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fix: projection error

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This commit is contained in:
imccyu
2026-08-06 19:35:24 +08:00
parent 4d241d37e4
commit ed8431cdd0
9 changed files with 134 additions and 24 deletions
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14
packages/llm/token-meter/tests/context-breakdown-projection.spec.ts
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@@ -180,7 +180,7 @@ describe('contextBreakdown session projection', () => {
expect(agree()).toBeLessThan(grown)
})
it('fails loud on a replacement without an adjacent matching shadow price', () => {
it('folds a replacement without a claim at zero and fails on a mismatched claim', () => {
const definition = contextBreakdownProjectionDefinition
const replace = (start: number, end: number): SessionEvent => ({
type: 'user/message',
@@ -206,15 +206,17 @@ describe('contextBreakdown session projection', () => {
let state = definition.init()
state = definition.apply(state, append(1))
state = definition.apply(state, append(3))
// No metering event at all.
expect(() => definition.apply(state, replace(1, 3))).toThrow('no adjacent shadow price')
// A claim for a different range does not price this replacement.
// No metering event: the replacement contributes zero instead of throwing.
expect(definition.view(definition.apply(state, replace(1, 3))).messageTokens)
.toBe(definition.view(state).messageTokens)
// An adjacent claim for another range contradicts the replacement.
const mismatched = definition.apply(state, meter(1, 1, 8))
expect(() => definition.apply(mismatched, replace(1, 3))).toThrow('no adjacent shadow price')
// A claim expires after one intervening event instead of lingering.
// A claim expires after one intervening event, so replacement delta is zero.
let expired = definition.apply(state, meter(1, 3, 8))
expired = definition.apply(expired, { type: 'todo/write', seq: 9, time: 0, data: { todos: [] } } as unknown as SessionEvent)
expect(() => definition.apply(expired, replace(1, 3))).toThrow('no adjacent shadow price')
expect(definition.view(definition.apply(expired, replace(1, 3))).messageTokens)
.toBe(definition.view(state).messageTokens)
// The armed claim prices exactly the next event's matching replacement.
const armed = definition.apply(state, meter(1, 3, 8))
expect(definition.view(definition.apply(armed, replace(1, 3))).messageTokens)

19
packages/llm/token-meter/tests/token-usage-projection.spec.ts
View File

@@ -419,6 +419,25 @@ describe('contextPressure session projection', () => {
expect(compacted.projectedTokens).toBeLessThan(beforeCompaction!)
})
it('folds a replacement without a claim at zero', async () => {
const { ctx, session } = await harness()
const question = appendUser(session, 'a question from an unmetered log')
startStep(session, 1, 1)
usageChunk(session, { inputTokens: 100, outputTokens: 1 }, 1, 1)
session.append('step/end', { turn: 1, step: 1 })
const before = pressure(ctx, session)
session.append('user/message', createUserMessage({
content: [{ type: 'text', text: 'summary without a preceding claim' }],
source: { kind: 'plugin', plugin: 'test' },
}), {
surfaceOp: { op: 'replace', start: question, end: question },
sourceEventSeqs: [question],
})
expect(pressure(ctx, session)).toEqual(before)
})
it('clamps a projection that heuristic error drove below zero', async () => {
const { ctx, session } = await harness()
recordContext(session, 'large', 128_000)