Add get_vista tool for retrieving DevRev vista information (#30)

Summary
Adds a new "get_vista" tool to the DevRev MCP server that allows users
to retrieve vista (filtered view) information by ID.

Changes Made
- **New Tool**: Added "get_vista" tool with proper input schema
validation
- **Handler Implementation**: Complete tool handler with comprehensive
error handling
- **API Integration**: Uses existing `make_devrev_request` utility for
consistency
- **Search Enhancement**: Added "vista" namespace to search tool for
better vista discovery
https://app.devrev.ai/devrev/works/ISS-193339

---------

Co-authored-by: Anoushka Kumar <[email protected]>

Author: anoushkakumar321

src/devrev_mcp/server.py

@@ -30,6 +30,20 @@ async def handle_list_tools() -> list[types.Tool]:
             description="Fetch the current DevRev user details. When the user specifies 'me' in the query, this tool should be called to get the user details.",
             inputSchema={"type": "object", "properties": {}},
         ),
+         types.Tool(
+            name="get_vista",
+            description="Retrieve information about a vista in DevRev using its ID",
+            inputSchema={
+                "type": "object",
+                "properties": {
+                    "id": {
+                        "type": "string",
+                        "description": "The DevRev ID of the vista"
+                    }
+                 },
+                 "required": ["id"]
+            },
+         ),
         types.Tool(
             name="search",
             description="Search DevRev using the provided query",
@@ -39,7 +53,7 @@ async def handle_list_tools() -> list[types.Tool]:
                     "query": {"type": "string"},
                     "namespace": {
                         "type": "string", 
-                        "enum": ["article", "issue", "ticket", "part", "dev_user", "account", "rev_org"],
+                        "enum": ["article", "issue", "ticket", "part", "dev_user", "account", "rev_org", "vista"],
                         "description": "The namespace to search in. Use this to specify the type of object to search for."
                     },
                 },
@@ -439,6 +453,39 @@ async def handle_call_tool(
                 text=f"Current DevRev user details: {response.json()}"
             )
         ]
+    
+    elif name == "get_vista":
+        if not arguments:
+            raise ValueError("Missing arguments")
+
+        id = arguments.get("id")
+        if not id:
+            raise ValueError("Missing id ")
+            
+        response = make_devrev_request(
+            "vistas.get",
+            {
+                "id": id
+            }
+        )
+        
+        if response.status_code != 200:
+            error_text = response.text
+            return [
+                types.TextContent(
+                    type="text",
+                    text=f"get_vista failed with status {response.status_code}: {error_text}"
+                )
+            ]
+        
+        return [
+            types.TextContent(
+                type="text",
+                text=f"Vista details for '{id}':\n{response.json()}"
+            )
+        ]
+    
+
     elif name == "search":
         if not arguments:
             raise ValueError("Missing arguments")
@@ -547,6 +594,7 @@ async def handle_call_tool(
                 text=f"Object created successfully: {response.json()}"
             )
         ]
+    
     elif name == "update_work":
         if not arguments:
             raise ValueError("Missing arguments")