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Add pickAgentRoute() classifying each request into debug_failure, large_refactor, planning, tool_selection, or final_answer, and bridge support for substituting a configured agentRoutes target before dispatch when enableAgentRouting is true. Route targets resolve via the standard model resolution rules; unknown targets log agent_route_fallback and keep the requested model; selected routes and reasons are recorded in audit receipts. Disabled by default: no hidden model substitution.
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What changed
Route simple turns to a cheap Hyperagent agent and hard turns to a stronger one:
pickAgentRoute(body, tools, config)(src/protocol.mjs) deterministically classifies each request intodebug_failure→large_refactor→planning→tool_selection→final_answerfrom the last user message plus forwarded tools.agentRoutes[route]before dispatch whenenableAgentRouting: true; targets resolve through the existing model-resolution rules (ID / exact name / slug / alias).agent_route_fallbackand keep the requested model; successful substitutions recordroute/routeReason/routeTargeton the audit receipt.Config:
enableAgentRouting(false by default),agentRoutes: {}.Guarantees (test-enforced): deterministic selection with explicit precedence; unknown route falls back; disabled default never substitutes even when maps exist; logs show route + reason.
Why it saves credits
Cheap agents handle tool-selection and final-answer turns; strong/debug agents only pay off on hard turns.
Testing
npm test: 79 pass, 0 fail.