> ## 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.
# Resolve Trace Hook • AI Agent SDK
> resolve_trace_hook: Return ``hook`` when a tracer is supplied, else the no-op default.
# resolve\_trace\_hook
Function
> This function is defined in the [**protocols**](../modules/protocols) module.
Return `hook` when a tracer is supplied, else the no-op default.
A tiny helper so a gateway can accept an optional `tracer=` argument and
always hold a callable hook without branching on `None` at every stage.
```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 TD
event["Event Trigger"] --> hook["Hook: resolve_trace_hook"]
hook --> decision{"Decision"}
decision -- "Allow" --> proc["Process"]
decision -- "Deny" --> block["Block"]
style hook fill:#189AB4,color:#fff
style event fill:#8B0000,color:#fff
style proc fill:#8B0000,color:#fff
style block fill:#8B0000,color:#fff
```
## Signature
```python theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
def resolve_trace_hook(hook: 'Optional[GatewayTraceHook]') -> 'GatewayTraceHook'
```
## Parameters
A user/plugin-supplied trace hook, or `None`.
### Returns
data:`NULL_GATEWAY_TRACE_HOOK`.
## Source
`praisonaiagents/gateway/protocols.py` at line 4897
***
## Related Documentation