From de2679f6d18a1728c875b45101277ca4d7cd04f3 Mon Sep 17 00:00:00 2001
From: backryun <bakryun0718@proton.me>
Date: Mon, 10 Aug 2026 12:28:07 +0900
Subject: [PATCH] fix(types): stabilize skill token extraction (#9920)

---
 src/lib/skills/injection.ts         |  2 +-
 tests/unit/skills-injection.test.ts | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/src/lib/skills/injection.ts b/src/lib/skills/injection.ts
index c5a63e2077..f66af58b8f 100644
--- a/src/lib/skills/injection.ts
+++ b/src/lib/skills/injection.ts
@@ -73,7 +73,7 @@ function toLowerText(value: unknown): string {
 }
 
 function extractTokens(value: string): Set<string> {
-  const matches = value.toLowerCase().match(/[a-z0-9]+/g) || [];
+  const matches: string[] = value.toLowerCase().match(/[a-z0-9]+/g) ?? [];
   return new Set(matches.filter((t) => t.length >= TOKEN_MIN_LEN));
 }
 
diff --git a/tests/unit/skills-injection.test.ts b/tests/unit/skills-injection.test.ts
index 51eca71a9e..777ac88de1 100644
--- a/tests/unit/skills-injection.test.ts
+++ b/tests/unit/skills-injection.test.ts
@@ -186,6 +186,32 @@ test("injectSkills auto mode matches message/context semantics and applies score
   });
 });
 
+test("injectSkills auto mode only scores name tokens with at least three characters", async () => {
+  for (const name of ["aiSearch", "apiSearch"]) {
+    await skillRegistry.register({
+      name,
+      version: "1.0.0",
+      description: "find",
+      schema: { input: {}, output: {} },
+      handler: `${name}-handler`,
+      enabled: true,
+      mode: "auto",
+      apiKeyId: "key-token-length",
+    });
+  }
+
+  const tools = injectSkills({
+    provider: "other",
+    apiKeyId: "key-token-length",
+    messages: [{ role: "user", content: "ai api find" }],
+  });
+
+  assert.deepEqual(
+    tools.map((tool) => (tool as { function: { name: string } }).function.name),
+    ["apiSearch@1.0.0"]
+  );
+});
+
 test("injectSkills auto mode prefers provider-matching tagged skills", async () => {
   await skillRegistry.register({
     name: "openaiDocTool",