docs: Enhance HumanInTheLoopMiddleware configuration for email review

[mcavdar]

Overview

The current config produces an issue:

Traceback (most recent call last):
  File "<stdin>", line 4, in <module>
  File "/home/mc/.venv-langchain-v1/lib/python3.10/site-packages/langchain/agents/middleware/human_in_the_loop.py", line 193, in __init__
    elif tool_config.get("allowed_decisions"):
AttributeError: 'str' object has no attribute 'get'

The old example conflicts with the configuration options described in LangChain’s documentation

The description field is part of InterruptOnConfig, so the dictionary value should be an InterruptOnConfig object.

Type of change

Type: [Update existing documentation /bug/Remove outdated content]

Related issues/PRs

• GitHub issue:
• Feature PR:

• Linear issue:
• Slack thread:

Checklist

• I have read the contributing guidelines
• I have tested my changes locally using docs dev
• All code examples have been tested and work correctly
• I have used root relative paths for internal links
• I have updated navigation in src/docs.json if needed
• I have gotten approval from the relevant reviewers
• (Internal team members only / optional) I have created a preview deployment using the Create Preview Branch workflow

Additional notes