feat: enhance error handling in OAuth URL building and client creation; improve tool argument sanitization

src/app/subagent/engine.rs

@@ -5,6 +5,7 @@ use crate::tool::{all_tools, tool_defs, tool_is_risky};
 use super::context::SubagentContext;
 use super::event::SubagentEvent;
 
+#[allow(dead_code)]
 pub const MAX_AGENT_STEPS: usize = usize::MAX;
 
 /// Maps a subagent's allowed tool names to concrete Tool trait objects and
@@ -61,8 +62,7 @@ pub fn run_subagent(ctx: SubagentContext, tx: mpsc::Sender<SubagentEvent>) -> an
     let (tools, tdefs) = build_subagent_tools(&ctx.allowed_tools);
     let tdefs_opt: Option<Vec<ToolDef>> = if tdefs.is_empty() { None } else { Some(tdefs) };
 
-    let max_steps = ctx.max_steps.min(MAX_AGENT_STEPS);
-    for step in 0..max_steps {
+    for step in 0..ctx.max_steps {
         let (api_key, model, base_url) = resolve_provider_config();
         let client = crate::service::provider::LlmClient::new(api_key, model, base_url);