Add preventShellHistory feature

[Tyriar]

Fixes #276716

Verified:

• Windows/pwsh 5
• Windows/pwsh 7
• mac/zsh 5.9
• mac/bash 3.2.57
• mac/fish 3.7.1

[Copilot]

Pull request overview

This PR adds a new preventShellHistory feature to prevent AI-executed terminal commands from being saved in the user's shell history. The implementation prefixes commands with a space and configures shells to ignore space-prefixed commands.

Key Changes

• Adds a new PreventShellHistory configuration setting (default: true) that controls whether commands executed by the terminal tool are excluded from shell history
• Implements space-prefixing of commands across all execution strategies and the background terminal execution
• Adds shell integration script modifications to configure bash, zsh, fish, and PowerShell to ignore space-prefixed commands

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
terminalChatAgentToolsConfiguration.ts	Adds the PreventShellHistory configuration setting with markdown description
runInTerminalTool.ts	Adds preventShellHistory parameter to BackgroundTerminalExecution and prefixes commands with space when enabled
toolTerminalCreator.ts	Sets VSCODE_EXCLUDE_FROM_HISTORY environment variable for supported shells when feature is enabled
richExecuteStrategy.ts	Reads configuration and prefixes commands with space before execution
noneExecuteStrategy.ts	Reads configuration and prefixes commands with space before execution
basicExecuteStrategy.ts	Reads configuration and prefixes commands with space before execution
shellIntegration.ps1	Configures PSReadLine's AddToHistoryHandler to ignore space-prefixed commands
shellIntegration.fish	Enables fish_private_mode when VSCODE_EXCLUDE_FROM_HISTORY is set
shellIntegration-rc.zsh	Sets HIST_IGNORE_SPACE option when VSCODE_EXCLUDE_FROM_HISTORY is set
shellIntegration-bash.sh	Sets HISTCONTROL=ignorespace when VSCODE_EXCLUDE_FROM_HISTORY is set

[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 5 comments.

[anthonykim1]

this is pretty cool 🚀