core[minor]: dict chat prompt template support

[baskaryan]

• Support passing dicts as templates to chat prompt template
• Support making any attribute on a message a runtime variable
• Significantly simpler than trying to update our existing prompt template classes

    template = ChatPromptTemplate(
        [
            {
                "role": "assistant",
                "content": [
                    {
                        "type": "text",
                        "text": "{text1}",
                        "cache_control": {"type": "ephemeral"},
                    },
                    {"type": "image_url", "image_url": {"path": "{local_image_path}"}},
                ],
                "name": "{name1}",
                "tool_calls": [
                    {
                        "name": "{tool_name1}",
                        "args": {"arg1": "{tool_arg1}"},
                        "id": "1",
                        "type": "tool_call",
                    }
                ],
            },
            {
                "role": "tool",
                "content": "{tool_content2}",
                "tool_call_id": "1",
                "name": "{tool_name1}",
            },
        ]
    )

will likely close #25514 if we like this idea and update to use this logic

[baskaryan]

no change, just moved

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
langchain	⬜️ Ignored (Inspect)	Visit Preview		Oct 26, 2024 9:26pm

[baskaryan]

new type

[baskaryan]

TODO:

• make sure new prompt type can be opened in langsmith playground
• make sure new prompt type can be saved in prompt hub