Tool call ids and results referencing

[KeremTurgutlu]

This PR enables AI to reference previous tool results in subsequent tool calls using $tool_call_id`` syntax when tc_refs=True.

Changes:

• Added tc_refs=False parameter to Chat.__init__ — when enabled, initializes self.tc_res={} and appends syntax instructions to system prompt
• Added tc_res_sysp constant — system prompt text explaining the $tool_call_id`` syntax with example
• Added _prep_tool_res() — prepends [tool_call_id: ...] text block to tool results so AI can see the ID
• Added _resolve_tool_refs() — parses tool arguments and replaces $id`` with actual stored results before calling function
• Updated _lite_call_func and _alite_call_func — stores raw results in tc_res dict and calls _resolve_tool_refs for reference resolution

Nit

• Fixed patch_litellm ID generation — changed +/ translation to __ so IDs match Anthropic's srvtoolu_[a-zA-Z0-9_]+ pattern

Example:

def get_data(): return "Hello"
def process(content: str): return content.upper()

chat = Chat('claude-sonnet-4-5', tools=[get_data, process], tc_refs=True)
chat("Call get_data, then pass the result to process", max_steps=10)
chat.tc_res  # {'toolu_abc': 'Hello', 'toolu_xyz': 'HELLO'}

Fixes #95 and #96

Example test dialog: https://share.solve.it.com/d/72c67213c1cf5345698a8fb010505995

[jph00]

Great stuff! :)

BTW @KeremTurgutlu this was super hard to review, because there's so much output I had to scroll through to try to find your actual changes. Are we using cachy on all these pages? Can you try to try to make it so re-running these pages doesn't change the output?

[jph00]

BTW one thing I'm torn about is whether we should be changing the system prompt automatically. Something to keep an eye on...

[jph00]

Oh don't forget to label your PRs :)