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* refactor: Better UX for MCP stdio with Custom User Variables
- Updated the ConnectionsRepository to prevent connections when customUserVars are defined, improving security and access control.
- Modified the MCPServerInspector to skip capabilities fetch when customUserVars are present, streamlining server inspection.
- Added tests to validate connection restrictions with customUserVars, ensuring robust handling of various server configurations.
This change enhances the overall integrity of the connection management process by enforcing stricter rules around custom user variables.
* fix: guard against empty customUserVars and add JSDoc context
- Extract `hasCustomUserVars()` helper to guard against truthy `{}`
(Zod's `.record().optional()` yields `{}` on empty input, not `undefined`)
- Add JSDoc to `isAllowedToConnectToServer` explaining why customUserVars
servers are excluded from app-level connections
* test: improve customUserVars test coverage and fixture hygiene
- Add no-connection-provided test for MCPServerInspector (production path)
- Fix test descriptions to match actual fixture values
- Replace real package name with fictional @test/mcp-stdio-server
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