A routing system dispatches requests to agents identified by model nam — Agentic Systems Engineer Practice — Claude Cert Academy

A routing system dispatches requests to agents identified by model name (e.g., "claude-opus-4-7"). The model provider releases a new version under a different name. What is the immediate impact?

• Routing continues normally because the provider maintains backward compatibility for 12 months
• All routes that reference the old model name fail to match any registered agent
• Only routes with exact version strings fail; wildcard routes continue to function
• Performance degrades gradually as the old model is phased out

Answer: All routes that reference the old model name fail to match any registered agent

Routing on model name creates a hard dependency on naming conventions controlled by the provider. When the model is renamed (e.g., "claude-opus-4-7" → a new version name), all routing table entries that reference the old name fail to match — every route breaks immediately. Capability-based routing, where agents declare what they can do in a typed schema rather than advertising their model name, is resilient to renames.

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