CLI: isolate provider model id transforms from shared mocks

src/cli/provider-model-id-transform.test.ts

@@ -1,6 +1,7 @@
 import { describe, expect, test } from "bun:test"
 
 import { transformModelForProvider } from "./provider-model-id-transform"
+import { transformModelForProvider as transformSharedModelForProvider } from "../shared/provider-model-id-transform"
 
 describe("transformModelForProvider", () => {
   describe("github-copilot provider", () => {
@@ -336,4 +337,15 @@ describe("transformModelForProvider", () => {
       expect(result).toBe("gemini-3-flash")
     })
   })
+
+  test("uses a CLI-local transform implementation", () => {
+    // #given
+    const cliResult = transformModelForProvider("anthropic", "claude-opus-4-6")
+    const sharedResult = transformSharedModelForProvider("anthropic", "claude-opus-4-6")
+
+    // #when
+    expect(transformModelForProvider).not.toBe(transformSharedModelForProvider)
+    expect(cliResult).toBe("claude-opus-4.6")
+    expect(sharedResult).toBe("claude-opus-4.6")
+  })
 })

src/cli/provider-model-id-transform.ts

@@ -1 +1,61 @@
-export { transformModelForProvider } from "../shared/provider-model-id-transform"
+function inferSubProvider(model: string): string | undefined {
+  if (model.startsWith("claude-")) return "anthropic"
+  if (model.startsWith("gpt-")) return "openai"
+  if (model.startsWith("gemini-")) return "google"
+  if (model.startsWith("grok-")) return "xai"
+  if (model.startsWith("minimax-")) return "minimax"
+  if (model.startsWith("kimi-")) return "moonshotai"
+  if (model.startsWith("glm-")) return "zai"
+  return undefined
+}
+
+const CLAUDE_VERSION_DOT = /claude-(\w+)-(\d+)-(\d+)/g
+const GEMINI_31_PRO_PREVIEW = /gemini-3\.1-pro(?!-)/g
+const GEMINI_3_FLASH_PREVIEW = /gemini-3-flash(?!-)/g
+
+function claudeVersionDot(model: string): string {
+  return model.replace(CLAUDE_VERSION_DOT, "claude-$1-$2.$3")
+}
+
+function applyGatewayTransforms(model: string): string {
+  return claudeVersionDot(model).replace(
+    GEMINI_31_PRO_PREVIEW,
+    "gemini-3.1-pro-preview",
+  )
+}
+
+export function transformModelForProvider(provider: string, model: string): string {
+  if (provider === "vercel") {
+    const slashIndex = model.indexOf("/")
+    if (slashIndex !== -1) {
+      const subProvider = model.substring(0, slashIndex)
+      const subModel = model.substring(slashIndex + 1)
+      return `${subProvider}/${applyGatewayTransforms(subModel)}`
+    }
+
+    const subProvider = inferSubProvider(model)
+    if (subProvider) {
+      return `${subProvider}/${applyGatewayTransforms(model)}`
+    }
+
+    return model
+  }
+
+  if (provider === "github-copilot") {
+    return claudeVersionDot(model)
+      .replace(GEMINI_31_PRO_PREVIEW, "gemini-3.1-pro-preview")
+      .replace(GEMINI_3_FLASH_PREVIEW, "gemini-3-flash-preview")
+  }
+
+  if (provider === "google") {
+    return model
+      .replace(GEMINI_31_PRO_PREVIEW, "gemini-3.1-pro-preview")
+      .replace(GEMINI_3_FLASH_PREVIEW, "gemini-3-flash-preview")
+  }
+
+  if (provider === "anthropic") {
+    return claudeVersionDot(model)
+  }
+
+  return model
+}