Handle long-running MCP work Modern servers may return a task from an ordinary tool call, which Ax can auto-await or expose for input, cancellation, and observation. Legacy task-draft APIs remain compatibility-only. cpp academy academy/topics/mcp-tasks-advanced website/content-src/academy/course.mjs academy Handle long-running MCP work
Unit 9 · Connect to external tools and data

Handle long-running MCP work

Modern servers may return a task from an ordinary tool call, which Ax can auto-await or expose for input, cancellation, and observation. Legacy task-draft APIs remain compatibility-only.

11 focused minutesNot started
Worked example

See the idea in context

auto result = client->call_tool(
  "start_reindex", axllm::object({{"scope", "all"}}));
auto task_id = axllm::display(axllm::Core::get(
  axllm::Core::get(result, "task", axllm::Value::object()),
  "taskId", ""));
target.waitFor = axllm::array({axllm::object({
  {"kind", "mcp.task"}, {"value", "taskKey"},
  {"metadata", axllm::object({{"taskId", task_id}})},
})});
runtime.register_target(std::move(target)).start();
runtime.publish(start_event, "tenant:demo", "authenticated");
source->start_scoped([&](axllm::AxEventEnvelope event,
                            std::string scope, std::string trust) {
  runtime.publish(event, scope, trust);
});
Run itIn your own project
cmake_minimum_required(VERSION 3.20)
project(ax_quick_start LANGUAGES CXX)
set(CMAKE_CXX_STANDARD 17)

include(FetchContent)
FetchContent_Declare(axllm GIT_REPOSITORY https://github.com/ax-llm/ax GIT_TAG main SOURCE_SUBDIR packages/cpp)
FetchContent_MakeAvailable(axllm)

add_executable(quick_start quick_start.cpp)
target_link_libraries(quick_start PRIVATE axllm::axllm)

#include <axllm/axllm.hpp>
#include <cstdlib>
#include <iostream>

int main() {
  auto llm = axllm::ai("openai", axllm::object({{"apiKey", std::getenv("OPENAI_API_KEY")}}));
  auto classify = axllm::ax("review:string -> sentiment:class \"positive, negative, neutral\"");
  auto result = classify.forward(*llm, axllm::object({
    {"review", "Useful and boring in the best way."}
  }));

  auto sentiment = axllm::Core::get(result, "sentiment");
  std::cout << "sentiment: " << std::get<std::string>(sentiment.data) << "\n";
}

Set OPENAI_APIKEY in your environment before running provider-backed code.

In the ax repo

From a clone of the ax repo:

npm run example -- cpp src/examples/cpp/mcp/native_mcp_tools.cpp
Active practice

Show that you can use it

Answer 2 in a row to learn this · attempt 1
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Source-backed follow-up