diff --git a/crates/ipu-codegen/src/package.rs b/crates/ipu-codegen/src/package.rs
index f2d1e34..29a290a 100644
--- a/crates/ipu-codegen/src/package.rs
+++ b/crates/ipu-codegen/src/package.rs
@@ -1282,6 +1282,28 @@ pub fn capture_exchange_finalist(
             .expanded_plan_finalists
             .max(planning.exchange_schedule_finalists),
     )?;
+    if let Some(directory) = std::env::var_os("DUMP_MID_ONLY") {
+        std::fs::create_dir_all(&directory).unwrap();
+        for (index, mid) in finalists.iter().enumerate() {
+            let mut text = String::new();
+            for op in &mid.operations {
+                text.push_str(&format!("{:?} {:?} {:?}\n", op.source, op.kind, crate::estimate::operation_cost(op, &mid.values)));
+                for id in op.inputs.iter().chain(&op.results) {
+                    text.push_str(&format!("  {:?}\n", mid.values[id.index() as usize]));
+                }
+            }
+            std::fs::write(std::path::Path::new(&directory).join(format!("mid-{index}.txt")), text).unwrap();
+        }
+        if std::env::var_os("SCREEN_MID").is_some() {
+            finalists.par_iter().enumerate().for_each(|(index, mid)| {
+                let start = std::time::Instant::now();
+                let result = crate::low::expand::expand_tiles(mid, false)
+                    .map(|low| crate::estimate::program_footprint(&low));
+                tracing::info!(index, ?result, elapsed_ms=start.elapsed().as_millis(), "diagnostic expanded footprint");
+            });
+        }
+        return Err(invalid("diagnostic mid dump complete"));
+    }
     let mid = finalists
         .get(finalist)
         .ok_or_else(|| invalid("exchange capture finalist out of range"))?;