diff --git a/supabase/functions/chatgpt-plugin/README.md b/supabase/functions/chatgpt-plugin/README.md
new file mode 100644
index 0000000..ef5200f
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+++ b/supabase/functions/chatgpt-plugin/README.md
@@ -0,0 +1,13 @@
+# Build a ChatGPT Plugin
+
+## Generate openapi spec
+
+```bash
+deno run -A supabase/functions/chatgpt-plugin/generate_openapi_spec.ts
+```
+
+## Deploy function
+
+```bash
+supabase functions deploy chatgpt-plugin --no-verify-jwt
+```
diff --git a/supabase/functions/chatgpt-plugin/generate_openapi_spec.ts b/supabase/functions/chatgpt-plugin/generate_openapi_spec.ts
new file mode 100644
index 0000000..bb7fc99
--- /dev/null
+++ b/supabase/functions/chatgpt-plugin/generate_openapi_spec.ts
@@ -0,0 +1,20 @@
+import swaggerJsdoc from "npm:swagger-jsdoc@6.2.8";
+
+const options = {
+ definition: {
+ openapi: "3.0.1",
+ info: {
+ title: "TODO Plugin",
+ description: `A plugin that allows the user to create and manage a TODO list using ChatGPT. If you do not know the user's username, ask them first before making queries to the plugin. Otherwise, use the username "global".`,
+ version: "1.0.0",
+ },
+ },
+ apis: ["./supabase/functions/chatgpt-plugin/index.ts"], // files containing annotations as above
+};
+
+const openapiSpecification = swaggerJsdoc(options);
+const openapiString = JSON.stringify(openapiSpecification, null, 2);
+const encoder = new TextEncoder();
+const data = encoder.encode(openapiString);
+await Deno.writeFile("./supabase/functions/chatgpt-plugin/openapi.json", data);
+console.log(openapiString);
diff --git a/supabase/functions/chatgpt-plugin/index.ts b/supabase/functions/chatgpt-plugin/index.ts
new file mode 100644
index 0000000..635a247
--- /dev/null
+++ b/supabase/functions/chatgpt-plugin/index.ts
@@ -0,0 +1,69 @@
+import { Application, Router } from "oak";
+import manifest from "./manifest.json" assert { type: "json" };
+import openapi from "./openapi.json" assert { type: "json" };
+
+console.log("Hello from `chatgpt-plugin` Function!");
+
+const _TODOS: { [key: string]: Array<string> } = {
+ global: ["test this plugin template"],
+};
+
+/**
+ * @openapi
+ * components:
+ * schemas:
+ * getTodosResponse:
+ * type: object
+ * properties:
+ * todos:
+ * type: array
+ * items:
+ * type: string
+ * description: The list of todos.
+ */
+
+const router = new Router();
+router
+ .get("/chatgpt-plugin", (ctx) => {
+ ctx.response.body =
+ "Building ChatGPT plugins with Supabase Edge Functions!";
+ })
+ /**
+ * @openapi
+ * /todos/{username}:
+ * get:
+ * operationId: getTodos
+ * summary: Get the list of todos
+ * parameters:
+ * - in: path
+ * name: username
+ * schema:
+ * type: string
+ * required: true
+ * description: The name of the user.
+ * responses:
+ * 200:
+ * description: OK
+ * content:
+ * application/json:
+ * schema:
+ * $ref: '#/components/schemas/getTodosResponse'
+ */
+ .get("/chatgpt-plugin/todos/:username", (ctx) => {
+ const username = ctx.params.username;
+ ctx.response.body = _TODOS[username] ?? [];
+ })
+ .get("/chatgpt-plugin/.well-known/ai-plugin.json", (ctx) => {
+ ctx.response.type = "text/json";
+ ctx.response.body = JSON.stringify(manifest);
+ })
+ .get("/chatgpt-plugin/openapi.json", (ctx) => {
+ ctx.response.type = "text/json";
+ ctx.response.body = JSON.stringify(openapi);
+ });
+
+const app = new Application();
+app.use(router.routes());
+app.use(router.allowedMethods());
+
+await app.listen({ port: 8000 });
diff --git a/supabase/functions/chatgpt-plugin/manifest.json b/supabase/functions/chatgpt-plugin/manifest.json
new file mode 100644
index 0000000..4d6c803
--- /dev/null
+++ b/supabase/functions/chatgpt-plugin/manifest.json
@@ -0,0 +1,18 @@
+{
+ "schema_version": "v1",
+ "name_for_human": "TODO Plugin (no auth)",
+ "name_for_model": "todo",
+ "description_for_human": "Plugin for managing a TODO list, you can add, remove and view your TODOs.",
+ "description_for_model": "Plugin for managing a TODO list, you can add, remove and view your TODOs.",
+ "auth": {
+ "type": "none"
+ },
+ "api": {
+ "type": "openapi",
+ "url": "PLUGIN_HOSTNAME/openapi.json",
+ "is_user_authenticated": false
+ },
+ "logo_url": "PLUGIN_HOSTNAME/logo.png",
+ "contact_email": "dummy@email.com",
+ "legal_info_url": "http://www.example.com/legal"
+}
diff --git a/supabase/functions/chatgpt-plugin/openapi.json b/supabase/functions/chatgpt-plugin/openapi.json
new file mode 100644
index 0000000..332c773
--- /dev/null
+++ b/supabase/functions/chatgpt-plugin/openapi.json
@@ -0,0 +1,56 @@
+{
+ "openapi": "3.0.1",
+ "info": {
+ "title": "TODO Plugin",
+ "description": "A plugin that allows the user to create and manage a TODO list using ChatGPT. If you do not know the user's username, ask them first before making queries to the plugin. Otherwise, use the username \"global\".",
+ "version": "1.0.0"
+ },
+ "paths": {
+ "/todos/{username}": {
+ "get": {
+ "operationId": "getTodos",
+ "summary": "Get the list of todos",
+ "parameters": [
+ {
+ "in": "path",
+ "name": "username",
+ "schema": {
+ "type": "string"
+ },
+ "required": true,
+ "description": "The name of the user."
+ }
+ ],
+ "responses": {
+ "200": {
+ "description": "OK",
+ "content": {
+ "application/json": {
+ "schema": {
+ "$ref": "#/components/schemas/getTodosResponse"
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ },
+ "components": {
+ "schemas": {
+ "getTodosResponse": {
+ "type": "object",
+ "properties": {
+ "todos": {
+ "type": "array",
+ "items": {
+ "type": "string"
+ },
+ "description": "The list of todos."
+ }
+ }
+ }
+ }
+ },
+ "tags": []
+}
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