docs: Add new journal entry and pages for Claude Code Plugin Marketplace and related concepts

- Created a journal entry for November 17, 2025, discussing the implementation of rulesync/MCP and its potential uses.
- Added a detailed page on Claude Code Plugin Marketplaces, including documentation links and examples of plugin definitions.
- Introduced pages for Claude Code Plugins and Subagents to enhance documentation structure and accessibility.

Author: codekiln

journals/2025_11_17.md

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+- [[rulesync/MCP]] is now implemented; I wonder how I can best start to make use of it?
+	- They mention [[Person/d-kimuson/GitHub/modular-mcp]]
+- Is is possible to use [[Claude Code/Plugin/Marketplace]] alongside [[rulesync]]?
+-

pages/Claude Code___Plugin.md

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+alias:: [[Claude Code Plugin]], [[Claude Code Plugins]]

pages/Claude Code___Plugin___Marketplace.md

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+alias:: [[Claude Code Marketplace]], [[Claude Code Marketplaces]]
+
+- # Claude Code Plugin Marketplaces
+	- Official docs: [Plugin marketplaces - Claude Code Docs](https://code.claude.com/docs/en/plugin-marketplaces)
+	- ## [[My Notes]]
+		- Claude Code Plugin Marketplaces are defined by [[Claude Code/.claude-plugin/marketplace.json]] [docs here](https://code.claude.com/docs/en/plugin-marketplaces#create-your-own-marketplace).
+			- A **[[Claude Code Marketplace]]** can define many [[Claude Code Plugin]]s.
+			- Each **[[Claude Code Plugin]]** can have many
+				- **[[Claude Code/Command]]s**: Create markdown files in `commands/` directory
+				- **[[Claude Code/Subagent]]s**: Create agent definitions in `agents/` directory
+				- **[[Claude Code Skills]]**: Create `SKILL.md` files in `skills/` directory
+				- **[[Claude Code/Hook]]s**: Create `hooks/hooks.json` for event handling
+				- **[[Claude Code/MCP Server]]s**: Create `.mcp.json` for external tool integration
+			- For example, [[Person/Daniel Avila/GitHub/claude-code-templates]] defines within its marketplace.json a [supabase-toolkit plugin](https://github.com/davila7/claude-code-templates/blob/main/.claude-plugin/marketplace.json#L31-L55) for [[Supabase]] (among dozens of other plugins)
+				- ```
+				  {
+				        "name": "supabase-toolkit",
+				        "source": "./",
+				        "description": "Complete Supabase workflow with specialized commands, data engineering agents, and MCP integrations",
+				        "version": "1.0.0",
+				        "author": {"name": "Daniel Avila"},
+				        "license": "MIT",
+				        "keywords": ["supabase", "database", "postgresql", "data"],
+				        "strict": false,
+				        "commands": [
+				          "./cli-tool/components/commands/database/supabase-backup-manager.md",
+				          "./cli-tool/components/commands/database/supabase-data-explorer.md",
+				          "./cli-tool/components/commands/database/supabase-migration-assistant.md",
+				          "./cli-tool/components/commands/database/supabase-performance-optimizer.md",
+				          "./cli-tool/components/commands/database/supabase-schema-sync.md"
+				        ],
+				        "agents": [
+				          "./cli-tool/components/agents/data-ai/data-engineer.md",
+				          "./cli-tool/components/agents/data-ai/data-scientist.md"
+				        ],
+				        "mcpServers": [
+				          "./cli-tool/components/mcps/database/postgresql-integration.json",
+				          "./cli-tool/components/mcps/database/mysql-integration.json",
+				          "./cli-tool/components/mcps/database/supabase.json"
+				        ]
+				      }
+				  ```
+			-
+	- ## Creating a Claude Code Plugin Marketplace
+		-

pages/Claude Code___Subagent.md

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+alias:: [[Claude Code Subagent]], [[Claude Code Subagents]]

pages/OReilly___Event___25___09___AI Codecon___1240 The Hitchhikers Guide to AI Coding Agents Ken Kousen.md

@@ -25,7 +25,7 @@
 			- 3. MCP Server Wrapping
 				- Headless agents exposed as MCP servers
 			- 4. Claude Code Agent Orchestration
-				- [[Anthropic/App/Claude Code/Subagent]] [Subagents - Anthropic](https://docs.anthropic.com/en/docs/claude-code/sub-agents)
+				- [[Claude Code/Subagent]] [Subagents - Anthropic](https://docs.anthropic.com/en/docs/claude-code/sub-agents)
 		- 12:55 example: Opera generator
 			- gpt 4.1 and claude are taking turns generating the libretto
 			- all these services are stateless; you have to pass the memory back and forth

pages/Person___d-kimuson___GitHub___modular-mcp.md

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+# [d-kimuson/modular-mcp](https://github.com/d-kimuson/modular-mcp)
+	- **tagline**: A Model Context Protocol (MCP) proxy server that enables efficient management of large tool collections across multiple MCP servers by grouping them and loading tool schemas on-demand.
+	- ## [[My Notes]]
+		- How does this work?
+		- via [[rulesync]] [here](https://github.com/dyoshikawa/rulesync/tree/main?tab=readme-ov-file#modular-mcp-experimental)
+			- you define a description for each mcp server
+	- ## Docs
+		- ### 1 - Configuration
+			- You define a schema with various MCP servers and just add a description
+			-
+		- ### 3 - [two tools registration](https://github.com/d-kimuson/modular-mcp?tab=readme-ov-file#3-two-tools-registration)
+			- only two tools are registered: `get-modular-tools` and `call-modular-tool`.
+		- ### 4 - On-Demand Tool Loading
+			- LLM ends up calling these two tools
+				- ```
+				  get-modular-tools(group="playwright")
+				  → Returns all playwright tool schemas
+				  
+				  call-modular-tool(group="playwright", name="browser_navigate", args={"url": "https://example.com"})
+				  → Executes the navigation through the playwright MCP server
+				  ```