Desktop context inspection could send get_context_usage while a prewarmed CLI process existed but before the SDK socket was connected. That first control request sat in the pending outbound queue and could time out, leaving the composer spinner or a misleading empty-state context display. The server now waits for the SDK socket before sending control requests, and the UI renders the actual initial context snapshot instead of masking empty active-session data.
Constraint: CLI /context and desktop get_context_usage must stay on the shared collectContextData/analyzeContextUsage path
Rejected: Hide zero-token active snapshots in the component | that masks backend timing bugs and prevents showing real initial system/tool context
Confidence: high
Scope-risk: narrow
Directive: Do not queue control requests before the SDK socket is connected; let user messages keep the pending outbound behavior
Tested: bun test src/server/__tests__/conversations.test.ts --test-name-pattern "not queue control|context-only|prewarmed empty session|structured session inspection"
Tested: cd desktop && bun run test -- pages.test.tsx --test-name-pattern "EmptySession shows draft context|first-paint spinner|empty live session|live context usage|runtime model"
Tested: bun run check:server
Tested: cd desktop && bun run lint
Tested: real dev API prewarmed empty session returned 31,190 / 262,144 (12%) on first context-only inspection and 16ms on repeat
Tested: browser at http://127.0.0.1:5174/ showed 上下文用量 12% for an empty active session