diff --git a/package.json b/package.json
index e54daf10..cc92e191 100644
--- a/package.json
+++ b/package.json
@@ -4,16 +4,7 @@
   "scripts": {
     "test": "node --test",
     "validate": "node tools/vuln_valid",
-    "create-npm-index": "node tools/create_index/create_npm_index.js",
-    "create-core-index": "node tools/create_index/create_core_index.js",
-    "create-deps-index": "node tools/create_index/create_deps_index.js"
-  },
-  "keywords": [],
-  "author": "",
-  "license": "MIT",
-  "dependencies": {
-    "@pkgjs/nv": "^0.2.1",
-    "joi": "^17.13.3",
-    "semver": "^7.3.8"
+    "create-npm-index": "node tools/create_index/",
+    "report-metrics": "node tools/report_metrics.js"
   }
 }
diff --git a/tests/report_metrics.test.js b/tests/report_metrics.test.js
new file mode 100644
index 00000000..7692d69e
--- /dev/null
+++ b/tests/report_metrics.test.js
@@ -0,0 +1,16 @@
+const { test } = require('node:test');
+const assert = require('assert');
+const { computeReporterMetrics } = require('../tools/report_metrics');
+
+test('computeReporterMetrics aggregates reporter counts', async () => {
+  const sampleIndex = [
+    { id: 1, reporter: 'alice' },
+    { id: 2, reporter: 'bob' },
+    { id: 3, reporter: 'alice' },
+    { id: 4, reporter: 'charlie' },
+    { id: 5, reporter: 'bob' },
+  ];
+
+  const metrics = await computeReporterMetrics(sampleIndex);
+  assert.deepStrictEqual(metrics, { alice: 2, bob: 2, charlie: 1 });
+});
diff --git a/tools/report_metrics.js b/tools/report_metrics.js
new file mode 100644
index 00000000..800f308b
--- /dev/null
+++ b/tools/report_metrics.js
@@ -0,0 +1,65 @@
+#!/usr/bin/env node
+/**
+ * Compute reporter metrics from a vulnerability index.
+ *
+ * The index is expected to be a JSON array of vulnerability objects.
+ * Each vulnerability may contain a `reporter`, `reporter_name`,
+ * `reporterId`, or `reporter_id` field. The script aggregates the
+ * number of reports per reporter and outputs a JSON object mapping
+ * reporter identifiers to counts.
+ *
+ * Usage:
+ *   node tools/report_metrics.js [index-file]
+ *
+ * If no index-file is provided, it defaults to `tools/vuln_index.json`.
+ */
+
+const fs = require('fs').promises;
+const path = require('path');
+
+/**
+ * Compute reporter metrics from an array of vulnerability objects.
+ *
+ * @param {Array<Object>} indexData - Array of vulnerability objects.
+ * @returns {Object<string, number>} Mapping of reporter to count.
+ */
+async function computeReporterMetrics(indexData) {
+  const metrics = new Map();
+
+  for (const vuln of indexData) {
+    const reporter =
+      vuln.reporter ||
+      vuln.reporter_name ||
+      vuln.reporterId ||
+      vuln.reporter_id;
+
+    if (!reporter) continue;
+
+    metrics.set(reporter, (metrics.get(reporter) || 0) + 1);
+  }
+
+  return Object.fromEntries(metrics);
+}
+
+/**
+ * Main entry point for the CLI.
+ */
+async function main() {
+  const indexPath =
+    process.argv[2] ?? path.resolve('tools', 'vuln_index.json');
+
+  const data = await fs.readFile(indexPath, 'utf8');
+  const index = JSON.parse(data);
+
+  const metrics = await computeReporterMetrics(index);
+  console.log(JSON.stringify(metrics, null, 2));
+}
+
+if (require.main === module) {
+  main().catch((err) => {
+    console.error(err);
+    process.exit(1);
+  });
+}
+
+module.exports = { computeReporterMetrics };