feat: add _meta maxResultSizeChars annotations for Claude Code large results

Upgrade swift-sdk 0.3.0 → 0.12.0 to get _meta support on Tool definitions.
Annotate all 293 tools with anthropic/maxResultSizeChars in tools/list response:
- 500K for analytics/report tools (TSV data, financials)
- 200K for list/search endpoints (reviews, builds, testers)
- 100K for single-item CRUD operations

Prevents Claude Code from truncating large MCP responses to disk.

Author: zelentsov-dev

Package.swift

@@ -12,7 +12,7 @@ let package = Package(
         .executable(name: "asc-mcp", targets: ["asc-mcp"])
     ],
     dependencies: [
-        .package(url: "https://github.com/modelcontextprotocol/swift-sdk.git", from: "0.3.0")
+        .package(url: "https://github.com/modelcontextprotocol/swift-sdk.git", from: "0.12.0")
     ],
     targets: [
         .executableTarget(

Sources/asc-mcp/Workers/MainWorker/WorkerManager.swift

@@ -258,9 +258,31 @@ public actor WorkerManager {
                 allTools += await self.getReviewAttachmentsTools()
             }
 
-            return ListTools.Result(tools: allTools)
+            // Annotate tools with maxResultSizeChars for Claude Code
+            let analyticsTools: Set<String> = [
+                "analytics_sales_report", "analytics_financial_report",
+                "analytics_get_report", "analytics_app_summary"
+            ]
+
+            let annotatedTools = allTools.map { tool -> Tool in
+                var modified = tool
+                let maxChars: Int
+                if analyticsTools.contains(tool.name) {
+                    maxChars = 500_000
+                } else if tool.name.contains("_list") || tool.name.contains("_search") {
+                    maxChars = 200_000
+                } else {
+                    maxChars = 100_000
+                }
+                modified._meta = Metadata(additionalFields: [
+                    "anthropic/maxResultSizeChars": .int(maxChars)
+                ])
+                return modified
+            }
+
+            return ListTools.Result(tools: annotatedTools)
         }
-        
+
         // Handler for all tool calls
         await server.withMethodHandler(CallTool.self) { params in
             do {