Inject multiple custom models with themed emojis into Google AI Studio model list. Intercepts XHR/fetch, handles array-of-arrays JSON structures.
// ==UserScript==
// @name Google AI Studio Model kingfall
// @namespace http://tampermonkey.net/
// @version 1.7
// @description Inject multiple custom models with themed emojis into Google AI Studio model list. Intercepts XHR/fetch, handles array-of-arrays JSON structures.
// @author Updated by everyone
// @match https://aistudio.google.com/*
// @match https://google.com/app/prompts/new_chat*
// @icon https://www.google.com/s2/favicons?sz=64&domain=aistudio.google.com
// @grant none
// @run-at document-start
// @license MIT
// ==/UserScript==
(function() {
'use strict';
// ============== Configuration ===============
const SCRIPT_VERSION = "v1.7";
const DEBUG = false; // set true for verbose logging
const LOG_PREFIX = `[Injector ${SCRIPT_VERSION}]`;
const MODELS_TO_INJECT = [
{ name: 'models/kingfall-ab-test', displayName: `👑 Kingfall (${SCRIPT_VERSION})`, description: `Injected by script ${SCRIPT_VERSION}` },
{ name: 'models/gemini-2.5-pro-preview-03-25', displayName: `✨ Gemini 2.5 Pro 03-25 (${SCRIPT_VERSION})`, description: `Injected by script ${SCRIPT_VERSION}` },
{ name: 'models/goldmane-ab-test', displayName: `🦁 Goldmane (${SCRIPT_VERSION})`, description: `Injected by script ${SCRIPT_VERSION}` },
{ name: 'models/claybrook-ab-test', displayName: `💧 Claybrook (${SCRIPT_VERSION})`, description: `Injected by script ${SCRIPT_VERSION}` },
{ name: 'models/frostwind-ab-test', displayName: `❄️ Frostwind (${SCRIPT_VERSION})`, description: `Injected by script ${SCRIPT_VERSION}` },
{ name: 'models/calmriver-ab-test', displayName: `🌊 Calmriver (${SCRIPT_VERSION})`, description: `Injected by script ${SCRIPT_VERSION}` }
];
// ============== Helpers ===============
function log(...args) { if (DEBUG) console.log(LOG_PREFIX, ...args); }
function isTargetURL(url) {
return typeof url === 'string' && url.includes('ListModels');
}
// Recursively find the array-of-arrays model list
function findModelListArray(obj) {
if (Array.isArray(obj) && obj.length > 0 && obj.every(
item => Array.isArray(item) && typeof item[0] === 'string' && item[0].startsWith('models/')
)) {
return obj;
}
if (obj && typeof obj === 'object') {
for (const key in obj) {
if (obj.hasOwnProperty(key)) {
const res = findModelListArray(obj[key]);
if (res) return res;
}
}
}
return null;
}
function processJsonData(data) {
const NAME_IDX = 0, DISPLAY_IDX = 3, DESC_IDX = 4, METHODS_IDX = 7;
let modified = false;
const modelsArray = findModelListArray(data);
if (!modelsArray) {
log('No model list found, skipping');
return { data, modified };
}
// find a template model that has methods
const template = modelsArray.find(m => Array.isArray(m) && Array.isArray(m[METHODS_IDX])) || null;
if (!template) {
log('Template model not found, cannot inject new models');
}
MODELS_TO_INJECT.slice().reverse().forEach(model => {
const exists = modelsArray.some(m => Array.isArray(m) && m[NAME_IDX] === model.name);
if (!exists && template) {
const clone = JSON.parse(JSON.stringify(template));
clone[NAME_IDX] = model.name;
clone[DISPLAY_IDX] = model.displayName;
clone[DESC_IDX] = `${model.description} (based on ${template[NAME_IDX]})`;
if (!Array.isArray(clone[METHODS_IDX])) {
clone[METHODS_IDX] = ['generateContent','countTokens','createCachedContent','batchGenerateContent'];
}
modelsArray.unshift(clone);
modified = true;
log('Injected', model.name);
} else if (exists) {
// update display name if changed
const existing = modelsArray.find(m => m[NAME_IDX] === model.name);
if (existing && existing[DISPLAY_IDX] !== model.displayName) {
existing[DISPLAY_IDX] = model.displayName;
modified = true;
log('Updated displayName for', model.name);
}
}
});
return { data, modified };
}
function modifyResponseBody(text, url) {
if (typeof text !== 'string') return text;
const ANTI_HIJACK = ")]}'\n";
let body = text, hasPrefix = false;
if (body.startsWith(ANTI_HIJACK)) {
body = body.slice(ANTI_HIJACK.length);
hasPrefix = true;
}
if (!body.trim()) return text;
try {
const json = JSON.parse(body);
const result = processJsonData(json);
if (result.modified) {
let out = JSON.stringify(result.data);
if (hasPrefix) out = ANTI_HIJACK + out;
return out;
}
} catch (e) {
console.error(LOG_PREFIX, 'JSON parse error for', url, e);
}
return text;
}
// ============== Fetch Interceptor ===============
const origFetch = window.fetch;
window.fetch = async function(input, init) {
const url = input instanceof Request ? input.url : String(input);
const response = await origFetch(input, init);
if (response.ok && isTargetURL(url)) {
try {
const clone = response.clone();
const text = await clone.text();
const mod = modifyResponseBody(text, url);
if (mod !== text) {
return new Response(mod, {
status: response.status,
statusText: response.statusText,
headers: response.headers
});
}
} catch (e) {
console.error(LOG_PREFIX, 'Fetch intercept error', e);
}
}
return response;
};
log('Fetch patch applied');
// ============== XHR Interceptor ===============
const xhrProto = XMLHttpRequest.prototype;
const origOpen = xhrProto.open;
const txtDesc = Object.getOwnPropertyDescriptor(xhrProto, 'responseText');
const resDesc = Object.getOwnPropertyDescriptor(xhrProto, 'response');
xhrProto.open = function(method, url) {
this._isTarget = isTargetURL(url);
return origOpen.apply(this, arguments);
};
function wrapResponse(xhr, origVal, type) {
if (xhr._isTarget && xhr.readyState === 4 && xhr.status === 200) {
const cacheKey = '_cached' + type;
if (xhr[cacheKey] === undefined) {
const txt = type === 'json' && typeof origVal === 'object'
? JSON.stringify(origVal)
: String(origVal);
xhr[cacheKey] = modifyResponseBody(txt, xhr._interceptorUrl);
}
const val = xhr[cacheKey];
if (type === 'json' && typeof val === 'string') {
try { return JSON.parse(val); } catch { return origVal; }
}
return val;
}
return origVal;
}
if (txtDesc && txtDesc.get) {
Object.defineProperty(xhrProto, 'responseText', {
get: function() {
return wrapResponse(this, txtDesc.get.call(this), 'text');
}, configurable: true
});
}
if (resDesc && resDesc.get) {
Object.defineProperty(xhrProto, 'response', {
get: function() {
const rt = resDesc.get.call(this);
if (this.responseType === 'json') return wrapResponse(this, rt, 'json');
if (!this.responseType || this.responseType === 'text') return wrapResponse(this, rt, 'text');
return rt;
}, configurable: true
});
}
log('XHR patch applied');
})();