Implement a plugin as alternative for deprecated Explanatory output style

plugins/explanatory-output-style/.claude-plugin/plugin.json

@@ -0,0 +1,9 @@
+{
+  "name": "explanatory-output-style",
+  "version": "1.0.0",
+  "description": "Adds educational insights about implementation choices and codebase patterns (mimics the deprecated Explanatory output style)",
+  "author": {
+    "name": "Anthropic",
+    "email": "support@anthropic.com"
+  }
+}

plugins/explanatory-output-style/README.md

@@ -0,0 +1,56 @@
+# Explanatory Output Style Plugin
+
+This plugin recreates the deprecated Explanatory output style as a SessionStart hook.
+
+## What it does
+
+When enabled, this plugin automatically adds instructions at the start of each session that encourage Claude to:
+
+1. Provide educational insights about implementation choices
+2. Explain codebase patterns and decisions
+3. Balance task completion with learning opportunities
+
+## How it works
+
+The plugin uses a SessionStart hook to inject additional context into every session. This context instructs Claude to provide brief educational explanations before and after writing code, formatted as:
+
+```
+`★ Insight ─────────────────────────────────────`
+[2-3 key educational points]
+`─────────────────────────────────────────────────`
+```
+
+## Installation
+
+Install this plugin from the Claude Code marketplace, or manually by placing it in your `.claude/plugins` directory.
+
+## Usage
+
+Once installed, the plugin activates automatically at the start of every session. No additional configuration is needed.
+
+The insights focus on:
+- Specific implementation choices for your codebase
+- Patterns and conventions in your code
+- Trade-offs and design decisions
+- Codebase-specific details rather than general programming concepts
+
+## Migration from Output Styles
+
+This plugin replaces the deprecated "Explanatory" output style setting. If you previously used:
+
+```json
+{
+  "outputStyle": "Explanatory"
+}
+```
+
+You can now achieve the same behavior by installing this plugin instead.
+
+## Managing changes
+
+* Disable the plugin - keep the code installed on your device
+* Uninstall the plugin - remove the code from your device
+* Update the plugin - create a local copy of this plugin to personalize this plugin
+    - Hint: Ask Claude to read https://docs.claude.com/en/docs/claude-code/plugins.md and set it up for you!
+
+

plugins/explanatory-output-style/hooks-handlers/session-start.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# Output the explanatory mode instructions as additionalContext
+# This mimics the deprecated Explanatory output style
+
+cat << 'EOF'
+{
+  "hookSpecificOutput": {
+    "hookEventName": "SessionStart",
+    "additionalContext": "You are in 'explanatory' output style mode, where you should provide educational insights about the codebase as you help with the user's task.\n\nYou should be clear and educational, providing helpful explanations while remaining focused on the task. Balance educational content with task completion. When providing insights, you may exceed typical length constraints, but remain focused and relevant.\n\n## Insights\nIn order to encourage learning, before and after writing code, always provide brief educational explanations about implementation choices using (with backticks):\n\"`★ Insight ─────────────────────────────────────`\n[2-3 key educational points]\n`─────────────────────────────────────────────────`\"\n\nThese insights should be included in the conversation, not in the codebase. You should generally focus on interesting insights that are specific to the codebase or the code you just wrote, rather than general programming concepts. Do not wait until the end to provide insights. Provide them as you write code."
+  }
+}
+EOF
+
+exit 0

plugins/explanatory-output-style/hooks/hooks.json

@@ -0,0 +1,15 @@
+{
+  "description": "Explanatory mode hook that adds educational insights instructions",
+  "hooks": {
+    "SessionStart": [
+      {
+        "hooks": [
+          {
+            "type": "command",
+            "command": "${CLAUDE_PLUGIN_ROOT}/hooks-handlers/session-start.sh"
+          }
+        ]
+      }
+    ]
+  }
+}