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# Type Alias Tool Intercept Fn

> Rewrite tool arguments before execution.

Generated from `cargo doc --no-deps -p nemo-relay -p nemo-relay-adaptive -p nemo-relay-pii-redaction -p nemo-relay-ffi -p nemo-relay-types -p nemo-relay-plugin -p nemo-relay-worker-proto -p nemo-relay-worker`.

<pre />

Rewrite tool arguments before execution.

Tool request intercepts run in priority order and can transform the JSON payload that is eventually passed into the tool execution callback.

## Parameters

* First argument: Tool name associated with the request.
* Second argument: JSON argument payload to transform.

## Returns

A [`Result`](/reference/api/rust-library-reference/nemo-relay/error/type-result) containing the transformed JSON argument payload.

## Errors

The callback can return any [`FlowError`](/reference/api/rust-library-reference/nemo-relay/error/enum-flowerror) to abort the request-intercept chain.

## Aliased Type

```rust
pub struct ToolInterceptFn { /* private fields */ }
```