feat(skills): default plugin creator to personal share flow (#22221)

## Summary
Plugin creation now defaults to the personal marketplace path and ends
with a readable handoff back into Codex after a marketplace-backed
scaffold.

Before this change, `plugin-creator` centered repo-local marketplace
updates and did not clearly guide the agent to return the user to the
created plugin afterward. This PR updates the bundled system skill so
marketplace-backed scaffolds default to `~/plugins/<plugin-name>` plus
`~/.agents/plugins/marketplace.json`, ask for user intent only when an
existing repo marketplace makes personal vs team scope ambiguous, and
end with named Markdown deeplinks labeled `View <plugin-name>` and
`Share <plugin-name>`.

## What changed
- default marketplace-backed creation to the personal plugin location
- document the explicit repo/team override path for codebases that
should own the plugin entry
- ask personal vs team only when the current Git repo already has
`.agents/plugins/marketplace.json` and the user has not stated scope
- require named Markdown deeplinks after marketplace-backed creation so
the final response returns the user to the exact plugin cleanly
- keep the deeplink targets precise with real absolute `marketplacePath`
and normalized `pluginName` values
- align the bundled prompt, scaffold help text, and marketplace
reference spec with the new default

## Testing
Tests: targeted skill validation, Python compile checks,
personal-default scaffold smoke, repo-override scaffold smoke, and
whitespace checks.

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

@@ -1,6 +1,6 @@
 ---
 name: plugin-creator
-description: Create and scaffold plugin directories for Codex with a required `.codex-plugin/plugin.json`, optional plugin folders/files, and baseline placeholders you can edit before publishing or testing. Use when Codex needs to create a new local plugin, add optional plugin structure, or generate or update repo-root `.agents/plugins/marketplace.json` entries for plugin ordering and availability metadata.
+description: Create and scaffold plugin directories for Codex with a required `.codex-plugin/plugin.json`, optional plugin folders/files, and baseline placeholders you can edit before publishing or testing. Use when Codex needs to create a new personal plugin, add optional plugin structure, or generate or update personal or repo-root `.agents/plugins/marketplace.json` entries for plugin ordering and availability metadata.
 ---
 
 # Plugin Creator
@@ -13,32 +13,36 @@ description: Create and scaffold plugin directories for Codex with a required `.
   # Plugin names are normalized to lower-case hyphen-case and must be <= 64 chars.
   # The generated folder and plugin.json name are always the same.
 # Run from repo root (or replace .agents/... with the absolute path to this SKILL).
-# By default creates in <repo_root>/plugins/<plugin-name>.
+# By default creates in ~/plugins/<plugin-name>.
 python3 .agents/skills/plugin-creator/scripts/create_basic_plugin.py <plugin-name>
 ```
 
 2. Open `<plugin-path>/.codex-plugin/plugin.json` and replace `[TODO: ...]` placeholders.
 
-3. Generate or update the repo marketplace entry when the plugin should appear in Codex UI ordering:
+3. Generate or update the personal marketplace entry when the plugin should appear in Codex UI ordering:
 
 ```bash
-# marketplace.json always lives at <repo-root>/.agents/plugins/marketplace.json
+# Personal marketplace entries default to ~/.agents/plugins/marketplace.json.
 python3 .agents/skills/plugin-creator/scripts/create_basic_plugin.py my-plugin --with-marketplace
 ```
 
-For a home-local plugin, treat `<home>` as the root and use:
+If the current Git repo already has `.agents/plugins/marketplace.json` and the user has not said
+whether the plugin is personal or shared with their team, ask before generating a marketplace entry.
+When they choose the repo marketplace, use:
 
 ```bash
 python3 .agents/skills/plugin-creator/scripts/create_basic_plugin.py my-plugin \
-  --path ~/plugins \
-  --marketplace-path ~/.agents/plugins/marketplace.json \
+  --path ./plugins \
+  --marketplace-path ./.agents/plugins/marketplace.json \
   --with-marketplace
 ```
 
 4. Generate/adjust optional companion folders as needed:
 
 ```bash
-python3 .agents/skills/plugin-creator/scripts/create_basic_plugin.py my-plugin --path <parent-plugin-directory> \
+python3 .agents/skills/plugin-creator/scripts/create_basic_plugin.py my-plugin \
+  --path <parent-plugin-directory> \
+  --marketplace-path <marketplace-json-path> \
   --with-skills --with-hooks --with-scripts --with-assets --with-mcp --with-apps --with-marketplace
 ```
 
@@ -46,11 +50,14 @@ python3 .agents/skills/plugin-creator/scripts/create_basic_plugin.py my-plugin -
 
 ## What this skill creates
 
-- If the user has not made the plugin location explicit, ask whether they want a repo-local plugin or a home-local plugin before generating marketplace entries.
+- Default marketplace-backed scaffolds are personal: `~/plugins/<plugin-name>/` plus
+  `~/.agents/plugins/marketplace.json`.
+- If the current Git repo already has `.agents/plugins/marketplace.json` and the user has not said
+  personal vs team, ask which marketplace to update before generating a marketplace entry.
 - Creates plugin root at `/<parent-plugin-directory>/<plugin-name>/`.
 - Always creates `/<parent-plugin-directory>/<plugin-name>/.codex-plugin/plugin.json`.
 - Fills the manifest with the full schema shape, placeholder values, and the complete `interface` section.
-- Creates or updates `<repo-root>/.agents/plugins/marketplace.json` when `--with-marketplace` is set.
+- Creates or updates the selected marketplace 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:
   - `My Plugin` → `my-plugin`
@@ -67,9 +74,8 @@ python3 .agents/skills/plugin-creator/scripts/create_basic_plugin.py my-plugin -
 
 ## Marketplace workflow
 
-- `marketplace.json` always lives at `<repo-root>/.agents/plugins/marketplace.json`.
-- For a home-local plugin, use the same convention with `<home>` as the root:
-  `~/.agents/plugins/marketplace.json` plus `./plugins/<plugin-name>`.
+- Personal plugins use `~/.agents/plugins/marketplace.json`.
+- Repo/team plugins use `<repo-root>/.agents/plugins/marketplace.json`.
 - Marketplace root metadata supports top-level `name` plus optional `interface.displayName`.
 - Treat plugin order in `plugins[]` as render order in Codex. Append new entries unless a user explicitly asks to reorder the list.
 - `displayName` belongs inside the marketplace `interface` object, not individual `plugins[]` entries.
@@ -107,7 +113,7 @@ python3 .agents/skills/plugin-creator/scripts/create_basic_plugin.py my-plugin -
 ```
 
 - Use `--force` only when intentionally replacing an existing marketplace entry for the same plugin name.
-- If `<repo-root>/.agents/plugins/marketplace.json` does not exist yet, create it with top-level `"name"`, an `"interface"` object containing `"displayName"`, and a `plugins` array, then add the new entry.
+- If the selected marketplace file does not exist yet, create it with top-level `"name"`, an `"interface"` object containing `"displayName"`, and a `plugins` array, then add the new entry.
 
 - For a brand-new marketplace file, the root object should look like:
 
@@ -143,7 +149,16 @@ python3 .agents/skills/plugin-creator/scripts/create_basic_plugin.py my-plugin -
 - Preserve any existing marketplace `interface.displayName`.
 - 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>`.
+- Keep marketplace `source.path` relative to the selected marketplace root as `./plugins/<plugin-name>`.
+- When the workflow created or updated a marketplace-backed plugin, end the final user-facing
+  response with these two Markdown links, in this order, and do not add any text after them:
+  - `[View <normalized plugin name>](codex://plugins/view-local?marketplacePath=<absolute marketplace.json path>&pluginName=<normalized plugin name>)`
+  - `[Share <normalized plugin name>](codex://plugins/share-local?marketplacePath=<absolute marketplace.json path>&pluginName=<normalized plugin name>)`
+- Replace the link-label placeholder and both deeplink placeholders with the real normalized plugin
+  name plus the real absolute marketplace path from the scaffolded plugin. URL-encode query
+  parameter values when needed.
+- Do not emit the `View <normalized plugin name>` or `Share <normalized plugin name>` links when no marketplace entry was
+  created or updated.
 
 ## Reference to exact spec sample
 

codex-rs/skills/src/assets/samples/plugin-creator/references/plugin-json-spec.md

@@ -99,8 +99,8 @@
 
 `marketplace.json` depends on where the plugin should live:
 
-- Repo plugin: `<repo-root>/.agents/plugins/marketplace.json`
-- Local plugin: `~/.agents/plugins/marketplace.json`
+- Personal plugin: `~/.agents/plugins/marketplace.json`
+- Repo/team plugin: `<repo-root>/.agents/plugins/marketplace.json`
 
 ```json
 {
@@ -143,9 +143,9 @@
 - `source` (`object`): Plugin source descriptor.
   - `source` (`string`): Use `local` for this repo workflow.
   - `path` (`string`): Relative plugin path based on the marketplace root.
-    - Repo plugin: `./plugins/<plugin-name>`
-    - Local plugin in `~/.agents/plugins/marketplace.json`: `./plugins/<plugin-name>`
-  - The same relative path convention is used for both repo-rooted and home-rooted marketplaces.
+    - Personal plugin in `~/.agents/plugins/marketplace.json`: `./plugins/<plugin-name>`
+    - Repo/team plugin: `./plugins/<plugin-name>`
+  - The same relative path convention is used for both personal and repo/team marketplaces.
     - Example: with `~/.agents/plugins/marketplace.json`, `./plugins/<plugin-name>` resolves to `~/plugins/<plugin-name>`.
 - `policy` (`object`): Marketplace policy block. Always include it.
   - `installation` (`string`): Availability policy.
@@ -165,6 +165,9 @@
 - Treat `policy.products` as an override and omit it unless explicitly requested.
 - Append new entries unless the user explicitly requests reordering.
 - Replace an existing entry for the same plugin only when overwrite is intentional.
-- Choose marketplace location to match the plugin destination:
-  - Repo plugin: `<repo-root>/.agents/plugins/marketplace.json`
-  - Local plugin: `~/.agents/plugins/marketplace.json`
+- Default new plugin creation to the personal marketplace.
+- If the current Git repo already has `.agents/plugins/marketplace.json` and the user has not said
+  personal or team, ask which marketplace to update before creating the entry.
+- Choose marketplace location to match the selected destination:
+  - Personal plugin: `~/.agents/plugins/marketplace.json`
+  - Repo/team plugin: `<repo-root>/.agents/plugins/marketplace.json`

codex-rs/skills/src/assets/samples/plugin-creator/scripts/create_basic_plugin.py

@@ -11,8 +11,8 @@ from typing import Any
 
 
 MAX_PLUGIN_NAME_LENGTH = 64
-DEFAULT_PLUGIN_PARENT = Path.cwd() / "plugins"
-DEFAULT_MARKETPLACE_PATH = Path.cwd() / ".agents" / "plugins" / "marketplace.json"
+DEFAULT_PLUGIN_PARENT = Path.home() / "plugins"
+DEFAULT_MARKETPLACE_PATH = Path.home() / ".agents" / "plugins" / "marketplace.json"
 DEFAULT_INSTALL_POLICY = "AVAILABLE"
 DEFAULT_AUTH_POLICY = "ON_INSTALL"
 DEFAULT_CATEGORY = "Productivity"
@@ -192,8 +192,8 @@ def parse_args() -> argparse.Namespace:
         "--path",
         default=str(DEFAULT_PLUGIN_PARENT),
         help=(
-            "Parent directory for plugin creation (defaults to <cwd>/plugins). "
-            "When using a home-rooted marketplace, use <home>/plugins."
+            "Parent directory for plugin creation (defaults to <home>/plugins). "
+            "Use <repo>/plugins when creating a repo/team plugin."
         ),
     )
     parser.add_argument("--with-skills", action="store_true", help="Create skills/ directory")
@@ -206,7 +206,7 @@ def parse_args() -> argparse.Namespace:
         "--with-marketplace",
         action="store_true",
         help=(
-            "Create or update <cwd>/.agents/plugins/marketplace.json. "
+            "Create or update <home>/.agents/plugins/marketplace.json by default. "
             "Marketplace entries always point to ./plugins/<plugin-name> relative to the "
             "marketplace root."
         ),
@@ -215,8 +215,8 @@ def parse_args() -> argparse.Namespace:
         "--marketplace-path",
         default=str(DEFAULT_MARKETPLACE_PATH),
         help=(
-            "Path to marketplace.json (defaults to <cwd>/.agents/plugins/marketplace.json). "
-            "For a home-rooted marketplace, use <home>/.agents/plugins/marketplace.json."
+            "Path to marketplace.json (defaults to <home>/.agents/plugins/marketplace.json). "
+            "Use <repo>/.agents/plugins/marketplace.json for a repo/team plugin."
         ),
     )
     parser.add_argument(