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fix: treat empty string as unset for chat.defaultAgent setting #7

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fix: treat empty string as unset for chat.defaultAgent setting #7

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62 changes: 48 additions & 14 deletions crates/chat-cli/src/cli/agent/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -668,21 +668,24 @@ impl Agents {
}

if let Some(user_set_default) = os.database.settings.get_string(Setting::ChatDefaultAgent) {
if all_agents.iter().any(|a| a.name == user_set_default) {
break 'active_idx user_set_default;
// Treat empty strings as "no default set" to allow clean reset
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@amazon-q-developer amazon-q-developer bot Sep 27, 2025

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The fix correctly addresses the issue described in the PR. The change from checking if user_set_default exists to also checking !user_set_default.is_empty() properly treats empty strings as "no default set".

This resolves the problem where q settings chat.defaultAgent "" would store an empty string in the database, which get_string() returns as Some(""), causing the agent selection logic to try finding an agent with an empty name and display the error message.

The fix is minimal, targeted, and maintains backward compatibility while enabling the documented behavior of using empty strings to reset to the built-in default agent.

if !user_set_default.is_empty() {
if all_agents.iter().any(|a| a.name == user_set_default) {
break 'active_idx user_set_default;
}
let _ = queue!(
output,
style::SetForegroundColor(Color::Red),
style::Print("Error"),
style::SetForegroundColor(Color::Yellow),
style::Print(format!(
": user defined default {} not found. Falling back to in-memory default",
user_set_default
)),
style::Print("\n"),
style::SetForegroundColor(Color::Reset)
);
}
let _ = queue!(
output,
style::SetForegroundColor(Color::Red),
style::Print("Error"),
style::SetForegroundColor(Color::Yellow),
style::Print(format!(
": user defined default {} not found. Falling back to in-memory default",
user_set_default
)),
style::Print("\n"),
style::SetForegroundColor(Color::Reset)
);
}

all_agents.push({
Expand Down Expand Up @@ -1402,4 +1405,35 @@ mod tests {
}
}
}

#[test]
fn test_empty_default_agent_setting() {
use crate::database::settings::{Setting, Settings};
use std::collections::HashMap;

// Test that empty string is treated as "no default set"
let mut settings_map = HashMap::new();
settings_map.insert(Setting::ChatDefaultAgent.to_string(), serde_json::Value::String("".to_string()));
let settings = Settings::from_map(settings_map);

// get_string should return Some("") for empty string
let result = settings.get_string(Setting::ChatDefaultAgent);
assert_eq!(result, Some("".to_string()));

// The fix should treat this as "no default set" by checking !user_set_default.is_empty()
// This test documents the expected behavior: empty strings should be ignored
let empty_string = result.unwrap();
assert!(empty_string.is_empty(), "Empty string should be detected as empty");

// Test non-empty string still works
let mut settings_map = HashMap::new();
settings_map.insert(Setting::ChatDefaultAgent.to_string(), serde_json::Value::String("my-agent".to_string()));
let settings = Settings::from_map(settings_map);

let result = settings.get_string(Setting::ChatDefaultAgent);
assert_eq!(result, Some("my-agent".to_string()));

let non_empty_string = result.unwrap();
Comment on lines +1418 to +1436
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@amazon-q-developer amazon-q-developer bot Sep 27, 2025

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Good test coverage for the fix! The test properly validates:

  1. Empty string settings are correctly retrieved as Some("") from the database
  2. The fix logic correctly identifies empty strings with is_empty()
  3. Non-empty strings continue to work as expected

This test ensures the fix works correctly and prevents regression of the issue.

assert!(!non_empty_string.is_empty(), "Non-empty string should not be empty");
}
}
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