: 1\n\n# Comments: 0", "url": "https://wpnews.pro/news/show-hn-turn-a-sandbox-into-an-mcp-server", "canonical_source": "https://github.com/substructureai/mcpd", "published_at": "2026-08-25 12:54:59+00:00", "updated_at": "2026-08-25 13:17:11.373286+00:00", "lang": "en", "topics": ["developer-tools", "ai-agents", "ai-tools"], "entities": ["mcpd", "MCP", "Sentry MCP"], "alternates": {"html": "https://wpnews.pro/news/show-hn-turn-a-sandbox-into-an-mcp-server", "markdown": "https://wpnews.pro/news/show-hn-turn-a-sandbox-into-an-mcp-server.md", "text": "https://wpnews.pro/news/show-hn-turn-a-sandbox-into-an-mcp-server.txt", "jsonld": "https://wpnews.pro/news/show-hn-turn-a-sandbox-into-an-mcp-server.jsonld"}}