diff --git a/.config/kak/scripts/lsp-diags.py b/.config/kak/scripts/lsp-diags.py
index 77a628dd..5f8a2032 100755
--- a/.config/kak/scripts/lsp-diags.py
+++ b/.config/kak/scripts/lsp-diags.py
@@ -1,11 +1,16 @@
 #!/usr/bin/env python
 
+import sys
+import os
+
 Position = tuple[int, int]
 SpecList = list[tuple[Position, Position]]
 
+diagnostics: SpecList = []
+
 
 def parse_specs(data: str):
-    diagnostics: SpecList = []
+    parsed: SpecList = []
     for entry in data.strip().split():
         if not entry or len(entry) < 9:
             continue
@@ -13,8 +18,8 @@ def parse_specs(data: str):
         start_str, end_str = range_part.split(",")
         sl, sc = map(int, start_str.split("."))
         el, ec = map(int, end_str.split("."))
-        diagnostics.append(((sl, sc), (el, ec)))
-    return diagnostics
+        parsed.append(((sl, sc), (el, ec)))
+    return parsed
 
 
 def is_cursor_in_any(cursor: Position, diagnostics: SpecList) -> bool:
@@ -31,9 +36,35 @@ def is_cursor_in_any(cursor: Position, diagnostics: SpecList) -> bool:
     return False
 
 
-if __name__ == "__main__":
+def test():
     test_data = "1 10.21,10.30|DiagnosticHint 33.43,33.47|DiagnosticHint 34.7,34.10|DiagnosticHint 57.8,57.17|DiagnosticHint 68.9,68.18|DiagnosticHint 69.14,69.23|DiagnosticHint 72.7,72.11|DiagnosticHint 73.70,73.79|DiagnosticHint 75.7,75.11|DiagnosticHint 77.47,77.56|DiagnosticHint 79.27,79.28|DiagnosticHint 81.61,81.70|DiagnosticHint 84.66,84.75|DiagnosticHint 96.4,96.13|DiagnosticHint 97.3,97.12|DiagnosticHint 101.8,101.20|DiagnosticHint 145.28,145.43|DiagnosticHint 153.13,153.21|DiagnosticHint 155.13,155.21|DiagnosticHint 158.5,158.14|DiagnosticHint 164.56,164.61|DiagnosticHint 203.21,203.21|DiagnosticHint 204.28,204.28|DiagnosticHint 206.16,206.16|DiagnosticHint 209.5,209.5|DiagnosticHint 210.5,210.5|DiagnosticHint 216.25,216.25|DiagnosticHint 219.21,219.21|DiagnosticHint 225.27,225.27|DiagnosticHint 234.59,234.59|DiagnosticHint 263.37,263.39|DiagnosticHint 268.55,268.57|DiagnosticHint 287.46,287.47|DiagnosticHint 326.16,326.25|DiagnosticHint 337.34,337.36|DiagnosticHint 339.33,339.35|DiagnosticHint 364.63,364.71|DiagnosticHint 366.46,366.54|DiagnosticHint"
     out = parse_specs(test_data)
     print(out)
     test_cursor = (10, 24)
     print(is_cursor_in_any(test_cursor, out))
+
+
+def main():
+    in_path = "/tmp/diag-in"
+    out_path = "/tmp/diag-out"
+
+    with open(in_path, "r") as infile, open(out_path, "w") as outfile:
+        diagnostics = []
+        while True:
+            line = infile.readline()
+            if not line:
+                continue
+            assert isinstance(line, str)
+            if line.startswith("set "):
+                _, payload = line.split(" ", 1)
+                diagnostics = parse_specs(payload)
+                _ = outfile.write("ok\n")
+                outfile.flush()
+            elif line.startswith("query "):
+                _, pos = line.split(" ", 1)
+                l, c = map(int, pos.strip().split())
+                result = is_cursor_in_any((l, c), diagnostics)
+                _ = outfile.write("true\n" if result else "false\n")
+                outfile.flush()
+            elif line == "exit":
+                break