SaaStr: Most B2B APIs Aren't Agent-Friendly — MCP Server + Agent SDK + llms.txt Now Table Stakes

SaaStr·medium signal

SaaStr analysis argues that having a REST API returning JSON is no longer sufficient for the agentic era. Requirements now include: MCP server (5,000+ in production, donated to Linux Foundation), agent SDKs for OpenAI/LangChain/Vercel/CrewAI frameworks, and /llms.txt files (844,000+ sites have shipped). The test: if a developer can't have their agent take meaningful action in 10 lines of code, you lose to whoever ships that first.