docs: add chatpromptbuilder yaml

[ritikraj2425]

Related Issues

• fixes Add pipeline YAML example to Haystack documentation page of ChatPromptBuilder #11132

Proposed Changes:

• Added a YAML representation of the conversational pipeline to the ChatPromptBuilder documentation.
• Included an introductory sentence explaining that the pipeline dynamically constructs prompts and generates answers using a chat model.
• Ensured the YAML example is consistent with the Python code block demonstrating the integration of ChatPromptBuilder and OpenAIChatGenerator.

How did you test it?

• Manual verification: Verified the YAML structure against standard Haystack serialization formats.
• Confirmed that the YAML correctly maps the prompt_builder.prompt output to the llm.messages input as shown in the Python example.

Notes for the reviewer

The YAML example was placed at the end of the "Usage" section to match the documentation pattern of other components recently updated with YAML examples.

Checklist

• I have read the contributors guidelines and the code of conduct.
• I have updated the related issue with new insights and changes.
• I have added unit tests and updated the docstrings. (N/A for documentation changes)
• I've used one of the conventional commit types for my PR title: docs:
• I have documented my code.
• I have added a release note file.
• I have run pre-commit hooks and fixed any issue.

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[julian-risch]

Thank you for another contribution @ritikraj2425 ! I tested this exact YAML as part of #11146 already in a google colab notebook and can confirm it works. 👍

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
haystack-docs	Ignored	Preview	Apr 20, 2026 7:10am