Is there a good execution layer for agents, or is everyone building this themselves?

I’ve been trying to build an iMessage agent that can actually do useful stuff for me across apps, and I keep running into the same annoying problem. The model can usually figure out what I want and what tool to call. The messy part is everything after that. For example: it sends an email and the request times out — did it fail, or did the email actually send? it moves a calendar event, then tries to message someone on Slack, but one of the steps fails a retry happens and now I’m worried it might do the same action twice the agent says “done” because the tool call looked successful, but I’m not actually sure the external app ended up in the right state I’ve been wondering how people running agents in production are handling this. Do you guys: treat unknown as a real state? check the external system before retrying? keep a separate ledger of side effects? have custom retry/idempotency logic per integration? use Temporal / LangGraph / n8n / something else for this? have a clean way to represent partial completion across multiple apps? The thing I kind of wish existed is something where my agent could just say: “Move this meeting to Friday, preserve the attendees, tell Sarah on Slack, and update the project in Notion.” …and some execution layer handles the app-specific calls, retries, partial failures, verification, etc. and just gives my agent back a clean receipt of what actually happened. Does something like this already exist? It feels like I keep having to build more and more custom execution logic around Gmail, Calendar, Slack, etc., and I’m curious if everyone else ends up doing the same thing. Would love to hear how people are handling it in production, or if there’s already a product I should be using instead of rebuilding this lol.