{"slug": "5-prompts-to-give-your-coding-agent-before-you-ship-a-launch", "title": "5 prompts to give your coding agent before you ship a launch", "summary": "A developer released MarketMirror, an open-source MCP server and plugin that lets coding agents rehearse product launches against simulated buyers before shipping. The tool runs simulated ad tests, pricing surveys, pitch-and-rebuttal drills and website walkthroughs, returning labelled metrics such as a simulated Fitloop study where requiring a card dropped trial starts from 4.1% to 0.2%. It is installable via uvx from PyPI or the official MCP Registry and supports clients including Claude, Codex, Cursor and Gemini.", "body_md": "Your agent writes the landing page, the pricing table and the launch email. Then you ship, and find out from real customers what was wrong.\n\nYou can make the same agent rehearse the launch first. Install the MarketMirror plugin or MCP server once, then give it prompts like these.\n\nUse MarketMirror to test these three ads on young parents and students in India. Put them in Instagram and Facebook feeds and tell me which one people stop at, which one confuses them, and why.\n\nYou get thumb-stop, click and hide rates per ad and per audience, with the comments people left.\n\nSurvey 150 simulated buyers on USD 4.99 a month versus USD 2.99, with and without a card for the free trial. Run it three times and show me the range.\n\nIn one simulated Fitloop study, the card requirement dropped trial starts from 4.1% to 0.2%.\n\nRehearse this pitch and these rebuttals with the simulated buyers. Tell me which objections my rebuttals fix and which they make worse.\n\nIn the 2,999-person Fitloop run, the rebuttals pushed \"no\" from 34.8% to 54.2% (simulated). Better to learn that here.\n\nSend simulated visitors through [https://my-site.example](https://my-site.example) and record where they hesitate, leave or finish signing up.\n\nRun the same survey with Claude and Codex writing and playing different thirds of the market, and show me where they disagree.\n\nWhen they disagree, you've found the part of your plan that's least certain.\n\nThe quickest way, with [uv](https://docs.astral.sh/uv/) installed, is one entry in your agent's MCP config (the package is `marketmirror` on PyPI and in the official MCP Registry):\n\n```\n{ \"mcpServers\": { \"market-mirror\": { \"command\": \"uvx\", \"args\": [\"marketmirror\"] } } }\n```\n\nThen ask the agent to run `doctor` and `setup`. Or install from a clone:\n\n```\ngit clone https://github.com/DarkWorldCoder/market-mirror.git\ncd market-mirror\nbash install.sh\n./mm configure\n./mm agent-config --client claude   # also: codex, cursor, gemini, generic\n```\n\nEvery result is simulated and labelled so: use it to choose what to test for real.\n\n👉 **[https://github.com/DarkWorldCoder/market-mirror](https://github.com/DarkWorldCoder/market-mirror)** (a ⭐ helps other people find it)\n\n*Written with help from an AI assistant; numbers are from the saved simulated runs in the README.*", "url": "https://wpnews.pro/news/5-prompts-to-give-your-coding-agent-before-you-ship-a-launch", "canonical_source": "https://dev.to/ayushniroula/5-prompts-to-give-your-coding-agent-before-you-ship-a-launch-4kek", "published_at": "2026-10-30 02:42:14+00:00", "updated_at": "2026-10-30 02:49:11.877052+00:00", "lang": "en", "topics": ["ai-agents", "agent-protocols", "developer-tools", "ai-tools"], "entities": ["MarketMirror", "Fitloop", "Claude", "Codex", "Cursor", "Gemini", "PyPI", "MCP Registry"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/5-prompts-to-give-your-coding-agent-before-you-ship-a-launch", "markdown": "https://wpnews.pro/news/5-prompts-to-give-your-coding-agent-before-you-ship-a-launch.md", "text": "https://wpnews.pro/news/5-prompts-to-give-your-coding-agent-before-you-ship-a-launch.txt", "jsonld": "https://wpnews.pro/news/5-prompts-to-give-your-coding-agent-before-you-ship-a-launch.jsonld"}}