fix(eval): lowercase 'builtin' in list --type filter

Author: jariy17

README.md

@@ -143,7 +143,7 @@ agentcore eval evaluator code-based create \
   --lambda-arn arn:aws:lambda:us-west-2:123456789012:function:refund-policy \
   --json
 
-# Get, list, delete. --type filters the returned page (Builtin | code-based | llm-as-a-judge).
+# Get, list, delete. --type filters the returned page (builtin | code-based | llm-as-a-judge).
 agentcore eval evaluator get --id <evaluatorId> --json
 agentcore eval evaluator list --type llm-as-a-judge --max-results 20 --json
 agentcore eval evaluator delete --id <evaluatorId> --yes --json

src/handlers/eval/evaluator/evaluator.test.tsx

@@ -320,7 +320,7 @@ describe("list filtering", () => {
   ] as unknown as EvaluatorSummary[];
 
   test.each([
-    ["Builtin", ["b1"]],
+    ["builtin", ["b1"]],
     ["code-based", ["c1"]],
     ["llm-as-a-judge", ["l1"]],
   ] as const)("filters the returned page by --type %s", async (type, expectedIds) => {

src/handlers/eval/evaluator/list/index.tsx

@@ -5,13 +5,13 @@ import { JsonRendererKey } from "../../../../tui";
 import type { Core } from "../../../types";
 import { coreOptsFromCtx } from "../../../utils";
 
-const TYPE_FILTERS = ["Builtin", "code-based", "llm-as-a-judge"] as const;
+const TYPE_FILTERS = ["builtin", "code-based", "llm-as-a-judge"] as const;
 
 // The AgentCore ListEvaluators API only paginates (nextToken/maxResults); it does
 // not filter by type. `--type` is therefore applied client-side to the returned
 // page, so combining it with --max-results can under-fill a page.
 const TYPE_TO_SDK: Record<(typeof TYPE_FILTERS)[number], string> = {
-  Builtin: EvaluatorType.BUILTIN,
+  builtin: EvaluatorType.BUILTIN,
   "code-based": EvaluatorType.CODE,
   "llm-as-a-judge": EvaluatorType.CUSTOM,
 };