HTTP MCP server with custom auth headers fails to register tools

Related Claude Code issues

Matched on shared title terms, labels, topic and reported release — ranked so issues with real discussion come first.

• [BUG] HTTP MCP server custom headers not being sent to server
  Resolved 💬 2 #14976
• [BUG] HTTP MCP server custom headers not being sent to server
  Resolved 💬 3 #14977
• HTTP transport: custom headers (-H) not sent during MCP session establishment
  Resolved 💬 5 #29562
• Documentation error: SSE server with custom headers
  Resolved 💬 2 #2308
• [BUG] /mcp UI shows "Auth: not authenticated" for HTTP MCP servers using Bearer token headers
  Resolved 💬 4 v2.1.2 #17152
• Custom headers from .mcp.json not forwarded on MCP tool call POST requests
  Resolved 💬 6 #28293
• [BUG] HTTP MCP servers (e.g., Atlassian MCP) with pre-configured auth headers fall back to OAuth in GitHub Actions (headless CI)
  Resolved 💬 5 #47515
• Streamable HTTP MCP: headers and headersHelper not sent with requests
  Resolved 💬 3 #48514

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