Sequoia warns: the SaaS middleware layer faces imminent extinction

Grady Buchanan, a partner at Sequoia, draws a hard line between two categories of SaaS in the agent era: systems of record — Workday, Salesforce, ServiceNow — and the workflow applications that sit between them. The former are relatively protected because they hold the organization's canonical data; the latter are exposed to rapid replacement once AI agents become the layer that actually does the work on top of that data.

The distinction changes the rules of the game

Buchanan's split isn't theoretical. Systems of record are built around rigid schemas, permissions, audit trails and compliance — things enterprises don't rush to hand over to a language model, no matter how advanced. Workflow apps, by contrast, are mostly glue: moving leads from the CRM into a marketing tool, syncing statuses between Jira and a ticketing system, firing triggers on field changes. That is exactly the layer an agent can swallow without asking permission.

When middleware evaporates overnight

The example Rohan Paul attached to his tweet illustrates the pace: four Zapier zaps connecting a CRM to internal tools were replaced by a single agent in a day. No quarter-long implementation, no phased migration — write a prompt, hook up the API, and the old pipes disappeared. This isn't an edge case; it's the classic profile of rule-based automation that current models can mimic and improve without needing a graphical interface.

Why systems of record stay, for now

Buchanan isn't claiming Workday or Salesforce are invulnerable forever. He points out that their value sits in enterprise trust, data history and compliance — assets built over decades, not weekends. An agent can write a record into Salesforce, but the organization still wants Salesforce to be the one that decides who may write, when, and which fields change. That control layer doesn't vanish just because the execution layer swaps out.

The implication for startups and funds

For companies building a "workflow app" on top of a CRM or ERP, the time to entrench is over. The business model of "we connect X to Y" collapses when the connection becomes an ad-hoc action a model knows how to perform. Investors are already asking: what does the product do that an agent can't do tomorrow morning? Answers like "a friendly UI" or "custom logic" don't hold water when the agent learns the logic from the data itself.

What's next: the new execution layer

The emerging picture isn't total destruction but reorganization: systems of record remain at the bottom as the source of truth, AI agents occupy the execution and orchestration layer, and user interfaces shrink to oversight, exceptions and policy-setting. Classic middleware companies — Zapier, MuleSoft, Boomi and the rest — will have to decide whether to build agents themselves or become infrastructure that agents call via API. The middle, it appears, is no longer a safe place to stand.