feat: Add Claude Code plugin for Atlan MCP server

[abhinavmathur-atlan]

Summary

Adds a Claude Code plugin for the Atlan MCP server, enabling AI-assisted data governance workflows directly in Claude Code. The plugin connects to mcp.atlan.com/mcp via OAuth 2.1 — no API keys or local setup required.

What's included

MCP Server Config — auto-connects to https://mcp.atlan.com/mcp with OAuth authentication.

CLAUDE.md — conventions and guidelines for Claude to use Atlan tools effectively.

Marketplace Config — installable via Claude Code's plugin marketplace system.

MCP Tools (15)

Enabled by default (12):

Tool	Category
semantic_search_tool	Search & Discovery
traverse_lineage_tool	Lineage
update_assets_tool	Asset Management
create_glossaries	Glossary
create_glossary_terms	Glossary
create_glossary_categories	Glossary
create_domains	Data Mesh
create_data_products	Data Mesh
create_dq_rules_tool	Data Quality
update_dq_rules_tool	Data Quality
schedule_dq_rules_tool	Data Quality
delete_dq_rules_tool	Data Quality

Available via feature flag (3):
search_assets_tool, get_assets_by_dsl_tool, query_assets_tool

Files added

claude-plugin/
├── .claude-plugin/
│   ├── plugin.json          # Plugin manifest
│   └── marketplace.json     # Marketplace catalog
├── .mcp.json                # Remote MCP server config (OAuth)
├── CLAUDE.md                # Instructions for Claude
├── README.md
├── LICENSE (Apache-2.0)
└── CHANGELOG.md

Installation

# Add marketplace (one-time)
claude plugin marketplace add atlanhq/agent-toolkit

# Install plugin
claude plugin install atlan@atlan-marketplace

# Authenticate (interactive — opens browser)
/mcp

Test plan

• claude plugin validate ./claude-plugin — passes
• claude --plugin-dir ./claude-plugin — plugin loads correctly
• claude plugin marketplace add — marketplace registers successfully
• claude plugin install atlan@atlan-marketplace — installs and shows ✔ enabled
• claude plugin list — shows atlan@atlan-marketplace with status ✔ enabled
• OAuth authentication via /mcp in interactive session (requires browser)

🤖 Generated with Claude Code