Struct Approval 

pub struct Approval<F> { /* private fields */ }

Approval gate interceptor for tool calls.

Runs a check function before each tool execution. The function can:

• Allow the call to proceed unchanged
• Deny the call with an error message
• Modify the arguments before proceeding

Example

use llm_stack::intercept::{InterceptorStack, ToolExec, Approval, ApprovalDecision};

let stack = InterceptorStack::<ToolExec<()>>::new()
    .with(Approval::new(|req| {
        if req.name == "delete_file" {
            ApprovalDecision::Deny("Destructive operations not allowed".into())
        } else {
            ApprovalDecision::Allow
        }
    }));

Implementations

impl<F> Approval<F>

where F: Fn(&ToolRequest) -> ApprovalDecision + Send + Sync,

pub fn new(check: F) -> Self

Create an approval interceptor with the given check function.

Trait Implementations

impl<F> Debug for Approval<F>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<Ctx, F> Interceptor<ToolExec<Ctx>> for Approval<F>

where Ctx: Send + Sync + 'static, F: Fn(&ToolRequest) -> ApprovalDecision + Send + Sync,

fn intercept<'a>( &'a self, input: &'a ToolRequest, next: Next<'a, ToolExec<Ctx>>, ) -> Pin<Box<dyn Future<Output = ToolResponse> + Send + 'a>>

Intercept the operation.