Struct WorkflowPromptHandler 

pub struct WorkflowPromptHandler { /* private fields */ }

Available on non-WebAssembly only.

PromptHandler implementation for SequentialWorkflow

Executes workflow steps server-side during prompts/get and returns a conversation trace showing the complete execution flow.

Example

use pmcp::Server;
use pmcp::server::workflow::{SequentialWorkflow, WorkflowStep, ToolHandle};

let workflow = SequentialWorkflow::new(
    "add_task",
    "Add a task to a project"
)
.argument("project", "Project name", true)
.argument("task", "Task description", true)
.step(
    WorkflowStep::new("list_pages", ToolHandle::new("list_pages"))
        .bind("pages")
);

let server = Server::builder()
    .name("server")
    .version("1.0.0")
    .tool("list_pages", /* tool handler */)
    .prompt_workflow(workflow)?
    .build()?;

Implementations

impl WorkflowPromptHandler

pub fn new( workflow: SequentialWorkflow, tools: HashMap<Arc<str>, ToolInfo>, tool_handlers: HashMap<Arc<str>, Arc<dyn ToolHandler>>, resource_handler: Option<Arc<dyn ResourceHandler>>, ) -> Self

Create a new workflow prompt handler with tool handlers (for testing/legacy)

Arguments

• workflow - The workflow definition (should be validated before passing)
• tools - Tool registry for metadata
• tool_handlers - Actual tool handlers for execution (bypasses middleware)
• resource_handler - Resource handler for fetching resource content

pub fn with_middleware_executor( workflow: SequentialWorkflow, tools: HashMap<Arc<str>, ToolInfo>, middleware_executor: Arc<dyn MiddlewareExecutor>, resource_handler: Option<Arc<dyn ResourceHandler>>, ) -> Self

Create a new workflow prompt handler with middleware executor (production)

This constructor uses the middleware executor, ensuring that all middleware (OAuth, logging, authorization, etc.) is applied to tool executions within workflows.

Arguments

• workflow - The workflow definition (should be validated before passing)
• tools - Tool registry for metadata
• middleware_executor - Middleware executor for tool execution with full middleware chain
• resource_handler - Resource handler for fetching resource content

Trait Implementations

impl Debug for WorkflowPromptHandler

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

Formats the value using the given formatter.

impl PromptHandler for WorkflowPromptHandler

fn handle<'life0, 'async_trait>( &'life0 self, args: HashMap<String, String>, extra: RequestHandlerExtra, ) -> Pin<Box<dyn Future<Output = Result<GetPromptResult>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

Generate a prompt with the given arguments.

fn metadata(&self) -> Option<PromptInfo>

Get prompt metadata including description and arguments schema. Returns None to use default empty metadata.