Fix Windows UIA postcondition retries and plugin launch

crates/comptrol-core/src/mcp/mod.rs

@@ -1,6 +1,12 @@
 #![deny(unsafe_code)]
 
 pub const LEGACY_VERSION: &str = "2025-03-26";
+pub const HANDSHAKE_VERSIONS: &[&str] = &[
+    "2025-11-25",
+    "2025-06-18",
+    LEGACY_VERSION,
+    "2024-11-05",
+];
 pub const CURRENT_VERSION: &str = "2026-07-28";
 
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
@@ -11,17 +17,23 @@ pub enum ProtocolMode {
 
 pub fn negotiate(requested: Option<&str>) -> Result<(&'static str, ProtocolMode), String> {
     match requested {
-        None | Some(LEGACY_VERSION) => Ok((LEGACY_VERSION, ProtocolMode::Legacy)),
         Some(CURRENT_VERSION) => Ok((CURRENT_VERSION, ProtocolMode::Current)),
-        Some(other) => Err(format!("unsupported MCP protocol version {other}")),
+        Some(version) => HANDSHAKE_VERSIONS
+            .iter()
+            .copied()
+            .find(|supported| *supported == version)
+            .map(|supported| (supported, ProtocolMode::Legacy))
+            .ok_or_else(|| format!("unsupported MCP protocol version {version}")),
+        None => Ok((LEGACY_VERSION, ProtocolMode::Legacy)),
     }
 }
 
 pub fn from_header(value: Option<&str>) -> Result<ProtocolMode, String> {
     match value {
-        None | Some(LEGACY_VERSION) => Ok(ProtocolMode::Legacy),
         Some(CURRENT_VERSION) => Ok(ProtocolMode::Current),
+        Some(version) if HANDSHAKE_VERSIONS.contains(&version) => Ok(ProtocolMode::Legacy),
         Some(other) => Err(format!("unsupported MCP protocol version {other}")),
+        None => Ok(ProtocolMode::Legacy),
     }
 }
 
@@ -32,10 +44,16 @@ mod tests {
     #[test]
     fn supports_legacy_and_current_modes_without_accepting_unknown_versions() {
         assert_eq!(negotiate(None).unwrap().1, ProtocolMode::Legacy);
+        for version in HANDSHAKE_VERSIONS {
+            assert_eq!(negotiate(Some(version)).unwrap(), (*version, ProtocolMode::Legacy));
+            assert_eq!(from_header(Some(version)).unwrap(), ProtocolMode::Legacy);
+        }
         assert_eq!(
             negotiate(Some(CURRENT_VERSION)).unwrap().1,
             ProtocolMode::Current
         );
+        assert_eq!(from_header(Some(CURRENT_VERSION)).unwrap(), ProtocolMode::Current);
         assert!(negotiate(Some("future")).is_err());
+        assert!(from_header(Some("future")).is_err());
     }
 }

crates/comptrol-platform-windows/src/lib.rs

@@ -7,7 +7,7 @@
 mod uia;
 
 #[cfg(windows)]
-pub use uia::{Action, Request, SemanticCacheEntry, UiaScopedCache, execute};
+pub use uia::{Action, Request, execute};
 
 #[cfg(not(windows))]
 pub mod unsupported {