session-mcp-servers-invisible-to-pre-existing-subagents

Session-scoped MCP servers (registered with -s project) are not visible to subagents that were dispatched before the server was registered mid-session. Permanent user-scope servers (registered at top-level mcpServers in ~/.claude.json without scope field) ARE visible to all subagents regardless of dispatch order. Always register any required session MCP servers before dispatching subagents, or use the Bash-tool fallback.

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