diff --git a/src/remark-if.ts b/src/remark-if.ts
new file mode 100644
index 00000000..23c3e144
--- /dev/null
+++ b/src/remark-if.ts
@@ -0,0 +1,136 @@
+import type { Parent, Root } from "mdast";
+import type { ContainerDirective } from "mdast-util-directive";
+import type { Plugin } from "unified";
+import type { Node } from "unist";
+import { SKIP, visit } from "unist-util-visit";
+
+interface RemarkIfOptions {
+  /**
+   * The current mode to use for filtering content.
+   * Content with a different mode will be removed.
+   */
+  mode?: string;
+}
+
+interface DirectiveNode extends ContainerDirective {
+  attributes?: {
+    mode?: string;
+  };
+}
+
+/**
+ * A remark plugin that filters out content based on the mode attribute.
+ *
+ * Syntax: `::if{mode=opensource}...content...::`
+ *
+ * If the mode matches the configured mode, the content is kept (but the directive wrapper is removed).
+ * If the mode doesn't match, the entire directive and its content is removed.
+ *
+ * @example
+ * ```ts
+ * import { remarkIf } from './remark-if.js';
+ *
+ * export default {
+ *   // cSpell:ignore opensource
+ *   remarkPlugins: [[remarkIf, { mode: 'opensource' }]],
+ * };
+ * ```
+ */
+export const remarkIf: Plugin<[RemarkIfOptions?], Root> = (options = {}) => {
+  return (tree: Root) => {
+    visit(tree, (node: Node, index?: number, parent?: Parent) => {
+      // Handle both containerDirective (:::) and leafDirective (::) with name "if"
+      if (
+        (node.type !== "containerDirective" && node.type !== "leafDirective") ||
+        (node as DirectiveNode).name !== "if" ||
+        parent == null ||
+        index == null
+      ) {
+        return;
+      }
+
+      const directive = node as DirectiveNode;
+
+      // Get the mode attribute from the directive
+      const modeAttribute = directive.attributes?.mode;
+
+      // Find the closing "::" marker (for leafDirective) or handle containerDirective
+      const isLeafDirective = node.type === "leafDirective";
+      let closingIndex = -1;
+
+      if (isLeafDirective) {
+        // For leaf directives, find the paragraph containing only "::"
+        for (let i = index + 1; i < parent.children.length; i++) {
+          const nextNode = parent.children[i];
+          if (nextNode.type !== "paragraph" || !("children" in nextNode)) {
+            continue;
+          }
+          const firstChild = nextNode.children?.[0];
+          if (
+            nextNode.children?.length === 1 &&
+            firstChild &&
+            firstChild.type === "text" &&
+            "value" in firstChild &&
+            typeof firstChild.value === "string" &&
+            firstChild.value.trim() === "::"
+          ) {
+            closingIndex = i;
+            break;
+          }
+        }
+
+        // Fail if no closing "::" was found for leaf directive
+        if (closingIndex === -1) {
+          const position = directive.position
+            ? ` at line ${directive.position.start.line}`
+            : "";
+          throw new Error(
+            `Unclosed ::if directive${position}. Leaf directives (::if) must be closed with a matching "::".`,
+          );
+        }
+      }
+
+      if (!modeAttribute) {
+        // If no mode attribute, keep the content but remove the directive wrapper
+        if (isLeafDirective && closingIndex > -1) {
+          // Remove the closing "::" and the directive, keep content in between
+          parent.children.splice(closingIndex, 1);
+          parent.children.splice(index, 1);
+          return [SKIP, index];
+        } else if (directive.children && directive.children.length > 0) {
+          parent.children.splice(index, 1, ...directive.children);
+          return [SKIP, index];
+        } else {
+          parent.children.splice(index, 1);
+          return [SKIP, index];
+        }
+      }
+
+      // If the mode matches, keep the content but remove the directive wrapper and closing "::"
+      if (modeAttribute === options.mode) {
+        if (isLeafDirective && closingIndex > -1) {
+          // Remove the closing "::" and the directive, keep content in between
+          parent.children.splice(closingIndex, 1);
+          parent.children.splice(index, 1);
+          return [SKIP, index];
+        } else if (directive.children && directive.children.length > 0) {
+          parent.children.splice(index, 1, ...directive.children);
+          return [SKIP, index];
+        } else {
+          parent.children.splice(index, 1);
+          return [SKIP, index];
+        }
+      }
+
+      // If the mode doesn't match, remove the directive and all content until the closing "::"
+      if (isLeafDirective && closingIndex > -1) {
+        // Remove from directive to closing "::" (inclusive)
+        parent.children.splice(index, closingIndex - index + 1);
+      } else {
+        // For container directives or when no closing found, just remove the directive
+        parent.children.splice(index, 1);
+      }
+      return [SKIP, index];
+    });
+  };
+};
diff --git a/vercel.json b/vercel.json
index b6b90834..0af5fa35 100644
--- a/vercel.json
+++ b/vercel.json
@@ -1270,7 +1270,7 @@
     },
     {
       "source": "/docs/mcp-server/mcp-server{/}?",
-      "destination": "/mcp-server/introduction",
+      "destination": "/docs/mcp-server/introduction",
       "permanent": true
     },
     {
@@ -1283,10 +1283,20 @@
       "destination": "/docs/mcp-server/tools",
       "permanent": true
     },
+    {
+      "source": "/docs/handlers/mcp-server-custom-tools{/}?",
+      "destination": "/docs/mcp-server/custom-tools",
+      "permanent": true
+    },
     {
       "source": "/docs/handlers/mcp-server-resources{/}?",
       "destination": "/docs/mcp-server/resources",
       "permanent": true
+    },
+    {
+      "source": "/docs/handlers/mcp-server-prompts{/}?",
+      "destination": "/docs/mcp-server/prompts",
+      "permanent": true
     }
   ],
   "rewrites": [
diff --git a/zudoku.build.ts b/zudoku.build.ts
index 942e07b2..6ad5ac89 100644
--- a/zudoku.build.ts
+++ b/zudoku.build.ts
@@ -1,6 +1,13 @@
 import { removeExtensions } from "zudoku/processors/removeExtensions";
 import type { ZudokuBuildConfig } from "zudoku";
+import type { PluggableList } from "unified";
+import { remarkIf } from "./src/remark-if.js";
+
 const buildConfig: ZudokuBuildConfig = {
+  remarkPlugins: (defaultPlugins: PluggableList) => [
+    ...defaultPlugins,
+    [remarkIf, { mode: "zuplo" }],
+  ],
   processors: [
     // Remove specific extensions
     removeExtensions({