@primevue/mcp fails to start in Cursor with get_composable ToolAnnotations/Zod schema error

[Razzaghnoori]

Describe the bug

The PrimeVue MCP server fails to start in Cursor when configured as documented with:

{
  \"mcpServers\": {
    \"primevue\": {
      \"command\": \"npx\",
      \"args\": [\"-y\", \"@primevue/mcp\"]
    }
  }
}

Cursor is able to launch the command, but the server crashes during startup before exposing any tools.

Reproducer

1. Add this to project-level .cursor/mcp.json:

{
  \"mcpServers\": {
    \"primevue\": {
      \"command\": \"npx\",
      \"args\": [\"-y\", \"@primevue/mcp\"]
    }
  }
}

2. Restart/reload Cursor or refresh MCP servers.
3. Observe that the PrimeVue MCP server fails during initialization.

Actual behavior

PrimeVue MCP never finishes initializing and Cursor shows no available tools for the server.

Error log

2026-03-26 12:05:34.280 [info] Server creation in progress, waiting for completion
2026-03-26 12:05:34.356 [error] npm warn Unknown project config \"shamefully-hoist\". This will stop working in the next major version of npm.
2026-03-26 12:05:34.356 [error] npm warn Unknown project config \"strict-peer-dependencies\". This will stop working in the next major version of npm.
2026-03-26 12:05:42.047 [error] Failed to start PrimeVue MCP Server: Error: Tool get_composable expected a Zod schema or ToolAnnotations, but received an unrecognized object
    at McpServer.tool (file:///home/mohammad/.npm/_npx/e1e395eaa6dbfbb5/node_modules/@modelcontextprotocol/sdk/dist/esm/server/mcp.js:688:27)
    at F (file:///home/mohammad/.npm/_npx/e1e395eaa6dbfbb5/node_modules/@primeuix/mcp/dist/index.js:232:4752)
    at file:///home/mohammad/.npm/_npx/e1e395eaa6dbfbb5/node_modules/@primeuix/mcp/dist/index.js:232:4593
    at Generator.next (<anonymous>)
    at l (file:///home/mohammad/.npm/_npx/e1e395eaa6dbfbb5/node_modules/@primeuix/mcp/dist/index.js:1:54)
2026-03-26 12:05:42.083 [info] Client closed for command
2026-03-26 12:05:42.083 [warning] [V1] initializing -> error: Client closed
2026-03-26 12:05:42.083 [warning] Pending server creation failed: MCP error -32000: Connection closed
2026-03-26 12:05:42.099 [info] Server not yet created, returning empty offerings

Expected behavior

The PrimeVue MCP server should start successfully and expose its documented tools in Cursor.

Environment

• PrimeVue MCP package: @primevue/mcp via npx -y @primevue/mcp
• Cursor on Linux
• Project-level MCP config
• Node version used by npx on the local machine

Notes

The npm warnings about shamefully-hoist and strict-peer-dependencies appear to be non-fatal and likely unrelated.

The failure looks like a runtime compatibility problem while registering the get_composable tool, possibly around MCP SDK schema / ToolAnnotations handling.

[connorabbas]

The MCP server is also not working for me with OpenCode inside VS Code, it was working previously:

{
    "$schema": "https://opencode.ai/config.json",
    "mcp": {
        "laravel-boost": {
            "type": "local",
            "enabled": true,
            "command": [
                "php",
                "artisan",
                "boost:mcp"
            ]
        },
        "primevue": {
            "type": "local",
            "enabled": true,
            "command": [
                "npx",
                "-y",
                "@primevue/mcp"
            ]
        }
    }
}

primevue 4.5.4

[phungvansyhb]

got the same with vscode installation

2026-03-27 14:00:07.121 [warning] [server stderr] Failed to start PrimeVue MCP Server: Error: Tool get_composable expected a Zod schema or ToolAnnotations, but received an unrecognized object
2026-03-27 14:00:07.122 [warning] [server stderr]     at McpServer.tool (file:///C:/Users/63200467/AppData/Local/npm-cache/_npx/e1e395eaa6dbfbb5/node_modules/@modelcontextprotocol/sdk/dist/esm/server/mcp.js:688:27)
2026-03-27 14:00:07.123 [warning] [server stderr]     at F (file:///C:/Users/63200467/AppData/Local/npm-cache/_npx/e1e395eaa6dbfbb5/node_modules/@primeuix/mcp/dist/index.js:232:4752)
2026-03-27 14:00:07.123 [warning] [server stderr]     at file:///C:/Users/63200467/AppData/Local/npm-cache/_npx/e1e395eaa6dbfbb5/node_modules/@primeuix/mcp/dist/index.js:232:4593
2026-03-27 14:00:07.123 [warning] [server stderr]     at Generator.next (<anonymous>)
2026-03-27 14:00:07.124 [warning] [server stderr]     at l (file:///C:/Users/63200467/AppData/Local/npm-cache/_npx/e1e395eaa6dbfbb5/node_modules/@primeuix/mcp/dist/index.js:1:54)
2026-03-27 14:00:08.517 [info] Connection state: Error Process exited with code 1