diff --git a/package-lock.json b/package-lock.json
index 364921e..3f02257 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,6 @@
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@@ -24,79 +23,12 @@
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-      "bin": {
-        "mime": "cli.js"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
     "node_modules/mime-db": {
       "version": "1.52.0",
       "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.52.0.tgz",
@@ -1249,15 +410,6 @@
       "integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A==",
       "license": "MIT"
     },
-    "node_modules/negotiator": {
-      "version": "0.6.3",
-      "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.3.tgz",
-      "integrity": "sha512-+EUsqGPLsM+j/zdChZjsnX51g4XrHFOIXwfnCVPGlQk/k5giakcKsuxCObBRu6DSm9opw/O6slWbJdghQM4bBg==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 0.6"
-      }
-    },
     "node_modules/node-domexception": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/node-domexception/-/node-domexception-1.0.0.tgz",
@@ -1297,30 +449,6 @@
         }
       }
     },
-    "node_modules/object-inspect": {
-      "version": "1.13.2",
-      "resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.13.2.tgz",
-      "integrity": "sha512-IRZSRuzJiynemAXPYtPe5BoI/RESNYR7TYm50MC5Mqbd3Jmw5y790sErYw3V6SryFJD64b74qQQs9wn5Bg/k3g==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
-    "node_modules/on-finished": {
-      "version": "2.4.1",
-      "resolved": "https://registry.npmjs.org/on-finished/-/on-finished-2.4.1.tgz",
-      "integrity": "sha512-oVlzkg3ENAhCk2zdv7IJwd/QUD4z2RxRwpkcGY8psCVcCYZNq4wYnVWALHM+brtuJjePWiYF/ClmuDr8Ch5+kg==",
-      "license": "MIT",
-      "dependencies": {
-        "ee-first": "1.1.1"
-      },
-      "engines": {
-        "node": ">= 0.8"
-      }
-    },
     "node_modules/openai": {
       "version": "4.55.0",
       "resolved": "https://registry.npmjs.org/openai/-/openai-4.55.0.tgz",
@@ -1362,73 +490,6 @@
       "integrity": "sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==",
       "license": "MIT"
     },
-    "node_modules/parseurl": {
-      "version": "1.3.3",
-      "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.3.tgz",
-      "integrity": "sha512-CiyeOxFT/JZyN5m0z9PfXw4SCBJ6Sygz1Dpl0wqjlhDEGGBP1GnsUVEL0p63hoG1fcj3fHynXi9NYO4nWOL+qQ==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 0.8"
-      }
-    },
-    "node_modules/path-to-regexp": {
-      "version": "0.1.7",
-      "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-0.1.7.tgz",
-      "integrity": "sha512-5DFkuoqlv1uYQKxy8omFBeJPQcdoE07Kv2sferDCrAq1ohOU+MSDswDIbnx3YAM60qIOnYa53wBhXW0EbMonrQ==",
-      "license": "MIT"
-    },
-    "node_modules/proxy-addr": {
-      "version": "2.0.7",
-      "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.7.tgz",
-      "integrity": "sha512-llQsMLSUDUPT44jdrU/O37qlnifitDP+ZwrmmZcoSKyLKvtZxpyV0n2/bD/N4tBAAZ/gJEdZU7KMraoK1+XYAg==",
-      "license": "MIT",
-      "dependencies": {
-        "forwarded": "0.2.0",
-        "ipaddr.js": "1.9.1"
-      },
-      "engines": {
-        "node": ">= 0.10"
-      }
-    },
-    "node_modules/qs": {
-      "version": "6.11.0",
-      "resolved": "https://registry.npmjs.org/qs/-/qs-6.11.0.tgz",
-      "integrity": "sha512-MvjoMCJwEarSbUYk5O+nmoSzSutSsTwF85zcHPQ9OrlFoZOYIjaqBAJIqIXjptyD5vThxGq52Xu/MaJzRkIk4Q==",
-      "license": "BSD-3-Clause",
-      "dependencies": {
-        "side-channel": "^1.0.4"
-      },
-      "engines": {
-        "node": ">=0.6"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
-    "node_modules/range-parser": {
-      "version": "1.2.1",
-      "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
-      "integrity": "sha512-Hrgsx+orqoygnmhFbKaHE6c296J+HTAQXoxEF6gNupROmmGJRoyzfG3ccAveqCBrwr/2yxQ5BVd/GTl5agOwSg==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 0.6"
-      }
-    },
-    "node_modules/raw-body": {
-      "version": "2.5.2",
-      "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-2.5.2.tgz",
-      "integrity": "sha512-8zGqypfENjCIqGhgXToC8aB2r7YrBX+AQAfIPs/Mlk+BtPTztOvTS01NRW/3Eh60J+a48lt8qsCzirQ6loCVfA==",
-      "license": "MIT",
-      "dependencies": {
-        "bytes": "3.1.2",
-        "http-errors": "2.0.0",
-        "iconv-lite": "0.4.24",
-        "unpipe": "1.0.0"
-      },
-      "engines": {
-        "node": ">= 0.8"
-      }
-    },
     "node_modules/resolve-pkg-maps": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/resolve-pkg-maps/-/resolve-pkg-maps-1.0.0.tgz",
@@ -1439,136 +500,6 @@
         "url": "https://github.com/privatenumber/resolve-pkg-maps?sponsor=1"
       }
     },
-    "node_modules/safe-buffer": {
-      "version": "5.2.1",
-      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
-      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==",
-      "funding": [
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/feross"
-        },
-        {
-          "type": "patreon",
-          "url": "https://www.patreon.com/feross"
-        },
-        {
-          "type": "consulting",
-          "url": "https://feross.org/support"
-        }
-      ],
-      "license": "MIT"
-    },
-    "node_modules/safer-buffer": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
-      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
-      "license": "MIT"
-    },
-    "node_modules/send": {
-      "version": "0.18.0",
-      "resolved": "https://registry.npmjs.org/send/-/send-0.18.0.tgz",
-      "integrity": "sha512-qqWzuOjSFOuqPjFe4NOsMLafToQQwBSOEpS+FwEt3A2V3vKubTquT3vmLTQpFgMXp8AlFWFuP1qKaJZOtPpVXg==",
-      "license": "MIT",
-      "dependencies": {
-        "debug": "2.6.9",
-        "depd": "2.0.0",
-        "destroy": "1.2.0",
-        "encodeurl": "~1.0.2",
-        "escape-html": "~1.0.3",
-        "etag": "~1.8.1",
-        "fresh": "0.5.2",
-        "http-errors": "2.0.0",
-        "mime": "1.6.0",
-        "ms": "2.1.3",
-        "on-finished": "2.4.1",
-        "range-parser": "~1.2.1",
-        "statuses": "2.0.1"
-      },
-      "engines": {
-        "node": ">= 0.8.0"
-      }
-    },
-    "node_modules/send/node_modules/ms": {
-      "version": "2.1.3",
-      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
-      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
-      "license": "MIT"
-    },
-    "node_modules/serve-static": {
-      "version": "1.15.0",
-      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.15.0.tgz",
-      "integrity": "sha512-XGuRDNjXUijsUL0vl6nSD7cwURuzEgglbOaFuZM9g3kwDXOWVTck0jLzjPzGD+TazWbboZYu52/9/XPdUgne9g==",
-      "license": "MIT",
-      "dependencies": {
-        "encodeurl": "~1.0.2",
-        "escape-html": "~1.0.3",
-        "parseurl": "~1.3.3",
-        "send": "0.18.0"
-      },
-      "engines": {
-        "node": ">= 0.8.0"
-      }
-    },
-    "node_modules/set-function-length": {
-      "version": "1.2.2",
-      "resolved": "https://registry.npmjs.org/set-function-length/-/set-function-length-1.2.2.tgz",
-      "integrity": "sha512-pgRc4hJ4/sNjWCSS9AmnS40x3bNMDTknHgL5UaMBTMyJnU90EgWh1Rz+MC9eFu4BuN/UwZjKQuY/1v3rM7HMfg==",
-      "license": "MIT",
-      "dependencies": {
-        "define-data-property": "^1.1.4",
-        "es-errors": "^1.3.0",
-        "function-bind": "^1.1.2",
-        "get-intrinsic": "^1.2.4",
-        "gopd": "^1.0.1",
-        "has-property-descriptors": "^1.0.2"
-      },
-      "engines": {
-        "node": ">= 0.4"
-      }
-    },
-    "node_modules/setprototypeof": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.2.0.tgz",
-      "integrity": "sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw==",
-      "license": "ISC"
-    },
-    "node_modules/side-channel": {
-      "version": "1.0.6",
-      "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.0.6.tgz",
-      "integrity": "sha512-fDW/EZ6Q9RiO8eFG8Hj+7u/oW+XrPTIChwCOM2+th2A6OblDtYYIpve9m+KvI9Z4C9qSEXlaGR6bTEYHReuglA==",
-      "license": "MIT",
-      "dependencies": {
-        "call-bind": "^1.0.7",
-        "es-errors": "^1.3.0",
-        "get-intrinsic": "^1.2.4",
-        "object-inspect": "^1.13.1"
-      },
-      "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
-    "node_modules/statuses": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.1.tgz",
-      "integrity": "sha512-RwNA9Z/7PrK06rYLIzFMlaF+l73iwpzsqRIFgbMLbTcLD6cOao82TaWefPXQvB2fOC4AjuYSEndS7N/mTCbkdQ==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 0.8"
-      }
-    },
-    "node_modules/toidentifier": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
-      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=0.6"
-      }
-    },
     "node_modules/tr46": {
       "version": "0.0.3",
       "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
@@ -1595,19 +526,6 @@
         "fsevents": "~2.3.3"
       }
     },
-    "node_modules/type-is": {
-      "version": "1.6.18",
-      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
-      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
-      "license": "MIT",
-      "dependencies": {
-        "media-typer": "0.3.0",
-        "mime-types": "~2.1.24"
-      },
-      "engines": {
-        "node": ">= 0.6"
-      }
-    },
     "node_modules/typescript": {
       "version": "5.5.4",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.5.4.tgz",
@@ -1633,33 +551,6 @@
       "resolved": "https://registry.npmjs.org/universal-user-agent/-/universal-user-agent-7.0.2.tgz",
       "integrity": "sha512-0JCqzSKnStlRRQfCdowvqy3cy0Dvtlb8xecj/H8JFZuCze4rwjPZQOgvFvn0Ws/usCHQFGpyr+pB9adaGwXn4Q=="
     },
-    "node_modules/unpipe": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
-      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 0.8"
-      }
-    },
-    "node_modules/utils-merge": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
-      "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 0.4.0"
-      }
-    },
-    "node_modules/vary": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
-      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 0.8"
-      }
-    },
     "node_modules/web-streams-polyfill": {
       "version": "4.0.0-beta.3",
       "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-4.0.0-beta.3.tgz",
diff --git a/package.json b/package.json
index 73cc967..32cf161 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,6 @@
   "description": "",
   "dependencies": {
     "@copilot-extensions/preview-sdk": "^4.0.2",
-    "express": "^4.19.2",
     "openai": "^4.55.0"
   },
   "devDependencies": {
diff --git a/src/index.ts b/src/index.ts
index ddb7820..11e9186 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,6 +1,6 @@
-import { createServer, IncomingMessage } from "node:http";
+import { createServer, type IncomingMessage } from "node:http";
 
-import { verifyAndParseRequest, transformPayloadForOpenAICompatibility } from "@copilot-extensions/preview-sdk";
+import { verifyAndParseRequest, transformPayloadForOpenAICompatibility, getFunctionCalls, createDoneEvent } from "@copilot-extensions/preview-sdk";
 import OpenAI from "openai";
 
 import { describeModel } from "./functions/describe-model.js";
@@ -86,7 +86,7 @@ const server = createServer(async (request, response) => {
         "<-- END OF LIST OF MODELS -->",
       ].join("\n"),
     },
-     ...compatibilityPayload.messages,
+    ...compatibilityPayload.messages,
   ];
 
   console.time("tool-call");
@@ -94,43 +94,43 @@ const server = createServer(async (request, response) => {
     stream: false,
     model: "gpt-4o",
     messages: toolCallMessages,
-    tool_choice: "auto",
     tools: functions.map((f) => f.tool),
   });
   console.timeEnd("tool-call");
 
+  const [functionToCall] = getFunctionCalls(
+    // @ts-expect-error - type error due to Copilot/OpenAI SDKs interop, I'll look into it ~@gr2m
+    toolCaller.choices[0]
+  )
+
   if (
-    !toolCaller.choices[0] ||
-    !toolCaller.choices[0].message ||
-    !toolCaller.choices[0].message.tool_calls ||
-    !toolCaller.choices[0].message.tool_calls[0].function
+    !functionToCall
   ) {
     console.log("No tool call found");
     // No tool to call, so just call the model with the original messages
     const stream = await capiClient.chat.completions.create({
       stream: true,
       model: "gpt-4o",
-      messages: payload.messages,
-    });
+      messages: compatibilityPayload.messages,
+    })
 
     for await (const chunk of stream) {
       const chunkStr = "data: " + JSON.stringify(chunk) + "\n\n";
       response.write(chunkStr);
     }
-    response.write("data: [DONE]\n\n");
-    response.end();
+
+    response.end(createDoneEvent());
     return;
   }
 
-  const functionToCall = toolCaller.choices[0].message.tool_calls[0].function;
-  const args = JSON.parse(functionToCall.arguments);
+  const args = JSON.parse(functionToCall.function.arguments);
 
   console.time("function-exec");
   let functionCallRes: RunnerResponse;
   try {
-    console.log("Executing function", functionToCall.name);
+    console.log("Executing function", functionToCall.function.name);
     const funcClass = functions.find(
-      (f) => f.definition.name === functionToCall.name
+      (f) => f.definition.name === functionToCall.function.name
     );
     if (!funcClass) {
       throw new Error("Unknown function");
@@ -138,7 +138,10 @@ const server = createServer(async (request, response) => {
 
     console.log("\t with args", args);
     const func = new funcClass(modelsAPI);
-    functionCallRes = await func.execute(payload.messages, args);
+    functionCallRes = await func.execute(
+      compatibilityPayload.messages,
+      args
+    );
   } catch (err) {
     console.error(err);
     response.statusCode = 500
@@ -162,9 +165,9 @@ const server = createServer(async (request, response) => {
       const chunkStr = "data: " + JSON.stringify(chunk) + "\n\n";
       response.write(chunkStr);
     }
-    response.write("data: [DONE]\n\n");
+
+    response.end(createDoneEvent());
     console.timeEnd("streaming");
-    response.end();
   } catch (err) {
     console.error(err);
     response.statusCode = 500
@@ -178,15 +181,14 @@ console.log(`Server running at http://localhost:${port}`);
 
 function getBody(request: IncomingMessage): Promise<string> {
   return new Promise((resolve) => {
-    const bodyParts: any[] = [];
+    const bodyParts: Buffer[] = [];
     let body;
     request
-      .on("data", (chunk) => {
+      .on("data", (chunk: Buffer) => {
         bodyParts.push(chunk);
       })
       .on("end", () => {
-        body = Buffer.concat(bodyParts).toString();
-        resolve(body);
+        resolve(Buffer.concat(bodyParts).toString());
       });
   });
 }