AI agents are about to route around every tool that can't pass 5 structural tests

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• Tools become agent infrastructure when they have: clean data structures, predictable schemas, programmatic access, reliable state management, and composable outputs. Nate uses Linear and Symphony as case studies.
• The practical implication: software tools not built for agent interaction will be bypassed, not upgraded. This is a product strategy warning for any SaaS tool relying on human-only workflows.
• Cross-column: the “5 structural tests” are implicitly the criteria for what makes a good MCP connector target — directly relevant to claude-integrations topic.