majiayu000 commented on PR #614:
URL: https://github.com/apache/burr/pull/614#issuecomment-3699714026
## Before and After Example
### Before (without this fix)
```python
from burr.integrations.pydantic import pydantic_action
@pydantic_action
def my_action(state): # missing type annotation
return state
```
**Error:**
```
KeyError: 'state'
```
This error is cryptic and doesn't tell the user what went wrong.
---
### After (with this fix)
```python
from burr.integrations.pydantic import pydantic_action
@pydantic_action
def my_action(state): # missing type annotation
return state
```
**Error:**
```
ValueError: The 'state' parameter must be annotated with a type extending
pydantic.BaseModel.
```
Now the error message clearly explains what the user needs to fix.
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