Myths About "Just Add an Agent": Why Most Agent Stacks Fail Before Prod

You have a slick internal SaaS for Employee Onboarding. When HR drops a new hire into the database, an engineer has to manually invite them to Slack, provision GitHub repos, and assign Jira boards. You think: "I'll just wire up an LLM agent to the HR webhook, give it our API keys as tools, and let it figure out the onboarding workflow." In local dev, it works perfectly on the first try. In staging, it provisions 400 GitHub licenses for one user, assigns the CEO to a junior onboarding Jira epic, and gets rate-limited by Slack. The gap between a local demo and production is littered with fundamental misunderstandings about what an agent actually is. Here are the four myths killing your agent stack, followed by a senior security audit of why your agent will likely fail its first pen-test. Myth 1: "Agents will figure out the workflow for you" The expectation: Give the agent a prompt like, "Onboard new users," and tools for Slack, Jira, and GitHub. It will naturally deduce that it must chec