feat: Integrate Toolbox SDK to replace Retrieval Service

[anubhav756]

• Remove client session management from the orchestration class

  • This is now managed by Toolbox SDK internally

• Simplify prompt creation

  • This is handled by the respective tools
  • Tools descriptions, params, annotations, etc. are loaded from Toolbox
  • These are added through bind_tools from LangGraph
    • This enables removal of the custom response message creation (which was added as a TODO)

• Add logged in user's token to the RunnableConfig

  • This is necessary so that the tools that require authentication can read the user's token if available

• Simplify tools helper file by removing tools and helpers since those are now handled by Toolbox SDK internally

• Add a Toolbox URL to connect to through integration tests

• Removes ToolMessage while inserting ticket.

  • This was causing an issue with langchain-google-vertexai

  google.api_core.exceptions.InvalidArgument: 400 Please ensure that the number of function response parts should be equal to number of function call parts of the function call turn.
  

• Remove unused human and AI messages post book ticket flow.

Diagram

Important

This PR depends on a couple of features from Toolbox SDK:

• Support for optional parameters (#290)
• Self-authenticated tools via RunnableConfig (#291)

Note

The failure in the integration test is expected. This PR is part of a series of changes, and the corresponding fix for this test is in a subsequent PR.

Reasoning

We've intentionally split the work into smaller, focused PRs to make the review process more manageable and efficient.

Merge Plan

All related PRs will be merged into the toolbox-main branch first. We will ensure all tests are passing on toolbox-main before merging the entire feature set into main.

[anubhav756]

/gcbrun

[anubhav756]

/gcbrun