diff --git a/.claude-plugin/marketplace.json b/.claude-plugin/marketplace.json
index f9411c3..0cf9b18 100644
--- a/.claude-plugin/marketplace.json
+++ b/.claude-plugin/marketplace.json
@@ -147,6 +147,13 @@
       "description": "Medidata's MCP Connector for Claude with Platform Help and Predictive Site Ranking for clinical trials",
       "category": "life-sciences",
       "tags": ["clinical-trials", "site-ranking", "trial-planning", "medidata"]
+    },
+    {
+      "name": "msds-chain",
+      "source": "./msds-chain",
+      "description": "Chemical safety intelligence — compatibility checks, hazard analysis, PPE, storage, waste disposal, mixing order, regulatory compliance, and signed audit reports",
+      "category": "life-sciences",
+      "tags": ["chemistry", "safety", "msds", "sds", "ghs", "compliance", "ehs", "lab-automation"]
     }
   ]
 }
diff --git a/msds-chain/.claude-plugin/plugin.json b/msds-chain/.claude-plugin/plugin.json
new file mode 100644
index 0000000..ddbbdc5
--- /dev/null
+++ b/msds-chain/.claude-plugin/plugin.json
@@ -0,0 +1,15 @@
+{
+  "name": "msds-chain",
+  "version": "1.0.0",
+  "description": "Chemical safety intelligence for AI-assisted experiment design. MSDS Chain provides 18 tools for pairwise compatibility checks, GHS hazard analysis, PPE recommendations, storage guidance, waste disposal, mixing order safety, occupational exposure limits, transport classification, multi-region regulatory compliance (EU/US/CN/JP/KR/CA/AU/TW), safer chemical alternatives, protocol text parsing, SDS section lookup, and signed audit reports with Ed25519 receipts.",
+  "author": {
+    "name": "LAgentBot Pte. Ltd.",
+    "url": "https://msdschain.lagentbot.com"
+  },
+  "mcpServers": {
+    "msds-chain": {
+      "type": "http",
+      "url": "https://mcp.lagentbot.com/mcp"
+    }
+  }
+}