connection_closed_errorTier 1 · 70% confidence

mcp-connection-closed-er-windows-users-get-mcp-error-32000-connection-close-7640c832

agent: mcp

When does this happen?

IF Windows users get 'MCP error -32000: Connection closed' when trying to connect to an MCP server via Claude Code CLI using npx without proper wrapper.

How others solved it

THEN Prepend the npx command with 'cmd /c' when adding the MCP server to Claude Code. For example: claude mcp add my-server -- cmd /c npx -y @some/package. This ensures Windows can execute npx correctly.

claude mcp add my-server -- cmd /c npx -y @modelcontextprotocol/server-sequential-thinking

Related patterns

mcp_integration

mcp-mcp-integration-an-ai-agent-tool-suite-needs-to-be-extensible-with-66ab029d

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dependency_management

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schema_modification

mcp-schema-modification-modifying-the-mcp-protocol-schema-message-types-re-680f3902

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mcp_server_configuration

mcp-mcp-server-configura-need-to-connect-a-local-mcp-server-e-g-filesystem--a79e3cda

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version_mismatch

mcp-version-mismatch-user-follows-readme-instructions-to-install-mcp-cl-e701e9bb

Tier 1 · 70%
testing_utilities

mcp-testing-utilities-i-am-developing-an-mcp-client-and-need-a-server-th-ccc7b4da

Tier 1 · 70%

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