feat: implement musl libc detection for native module

.gitignore

@@ -52,4 +52,4 @@ test-*.cjs
 test-*.mjs
 
 # Benchmark results
-benchmark-results/
+benchmark-results/

package.json

@@ -59,6 +59,8 @@
       "aarch64-apple-darwin",
       "x86_64-unknown-linux-gnu",
       "aarch64-unknown-linux-gnu",
+      "x86_64-unknown-linux-musl",
+      "aarch64-unknown-linux-musl",
       "x86_64-pc-windows-msvc"
     ]
   },
@@ -99,5 +101,4 @@
       "optional": true
     }
   }
-
-}
+}

src/native/index.ts

@@ -6,16 +6,36 @@ function getNativeBinding() {
   const platform = os.platform();
   const arch = os.arch();
 
+  // Detect musl vs glibc on Linux
+  const isMusl = () => {
+    try {
+      const lddVersion = require("child_process").execSync("ldd --version", { encoding: "utf8", stdio: ["pipe", "pipe", "ignore"] });
+      return lddVersion.includes("musl") || lddVersion.includes("MUSL");
+    } catch {
+      // Fallback: check if /etc/alpine-release exists (Alpine = musl)
+      try {
+        require("fs").accessSync("/etc/alpine-release");
+        return true;
+      } catch {
+        return false;
+      }
+    }
+  };
+
+  // Cache the result
+  const musl = isMusl();
+  const libc = musl ? "musl" : "gnu";
+
   let bindingName: string;
 
   if (platform === "darwin" && arch === "arm64") {
     bindingName = "codebase-index-native.darwin-arm64.node";
   } else if (platform === "darwin" && arch === "x64") {
     bindingName = "codebase-index-native.darwin-x64.node";
   } else if (platform === "linux" && arch === "x64") {
-    bindingName = "codebase-index-native.linux-x64-gnu.node";
+    bindingName = `codebase-index-native.linux-x64-${libc}.node`;
   } else if (platform === "linux" && arch === "arm64") {
-    bindingName = "codebase-index-native.linux-arm64-gnu.node";
+    bindingName = `codebase-index-native.linux-arm64-${libc}.node`;
   } else if (platform === "win32" && arch === "x64") {
     bindingName = "codebase-index-native.win32-x64-msvc.node";
   } else {

src/tools/index.ts

@@ -65,6 +65,9 @@ export const index_codebase: ToolDefinition = tool({
   async execute(args, context) {
     const indexer = getIndexer();
 
+    // Guard: use noop if context is not provided
+    const safeContext = context || { metadata: () => {} };
+
     if (args.estimateOnly) {
       const estimate = await indexer.estimateCost();
       return formatCostEstimate(estimate);
@@ -75,7 +78,7 @@ export const index_codebase: ToolDefinition = tool({
     }
 
     const stats = await indexer.index((progress) => {
-      context.metadata({
+      safeContext.metadata({
         title: formatProgressTitle(progress),
         metadata: {
           phase: progress.phase,