Struct TransformedTool 

pub struct TransformedTool { /* private fields */ }

A transformed tool that wraps another tool and applies transformations.

Transformations can include:

• Renaming the tool
• Modifying the description
• Transforming arguments (rename, add defaults, hide, etc.)
• Applying a custom transformation function

Implementations

impl TransformedTool

pub fn from_tool<H: ToolHandler + 'static>(tool: H) -> TransformedToolBuilder

Creates a builder for transforming an existing tool.

pub fn from_boxed(tool: Box<dyn ToolHandler>) -> TransformedToolBuilder

Creates a builder from a boxed tool handler.

pub fn parent_definition(&self) -> Tool

Returns the parent tool’s definition.

pub fn arg_transforms(&self) -> &HashMap<String, ArgTransform>

Returns the argument transforms.

Trait Implementations

impl Debug for TransformedTool

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

Formats the value using the given formatter.

impl ToolHandler for TransformedTool

fn definition(&self) -> Tool

Returns the tool definition.

fn call(&self, ctx: &McpContext, arguments: Value) -> McpResult<Vec<Content>>

Calls the tool synchronously with the given arguments.

fn call_async<'a>( &'a self, ctx: &'a McpContext, arguments: Value, ) -> BoxFuture<'a, McpOutcome<Vec<Content>>>

Calls the tool asynchronously with the given arguments.

fn icon(&self) -> Option<&Icon>

Returns the tool’s icon, if any.

fn version(&self) -> Option<&str>

Returns the tool’s version, if any.

fn tags(&self) -> &[String]

Returns the tool’s tags for filtering and organization.

fn annotations(&self) -> Option<&ToolAnnotations>

Returns the tool’s annotations providing behavioral hints.

fn output_schema(&self) -> Option<Value>

Returns the tool’s output schema (JSON Schema).

fn final_title(&self) -> Option<&str>

Returns the final display title for this tool.

fn final_icons(&self) -> Option<&[RawIcon]>

Returns the validated final icon set for this tool.

fn final_metadata(&self) -> Option<&OpenMetadata>

Returns final open metadata for this tool’s catalog entry.

fn final_definition(&self) -> Option<FinalTool>

Returns an exact final catalog definition when this handler owns one.

fn final_tool_schema_authority(&self) -> FinalToolSchemaAuthority

Returns the legacy diagnostic label for this handler’s exact-final schemas.

fn upstream_final_tool_schema_registration( &self, ) -> Option<UpstreamFinalToolSchemaRegistration>

Returns a sealed upstream-schema registration for an exact proxy.

fn final_tool_error_structured_content( &self, _kind: ToolErrorKind, ) -> Option<Value>

Maps a framework-authored tool error into this tool’s structured output.

fn timeout(&self) -> Option<Duration>

Returns the tool’s custom timeout duration.

fn call_final( &self, ctx: &McpContext, arguments: Value, ) -> McpResult<CompleteResult<FinalCallToolResult>>

Calls the tool through the final MCP 2026-07-28 result surface.

fn call_final_async<'a>( &'a self, ctx: &'a McpContext, arguments: Value, ) -> BoxFuture<'a, McpOutcome<CompleteResult<FinalCallToolResult>>>

Asynchronously calls the tool through the final result surface.

fn call_async_in_request<'a>( &'a self, ctx: &'a McpContext, _request_cx: &'a Cx, arguments: Value, ) -> BoxFuture<'a, McpOutcome<Vec<Content>>>

Calls the tool from a request-owned structured child.

fn call_final_async_in_request<'a>( &'a self, ctx: &'a McpContext, _request_cx: &'a Cx, arguments: Value, ) -> BoxFuture<'a, McpOutcome<CompleteResult<FinalCallToolResult>>>

Calls the tool’s final result hook from a request-owned child.

fn declares_final_tasks(&self) -> bool

Declares whether this handler can return a final Tasks CreateTask outcome.

fn declares_final_mrtr(&self) -> bool

Declares whether this handler can use final MRTR continuations.

fn call_final_outcome( &self, ctx: &McpContext, arguments: Value, ) -> McpResult<FinalToolOutcome>

Calls the tool through the final complete, input-required, or task-creation surface.

fn call_final_outcome_async<'a>( &'a self, ctx: &'a McpContext, arguments: Value, ) -> BoxFuture<'a, McpOutcome<FinalToolOutcome>>

Asynchronously calls the final complete, input-required, or task-creation surface.

fn call_final_outcome_async_in_request<'a>( &'a self, ctx: &'a McpContext, _request_cx: &'a Cx, arguments: Value, ) -> BoxFuture<'a, McpOutcome<FinalToolOutcome>>

Calls the disjoint final outcome from a request-owned structured child.

fn call_final_outcome_async_resuming_in_request<'a>( &'a self, ctx: &'a McpContext, request_cx: &'a Cx, arguments: Value, _resume_inputs: Option<&'a MrtrCompletedInputs>, ) -> BoxFuture<'a, McpOutcome<FinalToolOutcome>>

Resumes a final tool invocation after framework-admitted MRTR input.