docs(skills): point plugin workflows to eval

codex-rs/skills/src/assets/samples/plugin-creator/SKILL.md

@@ -57,6 +57,9 @@ python3 .agents/skills/plugin-creator/scripts/create_basic_plugin.py my-plugin -
   or strong repo context; when that evidence is missing, ask the user for the value instead of
   inventing one.
 - For local testing after scaffold creation, use `sideload-plugin`; it installs the plugin into the temporary `$CODEX_HOME/plugins/cache` development cache.
+- When the user wants to evaluate or improve the resulting plugin, point them to the
+  `plugin-eval` plugin from the `openai-curated` marketplace instead of trying to fold evaluation
+  into this scaffold workflow.
 - Creates or updates `<repo-root>/.agents/plugins/marketplace.json` when `--with-marketplace` is set.
   - If the marketplace file does not exist yet, seed top-level `name` plus `interface.displayName` placeholders before adding the first plugin entry.
 - `<plugin-name>` is normalized using skill-creator naming rules:
@@ -154,6 +157,8 @@ python3 .agents/skills/plugin-creator/scripts/create_basic_plugin.py my-plugin -
 - When generating marketplace entries, always write `policy.installation`, `policy.authentication`, and `category` even if their values are defaults.
 - Add `policy.products` only when the user explicitly asks for that override.
 - Keep marketplace `source.path` relative to repo root as `./plugins/<plugin-name>`.
+- Use `plugin-eval` from the `openai-curated` marketplace when the next task is evaluating,
+  benchmarking, or deciding what to improve in a local plugin.
 
 ## Reference to exact spec sample
 

codex-rs/skills/src/assets/samples/plugin-creator/agents/openai.yaml

@@ -1,6 +1,6 @@
 interface:
   display_name: "Plugin Creator"
   short_description: "Scaffold plugins and marketplace entries"
-  default_prompt: "Use $plugin-creator to scaffold a plugin with placeholder plugin.json, optional structure, and a marketplace.json entry. Fill metadata from explicit user input or strong local context, and ask rather than guess when values are unknown. Use $sideload-plugin next when the user wants to install the local plugin into the temporary Codex cache for testing."
+  default_prompt: "Use $plugin-creator to scaffold a plugin with placeholder plugin.json, optional structure, and a marketplace.json entry. Fill metadata from explicit user input or strong local context, and ask rather than guess when values are unknown. Use $sideload-plugin next for temporary local testing, and point users to the openai-curated `plugin-eval` plugin when they want to evaluate or improve the result."
   icon_small: "./assets/plugin-creator-small.svg"
   icon_large: "./assets/plugin-creator.png"

codex-rs/skills/src/assets/samples/sideload-plugin/SKILL.md

@@ -84,6 +84,9 @@ python3 .agents/skills/sideload-plugin/scripts/install_plugin_to_cache.py <plugi
 
 Use `plugin-creator` or a real marketplace workflow when the goal is to publish, share, or persist plugin source metadata. This skill is only for local development installs into a disposable cache.
 
+If the user wants to evaluate, benchmark, or improve the sideloaded plugin after testing it, point
+them to the `plugin-eval` plugin from the `openai-curated` marketplace.
+
 ## Validation
 
 After changing the script, run a smoke test with a temporary Codex home:

codex-rs/skills/src/assets/samples/sideload-plugin/agents/openai.yaml

@@ -1,4 +1,4 @@
 interface:
   display_name: "Sideload Plugin"
   short_description: "Install local plugins into the temporary Codex cache"
-  default_prompt: "Use $sideload-plugin to install a local plugin into the temporary Codex plugin cache for development testing."
+  default_prompt: "Use $sideload-plugin to install a local plugin into the temporary Codex plugin cache for development testing. If the user wants to evaluate or improve it afterward, point them to the openai-curated `plugin-eval` plugin."