diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
new file mode 100644
index 0000000..cbe1d0b
--- /dev/null
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -0,0 +1,12 @@
+## Summary
+
+- 
+
+## Validation
+
+- [ ] `pnpm guardian:check`
+- [ ] `pnpm test`
+
+## Notes
+
+Confirm that process state, webhook idempotency, reconciliation and settlement outbox behavior remain compatible.
diff --git a/.github/workflows/guardian.yml b/.github/workflows/guardian.yml
new file mode 100644
index 0000000..5fccd04
--- /dev/null
+++ b/.github/workflows/guardian.yml
@@ -0,0 +1,39 @@
+name: MAVULA Guardian
+
+on:
+  pull_request: {}
+  push:
+    branches:
+      - main
+  workflow_dispatch: {}
+
+permissions:
+  contents: read
+
+concurrency:
+  group: settlements-guardian-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  guardian:
+    name: guardian
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v6
+        with:
+          version: 10.33.0
+      - name: Use Node.js 22.22.3
+        uses: actions/setup-node@v6
+        with:
+          node-version: 22.22.3
+          cache: pnpm
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+      - name: Run guardian
+        run: pnpm guardian:check
+      - name: Build
+        run: pnpm build
+      - name: Test
+        run: pnpm test
diff --git a/package.json b/package.json
index 6a91acc..6e02cdb 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "version": "0.1.0",
   "private": true,
   "description": "MAVULA Settlements - payment adapter and reconciliation foundation.",
-  "author": "EstandarMustaq <mustaqueestandarjunior@gmail.com>",
+  "author": "EstandarMustaq <estandarmustaq@mavula.io>",
   "license": "AGPL-3.0-only",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
@@ -19,6 +19,7 @@
   },
   "scripts": {
     "build": "tsc -p tsconfig.json",
+    "guardian:check": "node scripts/guardian.mjs",
     "test": "tsc -p tsconfig.json && node --test test/*.test.mjs",
     "test:ci": "tsc -p tsconfig.json && node --test test/*.test.mjs",
     "typecheck": "tsc -p tsconfig.json --noEmit",
diff --git a/scripts/guardian.mjs b/scripts/guardian.mjs
new file mode 100644
index 0000000..fd591b1
--- /dev/null
+++ b/scripts/guardian.mjs
@@ -0,0 +1,70 @@
+#!/usr/bin/env node
+
+import { existsSync, readFileSync } from "node:fs";
+import { spawnSync } from "node:child_process";
+
+const failures = [];
+
+function fail(message) {
+  failures.push(message);
+}
+
+function read(path) {
+  return readFileSync(path, "utf8");
+}
+
+function json(path) {
+  return JSON.parse(read(path));
+}
+
+function requireFile(path) {
+  if (!existsSync(path)) fail(`${path} is required`);
+}
+
+const pkg = json("package.json");
+
+if (pkg.name !== "@mavula/settlements") fail("package name must be @mavula/settlements");
+if (pkg.license !== "AGPL-3.0-only") fail("settlements must remain AGPL-3.0-only");
+if (pkg.author !== "EstandarMustaq <estandarmustaq@mavula.io>") {
+  fail("author must use the MAVULA address");
+}
+if (!pkg.types) fail("settlements must publish TypeScript declarations");
+
+[
+  ".github/CODEOWNERS",
+  ".github/PULL_REQUEST_TEMPLATE.md",
+  ".github/workflows/guardian.yml",
+  "LICENSE",
+  "README.md",
+  "prisma/schema.prisma",
+  "tsconfig.json",
+].forEach(requireFile);
+
+if (!/SPDX-License-Identifier: AGPL-3\.0-only/.test(read("LICENSE"))) {
+  fail("LICENSE must declare AGPL SPDX");
+}
+if (!/@mavula\/settlements/.test(read("README.md"))) {
+  fail("README must identify @mavula/settlements");
+}
+
+const tracked = spawnSync("git", ["ls-files"], { encoding: "utf8" });
+if (tracked.status !== 0) fail("git ls-files failed");
+for (const file of tracked.stdout.split("\n").filter(Boolean)) {
+  if (/(^|\/)\.env($|\.(?!example$))/.test(file)) fail(`${file} must not be tracked`);
+}
+
+for (const path of ["package.json", "README.md", ".github/CODEOWNERS"]) {
+  if (path === "scripts/guardian.mjs") continue;
+  const content = read(path);
+  if (/getfluxo-io|@getfluxo|packages\/fengine|packages\/fwk|packages\/fpay|packages\/finfra/.test(content)) {
+    fail(`${path} contains legacy public identifiers`);
+  }
+}
+
+if (failures.length > 0) {
+  console.error("MAVULA settlements guardian failed:");
+  for (const failure of failures) console.error(`- ${failure}`);
+  process.exit(1);
+}
+
+console.log("MAVULA settlements guardian passed.");