Add input validation to tailFile function

Copilot · elasticdotventures · Copilot · commit 8cd91f7cdb36 · 2026-01-25T01:21:28.000Z
Co-authored-by: elasticdotventures &lt;35611074+elasticdotventures@users.noreply.github.com&gt;
diff --git a/lib/mcp/server.js b/lib/mcp/server.js
@@ -361,6 +361,9 @@ function createTransport(options = {}) {
 }
 
 async function tailFile(filePath, lineCount) {
+  if (lineCount <= 0) {
+    throw new Error('lineCount must be positive');
+  }
   const fh = await fs.promises.open(filePath, 'r');
   try {
     const stats = await fh.stat();

Original file line number	Diff line number	Diff line change
`@@ -361,6 +361,9 @@ function createTransport(options = {}) {`
`361`	`361`	`}`
`362`	`362`
`363`	`363`	`async function tailFile(filePath, lineCount) {`
	`364`	`+ if (lineCount <= 0) {`
	`365`	`+ throw new Error('lineCount must be positive');`
	`366`	`+ }`
`364`	`367`	`const fh = await fs.promises.open(filePath, 'r');`
`365`	`368`	`try {`
`366`	`369`	`const stats = await fh.stat();`