From 264dcc072c8a142f2e4ce5061eb5e311ef4ed15c Mon Sep 17 00:00:00 2001
From: Shawn Morreau <shawn@arktype.io>
Date: Fri, 21 Nov 2025 14:08:36 -0500
Subject: [PATCH] remove stdout interception logic

---
 mcp/arkConfig.ts |  2 +-
 mcp/server.ts    | 56 ------------------------------------------------
 2 files changed, 1 insertion(+), 57 deletions(-)

diff --git a/mcp/arkConfig.ts b/mcp/arkConfig.ts
index c9cfb15..8128d85 100644
--- a/mcp/arkConfig.ts
+++ b/mcp/arkConfig.ts
@@ -2,6 +2,6 @@ import { configure } from "arktype/config";
 
 configure({
   toJsonSchema: {
-    // dialect: null,
+    dialect: null,
   },
 });
diff --git a/mcp/server.ts b/mcp/server.ts
index 9917252..cfa8ab8 100644
--- a/mcp/server.ts
+++ b/mcp/server.ts
@@ -37,60 +37,4 @@ addTools(server, [
   GetCheckSuiteLogsTool,
 ]);
 
-// intercept stdout to remove $schema fields from JSON-RPC messages
-// FastMCP uses stdout for JSON-RPC communication, so we intercept here
-const originalStdoutWrite = process.stdout.write.bind(process.stdout);
-process.stdout.write = function (chunk: any, encoding?: any, cb?: any): boolean {
-  if (typeof chunk === "string" || Buffer.isBuffer(chunk)) {
-    try {
-      const text = typeof chunk === "string" ? chunk : chunk.toString("utf-8");
-      // MCP uses JSON-RPC over stdio, messages are JSON objects on single lines
-      const lines = text.split("\n");
-      const modifiedLines = lines.map((line) => {
-        const trimmed = line.trim();
-        // only process lines that look like JSON-RPC messages
-        if (trimmed.startsWith("{") && trimmed.includes('"jsonrpc"')) {
-          try {
-            const parsed = JSON.parse(trimmed);
-            // recursively remove $schema fields from the message
-            const cleaned = removeSchemaFields(parsed);
-            return JSON.stringify(cleaned) + "\n";
-          } catch {
-            // if parsing fails, return original line
-            return line + (line.endsWith("\n") ? "" : "\n");
-          }
-        }
-        return line + (line.endsWith("\n") ? "" : "\n");
-      });
-      const result = modifiedLines.join("");
-      return originalStdoutWrite(result, encoding, cb);
-    } catch {
-      // if anything fails, just pass through
-    }
-  }
-  return originalStdoutWrite(chunk, encoding, cb);
-};
-
-// recursively remove $schema fields from JSON objects
-function removeSchemaFields(obj: any): any {
-  if (obj === null || typeof obj !== "object") {
-    return obj;
-  }
-
-  if (Array.isArray(obj)) {
-    return obj.map(removeSchemaFields);
-  }
-
-  const result: any = {};
-  for (const [key, value] of Object.entries(obj)) {
-    // skip $schema fields
-    if (key === "$schema") {
-      continue;
-    }
-    result[key] = removeSchemaFields(value);
-  }
-
-  return result;
-}
-
 server.start();