refactor(api): centralize service-tier primitives (Zoo-Code-Org#1040)

* refactor(api): centralize service-tier primitives

* test(openai-native): cover omitted completion tiers

* test(openai-native): cover resolved streaming tiers

* test(api): cover service tier fallbacks

* test(api): cover remaining service tier branches

* refactor(api): remove duplicate tier capture

* test(openai-native): cover flex service tier

* test(openai-native): expand service tier coverage

* refactor: address service tier review feedback

* refactor(api): address service tier review feedback

* test(webview): add model info visual snapshot

* fix(webview): isolate visual test dependencies

* test(webview): update service tier visual baseline

* fix(webview): add @source directive so Tailwind utilities generate in CT builds

---------

Co-authored-by: Elliott de Launay <edelauna@gmail.com>

Author: WebMad

packages/types/package.json

@@ -11,6 +11,14 @@
 				"types": "./dist/index.d.cts",
 				"default": "./dist/index.cjs"
 			}
+		},
+		"./model": {
+			"types": "./src/model.ts",
+			"import": "./src/model.ts"
+		},
+		"./provider-identifiers": {
+			"types": "./src/provider-identifiers.ts",
+			"import": "./src/provider-identifiers.ts"
 		}
 	},
 	"scripts": {

packages/types/src/model.ts

@@ -54,10 +54,19 @@ export const verbosityLevelsSchema = z.enum(verbosityLevels)
 
 export type VerbosityLevel = z.infer<typeof verbosityLevelsSchema>
 
+/** Serialized service tier field used in provider request payloads and responses. */
+export const SERVICE_TIER_KEY = "service_tier"
+
 /**
- * Service tiers (OpenAI Responses API)
+ * Service tiers for the public OpenAI Responses API.
  */
-export const serviceTiers = ["default", "flex", "priority"] as const
+export const OpenAiServiceTier = {
+	Default: "default",
+	Flex: "flex",
+	Priority: "priority",
+} as const
+
+export const serviceTiers = [OpenAiServiceTier.Default, OpenAiServiceTier.Flex, OpenAiServiceTier.Priority] as const
 export const serviceTierSchema = z.enum(serviceTiers)
 export type ServiceTier = z.infer<typeof serviceTierSchema>
 

src/api/providers/__tests__/bedrock.spec.ts

@@ -58,6 +58,7 @@ import {
 	BEDROCK_1M_CONTEXT_MODEL_IDS,
 	BEDROCK_SERVICE_TIER_MODEL_IDS,
 	bedrockModels,
+	SERVICE_TIER_KEY,
 	ApiProviderError,
 } from "@roo-code/types"
 
@@ -1233,10 +1234,10 @@ describe("AwsBedrockHandler", () => {
 				const commandArg = mockConverseStreamCommand.mock.calls[0][0] as any
 
 				// service_tier should be at the top level of the payload
-				expect(commandArg.service_tier).toBe("PRIORITY")
+				expect(commandArg[SERVICE_TIER_KEY]).toBe("PRIORITY")
 				// service_tier should NOT be in additionalModelRequestFields
 				if (commandArg.additionalModelRequestFields) {
-					expect(commandArg.additionalModelRequestFields.service_tier).toBeUndefined()
+					expect(commandArg.additionalModelRequestFields[SERVICE_TIER_KEY]).toBeUndefined()
 				}
 			})
 
@@ -1263,10 +1264,10 @@ describe("AwsBedrockHandler", () => {
 				const commandArg = mockConverseStreamCommand.mock.calls[0][0] as any
 
 				// service_tier should be at the top level of the payload
-				expect(commandArg.service_tier).toBe("FLEX")
+				expect(commandArg[SERVICE_TIER_KEY]).toBe("FLEX")
 				// service_tier should NOT be in additionalModelRequestFields
 				if (commandArg.additionalModelRequestFields) {
-					expect(commandArg.additionalModelRequestFields.service_tier).toBeUndefined()
+					expect(commandArg.additionalModelRequestFields[SERVICE_TIER_KEY]).toBeUndefined()
 				}
 			})
 
@@ -1294,9 +1295,9 @@ describe("AwsBedrockHandler", () => {
 				const commandArg = mockConverseStreamCommand.mock.calls[0][0] as any
 
 				// Service tier should NOT be included for unsupported models (at top level or in additionalModelRequestFields)
-				expect(commandArg.service_tier).toBeUndefined()
+				expect(commandArg[SERVICE_TIER_KEY]).toBeUndefined()
 				if (commandArg.additionalModelRequestFields) {
-					expect(commandArg.additionalModelRequestFields.service_tier).toBeUndefined()
+					expect(commandArg.additionalModelRequestFields[SERVICE_TIER_KEY]).toBeUndefined()
 				}
 			})
 
@@ -1323,9 +1324,9 @@ describe("AwsBedrockHandler", () => {
 				const commandArg = mockConverseStreamCommand.mock.calls[0][0] as any
 
 				// Service tier should NOT be included when not specified (at top level or in additionalModelRequestFields)
-				expect(commandArg.service_tier).toBeUndefined()
+				expect(commandArg[SERVICE_TIER_KEY]).toBeUndefined()
 				if (commandArg.additionalModelRequestFields) {
-					expect(commandArg.additionalModelRequestFields.service_tier).toBeUndefined()
+					expect(commandArg.additionalModelRequestFields[SERVICE_TIER_KEY]).toBeUndefined()
 				}
 			})
 		})

src/api/providers/__tests__/openai-native-usage.spec.ts

@@ -1,6 +1,6 @@
 import { describe, it, expect, beforeEach } from "vitest"
 import { OpenAiNativeHandler } from "../openai-native"
-import { openAiNativeModels } from "@roo-code/types"
+import { OpenAiServiceTier, openAiNativeModels } from "@roo-code/types"
 
 describe("OpenAiNativeHandler - normalizeUsage", () => {
 	let handler: OpenAiNativeHandler
@@ -468,7 +468,7 @@ describe("OpenAiNativeHandler - normalizeUsage", () => {
 		it("should not apply GPT-5.4 long-context pricing to priority tier", () => {
 			handler = new OpenAiNativeHandler({
 				openAiNativeApiKey: "test-key",
-				openAiNativeServiceTier: "priority",
+				openAiNativeServiceTier: OpenAiServiceTier.Priority,
 			})
 
 			const usage = {