diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 0000000..30cddc7
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,43 @@
+name: Build and Upload Caido Plugin
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v1
+        with:
+          bun-version: latest
+
+      - name: Install dependencies
+        run: |
+          bun install
+
+      - name: Build plugin
+        run: |
+          bun run build
+
+      - name: Archive built plugin
+        run: |
+          mkdir -p dist-artifact
+          cp -r dist/* dist-artifact/
+          # 만약 manifest.json도 포함되어야 한다면
+          cp manifest.json dist-artifact/
+
+      - name: Upload plugin artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: caido-plugin
+          path: dist-artifact
diff --git a/.gitignore b/.gitignore
index 029ef11..648628f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -215,10 +215,10 @@ $RECYCLE.BIN/
 # Windows shortcuts
 *.lnk
 
-!dist/
+#!dist/
 dist/*
 packages/frontend/dist
 packages/backend/dist
-!dist/*.zip
+#!dist/*.zip
 
 # End of https://www.toptal.com/developers/gitignore/api/node,macos,windows,linux
\ No newline at end of file
diff --git a/dist/plugin_package.zip b/dist/plugin_package.zip
deleted file mode 100644
index 34b70e1..0000000
Binary files a/dist/plugin_package.zip and /dev/null differ
diff --git a/playground/.gitignore b/playground/.gitignore
new file mode 100644
index 0000000..a14702c
--- /dev/null
+++ b/playground/.gitignore
@@ -0,0 +1,34 @@
+# dependencies (bun install)
+node_modules
+
+# output
+out
+dist
+*.tgz
+
+# code coverage
+coverage
+*.lcov
+
+# logs
+logs
+_.log
+report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# caches
+.eslintcache
+.cache
+*.tsbuildinfo
+
+# IntelliJ based IDEs
+.idea
+
+# Finder (MacOS) folder config
+.DS_Store
diff --git a/playground/README.md b/playground/README.md
new file mode 100644
index 0000000..4a3109f
--- /dev/null
+++ b/playground/README.md
@@ -0,0 +1,15 @@
+# playground
+
+To install dependencies:
+
+```bash
+bun install
+```
+
+To run:
+
+```bash
+bun run 
+```
+
+This project was created using `bun init` in bun v1.2.14. [Bun](https://bun.sh) is a fast all-in-one JavaScript runtime.
diff --git a/playground/bun.lock b/playground/bun.lock
new file mode 100644
index 0000000..0a70737
--- /dev/null
+++ b/playground/bun.lock
@@ -0,0 +1,25 @@
+{
+  "lockfileVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "playground",
+      "devDependencies": {
+        "@types/bun": "latest",
+      },
+      "peerDependencies": {
+        "typescript": "^5",
+      },
+    },
+  },
+  "packages": {
+    "@types/bun": ["@types/bun@1.2.14", "", { "dependencies": { "bun-types": "1.2.14" } }, "sha512-VsFZKs8oKHzI7zwvECiAJ5oSorWndIWEVhfbYqZd4HI/45kzW7PN2Rr5biAzvGvRuNmYLSANY+H59ubHq8xw7Q=="],
+
+    "@types/node": ["@types/node@22.15.21", "", { "dependencies": { "undici-types": "~6.21.0" } }, "sha512-EV/37Td6c+MgKAbkcLG6vqZ2zEYHD7bvSrzqqs2RIhbA6w3x+Dqz8MZM3sP6kGTeLrdoOgKZe+Xja7tUB2DNkQ=="],
+
+    "bun-types": ["bun-types@1.2.14", "", { "dependencies": { "@types/node": "*" } }, "sha512-Kuh4Ub28ucMRWeiUUWMHsT9Wcbr4H3kLIO72RZZElSDxSu7vpetRvxIUDUaW6QtaIeixIpm7OXtNnZPf82EzwA=="],
+
+    "typescript": ["typescript@5.8.3", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-p1diW6TqL9L07nNxvRMM7hMMw4c5XOo/1ibL4aAIGmSAt9slTE1Xgw5KWuof2uTOvCg9BY7ZRi+GaF+7sfgPeQ=="],
+
+    "undici-types": ["undici-types@6.21.0", "", {}, "sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ=="],
+  }
+}
diff --git a/playground/package.json b/playground/package.json
new file mode 100644
index 0000000..0bbbfb8
--- /dev/null
+++ b/playground/package.json
@@ -0,0 +1,10 @@
+{
+  "name": "playground",
+  "private": true,
+  "devDependencies": {
+    "@types/bun": "latest"
+  },
+  "peerDependencies": {
+    "typescript": "^5"
+  }
+}
diff --git a/playground/src/PKCEDowngradeExpress.js b/playground/src/PKCEDowngradeExpress.js
new file mode 100644
index 0000000..61cf737
--- /dev/null
+++ b/playground/src/PKCEDowngradeExpress.js
@@ -0,0 +1,31 @@
+const express = require("express");
+const app = express();
+
+app.get("/auth", (req, res) => {
+  const {
+    client_id,
+    response_type,
+    code_challenge,
+    code_challenge_method,
+    scope
+  } = req.query;
+
+  console.log("Incoming request:", req.query);
+
+  if (!client_id || response_type !== "code") {
+    return res.status(400).send("Missing required parameters");
+  }
+
+  // Simulate issuing an authorization code
+  const code = "dummy-auth-code";
+
+  // Simulate PKCE check (normally you'd validate here)
+  // We deliberately allow the downgrade here to simulate the vulnerability
+  const responseBody = `Authorization successful. code=${code}`;
+  return res.status(200).send(responseBody);
+});
+
+const PORT = 5050;
+app.listen(PORT, () => {
+  console.log(`Test PKCE server running on http://localhost:${PORT}`);
+});
diff --git a/playground/tsconfig.json b/playground/tsconfig.json
new file mode 100644
index 0000000..bfa0fea
--- /dev/null
+++ b/playground/tsconfig.json
@@ -0,0 +1,29 @@
+{
+  "compilerOptions": {
+    // Environment setup & latest features
+    "lib": ["ESNext"],
+    "target": "ESNext",
+    "module": "Preserve",
+    "moduleDetection": "force",
+    "jsx": "react-jsx",
+    "allowJs": true,
+
+    // Bundler mode
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+
+    // Best practices
+    "strict": true,
+    "skipLibCheck": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedIndexedAccess": true,
+    "noImplicitOverride": true,
+
+    // Some stricter flags (disabled by default)
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "noPropertyAccessFromIndexSignature": false
+  }
+}