Tool calling and streaming on Synap

tools = [{"type": "function", "function": {
    "name": "get_weather",
    "description": "Current weather for a city",
    "parameters": {"type": "object",
                   "properties": {"city": {"type": "string"}},
                   "required": ["city"]},
}}]

r = client.chat.completions.create(
    model="qwen3-coder-30b", messages=messages, tools=tools,
)
call = r.choices[0].message.tool_calls[0]

messages += [
    r.choices[0].message,
    {"role": "tool", "tool_call_id": call.id,
     "content": json.dumps({"city": "Tel Aviv", "c": 24, "sky": "clear"})},
]
r2 = client.chat.completions.create(
    model="qwen3-coder-30b", messages=messages, tools=tools,
)
print(r2.choices[0].message.content)

stream = client.chat.completions.create(
    model="qwen3-coder-30b", messages=messages, stream=True,
)
for chunk in stream:
    if not chunk.choices:        # last chunk carries usage, not text
        continue
    print(chunk.choices[0].delta.content or "", end="")

const stream = await client.chat.completions.create({
  model: "qwen3-coder-30b", messages, stream: true,
});
for await (const chunk of stream) {
  const delta = chunk.choices?.[0]?.delta?.content;   // last chunk has no choices
  if (delta) process.stdout.write(delta);
}