fix: remove invalid 'skills' field from plugin.json

[poparcosmin]

Summary

Installing the bug-echo plugin via /plugin install bug-echo@bug-echo fails
on Claude Code 2.1.136 with a manifest validation error.

Reproduction

/plugin marketplace add Terryc21/bug-echo   # ✅ Successfully added marketplace
/plugin install bug-echo@bug-echo            # ❌ Fails

Error message:

Failed to install: Plugin temp_local_<id> has an invalid manifest file at
/home/<user>/.claude/plugins/cache/temp_local_<id>/.claude-plugin/plugin.json.

Validation errors: skills: Invalid input

Root cause

.claude-plugin/plugin.json declares the skills field as an array of
objects ([{name, description}]):

{
  ...
  "skills": [
    {
      "name": "bug-echo",
      "description": "After fixing a bug, find and rate other instances..."
    }
  ]
}

Claude Code 2.x schema rejects this field — skills are auto-discovered
from the skills/<name>/SKILL.md directory at install time. The frontmatter
of skills/bug-echo/SKILL.md already contains all the metadata needed
(name, description, version, allowed-tools, metadata.tier,
metadata.category).

For reference, your other plugin bug-prospector has a clean manifest
with no skills field and installs without issue:
https://github.com/Terryc21/bug-prospector/blob/main/.claude-plugin/plugin.json

Fix

Remove the skills array from plugin.json. 5-line diff:

diff --git a/.claude-plugin/plugin.json b/.claude-plugin/plugin.json
index 6ab59d7..a23dc2e 100644
--- a/.claude-plugin/plugin.json
+++ b/.claude-plugin/plugin.json
@@ -15,11 +15,5 @@
     "post-fix-sweep",
     "swift",
     "swiftui"
-  ],
-  "skills": [
-    {
-      "name": "bug-echo",
-      "description": "After fixing a bug, find and rate other instances of the same pattern. Triggers: 'run bug-echo', 'echo this fix', 'scan for similar bugs', 'after-fix scan'."
-    }
   ]
 }

Happy to open a PR with this fix if helpful.

Environment

• Claude Code: 2.1.136
• OS: Linux 7.0.0-15-generic
• Plugin source: Terryc21/bug-echo v1.0.0
• Marketplace add: ✅ works
• Plugin install: ❌ fails with validation error above

Workaround

Until merged, users can side-load the skill directly:

mkdir -p ~/.claude/skills/bug-echo/examples
SRC="$(find ~/.claude/plugins/cache -path '*temp_local_*/skills/bug-echo' -type d | head -1)"
cp "$SRC/SKILL.md" ~/.claude/skills/bug-echo/SKILL.md
cp "$SRC/examples/"* ~/.claude/skills/bug-echo/examples/ 2>/dev/null
# Skill becomes available at next session start