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core: add a feature to disable the shell tool (#6481)

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`--disable shell_tool` disables the built-in shell tool. This is useful
for MCP-only operation.

---------

Co-authored-by: Michael Bolin <mbolin@openai.com>
This commit is contained in:
Jeremy Rose
2025-11-17 14:56:19 -08:00
committed by GitHub
parent daf77b8452
commit ab2e7499f8
2 changed files with 27 additions and 6 deletions
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25
codex-rs/core/src/tools/spec.rs
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@@ -20,6 +20,11 @@ pub enum ConfigShellToolType {
Default,
Local,
UnifiedExec,
/// Do not include a shell tool by default. Useful when using Codex
/// with tools provided exclusively provided by MCP servers. Often used
/// with `--config base_instructions=CUSTOM_INSTRUCTIONS`
/// to customize agent behavior.
Disabled,
/// Takes a command as a single string to be run in the user's default shell.
ShellCommand,
}
@@ -48,7 +53,9 @@ impl ToolsConfig {
let include_web_search_request = features.enabled(Feature::WebSearchRequest);
let include_view_image_tool = features.enabled(Feature::ViewImageTool);
let shell_type = if features.enabled(Feature::UnifiedExec) {
let shell_type = if !features.enabled(Feature::ShellTool) {
ConfigShellToolType::Disabled
} else if features.enabled(Feature::UnifiedExec) {
ConfigShellToolType::UnifiedExec
} else if features.enabled(Feature::ShellCommandTool) {
ConfigShellToolType::ShellCommand
@@ -1006,16 +1013,21 @@ pub(crate) fn build_specs(
builder.register_handler("exec_command", unified_exec_handler.clone());
builder.register_handler("write_stdin", unified_exec_handler);
}
ConfigShellToolType::Disabled => {
// Do nothing.
}
ConfigShellToolType::ShellCommand => {
builder.push_spec(create_shell_command_tool());
}
}
// Always register shell aliases so older prompts remain compatible.
builder.register_handler("shell", shell_handler.clone());
builder.register_handler("container.exec", shell_handler.clone());
builder.register_handler("local_shell", shell_handler);
builder.register_handler("shell_command", shell_command_handler);
if config.shell_type != ConfigShellToolType::Disabled {
// Always register shell aliases so older prompts remain compatible.
builder.register_handler("shell", shell_handler.clone());
builder.register_handler("container.exec", shell_handler.clone());
builder.register_handler("local_shell", shell_handler);
builder.register_handler("shell_command", shell_command_handler);
}
builder.push_spec_with_parallel_support(create_list_mcp_resources_tool(), true);
builder.push_spec_with_parallel_support(create_list_mcp_resource_templates_tool(), true);
@@ -1151,6 +1163,7 @@ mod tests {
ConfigShellToolType::Default => Some("shell"),
ConfigShellToolType::Local => Some("local_shell"),
ConfigShellToolType::UnifiedExec => None,
ConfigShellToolType::Disabled => None,
ConfigShellToolType::ShellCommand => Some("shell_command"),
}
}