The friction, integration effort, prompt re-engineering, capability gaps, contractual lock-in, that makes replacing one model provider with another costly.
The definition itself is disputed: what this term refers to depends on who is using it. Read any argument that leans on it twice.
Claim 5.3 asserts that API switching costs are low, which is a central pillar of the commoditization and rent-distribution arguments (B4, 3.4). The scaffold has 'tool-use' and 'agent' but nothing that explains what creates or reduces lock-in when enterprises choose model providers. This is an economics concept the argument map repeatedly invokes without scaffolding.