fix(config): avoid Anthropic startup crash

src/agents/model-selection.test.ts

@@ -121,6 +121,12 @@ describe("model-selection", () => {
         defaultProvider: "anthropic",
         expected: { provider: "anthropic", model: "claude-sonnet-4-6" },
       },
+      {
+        name: "keeps dated anthropic model ids unchanged",
+        variants: ["anthropic/claude-sonnet-4-20250514", "claude-sonnet-4-20250514"],
+        defaultProvider: "anthropic",
+        expected: { provider: "anthropic", model: "claude-sonnet-4-20250514" },
+      },
       {
         name: "normalizes deprecated google flash preview ids",
         variants: ["google/gemini-3.1-flash-preview", "gemini-3.1-flash-preview"],

src/agents/model-selection.ts

@@ -31,13 +31,6 @@ export type ModelAliasIndex = {
   byKey: Map<string, string[]>;
 };
 
-const ANTHROPIC_MODEL_ALIASES: Record<string, string> = {
-  "opus-4.6": "claude-opus-4-6",
-  "opus-4.5": "claude-opus-4-5",
-  "sonnet-4.6": "claude-sonnet-4-6",
-  "sonnet-4.5": "claude-sonnet-4-5",
-};
-
 function normalizeAliasKey(value: string): string {
   return value.trim().toLowerCase();
 }
@@ -151,7 +144,20 @@ function normalizeAnthropicModelId(model: string): string {
     return trimmed;
   }
   const lower = trimmed.toLowerCase();
-  return ANTHROPIC_MODEL_ALIASES[lower] ?? trimmed;
+  // Keep alias resolution local so bundled startup paths cannot trip a TDZ on
+  // a module-level alias table while config parsing is still initializing.
+  switch (lower) {
+    case "opus-4.6":
+      return "claude-opus-4-6";
+    case "opus-4.5":
+      return "claude-opus-4-5";
+    case "sonnet-4.6":
+      return "claude-sonnet-4-6";
+    case "sonnet-4.5":
+      return "claude-sonnet-4-5";
+    default:
+      return trimmed;
+  }
 }
 
 function normalizeProviderModelId(provider: string, model: string): string {

src/config/config.pruning-defaults.test.ts

@@ -73,6 +73,30 @@ describe("config pruning defaults", () => {
     });
   });
 
+  it("adds cacheRetention defaults for dated Anthropic primary model refs", async () => {
+    await withTempHome(async (home) => {
+      await writeConfigForTest(home, {
+        auth: {
+          profiles: {
+            "anthropic:api": { provider: "anthropic", mode: "api_key" },
+          },
+        },
+        agents: {
+          defaults: {
+            model: { primary: "anthropic/claude-sonnet-4-20250514" },
+          },
+        },
+      });
+
+      const cfg = loadConfig();
+
+      expect(
+        cfg.agents?.defaults?.models?.["anthropic/claude-sonnet-4-20250514"]?.params
+          ?.cacheRetention,
+      ).toBe("short");
+    });
+  });
+
   it("adds default cacheRetention for Anthropic Claude models on Bedrock", async () => {
     await withTempHome(async (home) => {
       await writeConfigForTest(home, {