escalateTier (autoCombo/complexityRouter.ts)

Classifies request complexity to recommend minimum provider tier for routing.

// Source: https://github.com/diegosouzapw/OmniRoute | License: MIT | Copyright 2026 diegosouzapw
// Provided via justclaw.it.com; keep this notice with the code.
/**
 * complexityRouter.ts — Request-complexity classification for tier-aware routing.
 *
 * 2026 strategy: route by the intrinsic difficulty of the *request* (not only by
 * provider stats), so trivial prompts can use cheap models and hard/reasoning
 * prompts escalate to capable ones. Built on the existing specificity detector
 * (codeComplexity / mathComplexity / reasoningDepth / contextSize / toolCalling
 * / domainSpecificity), adding an explicit tool-use → minimum-tier escalation:
 * a request carrying tool/function schemas (or agentic tool-calling signals)
 * should not be routed below the "cheap" tier even when the prose 

... (truncated -- full source via MCP)