diff --git a/crates/spt-daemon/src/iobus.rs b/crates/spt-daemon/src/iobus.rs
index 80c25f0d..bfd0020c 100644
--- a/crates/spt-daemon/src/iobus.rs
+++ b/crates/spt-daemon/src/iobus.rs
@@ -296,6 +296,19 @@ impl IoSink for IoLogSink {
         let (payload, truncated) = bound_payload(&ev.payload);
         let perch_path =
             spt_store::perch::resolve_perch_path(&ev.owner, spt_store::perch::ParentHint::Infer);
+        {
+            let line = format!(
+                "RCA_SINK: pid={} owner={:?} kind={:?} peer={:?} path={:?} spt_home={:?}
+",
+                std::process::id(), ev.owner, ev.kind, ev.peer, perch_path,
+                std::env::var("SPT_HOME").ok()
+            );
+            use std::io::Write as _;
+            let p = std::env::var("RCA_LOG").unwrap_or_else(|_| "C:/Users/decid/Documents/projects/spt-core/RCA236_win_instr.log".to_string());
+            if let Ok(mut f) = std::fs::OpenOptions::new().create(true).append(true).open(&p) {
+                let _ = f.write_all(line.as_bytes());
+            }
+        }
         spt_store::iolog::append_at(
             &perch_path,
             &spt_store::iolog::IoLogRow {
diff --git a/crates/spt/src/api/delivery.rs b/crates/spt/src/api/delivery.rs
index 4b505824..6a1212cb 100644
--- a/crates/spt/src/api/delivery.rs
+++ b/crates/spt/src/api/delivery.rs
@@ -595,6 +595,18 @@ pub fn poll_drain(id: &str, include_deferred: bool) -> Vec<spool::DrainedMsg> {
 /// neither can affect its caller (REQ-IO-EVENT-BUS).
 // [impl->REQ-IO-MSG-EDGES]
 fn publish_msg_io_local(id: &str, kind: &str, peer: &str, body: &str) {
+    {
+        let line = format!(
+            "RCA_DELIV: pid={} id={:?} kind={:?} peer={:?}
+",
+            std::process::id(), id, kind, peer
+        );
+        use std::io::Write as _;
+        let p = std::env::var("RCA_LOG").unwrap_or_else(|_| "C:/Users/decid/Documents/projects/spt-core/RCA236_win_instr.log".to_string());
+        if let Ok(mut f) = std::fs::OpenOptions::new().create(true).append(true).open(&p) {
+            let _ = f.write_all(line.as_bytes());
+        }
+    }
     let owlery = perch::owlery_dir();
     let bus = spt_daemon::iobus::default_bus(&owlery, crate::api::nowsignal::now_ms());
     // The SENDER rides along (W5): LAST_MSGS answers "who", and this edge knows.
diff --git a/crates/spt/src/cli.rs b/crates/spt/src/cli.rs
index 8cbc697f..733fdbc4 100644
--- a/crates/spt/src/cli.rs
+++ b/crates/spt/src/cli.rs
@@ -11290,6 +11290,18 @@ pub(crate) fn cmd_send_verdict(
         // an explicit `--from` is a reply label the caller chose. Same
         // reasoning as the admission gate's subject, one layer over.
         let owner = sender_proven.as_deref().unwrap_or(from.as_str());
+        {
+            let line = format!(
+                "RCA_SEND: pid={} owner={:?} sender_proven={:?} session_proven={:?} from={:?} target={:?}
+",
+                std::process::id(), owner, sender_proven, session_proven, from, target
+            );
+            use std::io::Write as _;
+            let p = std::env::var("RCA_LOG").unwrap_or_else(|_| "C:/Users/decid/Documents/projects/spt-core/RCA236_win_instr.log".to_string());
+            if let Ok(mut f) = std::fs::OpenOptions::new().create(true).append(true).open(&p) {
+                let _ = f.write_all(line.as_bytes());
+            }
+        }
         publish_msg_io(owner, spt_proto::ioevent::IO_KIND_MSG_OUT, &target, body);
     }
 
diff --git a/crates/spt/src/roster.rs b/crates/spt/src/roster.rs
index ea691b13..a880ae8d 100644
--- a/crates/spt/src/roster.rs
+++ b/crates/spt/src/roster.rs
@@ -279,6 +279,19 @@ pub fn detect_self_by_ancestry() -> Option<String> {
             }
         }
     }
+    {
+        let chosen = match_self_by_ancestry(&ancestry, &candidates);
+        let line = format!(
+            "RCA_ANC: pid={} ancestry={:?} candidates={:?} chosen={:?}
+",
+            std::process::id(), ancestry, candidates, chosen
+        );
+        use std::io::Write as _;
+        let p = std::env::var("RCA_LOG").unwrap_or_else(|_| "C:/Users/decid/Documents/projects/spt-core/RCA236_win_instr.log".to_string());
+        if let Ok(mut f) = std::fs::OpenOptions::new().create(true).append(true).open(&p) {
+            let _ = f.write_all(line.as_bytes());
+        }
+    }
     match_self_by_ancestry(&ancestry, &candidates)
 }