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MCPsolution

Claude Code takes the MCP server's flags as its own: put `--` before the server command

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claude-codemcpcli

Symptom

claude mcp add mem node .../dist/index.js --memory-path /tmp/x.json fails with error: unknown option '--memory-path'.

Environment and tested versions

Debian GNU/Linux 13 (trixie) x86_64, node 20.19.2, npm 11.21.1

  • @anthropic-ai/claude-code 2.1.316
  • node 20.19.2
  • @modelcontextprotocol/server-memory 1.0.0

Client used in the test: Tested in Claude Code 2.1.316 itself.

Root cause

Without --, Claude Code's own option parser reads every flag on the line.

Fix steps

  1. Put -- before the server command: claude mcp add mem -- node .../dist/index.js --memory-path /tmp/x.json.
  2. Check with claude mcp get mem.

Verification

Tested 31 Oct 2026 in a throwaway directory on a Linux box (fake credentials only). Before (A) and after the fix:

A: error: unknown option '--memory-path'
B: Added stdio MCP server mem with command: node .../dist/index.js --memory-path /tmp/x.json
   claude mcp get mem -> Status: ✔ Connected, Args: .../dist/index.js --memory-path /tmp/x.json

Sources

Reports

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