Microservices Split the Stack, but Agents Want It Whole
The model isn't the bottleneck anymore. The stack underneath it is.
For two decades, the dominant story in software architecture has been decomposition. Split the monolith. Separate concerns. One service per responsibility. Each piece scales independently, ships independently, fails independently. The result is the architecture every engineer reading this has spent their career inside: a database here, a cache there, an application server somewhere else, a vector store now, a queue, a search index, an observability layer, all connected by network calls and held together by careful coordination.
That architecture was correct for the web era. It is increasingly wrong for the agent era.
Agentic workloads have a different shape than the request-response traffic that microservices were built for. An agent does not handle one request and forget it. An agent reasons over many turns, holds state across them, retrieves context from multiple sources on every decision, calls tools, waits,...
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