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response = client.chat.completions.create(
    model='gpt-4o-mini',
    messages=messages,
    tools=tools,
    tool_choice='auto',  # default; can be omitted
)

response = client.chat.completions.create(
    model='gpt-4o-mini',
    messages=messages,
    tools=tools,
    tool_choice='required',
)
# Model must return a tool_call, never a free-form answer

response = client.chat.completions.create(
    model='gpt-4o-mini',
    messages=messages,
    tools=tools,
    tool_choice={'type': 'function', 'function': {'name': 'extract_entities'}},
)

# After a tool result, you might want a pure text response:
response = client.chat.completions.create(
    model='gpt-4o-mini',
    messages=messages,
    tools=tools,
    tool_choice='none',
)

def relevant_tools(state):
    if state == 'authenticated':
        return [search_orders, refund_order, escalate]
    elif state == 'guest':
        return [search_products, contact_support]
    return []

from openai import OpenAI
import numpy as np

query_emb = embed(user_query)
sims = [cosine(query_emb, tool.emb) for tool in all_tools]
top = [t for _, t in sorted(zip(sims, all_tools), reverse=True)[:10]]
# Send only these 10 to the model

tool_choice = {'type': 'auto'}
print("auto:", tool_choice)
tool_choice = {'type': 'any'}                              # required
print("any (required):", tool_choice)
tool_choice = {'type': 'tool', 'name': 'get_weather'}      # specific
print("specific tool:", tool_choice)
tool_choice = {'type': 'none'}
print("none:", tool_choice)