diff --git a/packages/opencode/src/tool/read.ts b/packages/opencode/src/tool/read.ts
index 27426ad2412..2b28bc37265 100644
--- a/packages/opencode/src/tool/read.ts
+++ b/packages/opencode/src/tool/read.ts
@@ -123,21 +123,24 @@ export const ReadTool = Tool.define("read", {
     const limit = params.limit ?? DEFAULT_READ_LIMIT
     const offset = params.offset || 0
     const lines = await file.text().then((text) => text.split("\n"))
+    const totalLines = lines.length
+    const lastReadLine = Math.min(offset + limit, totalLines)
+    const hasMoreLines = totalLines > lastReadLine
+
+    // Add line numbers only when paginating or when file is truncated
+    const shouldAddLineNumbers = params.offset !== undefined || params.limit !== undefined || hasMoreLines
+
     const raw = lines.slice(offset, offset + limit).map((line) => {
       return line.length > MAX_LINE_LENGTH ? line.substring(0, MAX_LINE_LENGTH) + "..." : line
     })
-    const content = raw.map((line, index) => {
-      return `${(index + offset + 1).toString().padStart(5, "0")}| ${line}`
-    })
+    const content = shouldAddLineNumbers
+      ? raw.map((line, index) => `${(index + offset + 1).toString().padStart(5, "0")}| ${line}`)
+      : raw
     const preview = raw.slice(0, 20).join("\n")
 
     let output = "<file>\n"
     output += content.join("\n")
 
-    const totalLines = lines.length
-    const lastReadLine = offset + content.length
-    const hasMoreLines = totalLines > lastReadLine
-
     if (hasMoreLines) {
       output += `\n\n(File has more lines. Use 'offset' parameter to read beyond line ${lastReadLine})`
     } else {
diff --git a/packages/opencode/src/tool/read.txt b/packages/opencode/src/tool/read.txt
index b5bffee263e..6b5ca1d1d2e 100644
--- a/packages/opencode/src/tool/read.txt
+++ b/packages/opencode/src/tool/read.txt
@@ -6,7 +6,7 @@ Usage:
 - By default, it reads up to 2000 lines starting from the beginning of the file
 - You can optionally specify a line offset and limit (especially handy for long files), but it's recommended to read the whole file by not providing these parameters
 - Any lines longer than 2000 characters will be truncated
-- Results are returned using cat -n format, with line numbers starting at 1
+- If passing offset or limit results are returned using cat -n format, with line numbers starting at 1
 - You have the capability to call multiple tools in a single response. It is always better to speculatively read multiple files as a batch that are potentially useful.
 - If you read a file that exists but has empty contents you will receive a system reminder warning in place of file contents.
 - You can read image files using this tool.