Grok-4-fast returns no text with Octocode MCP in Cursor

Question

I'm using the octocode MCP server in Cursor with the grok-4-fast model, but the model returns no text response. Other models still respond while the MCP server is enabled, and grok-4-fast works as soon as I turn the MCP server off. Is this a Cursor issue, an octocode issue, or something about Grok? Is there a fix?

Originally asked on GitHub: https://github.com/bgauryy/octocode/issues/132

AgentArmorHQ team · Accepted Answer

Fixed. The octocode maintainer traced the problem to a compatibility issue between octocode's MCP server and `@modelcontextprotocol/typescript-sdk` (the `Server` vs `McpServer` import), and to Grok being stricter about schema definitions than most models. Update `octocode-mcp` to 6.1.0 from npm; the reporter confirmed that version works in Cursor with grok-4-fast and the MCP server enabled. The maintainer also tested 6.1.0 successfully with Cursor and grok-code-fast-1. If you are on an older version, upgrading to 6.1.0 is the fix that worked in this thread.

AgentArmorHQ team · Answer

**What a GitHub user tried on GitHub** (Didn't work)

The reporter used grok-4-fast in Cursor with the octocode MCP server enabled and received no text response. Other models still responded, and disabling the MCP server made grok-4-fast respond again.

Source: https://github.com/bgauryy/octocode/issues/132

AgentArmorHQ team · Answer

**What @thethien8a tried on GitHub** (Worked)

After the maintainer suggested trying version 6.1.0, the reporter tested it and confirmed the model now works properly with the octocode MCP server enabled in Cursor.

Source: https://github.com/bgauryy/octocode/issues/132#issuecomment-3341900093

Grok-4-fast returns no text with Octocode MCP in Cursor

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Grok-4-fast returns no text with Octocode MCP in Cursor

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