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backend/examples/plugin/codex-service-tier/README.md

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+# Codex Service Tier Plugin
+
+This plugin is a request normalizer for Codex outbound requests.
+
+When the plugin is enabled and `fast` is set to `true`, it sets the top-level `service_tier` field to `priority` for requests where:
+
+- `req.ToFormat` is `codex`
+- `req.Model` is `gpt-5.5`
+
+Requests that do not match these conditions are returned unchanged.
+
+## Configuration
+
+Add the plugin under `plugins.configs`:
+
+```yaml
+plugins:
+  configs:
+    codex-service-tier:
+      enabled: true
+      priority: 1
+      fast: false
+```
+
+`fast` is a boolean field. Set it to `true` to enable priority service tier shaping for matching Codex `gpt-5.5` requests.