diff --git a/apps/solvecraft-cli/src/oracle.rs b/apps/solvecraft-cli/src/oracle.rs
index 9052410e..7ebf37d9 100644
--- a/apps/solvecraft-cli/src/oracle.rs
+++ b/apps/solvecraft-cli/src/oracle.rs
@@ -65,6 +65,19 @@ fn check_case(dir: &str) -> Value {
     if let Some((_, _, why)) = approx {
         out["note"] = json!(why);
     }
+    let effective: Vec<String> = recipe["features"]
+        .as_array()
+        .into_iter()
+        .flatten()
+        .filter(|f| f.get("fusion_effective_extent").is_some())
+        .map(|f| f["name"].as_str().unwrap_or("?").to_string())
+        .collect();
+    if !effective.is_empty() {
+        out["note"] = json!(format!(
+            "known Fusion difference: {} replayed with the extent Fusion actually used (its through-all is sized as 1.1 × the farthest vertex, so curved tops stop it short; SolveCraft's through-all goes truly through)",
+            effective.join(", ")
+        ));
+    }
     out
 }
 
diff --git a/apps/solvecraft-cli/src/recipe.rs b/apps/solvecraft-cli/src/recipe.rs
index 727660b8..706bc8e0 100644
--- a/apps/solvecraft-cli/src/recipe.rs
+++ b/apps/solvecraft-cli/src/recipe.rs
@@ -85,6 +85,14 @@ fn sketch_cmds(f: &Value, out: &mut Vec<Value>) -> Result<(), String> {
 
 /// Extent parameters for the Extrude command.
 fn extent(f: &Value, p: &mut Value) {
+    // Where Fusion's own result differs from the geometric meaning (its through-all is sized
+    // from vertices), the recipe records the extent Fusion actually used: replay that.
+    if let Some(fx) = f.get("fusion_effective_extent").filter(|x| x.get("type").and_then(Value::as_str) == Some("distance")) {
+        let dir = fx.get("direction").and_then(Value::as_str).unwrap_or("positive");
+        p["distance"] = fx.get("distance").cloned().unwrap_or(Value::Null);
+        p["direction"] = json!(if dir.starts_with("negative") { "negative" } else { "positive" });
+        return;
+    }
     let e = f.get("extent").cloned().unwrap_or(Value::Null);
     let ty = e.get("type").and_then(Value::as_str).unwrap_or("distance");
     let dist = e.get("distance").cloned().or_else(|| f.get("distance").cloned()).unwrap_or(Value::Null);
diff --git a/xtask/src/main.rs b/xtask/src/main.rs
index d1b190e8..7b33570c 100644
--- a/xtask/src/main.rs
+++ b/xtask/src/main.rs
@@ -160,6 +160,9 @@ fn cmd_oracle() -> Result<(), String> {
         if let Some(e) = r["error"].as_str() {
             notes.push(e.replace('|', "/"));
         }
+        if let Some(n) = r["note"].as_str() {
+            notes.push(n.replace('|', "/"));
+        }
         md += &format!("| {} | {status} | {} |\n", r["case"].as_str().unwrap_or(""), notes.join("; "));
     }
     std::fs::write(root().join("docs/oracle.md"), md).map_err(|e| format!("docs/oracle.md: {e}"))?;