diff --git a/packages/opencode/src/tool/edit.txt b/packages/opencode/src/tool/edit.txt
index 863efb8409c..f7de9b382e7 100644
--- a/packages/opencode/src/tool/edit.txt
+++ b/packages/opencode/src/tool/edit.txt
@@ -2,7 +2,14 @@ Performs exact string replacements in files.
 
 Usage:
 - You must use your `Read` tool at least once in the conversation before editing. This tool will error if you attempt an edit without reading the file. 
-- When editing text from Read tool output, ensure you preserve the exact indentation (tabs/spaces) as it appears AFTER the line number prefix. The line number prefix format is: spaces + line number + tab. Everything after that tab is the actual file content to match. Never include any part of the line number prefix in the oldString or newString.
+- When editing text from Read tool output, ensure you preserve the exact indentation (tabs/spaces) as it appears AFTER the `|` separator. The line number prefix format is: spaces + line number + tab. Everything after that `|` is the actual file content to match. Never include any part of the line number prefix in the oldString or newString.
+  - The format is: [line_number] |[actual_file_content]
+  - Everything before the `|` (including spaces) should be discarded
+  - Everything after the `|` (including ALL leading indentation) is the actual file content
+    Example:
+      42 |     function foo() {
+      ↑      ↑
+    metadata actual indentation (spaces/tabs to preserve)
 - ALWAYS prefer editing existing files in the codebase. NEVER write new files unless explicitly required.
 - Only use emojis if the user explicitly requests it. Avoid adding emojis to files unless asked.
 - The edit will FAIL if `oldString` is not found in the file with an error "oldString not found in content".
diff --git a/packages/opencode/src/tool/read.ts b/packages/opencode/src/tool/read.ts
index f230cdf44cb..e8ae062ed46 100644
--- a/packages/opencode/src/tool/read.ts
+++ b/packages/opencode/src/tool/read.ts
@@ -112,7 +112,7 @@ export const ReadTool = Tool.define("read", {
     }
 
     const content = raw.map((line, index) => {
-      return `${(index + offset + 1).toString().padStart(5, "0")}| ${line}`
+      return `${(index + offset + 1).toString().padStart(5, "0")} |${line}`
     })
     const preview = raw.slice(0, 20).join("\n")