Update tool_code.py

[Darren-w]

What this PR does / why we need it?

When the retrieved segments are too many or the historical information is too long, the function will throw an error：
"
[Errno 7] Argument list too long: '~/miniconda3/envs/maxkb/bin/python'
"

Summary of your change

Resolve the issue of function execution where the _code parameter input exceeds the maximum length.

Please indicate you've done the following:

• Made sure tests are passing and test coverage is added if needed.
• Made sure commit message follow the rule of Conventional Commits specification.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

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