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Cursor IDE agent fails to recognize custom MCP servers

Users of the Cursor IDE are encountering an issue where the integrated agent cannot access custom MCP servers configured in `mcp.json`. While Cursor itself recognizes and lists these servers as active, the agent reports that they do not exist, only showing plugin-based MCP servers as available. This problem prevents users from leveraging their custom server tools within the chat agent, despite the servers functioning correctly when run independently. AI

IMPACT This issue impacts the usability of custom integrations within the Cursor IDE's AI agent, potentially hindering developer workflows that rely on these custom tools.

RANK_REASON User-reported bug in a specific software tool.

Read on r/cursor →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Cursor IDE agent fails to recognize custom MCP servers

COVERAGE [1]

  1. r/cursor TIER_2 English(EN) · /u/Snoo_9701 ·

    Agent can't see any of my custom MCP servers (only plugin ones show up)

    <!-- SC_OFF --><div class="md"><p>On Cursor 3.9.8 (macOS). My custom MCP servers defined in ~/.cursor/mcp.json show up fine in Settings -&gt; Tools &amp; Integrations: green dot, enabled, and their tools are listed. But when I ask the agent in chat to use one, it says the server …