feat: add CLI cost preview (openfusion ask --estimate) - #109
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Wires the existing /v1/estimate logic (openfusion.estimate.build_estimate + openfusion.pricing.get_prices) into a new `--estimate` flag on `openfusion ask`, so the roadmap's planned CLI cost preview works without running the prompt or requiring an upstream API key.
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Summary
--estimateflag toopenfusion askthat prints the calls/tokens/$a prompt would cost — reusing the existingopenfusion.estimate.build_estimate+openfusion.pricing.get_priceslogic that already backsPOST /v1/estimate— without running the prompt or requiring an upstream API key.Why it matters
POST /v1/estimateand the playground's live cost preview already existed, but there was no way to preview cost from the terminal before runningopenfusion ask— you had to just run it and see what it cost. This closes that gap with a small, self-contained change that reuses existing, well-tested estimate/pricing code paths.Test plan
pytest -q— 454 passed (4 new tests covering_print_estimatecost/no-pricing output and thatrun_ask(..., estimate=True)skips execution and the API-key check)ruff check .mypy openfusion/ --ignore-missing-imports --disable-error-code import-untyped --exclude openfusion/cli.pypython -c "from openfusion.cli import _ask_cli; _ask_cli(['--help'])"shows the new--estimateflagGenerated by Claude Code