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    Tool

    source
    pub(open) trait Tool {
      fn name(Self) -> String
      fn description(Self) -> String
      fn params(Self) -> Array[ParamDef]
      async fn execute(Self, Json) -> ToolCallOutcome
    }

    Core Tool trait following MCP protocol

    ParamDef

    source
    pub(all) struct ParamDef {
      name : String
      description : String
      type_ : String
      required : Bool
    } derive(Eq, 
    Debug    )

    Parameter definition for tool schema

    ToolCallOutcome

    source
    pub(all) enum ToolCallOutcome {
      Complete(ToolResult)
      InputRequired(input_requests~ : Map[String, 
    InputRequestEntry    ], state~ : Json)
    } derive(Eq, 
    Debug    )

    Outcome of a tool execution. Per the 2026-07-28 MRTR pattern, a tool may either complete normally (Complete) or request additional client input (InputRequired). On retry, the client resubmits with inputResponses and the echoed requestState; the tool then receives those responses via its arguments and returns Complete.

    ToolResult

    source
    pub struct ToolResult {
      content : Array[
    ContentItem    ]
      is_error : Bool
    } derive(Eq, 
    Debug    )

    Tool execution result following MCP protocol format

    ToolResult::error

    source
    fn ToolResult::error(message : String) -> ToolResult

    Create an error result with error message

    ToolResult::success

    source

    Create a successful result with multiple content items

    ToolResult::text

    source
    fn ToolResult::text(text : String) -> ToolResult

    Create a successful result with text content

    get_number

    source
    fn get_number(json : Json, key : String) -> Result[Double, ToolResult]

    Extract number from JSON, returning error ToolResult on failure

    get_optional_number

    source
    fn get_optional_number(json : Json, key : String) -> Result[Double?, ToolResult]

    Extract optional number from JSON

    get_optional_string

    source
    fn get_optional_string(json : Json, key : String) -> Result[String?, ToolResult]

    Extract optional string from JSON

    get_string

    source
    fn get_string(json : Json, key : String) -> Result[String, ToolResult]

    Extract string from JSON, returning error ToolResult on failure

    Source Files

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