P0: Eliminate blocking I/O inside async tool execution

[galic1987]

Source

ChatGPT security review feedback

Problem

Blocking std::fs and std::io operations inside async fn execute in tools/file.rs and agent execution/checkpointing. This causes:

• Unstable multi-agent concurrency
• Potential deadlocks
• "It hangs sometimes" reputation damage

Fix

• For filesystem ops requiring sync-only crates (atomic tempfiles), wrap in tokio::task::spawn_blocking
• For everything else, move to tokio::fs and tokio::io
• Audit all async fn in src/tools/ and src/agent/ for blocking calls

Note: Some blocking I/O in context_management.rs and interactive.rs was already converted to tokio::fs in recent work. This issue tracks completing the job across all remaining call sites.

Priority

P0 — unlocks stable multi-agent concurrency

Labels

performance, P0