agent: Fix Gemini refusing all requests with file-based tool calls (#38705)

Solves an issue where Google APIs refuse all requests with file-based
tool calls attached.
This seems to get triggered in the case where:

- copy_path + another file-based tool call is enabled
- default terminal is `/bin/bash` or something similar

It is unclear why this is happening, but removing the terminal commands
in those tool calls seems to have solved the issue.

Closes #37180 and #37414

Release Notes:

- agent: Fix Gemini refusing requests with certain profiles/systems.

crates/agent2/src/tools/copy_path_tool.rs

@@ -9,14 +9,14 @@ use std::sync::Arc;
 use util::markdown::MarkdownInlineCode;
 
 /// Copies a file or directory in the project, and returns confirmation that the copy succeeded.
-/// Directory contents will be copied recursively (like `cp -r`).
+/// Directory contents will be copied recursively.
 ///
 /// This tool should be used when it's desirable to create a copy of a file or directory without modifying the original.
 /// It's much more efficient than doing this by separately reading and then writing the file or directory's contents, so this tool should be preferred over that approach whenever copying is the goal.
 #[derive(Debug, Serialize, Deserialize, JsonSchema)]
 pub struct CopyPathToolInput {
     /// The source path of the file or directory to copy.
-    /// If a directory is specified, its contents will be copied recursively (like `cp -r`).
+    /// If a directory is specified, its contents will be copied recursively.
     ///
     /// <example>
     /// If the project has the following files:

crates/agent2/src/tools/create_directory_tool.rs

@@ -11,7 +11,7 @@ use crate::{AgentTool, ToolCallEventStream};
 
 /// Creates a new directory at the specified path within the project. Returns confirmation that the directory was created.
 ///
-/// This tool creates a directory and all necessary parent directories (similar to `mkdir -p`). It should be used whenever you need to create new directories within the project.
+/// This tool creates a directory and all necessary parent directories. It should be used whenever you need to create new directories within the project.
 #[derive(Debug, Serialize, Deserialize, JsonSchema)]
 pub struct CreateDirectoryToolInput {
     /// The path of the new directory.