diff --git a/openhands/agenthub/codeact_agent/function_calling.py b/openhands/agenthub/codeact_agent/function_calling.py
index af07393dd4c3..08709c9ee526 100644
--- a/openhands/agenthub/codeact_agent/function_calling.py
+++ b/openhands/agenthub/codeact_agent/function_calling.py
@@ -80,7 +80,7 @@
     ),
 )
 
-_FILE_EDIT_DESCRIPTION = """Edit a file.
+_FILE_EDIT_DESCRIPTION = """Edit a file in plain-text format.
 * The assistant can edit files by specifying the file path and providing a draft of the new file content.
 * The draft content doesn't need to be exactly the same as the existing file; the assistant may skip unchanged lines using comments like `# unchanged` to indicate unchanged sections.
 * IMPORTANT: For large files (e.g., > 300 lines), specify the range of lines to edit using `start` and `end` (1-indexed, inclusive). The range should be smaller than 300 lines.
@@ -216,7 +216,7 @@ def __init__(self):
     ),
 )
 
-_STR_REPLACE_EDITOR_DESCRIPTION = """Custom editing tool for viewing, creating and editing files
+_STR_REPLACE_EDITOR_DESCRIPTION = """Custom editing tool for viewing, creating and editing files in plain-text format
 * State is persistent across command calls and discussions with the user
 * If `path` is a file, `view` displays the result of applying `cat -n`. If `path` is a directory, `view` lists non-hidden files and directories up to 2 levels deep
 * The `create` command cannot be used if the specified `path` already exists as a file