chore: import upstream snapshot with attribution

pkg/context/mcp_info.go

@@ -0,0 +1,39 @@
+package context
+
+import "context"
+
+type mcpMethodInfoCtx string
+
+var mcpMethodInfoCtxKey mcpMethodInfoCtx = "mcpmethodinfo"
+
+// MCPMethodInfo contains pre-parsed MCP method information extracted from the JSON-RPC request.
+// This is populated early in the request lifecycle to enable:
+//   - Inventory filtering via ForMCPRequest (only register needed tools/resources/prompts)
+//   - Avoiding duplicate JSON parsing in middlewares (secret-scanning, scope-challenge)
+//   - Performance optimization for per-request server creation
+type MCPMethodInfo struct {
+	// Method is the MCP method being called (e.g., "tools/call", "tools/list", "initialize")
+	Method string
+	// ItemName is the name of the specific item being accessed (tool name, resource URI, prompt name)
+	// Only populated for call/get methods (tools/call, prompts/get, resources/read)
+	ItemName string
+	// Owner is the repository owner from tool call arguments, if present
+	Owner string
+	// Repo is the repository name from tool call arguments, if present
+	Repo string
+	// Arguments contains the raw tool arguments for tools/call requests
+	Arguments map[string]any
+}
+
+// WithMCPMethodInfo stores the MCPMethodInfo in the context.
+func WithMCPMethodInfo(ctx context.Context, info *MCPMethodInfo) context.Context {
+	return context.WithValue(ctx, mcpMethodInfoCtxKey, info)
+}
+
+// MCPMethod retrieves the MCPMethodInfo from the context.
+func MCPMethod(ctx context.Context) (*MCPMethodInfo, bool) {
+	if info, ok := ctx.Value(mcpMethodInfoCtxKey).(*MCPMethodInfo); ok {
+		return info, true
+	}
+	return nil, false
+}