Add Claude Code marketplace install support (.claude-plugin)

[Copilot]

Users currently must manually edit ~/.claude.json to configure the MCP server. This adds the .claude-plugin/ directory to enable one-command installation via the Claude Code plugin marketplace.

Changes

• .claude-plugin/plugin.json — MCP server config consumed at install time; wires up npx -y server-shannon-thinking@latest
• .claude-plugin/marketplace.json — marketplace discovery metadata (name, owner, description, version)

Once merged, users can install via:

/plugin marketplace add olaservo/shannon-thinking
/plugin install shannon-thinking

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add Claude Code marketplace install support (.claude-plugin)</issue_title>
<issue_description>## Feature Request

It would be great to support one-command installation via the Claude Code plugin marketplace:

/plugin marketplace add olaservo/shannon-thinking
/plugin install shannon-thinking

Right now users have to manually edit ~/.claude.json to add the MCP server config.

What's needed

Add a .claude-plugin/ directory with two files:

.claude-plugin/plugin.json

{
  "name": "shannon-thinking",
  "version": "1.0.0",
  "description": "Shannon-inspired structured thinking MCP server",
  "author": {
    "name": "olaservo"
  },
  "mcpServers": {
    "shannon-thinking": {
      "command": "npx",
      "args": ["-y", "server-shannon-thinking@latest"]
    }
  }
}

.claude-plugin/marketplace.json

{
  "name": "shannon-thinking",
  "owner": {
    "name": "olaservo"
  },
  "metadata": {
    "description": "Shannon-inspired structured thinking MCP server for Claude Code",
    "version": "1.0.0"
  },
  "plugins": [
    {
      "name": "shannon-thinking",
      "description": "Structured thinking tool using Shannon's information-theoretic approach",
      "source": "./"
    }
  ]
}

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add Claude Code marketplace install support (.claude-plugin) #62

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