> ## Documentation Index
> Fetch the complete documentation index at: https://praison.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.
# Runtime Tool Result Middleware • AI Agent SDK
> RuntimeToolResultMiddleware: Protocol for runtime-scoped tool result middleware.
# RuntimeToolResultMiddleware
> Defined in the [**middleware**](../modules/middleware) module.
AI Agent
Protocol for runtime-scoped tool result middleware.
Plugin harnesses implement this to normalize their vendor-specific
tool results into the standard NormalizedToolResult format.
```mermaid theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
%%{init: {'theme': 'base', 'themeVariables': { 'primaryColor': '#8B0000', 'primaryTextColor': '#fff', 'primaryBorderColor': '#710101', 'lineColor': '#189AB4', 'secondaryColor': '#189AB4', 'tertiaryColor': '#fff' }}}%%
graph LR
agent["Agent"] -- "uses" --> tool["Tool: RuntimeToolResultMiddleware"]
tool -- "returns" --> result["Result"]
style tool fill:#189AB4,color:#fff
style agent fill:#8B0000,color:#fff
style result fill:#8B0000,color:#fff
```
## Methods
Normalize a tool result into standard format.
Unique identifier for the runtime this middleware handles.
## Usage
```python theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
class MyHarnessMiddleware:
def normalize(self, result: Any, tool_name: str, ctx: MiddlewareContext) -> NormalizedToolResult:
# Convert vendor-specific result format to standard format
if isinstance(result, MyVendorResult):
return NormalizedToolResult(
content=result.data,
success=result.status == "ok",
error_message=result.error if result.status != "ok" else None,
metadata={
"vendor": "my_vendor",
"result_type": type(result).__name__
},
raw_result=result
)
return NormalizedToolResult(content=result)
```
## Source
`praisonaiagents/runtime/middleware.py` at line 67
***
## Related Documentation