Add Perplexity MCP server definition

Official Perplexity AI MCP server with web search, deep research, and reasoning
capabilities. Uses @perplexity-ai/mcp-server npm package with stdio transport.

https://claude.ai/code/session_013AxurW8hPAfnUNvik354Xx

Author: its-mash

servers/ai.perplexity-mcp.json

@@ -0,0 +1,64 @@
+{
+  "$schema": "../schemas/server-definition.schema.json",
+  "id": "ai.perplexity-mcp",
+  "name": "Perplexity",
+  "alias": "perplexity",
+  "description": "AI-powered search using Perplexity models. Provides web search, deep research, and reasoning capabilities with real-time web context.",
+  "icon": "https://avatars.githubusercontent.com/u/185426709?v=4",
+  "schema_version": "2.1",
+  "categories": ["search", "ai-ml"],
+  "tags": ["perplexity", "search", "web-search", "research", "ai", "reasoning"],
+
+  "transport": {
+    "type": "stdio",
+    "command": "npx",
+    "args": ["-y", "@perplexity-ai/mcp-server"],
+    "env": {
+      "PERPLEXITY_API_KEY": "${input:PERPLEXITY_API_KEY}"
+    },
+    "metadata": {
+      "inputs": [
+        {
+          "id": "PERPLEXITY_API_KEY",
+          "label": "Perplexity API Key",
+          "description": "API key for the Perplexity API. Purchase credits at perplexity.ai/settings/api.",
+          "type": "password",
+          "required": true,
+          "secret": true,
+          "placeholder": "pplx-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
+          "obtain": {
+            "url": "https://www.perplexity.ai/settings/api",
+            "instructions": "1. Go to perplexity.ai/settings/api\n2. Add a payment method and purchase API credits\n3. Click '+ Generate' to create a new API key\n4. Copy the key",
+            "button_label": "Get API Key"
+          }
+        }
+      ]
+    }
+  },
+
+  "auth": {
+    "type": "api_key",
+    "instructions": "Get a Perplexity API key at https://www.perplexity.ai/settings/api"
+  },
+
+  "contributor": {
+    "name": "Perplexity AI",
+    "github": "perplexityai",
+    "url": "https://www.perplexity.ai"
+  },
+
+  "links": {
+    "repository": "https://github.com/perplexityai/modelcontextprotocol",
+    "homepage": "https://www.perplexity.ai",
+    "documentation": "https://docs.perplexity.ai/guides/mcp-server"
+  },
+
+  "platforms": ["all"],
+
+  "capabilities": {
+    "tools": true,
+    "resources": false,
+    "prompts": false,
+    "read_only_mode": true
+  }
+}