feat: remove OpenRouter Transforms feature

packages/types/src/global-settings.ts

@@ -291,7 +291,6 @@ export const isGlobalStateKey = (key: string): key is Keys<GlobalState> =>
 // Default settings when running evals (unless overridden).
 export const EVALS_SETTINGS: RooCodeSettings = {
 	apiProvider: "openrouter",
-	openRouterUseMiddleOutTransform: false,
 
 	lastShownAnnouncementId: "jul-09-2025-3-23-0",
 

packages/types/src/provider-settings.ts

@@ -207,7 +207,6 @@ const openRouterSchema = baseProviderSettingsSchema.extend({
 	openRouterModelId: z.string().optional(),
 	openRouterBaseUrl: z.string().optional(),
 	openRouterSpecificProvider: z.string().optional(),
-	openRouterUseMiddleOutTransform: z.boolean().optional(),
 })
 
 const bedrockSchema = apiModelIdProviderModelSchema.extend({

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

@@ -268,38 +268,11 @@ describe("OpenRouterHandler", () => {
 					stream_options: { include_usage: true },
 					temperature: 0,
 					top_p: undefined,
-					transforms: ["middle-out"],
 				}),
 				{ headers: { "x-anthropic-beta": "fine-grained-tool-streaming-2025-05-14" } },
 			)
 		})
 
-		it("supports the middle-out transform", async () => {
-			const handler = new OpenRouterHandler({
-				...mockOptions,
-				openRouterUseMiddleOutTransform: true,
-			})
-			const mockStream = {
-				async *[Symbol.asyncIterator]() {
-					yield {
-						id: "test-id",
-						choices: [{ delta: { content: "test response" } }],
-					}
-				},
-			}
-
-			const mockCreate = vitest.fn().mockResolvedValue(mockStream)
-			;(OpenAI as any).prototype.chat = {
-				completions: { create: mockCreate },
-			} as any
-
-			await handler.createMessage("test", []).next()
-
-			expect(mockCreate).toHaveBeenCalledWith(expect.objectContaining({ transforms: ["middle-out"] }), {
-				headers: { "x-anthropic-beta": "fine-grained-tool-streaming-2025-05-14" },
-			})
-		})
-
 		it("adds cache control for supported models", async () => {
 			const handler = new OpenRouterHandler({
 				...mockOptions,

src/api/providers/openrouter.ts

@@ -293,8 +293,6 @@ export class OpenRouterHandler extends BaseProvider implements SingleCompletionH
 			}
 		}
 
-		const transforms = (this.options.openRouterUseMiddleOutTransform ?? true) ? ["middle-out"] : undefined
-
 		// https://openrouter.ai/docs/transforms
 		const completionParams: OpenRouterChatCompletionParams = {
 			model: modelId,
@@ -313,7 +311,6 @@ export class OpenRouterHandler extends BaseProvider implements SingleCompletionH
 						allow_fallbacks: false,
 					},
 				}),
-			...(transforms && { transforms }),
 			...(reasoning && { reasoning }),
 			...(metadata?.tools && { tools: this.convertToolsForOpenAI(metadata.tools) }),
 			...(metadata?.tool_choice && { tool_choice: metadata.tool_choice }),

src/core/webview/ClineProvider.ts

@@ -1896,7 +1896,6 @@ export class ClineProvider
 			imageGenerationProvider,
 			openRouterImageApiKey,
 			openRouterImageGenerationSelectedModel,
-			openRouterUseMiddleOutTransform,
 			featureRoomoteControlEnabled,
 			isBrowserSessionActive,
 		} = await this.getState()
@@ -2067,7 +2066,6 @@ export class ClineProvider
 			imageGenerationProvider,
 			openRouterImageApiKey,
 			openRouterImageGenerationSelectedModel,
-			openRouterUseMiddleOutTransform,
 			featureRoomoteControlEnabled,
 			claudeCodeIsAuthenticated: await (async () => {
 				try {
@@ -2259,7 +2257,6 @@ export class ClineProvider
 			customModes,
 			maxOpenTabsContext: stateValues.maxOpenTabsContext ?? 20,
 			maxWorkspaceFiles: stateValues.maxWorkspaceFiles ?? 200,
-			openRouterUseMiddleOutTransform: stateValues.openRouterUseMiddleOutTransform,
 			browserToolEnabled: stateValues.browserToolEnabled ?? true,
 			telemetrySetting: stateValues.telemetrySetting || "unset",
 			showRooIgnoredFiles: stateValues.showRooIgnoredFiles ?? false,

src/shared/ExtensionMessage.ts

@@ -352,7 +352,6 @@ export type ExtensionState = Pick<
 	profileThresholds: Record<string, number>
 	hasOpenedModeSelector: boolean
 	openRouterImageApiKey?: string
-	openRouterUseMiddleOutTransform?: boolean
 	messageQueue?: QueuedMessage[]
 	lastShownAnnouncementId?: string
 	apiModelId?: string

webview-ui/src/components/settings/providers/OpenRouter.tsx

@@ -1,5 +1,4 @@
 import { useCallback, useState } from "react"
-import { Trans } from "react-i18next"
 import { Checkbox } from "vscrui"
 import { VSCodeTextField } from "@vscode/webview-ui-toolkit/react"
 
@@ -11,7 +10,7 @@ import { useAppTranslation } from "@src/i18n/TranslationContext"
 import { getOpenRouterAuthUrl } from "@src/oauth/urls"
 import { VSCodeButtonLink } from "@src/components/common/VSCodeButtonLink"
 
-import { inputEventTransform, noTransform } from "../transforms"
+import { inputEventTransform } from "../transforms"
 
 import { ModelPicker } from "../ModelPicker"
 import { OpenRouterBalanceDisplay } from "./OpenRouterBalanceDisplay"
@@ -78,40 +77,28 @@ export const OpenRouter = ({
 				</VSCodeButtonLink>
 			)}
 			{!simplifySettings && (
-				<>
-					<div>
-						<Checkbox
-							checked={openRouterBaseUrlSelected}
-							onChange={(checked: boolean) => {
-								setOpenRouterBaseUrlSelected(checked)
-
-								if (!checked) {
-									setApiConfigurationField("openRouterBaseUrl", "")
-								}
-							}}>
-							{t("settings:providers.useCustomBaseUrl")}
-						</Checkbox>
-						{openRouterBaseUrlSelected && (
-							<VSCodeTextField
-								value={apiConfiguration?.openRouterBaseUrl || ""}
-								type="url"
-								onInput={handleInputChange("openRouterBaseUrl")}
-								placeholder="Default: https://openrouter.ai/api/v1"
-								className="w-full mt-1"
-							/>
-						)}
-					</div>
+				<div>
 					<Checkbox
-						checked={apiConfiguration?.openRouterUseMiddleOutTransform ?? true}
-						onChange={handleInputChange("openRouterUseMiddleOutTransform", noTransform)}>
-						<Trans
-							i18nKey="settings:providers.openRouterTransformsText"
-							components={{
-								a: <a href="https://openrouter.ai/docs/transforms" />,
-							}}
-						/>
+						checked={openRouterBaseUrlSelected}
+						onChange={(checked: boolean) => {
+							setOpenRouterBaseUrlSelected(checked)
+
+							if (!checked) {
+								setApiConfigurationField("openRouterBaseUrl", "")
+							}
+						}}>
+						{t("settings:providers.useCustomBaseUrl")}
 					</Checkbox>
-				</>
+					{openRouterBaseUrlSelected && (
+						<VSCodeTextField
+							value={apiConfiguration?.openRouterBaseUrl || ""}
+							type="url"
+							onInput={handleInputChange("openRouterBaseUrl")}
+							placeholder="Default: https://openrouter.ai/api/v1"
+							className="w-full mt-1"
+						/>
+					)}
+				</div>
 			)}
 			<ModelPicker
 				apiConfiguration={apiConfiguration}

webview-ui/src/i18n/locales/en/settings.json

@@ -303,7 +303,6 @@
 		"getRequestyApiKey": "Create new Requesty API Key",
 		"getRequestyBaseUrl": "Base URL",
 		"requestyUseCustomBaseUrl": "Use custom base URL",
-		"openRouterTransformsText": "Compress prompts and message chains to the context size (<a>OpenRouter Transforms</a>)",
 		"anthropicApiKey": "Anthropic API Key",
 		"getAnthropicApiKey": "Get Anthropic API Key",
 		"anthropicUseAuthToken": "Pass Anthropic API Key as Authorization header instead of X-Api-Key",