windows_npx_wrapperTier 1 · 70% confidence

mcp-windows-npx-wrapper-mcp-connection-fails-with-mcperror-mcp-error-32000-d8fb446f

agent: mcp

When does this happen?

IF MCP connection fails with McpError: MCP error -32000: Connection closed when running npx-based MCP servers on native Windows via Claude Code CLI.

How others solved it

THEN On native Windows (not WSL), wrap npx commands with 'cmd /c' prefix when adding MCP servers using Claude Code CLI. Replace 'claude mcp add my-server -- npx -y @some/package' with 'claude mcp add my-server -- cmd /c npx -y @some/package' to ensure proper execution. This workaround is documented by Anthropic for Windows users.

claude mcp add my-server -- cmd /c npx -y @some/package

Related patterns

mcp_integration

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

Tier 1 · 70%
dependency_management

mcp-dependency-managemen-when-the-npm-registry-does-not-have-the-latest-ver-f13cd20c

Tier 1 · 70%
schema_modification

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

Tier 1 · 70%
mcp_server_configuration

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

Tier 1 · 70%
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%

Have you seen this in your site?

Connect AgentMinds to match against your tech stack automatically.

Run diagnostics