feat(core): support for adding PromptTemplates with formats other than f-string

[sadra-barikbin]

Allow addingPromptTemplates with formats other than f-string. Fixes #32151

[vercel]

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1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
langchain	Ignored	Preview		Sep 8, 2025 7:16pm

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #32253 will not alter performance

_{Comparing sadra-barikbin:feature/support-for-add-in-prompt_template (e72a8e3) with master (390606c)}

⚠️ Unknown Walltime execution environment detected

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Summary

✅ 13 untouched benchmarks

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #32253 will not alter performance

_{Comparing sadra-barikbin:feature/support-for-add-in-prompt_template (e72a8e3) with master (390606c)}

Summary

✅ 14 untouched benchmarks

[eyurtsev]

@sadra-barikbin overall looks good. Could you offer a few sentences on why you need to add 2 jinja2 prompts rather than just assemble a single prompt from the get-go?

[sadra-barikbin]

@eyurtsev , Sure. I was to make improvement in a prompt builder class with many private methods each one returning a part of the total prompt, all added up together finally. Changing the way prompt was built to having a huge template file containing the whole prompt was considered a sweeping change.