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routing-policy-change

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Modifies routing policy after signal extraction, including matched-decision logic, candidate-model selection, and downstream looper behavior. Use when changing decision predicates, thresholds, priorities, model ranking, cost or latency routing, or other post-signal routing policy.

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How to use this skill

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  3. Review the proposed files and risks before you approve installation.
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Source SKILL.md: https://github.com/vllm-project/semantic-router/blob/HEAD/tools/agent/skills/routing-policy-change/SKILL.md

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Routing Policy Change

Trigger

  • Change boolean decision logic after signal extraction
  • Change candidate-model selection, ranking, cost routing, or latency routing
  • Change looper behavior that belongs to matched-decision policy instead of signal extraction or plugin hooks

Workflow

  1. Read change surfaces and module boundaries for routing-policy context
  2. Modify decision predicates, downstream model selection, or matched-decision looper behavior
  3. Run make agent-report ENV=cpu CHANGED_FILES="..." to identify impacted surfaces
  4. Run make agent-ci-gate CHANGED_FILES="..." to validate all affected constraints
  5. Verify routing-policy behavior is covered by targeted tests and affected E2E expectations

Gotchas

  • Keep signal extraction upstream; do not smuggle classifier changes into this primary unless the signal contract itself is changing.
  • Keep plugin hooks separate; looper changes that only support matched-decision policy belong here, but request or response body plugins still belong to the plugin flow.
  • Decision predicates and candidate-model ranking can change user-visible routing even when the patch looks small, so they are not refactors by default.

Must Read

Standard Commands

  • make agent-report ENV=cpu CHANGED_FILES="..."
  • make agent-ci-gate CHANGED_FILES="..."
  • make agent-feature-gate ENV=cpu CHANGED_FILES="..."

Acceptance

  • Decision predicates and downstream candidate-model selection stay aligned with the same routing-policy intent
  • Targeted tests and affected E2E coverage are updated when routing-policy behavior changes
  • Routing-policy logic stays downstream of signal extraction and separate from plugin-only processing