(function (toolsJson, globalsJson, storeJson, limitsJson) {
"use strict";
const stringify = JSON.stringify;
const parse = JSON.parse;
const promiseThen = Promise.prototype.then;
const ErrorCtor = Error;
const TypeErrorCtor = TypeError;
const RangeErrorCtor = RangeError;
const pending = new Map();
let nextId = 1;
let finished = false;
const EXIT = Object.freeze({});
const limits = parse(limitsJson);
const MAX_STORE_VALUE_CHARS = limits.maxStoreValueChars;
const MAX_STORE_TOTAL_CHARS = limits.maxStoreTotalChars;
const MAX_OUTPUT_CHARS = limits.maxOutputChars;
const MAX_OUTPUT_ITEMS = limits.maxOutputItems;
const IMAGE_HELPER_EXPECTS = limits.imageHelperExpects;
function done(ok, payload, writes) {
if (finished) return;
finished = true;
__done(
ok,
payload === undefined ? "" : payload,
writes === undefined ? "" : writes,
);
}
function serialize(value) {
return value === undefined ? undefined : stringify(value);
}
function errorText(error) {
const head = error.message
? error.name + ": " + error.message
: String(error.name);
const frames =
typeof error.stack === "string"
? error.stack
.split("\n")
.filter((line) => line.trim() && !line.includes("codemode-glue.js"))
: [];
return [head, ...frames].join("\n");
}
function format(value) {
if (typeof value === "string") return value;
if (value instanceof ErrorCtor) return errorText(value);
try {
const json = stringify(value);
return json === undefined ? String(value) : json;
} catch {
return String(value);
}
}
function describeError(error) {
if (error instanceof ErrorCtor) {
return stringify({
name: error.name,
message: error.message,
stack: errorText(error),
});
}
return stringify({ message: format(error) });
}
let outputChars = 0;
let outputItems = 0;
function output(kind, data, mimeType) {
if (finished) return;
outputChars += data.length;
outputItems++;
if (outputChars > MAX_OUTPUT_CHARS || outputItems > MAX_OUTPUT_ITEMS) {
const error = new RangeErrorCtor(
"script output exceeded the limit of " +
MAX_OUTPUT_CHARS +
" characters or " +
MAX_OUTPUT_ITEMS +
" text(), image(), and console calls. Print a summary instead, or write large data to a file with a tool.",
);
done(false, describeError(error));
throw error;
}
__output(kind, data, mimeType);
}
function caller(kind, name, spread) {
return (...args) =>
new Promise((resolve, reject) => {
let json;
try {
json = serialize(spread ? args : args[0]);
} catch (error) {
reject(error);
return;
}
const id = nextId++;
pending.set(id, { resolve, reject });
__call(id, kind, name, json === undefined ? "" : json);
});
}
const tools = Object.create(null);
const allTools = [];
for (const { name, jsName, description } of parse(toolsJson)) {
const fn = caller("call", name);
if (!(jsName in tools)) {
tools[jsName] = fn;
allTools.push(Object.freeze({ name: jsName, description }));
}
if (!(name in tools)) tools[name] = fn;
}
Object.freeze(tools);
Object.freeze(allTools);
function comparable(name) {
return name.toLowerCase().replace(/[^a-z0-9]/g, "");
}
function guard(target, label, names, hint) {
return new Proxy(target, {
get(object, property, receiver) {
if (
typeof property !== "string" ||
property in object ||
property in Object.prototype ||
property === "then" ||
property === "toJSON"
) {
return Reflect.get(object, property, receiver);
}
const wanted = comparable(property);
const exact = names.filter((name) => comparable(name) === wanted);
const close =
exact.length > 0
? exact
: names.filter(
(name) =>
wanted &&
(comparable(name).includes(wanted) ||
wanted.includes(comparable(name))),
);
let message = label + "." + property + " does not exist.";
if (close.length > 0) {
message +=
" Did you mean " +
close
.slice(0, 5)
.map((name) => label + "." + name)
.join(", ") +
"?";
} else if (names.length <= 20) {
message += " Available: " + names.join(", ") + ".";
}
if (hint) message += " " + hint;
message +=
' Check for a member with "' + property + '" in ' + label + ".";
throw new TypeErrorCtor(message);
},
});
}
const toolsProxy = guard(
tools,
"tools",
allTools.map((tool) => tool.name),
"ALL_TOOLS lists every tool; searchTools(query) finds tools by topic.",
);
const namespaces = new Map();
for (const { name, spread } of parse(globalsJson)) {
const fn = caller("global", name, spread);
const dot = name.indexOf(".");
if (dot === -1) {
Object.defineProperty(globalThis, name, { value: fn, enumerable: true });
continue;
}
const namespace = name.slice(0, dot);
if (!namespaces.has(namespace))
namespaces.set(namespace, Object.create(null));
namespaces.get(namespace)[name.slice(dot + 1)] = fn;
}
for (const [namespace, members] of namespaces) {
Object.freeze(members);
const value = guard(members, namespace, Object.keys(members));
Object.defineProperty(globalThis, namespace, {
value,
enumerable: true,
});
}
const STORE_HINT =
"store() is for small state such as IDs or summaries. Show images with image(), keep large data in variables, or write it to a file with a tool.";
const stored = new Map(Object.entries(parse(storeJson)));
const writes = new Map();
let storedChars = 0;
for (const [key, json] of stored) storedChars += key.length + json.length;
function checkKey(name, key) {
if (typeof key !== "string")
throw new TypeErrorCtor(name + "() key must be a string");
}
function store(key, value) {
checkKey("store", key);
const previous = stored.has(key) ? key.length + stored.get(key).length : 0;
if (value === undefined) {
stored.delete(key);
storedChars -= previous;
writes.set(key, undefined);
return;
}
let json;
try {
json = stringify(value);
} catch (error) {
throw new TypeErrorCtor(
"store(" +
stringify(key) +
") value is not JSON-serializable: " +
format(error),
);
}
if (json === undefined) {
throw new TypeErrorCtor(
"store(" + stringify(key) + ") value is not JSON-serializable",
);
}
if (json.length > MAX_STORE_VALUE_CHARS) {
throw new RangeErrorCtor(
"store(" +
stringify(key) +
") value has " +
json.length +
" characters of JSON, more than the limit of " +
MAX_STORE_VALUE_CHARS +
". " +
STORE_HINT,
);
}
const next = storedChars - previous + key.length + json.length;
if (next > MAX_STORE_TOTAL_CHARS) {
throw new RangeErrorCtor(
"store is full: stored values would exceed " +
MAX_STORE_TOTAL_CHARS +
" characters of JSON. Delete keys with store(key, undefined). " +
STORE_HINT,
);
}
stored.set(key, json);
storedChars = next;
writes.set(key, json);
}
function load(key) {
checkKey("load", key);
const json = stored.get(key);
return json === undefined ? undefined : parse(json);
}
function serializeWrites() {
const entries = [];
for (const [key, json] of writes)
entries.push(json === undefined ? [key] : [key, json]);
return stringify(entries);
}
Object.defineProperty(globalThis, "store", {
value: store,
enumerable: true,
});
Object.defineProperty(globalThis, "load", { value: load, enumerable: true });
function outputText(value) {
if (
value === undefined ||
value === null ||
(typeof value !== "object" && typeof value !== "function")
) {
return String(value);
}
const json = stringify(value);
return json === undefined ? String(value) : json;
}
function text(value) {
let rendered;
try {
rendered = outputText(value);
} catch (error) {
throw new TypeErrorCtor(
error instanceof ErrorCtor ? error.message : String(error),
);
}
if (!finished) output("text", rendered, "");
}
function imageUrl(value) {
if (typeof value === "string") return value;
if (typeof value !== "object" || value === null || Array.isArray(value)) {
throw new TypeErrorCtor(IMAGE_HELPER_EXPECTS);
}
if (value.image_url !== undefined) {
if (typeof value.image_url !== "string")
throw new TypeErrorCtor(IMAGE_HELPER_EXPECTS);
return value.image_url;
}
if (typeof value.type !== "string")
throw new TypeErrorCtor(IMAGE_HELPER_EXPECTS);
if (value.type !== "image") {
throw new TypeErrorCtor(
'image only accepts MCP image blocks, got "' + value.type + '"',
);
}
if (typeof value.data !== "string" || value.data === "")
throw new TypeErrorCtor("image expected MCP image data");
if (value.data.toLowerCase().startsWith("data:")) return value.data;
const mimeType =
typeof value.mimeType === "string" && value.mimeType
? value.mimeType
: "application/octet-stream";
return "data:" + mimeType + ";base64," + value.data;
}
const IMAGE_SIGNATURES = [
["image/png", /^iVBORw0KGg/],
["image/jpeg", /^[/]9j[/](?!9)/],
["image/gif", /^R0lGOD[dl]h/],
["image/webp", /^UklG.{8}RUJQ/],
];
function image(value) {
const url = imageUrl(value);
if (url === "") throw new TypeErrorCtor(IMAGE_HELPER_EXPECTS);
const colon = url.indexOf(":");
const scheme = colon === -1 ? "" : url.slice(0, colon).toLowerCase();
if (scheme === "http" || scheme === "https") {
throw new TypeErrorCtor(
"remote image URLs are not supported in tool outputs. Pass a base64 data URI instead",
);
}
const comma = url.indexOf(",");
const header = comma === -1 ? [] : url.slice(colon + 1, comma).split(";");
if (
scheme !== "data" ||
comma === -1 ||
header.slice(1).every((part) => part.toLowerCase() !== "base64")
) {
throw new TypeErrorCtor(
"invalid image output. Pass a base64 data URI instead",
);
}
const data = url.slice(comma + 1).replace(/\s+/g, "");
if (data.length % 4 !== 0 || !/^[A-Za-z0-9+/]+={0,2}$/.test(data)) {
throw new TypeErrorCtor(
"invalid image output. The image data is not valid base64 (truncated or corrupted?)",
);
}
const head = data.slice(0, 16);
const signature = IMAGE_SIGNATURES.find(([, pattern]) =>
pattern.test(head),
);
if (!signature) {
throw new TypeErrorCtor(
"invalid image output. The image data is not a PNG, JPEG, GIF, or WebP image",
);
}
output("image", data, signature[0]);
}
function exit() {
let writesJson;
try {
writesJson = serializeWrites();
} catch (error) {
done(false, describeError(error));
throw EXIT;
}
done(true, undefined, writesJson);
throw EXIT;
}
const console = {};
for (const level of ["log", "info", "warn", "error", "debug"]) {
console[level] = (...args) => {
output("text", args.map(format).join(" "), "");
};
}
Object.freeze(console);
Object.defineProperty(globalThis, "tools", {
value: toolsProxy,
enumerable: true,
});
Object.defineProperty(globalThis, "ALL_TOOLS", {
value: allTools,
enumerable: true,
});
Object.defineProperty(globalThis, "console", {
value: console,
enumerable: true,
});
Object.defineProperty(globalThis, "text", { value: text, enumerable: true });
Object.defineProperty(globalThis, "image", {
value: image,
enumerable: true,
});
Object.defineProperty(globalThis, "exit", { value: exit, enumerable: true });
const api = {
settle(id, ok, payload) {
const entry = pending.get(id);
if (!entry) return;
pending.delete(id);
if (!ok) {
entry.reject(new ErrorCtor(payload));
return;
}
let value;
try {
value = payload === "" ? undefined : parse(payload);
} catch (error) {
entry.reject(error);
return;
}
entry.resolve(value);
},
run(fn) {
let promise;
try {
promise = fn(toolsProxy, console);
} catch (error) {
done(false, describeError(error));
return;
}
promiseThen.call(
promise,
(value) => {
let json;
try {
json = serialize(value);
} catch (error) {
done(false, describeError(error));
return;
}
done(true, json, serializeWrites());
},
(error) => {
done(false, describeError(error));
},
);
},
stalled() {
if (finished || pending.size > 0) return false;
done(
false,
stringify({
name: "Error",
message:
"The script is waiting on a promise that can never settle: no tool call is pending, and timers do not exist here.",
}),
);
return true;
},
};
Object.defineProperty(globalThis, "__settle", {
value: (id, ok, payload) => api.settle(id, ok, payload),
enumerable: false,
});
return api;
});