Type definitions emit flat `backend_tool()` signatures but sandbox only exposes namespace `backend.tool()` objects

[arek-e]

Bug

generateTypeDefinitions in src/backends.ts tells the LLM to call tools using flat function syntax:

declare function fetch_fetch(args: FetchInput): Promise<any>;

But wrapCodeWithBindings in src/executor.ts only generates namespace objects, not flat functions:

const fetch = {
  fetch: (args) => SecureExec.bindings.callTool("fetch_fetch", args || {})
};

So the LLM writes await fetch_fetch({url: ...}) based on the type hints, but the sandbox throws ReferenceError: fetch_fetch is not defined at runtime. The correct call is await fetch.fetch({url: ...}).

Impact

Every LLM using the type definitions will call tools incorrectly.

Fix

Two options:

Option A — also generate flat aliases in the sandbox wrapper (minimal change, keeps flat-call ergonomics):

// after generating namespace object, add flat aliases
for (const toolName of tools) {
  const camelName = snakeToCamel(sanitizeName(toolName));
  const flatName  = `${sanitizeName(backendName)}_${sanitizeName(toolName)}`;
  aliases.push(`const ${flatName} = ${sanitizeName(backendName)}.${camelName};`);
}

This makes both fetch.fetch({...}) and fetch_fetch({...}) work.

Option B — change generateTypeDefinitions to emit namespace-style declarations:

declare const fetch: {
  fetch(args: FetchInput): Promise<any>; // Fetch a URL
};

Option A is the path of least resistance since it matches what the type hints already say.