1import { assert, describe, it } from "@effect/vitest"
2import { Context, Effect, Layer, Schema, SchemaGetter } from "effect"
3import { Decision, DecisionModel, Model } from "effect/ai"
4import * as AiError from "effect/ai/AiError"
5
6const Ticket = Schema.Struct({
7 subject: Schema.String,
8 priority: Schema.FiniteFromString
9})
10
11const TicketTriage = Decision.make({
12 input: Ticket,
13 decisions: {
14 department: Decision.classify({
15 instructions: "Which team should handle this",
16 criteria: {
17 billing: "payments",
18 technical: "bugs",
19 sales: "pricing"
20 }
21 }),
22 frustration: Decision.rate({
23 instructions: "How frustrated",
24 criteria: ["calm", "frustrated", "angry"]
25 }),
26 urgent: Decision.probability({
27 instructions: "The message is time-sensitive",
28 criteria: {
29 false: "No time pressure",
30 true: "Needs action now"
31 }
32 })
33 }
34})
35
36const ticket = { subject: "Card was charged twice", priority: 3 }
37
38const expectedAnswers: Decision.Answers<typeof TicketTriage.decisions> = {
39 department: {
40 label: "billing",
41 probabilities: { billing: 0.8, technical: 0.15, sales: 0.05 },
42 confidence: 0.8
43 },
44 frustration: {
45 rating: 1.4,
46 label: "frustrated",
47 probabilities: { calm: 0.1, frustrated: 0.5, angry: 0.4 },
48 confidence: 0.5
49 },
50 urgent: {
51 probability: 0.9
52 }
53}
54
55const triageAnswers = {
56 department: { _tag: "Classify" as const, ...expectedAnswers.department },
57 frustration: { _tag: "Rate" as const, ...expectedAnswers.frustration },
58 urgent: { _tag: "Probability" as const, ...expectedAnswers.urgent }
59}
60
61const makeLayer = (
62 decide: (
63 options: DecisionModel.ProviderOptions
64 ) => Effect.Effect<DecisionModel.ProviderResponse, AiError.AiError>
65) =>
66 Layer.effect(
67 DecisionModel.DecisionModel,
68 DecisionModel.make({ decide })
69 )
70
71const succeedWith = (
72 answers: DecisionModel.ProviderResponse["answers"],
73 usage: DecisionModel.ProviderResponse["usage"] = { inputTokens: undefined, outputTokens: undefined }
74) => makeLayer(() => Effect.succeed({ answers, usage }))
75
76const failureOf = <A, E>(effect: Effect.Effect<A, E, DecisionModel.DecisionModel>) =>
77 effect.pipe(Effect.match({ onFailure: (error) => error, onSuccess: () => undefined }))
78
79class Redactor extends Context.Service<Redactor, {
80 readonly redact: (value: string) => string
81}>()("Redactor") {}
82
83const RedactedString = Schema.String.pipe(
84 Schema.decodeTo(Schema.String, {
85 decode: SchemaGetter.passthrough(),
86 encode: SchemaGetter.transformEffect<string, string, Redactor>((value) =>
87 Effect.map(Effect.service(Redactor), (redactor) => redactor.redact(value))
88 )
89 })
90)
91
92describe("Decision", () => {
93 it("make keeps the input schema and decisions", () => {
94 assert.strictEqual(TicketTriage.input, Ticket)
95 assert.deepStrictEqual(Object.keys(TicketTriage.decisions), ["department", "frustration", "urgent"])
96 assert.strictEqual(TicketTriage.decisions.department._tag, "Classify")
97 assert.strictEqual(TicketTriage.decisions.frustration._tag, "Rate")
98 assert.strictEqual(TicketTriage.decisions.urgent._tag, "Probability")
99 })
100
101 it("constructors keep instructions and criteria", () => {
102 assert.strictEqual(TicketTriage.decisions.department.instructions, "Which team should handle this")
103 assert.deepStrictEqual(TicketTriage.decisions.department.criteria, {
104 billing: "payments",
105 technical: "bugs",
106 sales: "pricing"
107 })
108 assert.deepStrictEqual(TicketTriage.decisions.frustration.criteria, ["calm", "frustrated", "angry"])
109 assert.deepStrictEqual(TicketTriage.decisions.urgent.criteria, {
110 false: "No time pressure",
111 true: "Needs action now"
112 })
113 })
114
115 it("probability accepts omitted criteria", () => {
116 const decision = Decision.probability({ instructions: "Needs action now" })
117
118 assert.strictEqual(decision._tag, "Probability")
119 assert.strictEqual(decision.instructions, "Needs action now")
120 assert.strictEqual(decision.criteria, undefined)
121 })
122
123 it("probability preserves explicit criteria, including empty descriptions", () => {
124 const criteria = { false: "", true: "Needs action now" }
125 const decision = Decision.probability({ instructions: "Is urgent", criteria })
126
127 assert.strictEqual(decision.instructions, "Is urgent")
128 assert.strictEqual(decision.criteria, criteria)
129 })
130
131 it("make fails on empty decisions", () => {
132 assert.throws(() => Decision.make({ input: Schema.String, decisions: {} }))
133 })
134
135 it("rate fails with fewer than two criteria", () => {
136 assert.throws(() => Decision.rate({ instructions: "How much", criteria: ["only"] as any }))
137 })
138})
139
140describe("DecisionModel", () => {
141 it.effect("probability without criteria reaches the provider and returns an answer", () => {
142 const definition = Decision.make({
143 input: Schema.String,
144 decisions: {
145 urgent: Decision.probability({ instructions: "Needs action now" })
146 }
147 })
148 const calls: Array<DecisionModel.ProviderOptions> = []
149
150 return Effect.gen(function*() {
151 const { answers } = yield* DecisionModel.decide(definition, { input: "Help now" })
152
153 assert.strictEqual(calls.length, 1)
154 assert.strictEqual(calls[0].state, "Help now")
155 assert.strictEqual(calls[0].decisions, definition.decisions)
156 assert.strictEqual(calls[0].decisions.urgent.criteria, undefined)
157 assert.deepStrictEqual(answers, { urgent: { probability: 0.9 } })
158 }).pipe(
159 Effect.provide(makeLayer((options) => {
160 calls.push(options)
161 return Effect.succeed({
162 answers: { urgent: triageAnswers.urgent },
163 usage: { inputTokens: undefined, outputTokens: undefined }
164 })
165 }))
166 )
167 })
168
169 for (const key of ["__proto__", "constructor", "toString"]) {
170 it.effect("preserves the own enumerable rate probability " + key, () => {
171 const definition = Decision.make({
172 input: Schema.String,
173 decisions: {
174 intensity: Decision.rate({
175 instructions: "How intense",
176 criteria: ["low", key, "high"]
177 })
178 }
179 })
180
181 return Effect.gen(function*() {
182 const { answers } = yield* DecisionModel.decide(definition, { input: "Help" })
183 const { label, probabilities, rating } = answers.intensity
184
185 assert.isTrue(Object.hasOwn(probabilities, key))
186 assert.isTrue(Object.getOwnPropertyDescriptor(probabilities, key)?.enumerable)
187 assert.deepStrictEqual(Object.keys(probabilities), ["low", key, "high"])
188 assert.deepStrictEqual(probabilities, { low: 0.1, [key]: 0.7, high: 0.2 })
189 assert.strictEqual(label, key)
190 assert.strictEqual(rating, 1.1)
191 assert.strictEqual(Object.getPrototypeOf(probabilities), null)
192 }).pipe(Effect.provide(succeedWith({
193 intensity: { _tag: "Rate", rating: 1.1, probabilities: { low: 0.1, [key]: 0.7, high: 0.2 } }
194 })))
195 })
196
197 it.effect("preserves the own enumerable answer key " + key, () => {
198 const definition = Decision.make({
199 input: Schema.String,
200 decisions: {
201 [key]: Decision.probability({
202 instructions: "Needs action now",
203 criteria: { false: "No", true: "Yes" }
204 })
205 }
206 })
207
208 return Effect.gen(function*() {
209 const { answers } = yield* DecisionModel.decide(definition, { input: "Help" })
210
211 assert.strictEqual(Object.getPrototypeOf(answers), null)
212 assert.isTrue(Object.hasOwn(answers, key))
213 assert.isTrue(Object.getOwnPropertyDescriptor(answers, key)?.enumerable)
214 assert.deepStrictEqual(Object.keys(answers), [key])
215 assert.deepStrictEqual(answers[key], { probability: 0.75 })
216 }).pipe(Effect.provide(succeedWith({ [key]: { _tag: "Probability", probability: 0.75 } })))
217 })
218
219 it.effect("preserves the own enumerable classification probability " + key, () => {
220 const definition = Decision.make({
221 input: Schema.String,
222 decisions: {
223 category: Decision.classify({
224 instructions: "Choose a category",
225 criteria: { [key]: "Special category", ordinary: "Ordinary category" }
226 })
227 }
228 })
229
230 return Effect.gen(function*() {
231 const { answers } = yield* DecisionModel.decide(definition, { input: "Help" })
232 const probabilities = answers.category.probabilities
233
234 assert.strictEqual(Object.getPrototypeOf(probabilities), null)
235 assert.isTrue(Object.hasOwn(probabilities, key))
236 assert.isTrue(Object.getOwnPropertyDescriptor(probabilities, key)?.enumerable)
237 assert.deepStrictEqual(Object.keys(probabilities), [key, "ordinary"])
238 assert.strictEqual(probabilities[key], 0.75)
239 assert.strictEqual(probabilities.ordinary, 0.25)
240 assert.strictEqual(answers.category.label, key)
241 }).pipe(Effect.provide(succeedWith({
242 category: { _tag: "Classify", label: key, probabilities: { [key]: 0.75, ordinary: 0.25 } }
243 })))
244 })
245 }
246
247 it.effect("round trips usage with undefined tokens through JSON", () =>
248 Effect.gen(function*() {
249 const usage = new DecisionModel.DecisionUsage({ inputTokens: undefined, outputTokens: undefined })
250
251 const encoded = yield* Schema.encodeEffect(DecisionModel.DecisionUsage)(usage)
252 const json = JSON.parse(JSON.stringify(encoded))
253 const decoded = yield* Schema.decodeUnknownEffect(DecisionModel.DecisionUsage)(json)
254
255 assert.deepStrictEqual(json, {}, "encoded JSON")
256 assert.deepStrictEqual(decoded, new DecisionModel.DecisionUsage({}), "decoded usage")
257 }))
258
259 it.effect("decide returns answers keyed by decision with usage", () =>
260 Effect.gen(function*() {
261 const { answers, usage } = yield* DecisionModel.decide(TicketTriage, { input: ticket })
262
263 assert.deepStrictEqual(Object.keys(answers).sort(), ["department", "frustration", "urgent"])
264
265 assert.strictEqual(answers.department.label, "billing")
266 assert.deepStrictEqual(answers.department.probabilities, { billing: 0.8, technical: 0.15, sales: 0.05 })
267 assert.strictEqual(answers.department.confidence, 0.8)
268
269 assert.strictEqual(answers.frustration.rating, 1.4)
270 assert.strictEqual(answers.frustration.label, "frustrated")
271 assert.deepStrictEqual(answers.frustration.probabilities, { calm: 0.1, frustrated: 0.5, angry: 0.4 })
272 assert.strictEqual(answers.frustration.confidence, 0.5)
273
274 assert.strictEqual(answers.urgent.probability, 0.9)
275 assert.isFalse("confidence" in answers.urgent)
276 assert.isFalse("probabilities" in answers.urgent)
277
278 assert.strictEqual(usage.inputTokens, 12)
279 assert.strictEqual(usage.outputTokens, undefined)
280 }).pipe(
281 Effect.provide(succeedWith(triageAnswers, { inputTokens: 12, outputTokens: undefined }))
282 ))
283
284 it.effect("classify and rate retain distributions when the provider omits confidence", () =>
285 Effect.gen(function*() {
286 const { answers } = yield* DecisionModel.decide(TicketTriage, { input: ticket })
287
288 assert.deepStrictEqual(answers.department, {
289 label: "billing",
290 probabilities: { billing: 0.8, technical: 0.15, sales: 0.05 }
291 })
292 assert.isFalse("confidence" in answers.department)
293
294 assert.deepStrictEqual(answers.frustration, {
295 rating: 1.4,
296 label: "frustrated",
297 probabilities: { calm: 0.1, frustrated: 0.5, angry: 0.4 }
298 })
299 assert.isFalse("confidence" in answers.frustration)
300 }).pipe(
301 Effect.provide(succeedWith({
302 department: {
303 _tag: "Classify",
304 label: "billing",
305 probabilities: { billing: 0.8, technical: 0.15, sales: 0.05 }
306 },
307 frustration: {
308 _tag: "Rate",
309 rating: 1.4,
310 probabilities: { calm: 0.1, frustrated: 0.5, angry: 0.4 }
311 },
312 urgent: triageAnswers.urgent
313 }))
314 ))
315
316 it.effect("the service exposes the same decide operation", () =>
317 Effect.gen(function*() {
318 const model = yield* DecisionModel.DecisionModel
319 const { answers } = yield* model.decide(TicketTriage, { input: ticket })
320
321 assert.strictEqual(answers.department.label, "billing")
322 assert.strictEqual(answers.urgent.probability, 0.9)
323 }).pipe(
324 Effect.provide(succeedWith(triageAnswers))
325 ))
326
327 it.effect("the provider receives the encoded input as state and every decision in one call", () => {
328 const calls: Array<DecisionModel.ProviderOptions> = []
329
330 return Effect.gen(function*() {
331 yield* DecisionModel.decide(TicketTriage, { input: ticket })
332
333 assert.strictEqual(calls.length, 1)
334 assert.deepStrictEqual(calls[0].state, { subject: "Card was charged twice", priority: "3" })
335 assert.strictEqual(calls[0].decisions, TicketTriage.decisions)
336 }).pipe(
337 Effect.provide(
338 makeLayer((options) => {
339 calls.push(options)
340 return Effect.succeed({
341 answers: triageAnswers,
342 usage: { inputTokens: undefined, outputTokens: undefined }
343 })
344 })
345 )
346 )
347 })
348
349 it.effect("a string input is passed to the provider as a string state", () => {
350 const states: Array<unknown> = []
351 const Sentiment = Decision.make({
352 input: Schema.String,
353 decisions: {
354 tone: Decision.classify({
355 instructions: "Tone of the message",
356 criteria: { positive: "happy", negative: "unhappy" }
357 })
358 }
359 })
360
361 return Effect.gen(function*() {
362 const { answers } = yield* DecisionModel.decide(Sentiment, { input: "I love this" })
363
364 assert.deepStrictEqual(states, ["I love this"])
365 assert.strictEqual(answers.tone.label, "positive")
366 }).pipe(
367 Effect.provide(
368 makeLayer(({ state }) => {
369 states.push(state)
370 return Effect.succeed({
371 answers: {
372 tone: {
373 _tag: "Classify" as const,
374 label: "positive",
375 probabilities: { positive: 0.95, negative: 0.05 },
376 confidence: 0.95
377 }
378 },
379 usage: { inputTokens: undefined, outputTokens: undefined }
380 })
381 })
382 )
383 )
384 })
385
386 it.effect("derives JSON codecs for nested input before calling the provider", () => {
387 const states: Array<unknown> = []
388 const definition = Decision.make({
389 input: Schema.Struct({
390 amount: Schema.BigInt,
391 createdAt: Schema.Date,
392 priority: Schema.FiniteFromString,
393 values: Schema.Array(Schema.BigInt)
394 }),
395 decisions: TicketTriage.decisions
396 })
397
398 return Effect.gen(function*() {
399 yield* DecisionModel.decide(definition, {
400 input: { amount: 42n, createdAt: new Date("2026-01-01T00:00:00.000Z"), priority: 3, values: [1n, 2n] }
401 })
402
403 assert.deepStrictEqual(states, [{
404 amount: "42",
405 createdAt: "2026-01-01T00:00:00.000Z",
406 priority: "3",
407 values: ["1", "2"]
408 }])
409 }).pipe(Effect.provide(makeLayer(({ state }) => {
410 states.push(state)
411 return Effect.succeed({ answers: triageAnswers, usage: { inputTokens: undefined, outputTokens: undefined } })
412 })))
413 })
414
415 it.effect("JSON encoding distinguishes absent optional fields from explicit undefined", () => {
416 const states: Array<unknown> = []
417 const definition = Decision.make({
418 input: Schema.Struct({ note: Schema.optional(Schema.String) }),
419 decisions: TicketTriage.decisions
420 })
421
422 return Effect.gen(function*() {
423 yield* DecisionModel.decide(definition, { input: {} })
424 yield* DecisionModel.decide(definition, { input: { note: undefined } })
425
426 assert.deepStrictEqual(states, [{}, { note: null }])
427 }).pipe(Effect.provide(makeLayer(({ state }) => {
428 states.push(state)
429 return Effect.succeed({ answers: triageAnswers, usage: { inputTokens: undefined, outputTokens: undefined } })
430 })))
431 })
432
433 it.effect("JSON codec encoding failures become InvalidUserInputError before the provider runs", () => {
434 let calls = 0
435 const definition = Decision.make({
436 input: Schema.declare<Date>((value): value is Date => value instanceof Date),
437 decisions: TicketTriage.decisions
438 })
439
440 return Effect.gen(function*() {
441 const error = yield* failureOf(DecisionModel.decide(definition, { input: new Date("2026-01-01") }))
442
443 assert.strictEqual(calls, 0)
444 assert.isTrue(AiError.isAiError(error))
445 assert.strictEqual(error?.reason._tag, "InvalidUserInputError")
446 }).pipe(Effect.provide(makeLayer(() => {
447 calls++
448 return Effect.succeed({ answers: triageAnswers, usage: { inputTokens: undefined, outputTokens: undefined } })
449 })))
450 })
451
452 it.effect("input encoding services are resolved from the environment", () => {
453 const states: Array<unknown> = []
454 const Redacted = Decision.make({
455 input: Schema.Struct({ body: RedactedString }),
456 decisions: {
457 urgent: Decision.probability({
458 instructions: "Needs action now",
459 criteria: { false: "No", true: "Yes" }
460 })
461 }
462 })
463
464 return Effect.gen(function*() {
465 yield* DecisionModel.decide(Redacted, { input: { body: "call me at 555-0100" } })
466
467 assert.deepStrictEqual(states, [{ body: "call me at [redacted]" }])
468 }).pipe(
469 Effect.provide(
470 makeLayer(({ state }) => {
471 states.push(state)
472 return Effect.succeed({
473 answers: { urgent: { _tag: "Probability" as const, probability: 0.5 } },
474 usage: { inputTokens: undefined, outputTokens: undefined }
475 })
476 })
477 ),
478 Effect.provideService(Redactor, {
479 redact: (value) => value.replace(/\d{3}-\d{4}/g, "[redacted]")
480 })
481 )
482 })
483
484 it.effect("input encoding failures surface as AiError", () => {
485 let calls = 0
486 const Strict = Decision.make({
487 input: Schema.String.check(Schema.isMinLength(3)),
488 decisions: {
489 urgent: Decision.probability({
490 instructions: "Needs action now",
491 criteria: { false: "No", true: "Yes" }
492 })
493 }
494 })
495
496 return Effect.gen(function*() {
497 const error = yield* failureOf(DecisionModel.decide(Strict, { input: "hi" }))
498
499 assert.strictEqual(calls, 0)
500 assert.isTrue(AiError.isAiError(error))
501 assert.strictEqual(error?.reason._tag, "InvalidUserInputError")
502 }).pipe(
503 Effect.provide(
504 makeLayer(() => {
505 calls++
506 return Effect.die("provider should not be called")
507 })
508 )
509 )
510 })
511
512 it.effect("provider AiError propagates through decide", () => {
513 const error = AiError.make({
514 module: "DecisionModelTest",
515 method: "decide",
516 reason: new AiError.UnknownError({ description: "boom" })
517 })
518
519 return Effect.gen(function*() {
520 const result = yield* failureOf(DecisionModel.decide(TicketTriage, { input: ticket }))
521
522 assert.strictEqual(result, error)
523 }).pipe(
524 Effect.provide(makeLayer(() => Effect.fail(error)))
525 )
526 })
527
528 it.effect("decide fails with InvalidOutputError when an answer is missing", () =>
529 Effect.gen(function*() {
530 const error = yield* failureOf(DecisionModel.decide(TicketTriage, { input: ticket }))
531
532 assert.strictEqual(error?.reason._tag, "InvalidOutputError")
533 }).pipe(
534 Effect.provide(succeedWith({
535 department: triageAnswers.department,
536 frustration: triageAnswers.frustration
537 }))
538 ))
539
540 it.effect("decide fails with InvalidOutputError when a classify label is not a criteria key", () =>
541 Effect.gen(function*() {
542 const error = yield* failureOf(DecisionModel.decide(TicketTriage, { input: ticket }))
543
544 assert.strictEqual(error?.reason._tag, "InvalidOutputError")
545 }).pipe(
546 Effect.provide(succeedWith({
547 ...triageAnswers,
548 department: { ...triageAnswers.department, label: "legal" }
549 }))
550 ))
551
552 it.effect("decide fails with InvalidOutputError when a classify distribution is incomplete", () =>
553 Effect.gen(function*() {
554 const error = yield* failureOf(DecisionModel.decide(TicketTriage, { input: ticket }))
555
556 assert.strictEqual(error?.reason._tag, "InvalidOutputError")
557 }).pipe(
558 Effect.provide(succeedWith({
559 ...triageAnswers,
560 department: { ...triageAnswers.department, probabilities: { billing: 1 } }
561 }))
562 ))
563
564 it.effect("decide fails with InvalidOutputError when a rate distribution is incomplete", () =>
565 Effect.gen(function*() {
566 const error = yield* failureOf(DecisionModel.decide(TicketTriage, { input: ticket }))
567
568 assert.strictEqual(error?.reason._tag, "InvalidOutputError")
569 }).pipe(
570 Effect.provide(succeedWith({
571 ...triageAnswers,
572 frustration: { ...triageAnswers.frustration, probabilities: { calm: 0.5, angry: 0.5 } }
573 }))
574 ))
575
576 it.effect("decide fails with InvalidOutputError when a probability is outside [0, 1]", () =>
577 Effect.gen(function*() {
578 const error = yield* failureOf(DecisionModel.decide(TicketTriage, { input: ticket }))
579
580 assert.strictEqual(error?.reason._tag, "InvalidOutputError")
581 }).pipe(
582 Effect.provide(succeedWith({
583 ...triageAnswers,
584 urgent: { _tag: "Probability" as const, probability: 1.5 }
585 }))
586 ))
587
588 it.effect("Model.make wraps a DecisionModel layer with provider metadata", () =>
589 Effect.gen(function*() {
590 const provider = yield* Model.ProviderName
591 const modelName = yield* Model.ModelName
592 const { answers } = yield* DecisionModel.decide(TicketTriage, { input: ticket })
593
594 assert.strictEqual(provider, "fake")
595 assert.strictEqual(modelName, "fake-decisions")
596 assert.strictEqual(answers.department.label, "billing")
597 }).pipe(
598 Effect.provide(Model.make("fake", "fake-decisions", succeedWith(triageAnswers)))
599 ))
600})
601
602describe("Decision validation contracts", () => {
603 for (const criteria of [{}, { only: "Only label" }] as Array<Record<string, string>>) {
604 it(`classify rejects ${Object.keys(criteria).length} labels`, () => {
605 assert.throws(() => Decision.classify({ instructions: "Choose", criteria }))
606 })
607 }
608
609 it("rate rejects duplicate levels", () => {
610 assert.throws(() => Decision.rate({ instructions: "Rate", criteria: ["low", "high", "low"] }))
611 })
612
613 it.effect("rate derives the argmax label without a provider label", () =>
614 Effect.gen(function*() {
615 // Exercise untrusted provider output; the positive typetest pins the provider type separately.
616 const { label: _, ...frustration } = triageAnswers.frustration
617 const { answers } = yield* DecisionModel.decide(TicketTriage, { input: ticket }).pipe(
618 Effect.provide(
619 succeedWith({ ...triageAnswers, frustration } as unknown as DecisionModel.ProviderResponse["answers"])
620 )
621 )
622 assert.strictEqual(answers.frustration.label, "frustrated")
623 }))
624
625 for (
626 const [name, probabilities, expected] of [
627 ["ignores a conflicting provider label", { calm: 0.1, frustrated: 0.5, angry: 0.4 }, "frustrated"],
628 // Deliberately reverse insertion order: ties follow criteria, not provider key order.
629 ["breaks ties in criteria order", { angry: 0.5, frustrated: 0.5, calm: 0 }, "frustrated"]
630 ] as const
631 ) {
632 it.effect(`rate ${name}`, () =>
633 Effect.gen(function*() {
634 const { answers } = yield* DecisionModel.decide(TicketTriage, { input: ticket })
635 assert.strictEqual(answers.frustration.label, expected)
636 }).pipe(Effect.provide(succeedWith(
637 {
638 ...triageAnswers,
639 frustration: { ...triageAnswers.frustration, label: "angry", probabilities }
640 } as unknown as DecisionModel.ProviderResponse["answers"]
641 ))))
642 }
643
644 it.effect("classify retains the provider label even when it is not the argmax", () =>
645 Effect.gen(function*() {
646 const { answers } = yield* DecisionModel.decide(TicketTriage, { input: ticket })
647 assert.strictEqual(answers.department.label, "sales")
648 }).pipe(Effect.provide(succeedWith({
649 ...triageAnswers,
650 department: { ...triageAnswers.department, label: "sales" }
651 }))))
652
653 for (const key of ["department", "frustration"] as const) {
654 for (const confidence of [-Number.EPSILON, 1 + Number.EPSILON, NaN, Infinity, -Infinity]) {
655 it.effect(`${key} rejects confidence ${confidence}`, () =>
656 Effect.gen(function*() {
657 const error = yield* failureOf(DecisionModel.decide(TicketTriage, { input: ticket }))
658 assert.strictEqual(error?.reason._tag, "InvalidOutputError")
659 }).pipe(Effect.provide(succeedWith({
660 ...triageAnswers,
661 [key]: { ...triageAnswers[key], confidence }
662 }))))
663 }
664 for (const confidence of [0, 1]) {
665 it.effect(`${key} accepts confidence boundary ${confidence}`, () =>
666 Effect.gen(function*() {
667 const { answers } = yield* DecisionModel.decide(TicketTriage, { input: ticket })
668 assert.strictEqual(answers[key].confidence, confidence)
669 }).pipe(Effect.provide(succeedWith({
670 ...triageAnswers,
671 [key]: { ...triageAnswers[key], confidence }
672 }))))
673 }
674
675 for (
676 const [total, accepted] of [
677 [1, true],
678 [1 - 0.5e-6, true],
679 [1 + 0.5e-6, true],
680 [1 + 1e-6, true],
681 // Adjacent representable totals straddle the lower tolerance boundary.
682 [0.9999990000000001, true],
683 [0.9999989999999999, false],
684 [1 + 1e-6 + Number.EPSILON, false],
685 [0.99, false],
686 [1.01, false],
687 [0, false]
688 ] as const
689 ) {
690 it.effect(`${key} ${accepted ? "accepts" : "rejects"} distribution total ${total}`, () => {
691 const probabilities = key === "department"
692 ? { billing: total / 2, technical: total / 2, sales: 0 }
693 : { calm: total / 2, frustrated: total / 2, angry: 0 }
694 return Effect.gen(function*() {
695 const result = yield* DecisionModel.decide(TicketTriage, { input: ticket }).pipe(
696 Effect.match({ onFailure: (error) => error, onSuccess: (response) => response })
697 )
698 if (accepted) {
699 assert.isFalse(AiError.isAiError(result))
700 if (!AiError.isAiError(result)) {
701 assert.deepStrictEqual(result.answers[key].probabilities, probabilities)
702 }
703 } else {
704 assert.isTrue(AiError.isAiError(result))
705 if (AiError.isAiError(result)) {
706 assert.strictEqual(result.reason._tag, "InvalidOutputError")
707 }
708 }
709 }).pipe(Effect.provide(succeedWith({
710 ...triageAnswers,
711 [key]: { ...triageAnswers[key], probabilities }
712 })))
713 })
714 }
715 }
716
717 for (const rating of [-Number.EPSILON, 2 + 2 * Number.EPSILON, NaN, Infinity, -Infinity]) {
718 it.effect(`rate rejects rating ${rating}`, () =>
719 Effect.gen(function*() {
720 const error = yield* failureOf(DecisionModel.decide(TicketTriage, { input: ticket }))
721 assert.strictEqual(error?.reason._tag, "InvalidOutputError")
722 }).pipe(Effect.provide(succeedWith({
723 ...triageAnswers,
724 frustration: { ...triageAnswers.frustration, rating }
725 }))))
726 }
727 for (const rating of [0, 1.4, 2]) {
728 it.effect(`rate accepts rating ${rating}`, () =>
729 Effect.gen(function*() {
730 const { answers } = yield* DecisionModel.decide(TicketTriage, { input: ticket })
731 assert.strictEqual(answers.frustration.rating, rating)
732 }).pipe(Effect.provide(succeedWith({
733 ...triageAnswers,
734 frustration: { ...triageAnswers.frustration, rating }
735 }))))
736 }
737
738 it.effect("extra provider keys never leak into answers", () => {
739 const raw = {
740 ...triageAnswers,
741 extraDecision: { _tag: "Probability" as const, probability: 0.5 },
742 department: {
743 ...triageAnswers.department,
744 extra: "discard",
745 probabilities: { ...triageAnswers.department.probabilities, extra: 1 }
746 },
747 frustration: {
748 ...triageAnswers.frustration,
749 extra: "discard",
750 probabilities: { ...triageAnswers.frustration.probabilities, extra: 1 }
751 },
752 urgent: { ...triageAnswers.urgent, confidence: 1, probabilities: { false: 0.1, true: 0.9 }, extra: "discard" }
753 }
754 return Effect.gen(function*() {
755 const { answers } = yield* DecisionModel.decide(TicketTriage, { input: ticket })
756 assert.deepStrictEqual(answers, expectedAnswers)
757 }).pipe(Effect.provide(succeedWith(raw)))
758 })
759})