feat(ui): add /tokens /context /cost commands (#224) - #281
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New slash commands report token usage, context-window consumption, and estimated cost for the current session. Token usage comes from the session entry; context size is estimated from the active messages; cost uses a DeepSeek pricing table. (cherry picked from commit feaf159f38a141e1888323f6131a12478d81e87e)
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Summary
/tokens,/context, and/costslash commands report token usage, context-window consumption, and estimated cost for the current session.Why
Token usage was already tracked in session entries but invisible from the CLI. Users had no way to check how much context they had used, what was consuming it, or what a session cost — important for paid/reasoning models and for debugging context-limit issues.
Changes
packages/cli/src/ui/core/token-usage.ts(new): context estimation (chars/4 over active messages), DeepSeek pricing table, and report formatters.packages/cli/src/ui/core/slash-commands.ts: register/tokens,/context,/cost.packages/cli/src/ui/views/PromptInput.tsx+App.tsx: wire the commands to compute and display the report.packages/cli/src/tests/token-usage.test.ts(new) +slash-commands.test.ts: unit tests.Validation
npm run typecheck✅npm test— CLI suite passes (306/306) ✅Closes #224