Unit 10 · React safely to live events

Restore subscriptions safely after reconnecting

You reconcile catalog changes and restore known subscription intent exactly once after reconnecting. Partial failure keeps the prior known-good ownership state.

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Unit example (nearest native match)

See the idea in context

auto source = std::make_shared<axllm::AxMCPEventSource>(
  client, "inventory", "tenant:demo", "authenticated",
  axllm::AxMCPResourceSubscriptionPolicy::all());
axllm::AxEventTarget target;
target.id = "inventory-agent";
target.retrySafety = "idempotent";
target.mapInput = [](const axllm::AxEventEnvelope& event,
                     const axllm::AxEventContinuation*) {
  return axllm::object({{"uri", axllm::Core::get(event.data, "uri")}});
};
target.invoke = invoke_agent;
axllm::AxEventRuntime runtime({axllm::AxEventRoute{
  "resource-wake", "wake",
  axllm::object({{"types", axllm::array({"mcp.resource.updated"})}}),
  "inventory-agent", true,
}});
runtime.register_target(std::move(target)).add_source(source).start();

Run itIn your own project

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

#include <axllm/axllm.hpp>

auto llm = axllm::ai("openai", axllm::object({{"apiKey", std::getenv("OPENAI_API_KEY")}}));
auto classify = axllm::ax("review:string -> sentiment:class \"positive, negative, neutral\"");

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/resource_wake_agent.cpp

Active practice

Show that you can use it

Answer 2 in a row to learn this · attempt 1

Keep exploring

See the idea in context

Show that you can use it

Source-backed follow-up