Conciseness

The body is dense with non-obvious operational detail (key-replacement semantics, token-only auth, loopback binding) and explains nothing Claude already knows. Not 5 because 'Since 3.0.0 the proxy:' is time-sensitive version information outside a deprecated/old-patterns section and could be trimmed to just the current behavior; far leaner than anchor 3.

Actionability

Gives exact setting names ('provider', 'openrouter_api_key'), a copy-paste two-terminal bash block for the proxy, and concrete env vars. Not 5 because the 'Per call' section names the 'agentic_flow_agent' tool and 'model-router' agent without a single example invocation, leaving a minor gap.

Workflow Clarity

The proxy workflow has a clear two-terminal sequence with concrete commands and failure-mode warnings ('the proxy rejects anything but its token', 'Do not bind the proxy to 0.0.0.0'). Not 5 because there is no explicit validation/checkpoint step (e.g., verifying the token or connectivity before launching claude); not a destructive or batch operation, so no cap applies.

Progressive Disclosure

The skill is under 50 lines with no bundle files (references/, scripts/, assets/ absent) and no need for external references; per the simple-skill guideline it scores 5 on well-organized sections alone. The four sections (Plugin settings, Per call, Translation proxy, Local) each cover one concern and are easy to navigate.

Specificity

Lists several specific actions — 'Route agentic-flow work across Anthropic, OpenRouter, Gemini and local ONNX models, and run the Anthropic-compatible translation proxy with its per-run token' — naming four concrete providers and two concrete capabilities. Not 5 because per-call provider/model overrides and the model-router agent are part of the skill but unmentioned; well above 3's '1-2 concrete actions'.

Completeness

Explicitly answers both: what ('Route agentic-flow work across... models, and run the Anthropic-compatible translation proxy with its per-run token') and when ('Use when the user wants cheaper models, a non-Anthropic provider, local inference, or to point Claude Code at OpenRouter or Gemini'). Matches the anchor requiring both what and when with concrete trigger phrases.

Trigger Term Quality

The trigger clause includes natural phrases users would say: 'cheaper models', 'a non-Anthropic provider', 'local inference', 'to point Claude Code at OpenRouter or Gemini'. Not 5 because common variations like 'switch provider', 'alternative to Anthropic', or 'offline' are absent; clearly better than 3's partial keyword coverage.

Distinctiveness Conflict Risk

The niche is distinct — a specific plugin (agentic-flow), named providers (OpenRouter, Gemini, ONNX) and a translation proxy — but the trigger 'when the user wants cheaper models' has minor overlap risk with generic model-selection or cost-optimization skills. More distinct than anchor 3, not a fully clear niche like anchor 5.