Support Vercel AI Data Stream Protocol #2923
Merged
+8,328
−1,301
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Docs Preview
|
|
This would be a wonderful addon, looking forward to see it soon in main. |
|
@samuelcolvin can you add it to docs such that it would be integrated as chat service in existing Fullstack apps that uses pydantic-ai as Agent stack. |
samuelcolvin
commented
Sep 16, 2025
183amir
reviewed
Sep 18, 2025
pydantic_ai_slim/pydantic_ai/vercel_ai_elements/request_types.py
Outdated
Show resolved
Hide resolved
pydantic_ai_slim/pydantic_ai/vercel_ai_elements/response_stream.py
Outdated
Show resolved
Hide resolved
pydantic_ai_slim/pydantic_ai/vercel_ai_elements/response_stream.py
Outdated
Show resolved
Hide resolved
pydantic_ai_slim/pydantic_ai/vercel_ai_elements/response_stream.py
Outdated
Show resolved
Hide resolved
DouweM
reviewed
Oct 2, 2025
DouweM
reviewed
Oct 2, 2025
DouweM
reviewed
Oct 2, 2025
DouweM
reviewed
Oct 2, 2025
DouweM
reviewed
Oct 2, 2025
DouweM
reviewed
Oct 2, 2025
DouweM
reviewed
Oct 2, 2025
DouweM
reviewed
Oct 2, 2025
This was referenced Oct 3, 2025
Merged
# Conflicts: # examples/pydantic_ai_examples/chat_app.py # pydantic_ai_slim/pydantic_ai/agent/abstract.py # pydantic_ai_slim/pydantic_ai/run.py
DouweM
changed the title
DouweM
requested changes
Oct 8, 2025
DouweM
reviewed
Oct 9, 2025
DouweM
reviewed
Oct 9, 2025
DouweM
reviewed
Oct 9, 2025
DouweM
reviewed
Oct 9, 2025
DouweM
reviewed
Oct 9, 2025
DouweM
reviewed
Oct 9, 2025
|
fyi using this branch for datalayer/jupyter-ai-agents#45 🙏 for working on this. |
2 tasks
|
👀 Looking forward to seeing the |
samuelcolvin
commented
Oct 24, 2025
| part: ModelResponsePart | ||
| """The newly started `ModelResponsePart`.""" | ||
|
|
||
| previous_part_kind: ( |
There was a problem hiding this comment.
I think put this explanation in the docstring.
|
|
||
| ModelResponseStreamEvent = Annotated[ | ||
| PartStartEvent | PartDeltaEvent | FinalResultEvent, pydantic.Discriminator('event_kind') | ||
| PartStartEvent | PartDeltaEvent | PartEndEvent | FinalResultEvent, pydantic.Discriminator('event_kind') |
There was a problem hiding this comment.
I do think we should have an equivilant of https://docs.pydantic.dev/latest/version-policy/ where we say what we consider a breaking change, and we explicitly say we can change messages without considering a breaking change.
# Conflicts: # pyproject.toml # tests/models/test_deepseek.py # tests/models/test_huggingface.py # uv.lock
# Conflicts: # docs/ui/ag-ui.md # examples/pydantic_ai_examples/ag_ui/api/agentic_chat.py # examples/pydantic_ai_examples/ag_ui/api/tool_based_generative_ui.py
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
To do:
clai weborAgent.to_web()?This adds support for Vercel AI Elements streams to Pydantic AI.
There's an example frontend in a separate repo github.com/pydantic/pydantic-ai-chat the plan is to either make that into a more complete template, or release a
pydantic-ai-chatpython library which contains a pre-built react frontend.@DouweM we should rename this to use the proper terminology of the "Vercel AI Data Stream Protocol"
Here's a demo of basic usage:
pydantic-ai-chat.mp4