The next generation of software may lack traditional user interfaces. Instead, they will be 'API-first' or 'agent-first,' integrating directly into existing workflows like Slack or email. Software will increasingly 'visit the user' rather than requiring the user to visit a dashboard.

AI agents often default to "build it yourself" because SaaS products aren't designed for them. To stay relevant, SaaS companies must create agent-friendly CLIs, APIs, and even add hints in help text to guide agents through complex workflows.

AI isn't just a feature; it's a fundamental UI/UX shift. B2B software that isn't conversational or agent-driven now feels "terrible" and dated. This shift is causing a potential "terminal decline" for incumbents who can't adapt, as value accrues to the new agentic layer.

Enterprises no longer need to buy expensive SaaS products for tasks like customer feedback. They can now spin up custom AI agents internally, making it harder for SaaS companies to acquire new customers and leading to higher-than-modeled churn. This poses a fundamental threat to the SaaS business model.

To avoid becoming a valueless database that AI agents simply crawl, SaaS platforms must fundamentally change. The pivot is from being a UI for human data entry to becoming an orchestration layer where humans and agents collaborate, with agents becoming the primary focus of the user experience.

As users increasingly rely on AI agents, traditional graphical user interfaces will become obsolete. SaaS products must evolve to offer conversational interfaces that other agents can interact with directly. The primary user will shift from a human clicking buttons to another AI sending messages.

As AI agents increasingly perform tasks on behalf of humans, they will interact with software via APIs, not UIs. To stay relevant, SaaS platforms must adopt a 'headless' (API-first) architecture that allows agents to programmatically sign up, configure, and use their services without human intervention.

SaaS products like Salesforce won't be easily ripped out. The real danger is that new AI agents will operate across all SaaS tools, becoming the primary user interface and capturing the next wave of value. This relegates existing SaaS platforms to a lower, less valuable infrastructure layer.

The future interface for SaaS products won't just be a UI for humans or a REST API for machines. It will be an 'agent harness'—a rich environment of context, documentation, and skills that enables a customer's AI agent to expertly operate the product and extract maximum value.