fix: Make every COST cell answer for its own row, and publish the output half - #980
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…put half The COST column mixed two units. A request row showed a prompt-only figure while its response row showed the whole exchange, so a row divided into its own rate only by accident: against a 641k-token cache-heavy turn the response cell rendered $3.0652 beside 1,075 output tokens — $2,851/MTok to anyone reading that row on its own — and invited the total to be summed again with the request row above it. TOKENS was already row-local, which made the mismatch invisible until the two columns were read together. A response row now shows what its generated tokens cost. That figure is priced from the rate table in authlib/costing exactly as the prompt half already is — zero the other tiers, price what is left — and published as output_usd. Not cost_usd minus prompt_usd. The total may be the gateway's while both halves are always the table's, so their difference concentrates the whole modelling error into the completion figure and can go negative: on the turn above the gateway charged 3.0652 against a modelled 4.0063 prompt, which differences to -0.94. TestSettle_PricesPromptAndOutputHalvesSeparately pins that fixture. The exchange total stays on the record for the detail view and the drift check, and deliberately does not backfill a blank cell. An older proxy publishes no output_usd, and falling back to the total there would restore exactly the cumulative reading this removes — so the cell stays blank, as a request row already does without a prompt figure. This also gives the prompt half its first producer-side test: authlib/costing had none, despite a comment in abctl stating the weighting was tested there. Verified: go test ./authlib/... and ./tui/... pass; go vet clean; golangci-lint --new-from-rev=upstream/main reports 0 issues on both modules; gofmt clean. TestRunExec_BeforeFirstStartRunsAndSaysWhatIsLost fails identically on an unmodified upstream/main and is unrelated. Assisted-By: Claude (Anthropic AI) <noreply@anthropic.com> Signed-off-by: Hai Huang <huang195@gmail.com>
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📝 WalkthroughWalkthroughThe change adds separately modelled output-token cost data to settlement results and cost events. The TUI uses this data for response-row costs and leaves older records without the field blank. Tests and plugin documentation cover the new behavior. ChangesOutput Cost Reporting
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant Settle
participant CostEvent
participant TUI
Settle->>CostEvent: publish output_usd
CostEvent->>TUI: provide cost record
TUI->>TUI: render response-row output cost
Suggested reviewers: Merge Risk: 🟡 Moderate · up to Responses from models with context-tier pricing can display an incorrect output cost for requests above a prompt threshold. Preserve the original prompt total during rate resolution before merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@authbridge/authlib/costing/costing.go`:
- Line 245: Update Settle’s modelledCost rate-resolution call to pass
usage.PromptTotal() as the prompt total, while continuing to pass outputOnly to
pricing.Cost; preserve the existing resolved-rate handling and add coverage for
an output threshold crossing a context boundary.
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authbridge/authlib/costevent/costevent.goauthbridge/authlib/costing/costing.goauthbridge/authlib/costing/costing_test.goauthbridge/cmd/abctl/tui/cost_event.goauthbridge/cmd/abctl/tui/cost_event_test.goauthbridge/cmd/abctl/tui/events_pane.goauthbridge/cmd/abctl/tui/local_preview_test.goauthbridge/docs/plugin-catalog.md
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Review catch on the output half: a context threshold never fired for it. modelledCost keyed the rate lookup on u.PromptTotal() — the prompt size of the usage being priced. outputOnly zeroes all three prompt tiers, so its PromptTotal is 0, Table.Resolve flattened at At(0), and the premium was skipped. On the Sonnet 4.5 family (bundled.go: TierOutput 1.5e-05 -> 2.25e-05 above 200k) a 641k-token turn had its completion priced at the base rate while the whole-request figure used the above-threshold one: 33% low, and PromptUSD + OutputUSD no longer summed to ModelledUSD, with the entire shortfall landing in the completion figure. Invisible in the PR's own numbers because claude-opus-5 has no threshold. A threshold is a property of the REQUEST, not of whatever slice is being priced — Rates.At puts it that way: the premium is priced on how much prompt was sent, not on what came back. So promptTotal is now an explicit parameter, passed identically for the whole request and both halves. That is also what makes the halves a partition: one flattening, three complementary tier sets. The same lookup priced tool-prune's avoided tokens, keyed on the saving's own count — ~9.3k tokens resolve at At(9300) and miss a 200k threshold the request they came out of is well past. Fixed at the same call site, since the parameter forces the question to be answered per caller and the answer there is the same one. Also from review: - the OutputUSD doc over-claimed. It read as banning subtraction generally, when the objection is only to mixing sources: ModelledUSD - PromptUSD is sound (same table, same prompt size, complementary tiers), and CostUSD - PromptUSD is not. Pricing directly is still preferred, because it keeps HasOutput independent of HasModelled. The exactness claim is now "to the micro" — each figure rounds independently. - TestSettle_PricesPromptAndOutputHalvesSeparately's partition assertion could not fail: its fixture had no Thresholds. The table now carries one at 200k raising every tier, and the fixture's 641k prompt is past it. Verified red: with the lookup keyed on the slice again, OutputUSD is 0.026875 against an expected 0.03225, the partition breaks at 5.154911 vs 5.160286, and the saving prices at 6.25e-06/token instead of 8e-06. The table moved to a tieredTable helper now that two tests need it. - cost_usd's "what the request cost" read wrong beside two named halves; it is the whole exchange. Verified: go test ./authlib/... and ./tui/... pass; go vet clean; golangci-lint --new-from-rev=upstream/main 0 issues; gofmt clean. Assisted-By: Claude (Anthropic AI) <noreply@anthropic.com> Signed-off-by: Hai Huang <huang195@gmail.com>
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Reviewed the full diff (575 lines, 2 commits). Clean follow-on to the #920 pricing work — makes each COST cell row-local instead of mixing prompt-only and whole-exchange figures.
Areas reviewed: Go (authlib/costing, costevent, abctl TUI), Go tests, docs. Commits: 2, both signed-off. CI: all 24 checks passing.
What I verified:
- The pricing argument is sound.
output_usdis priced directly (zero the prompt tiers, price what's left) rather than ascost_usd − prompt_usd— which correctly avoids mixing a possibly-gateway total with a table half, a difference that can go negative. The wire-field comment, thecostCelldoc comment, andTestSettle_PricesPromptAndOutputHalvesSeparatelyall state this consistently, and the negative-difference fixture (gateway 3.0652 vs modelled prompt) is actually pinned. - The deeper fix is the threshold parameter.
modelledCostnow takes the request'spromptTotalexplicitly instead of deriving it from the slice'su.PromptTotal(). I checked all four call sites — modelled total, prompt half, output half, andavoided.go's savings — and every one keys the rate lookup on the request's prompt size, so a >200k long-context premium can't land on the whole and miss the halves (the oldAt(0)bug). Confirmedavoided.go'spromptis the request total, not the saving's own count. - Backward-compat is right.
output_usdis additive +omitempty; a missing figure renders blank, deliberately not backfilled with the total — guarded by a regression test — and the PR correctly notes the proxy must ship with abctl. - Tests are load-bearing (tier-distinct rates pin the three specific wrong outputs; halves partition the modelled total to the micro). Docs updated. No secrets.
No must-fix issues, nothing worth an inline note — the reasoning is fully captured in the code comments. 精益求精 (jīngyì-qiújīng — "refining the already-fine") — a genuinely subtle correctness fix, cleanly argued. 👍
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Problem
The
COSTcolumn mixed two units. A request row showed a prompt-only figure; itsresponse row showed the whole exchange. Since
TOKENSis row-local on both rows, aresponse row put a cumulative dollar figure beside an incremental token count:
Read on its own, that response row implies an output rate of $2,851/MTok. It also
invites the total to be summed again with the request row above it. The real cost of that
response was $0.0204.
Solution
A response row now shows what its own generated tokens cost.
authlib/costing.Settlederives an output-only figure the same way it already derives theprompt half — zero the other tiers, price what is left through the rate table — and
publishes it as
output_usd.abctlreads it, as it already readsprompt_usd.Not
cost_usd − prompt_usd. The total may be the gateway's while both halves are alwaysthe table's, so their difference concentrates the whole modelling error into the completion
figure and can go negative. On the turn above the gateway charged $3.0652 against a modelled
$4.0063 prompt, which differences to −$0.94;
TestSettle_PricesPromptAndOutputHalvesSeparatelypins that fixture. ThecostCelldoccomment already argued against subtraction — this supplies the figure it said was missing
("no plugin publishes an output rate").
$3.0448(−$0.0463)$3.0652— the exchange total$0.0204— the outputThe exchange total stays on the record for the detail view and the drift check in
authlib/costing. It deliberately does not backfill a blank cell: an older proxypublishes no
output_usd, and falling back to the total there would restore exactly thecumulative reading this removes — so the cell stays blank, as a request row already does
without a prompt figure. This means the proxy must be rebuilt alongside
abctl; a newabctlagainst an old proxy shows a blank response cost rather than a wrong one.Changes
authlib/costing—Settled.OutputUSD/HasOutput, computed inSettle, carried byNewRecordauthlib/costevent—output_usdon the wire, additive +omitemptylikeprovenancecmd/abctl/tui—outputCostmirroringpromptCost;costCell's response branch; thedoc comment, which asserted the old semantics as deliberate
docs/plugin-catalog.md—output_usdin the cost-record field tableTesting
TestCostCellPhasesandTestSplitColumnsRenderupdated to the row-local expectation,plus two new guards: the response cell must fall below the prompt cell on a
cache-heavy turn (the old total was above it), and a record without
output_usdmustrender blank rather than the total
TestOutputCost_ReadsThePublishedFigure— reads the published figure, declines to inventone, and asserts it is not the total-minus-prompt difference
TestSettle_PricesPromptAndOutputHalvesSeparately— tier-distinct rates (a real Opuscard's shape) prove each half is priced on its own tiers, that the halves partition the
modelled total, and that neither moves when the gateway's header wins. This is also the
prompt half's first producer-side test:
authlib/costinghad none, despite a commentin
abctlstating the weighting was tested there.go test ./authlib/...and./tui/...pass;go vetclean;golangci-lint --new-from-rev=upstream/mainreports 0 issues on both modules;gofmtclean.TestRunExec_BeforeFirstStartRunsAndSaysWhatIsLost("the child inherited a bundle path thatdoes not exist") fails identically on an unmodified
upstream/main— pre-existing andunrelated.
Assisted-By: Claude (Anthropic AI) noreply@anthropic.com
Summary by CodeRabbit
New Features
Bug Fixes
Documentation