fix(lsp): detect Windows wrapper binaries in installer probes

agent/lsp/cli.py

@@ -247,18 +247,13 @@ def _cmd_restart() -> int:
 
 
 def _cmd_which(server_id: str) -> int:
-    from agent.lsp.install import INSTALL_RECIPES, hermes_lsp_bin_dir
-    import shutil as _shutil
+    from agent.lsp.install import INSTALL_RECIPES, _existing_binary
 
     recipe = INSTALL_RECIPES.get(server_id)
     bin_name = (recipe or {}).get("bin", server_id)
-    staged = hermes_lsp_bin_dir() / bin_name
-    if staged.exists():
-        sys.stdout.write(str(staged) + "\n")
-        return 0
-    on_path = _shutil.which(bin_name)
-    if on_path:
-        sys.stdout.write(on_path + "\n")
+    resolved = _existing_binary(bin_name)
+    if resolved:
+        sys.stdout.write(resolved + "\n")
         return 0
     sys.stderr.write(f"{server_id}: not installed\n")
     return 1
@@ -292,11 +287,9 @@ def _backend_warnings() -> list:
     suggestion across common platforms.
     """
     import shutil as _shutil
-    from agent.lsp.install import hermes_lsp_bin_dir
+    from agent.lsp.install import _existing_binary
     notes: list = []
-    bash_installed = _shutil.which("bash-language-server") is not None or (
-        (hermes_lsp_bin_dir() / "bash-language-server").exists()
-    )
+    bash_installed = _existing_binary("bash-language-server") is not None
     if bash_installed and _shutil.which("shellcheck") is None:
         notes.append(
             "bash-language-server is installed but shellcheck is missing — "

agent/lsp/install.py

@@ -108,6 +108,11 @@ INSTALL_RECIPES: Dict[str, Dict[str, Any]] = {
 _install_locks: Dict[str, threading.Lock] = {}
 _install_results: Dict[str, Optional[str]] = {}
 _install_lock_meta = threading.Lock()
+_WINDOWS_WRAPPER_SUFFIXES = (".cmd", ".exe", ".bat")
+
+
+def _is_windows() -> bool:
+    return os.name == "nt"
 
 
 def hermes_lsp_bin_dir() -> Path:
@@ -120,14 +125,33 @@ def hermes_lsp_bin_dir() -> Path:
     return p
 
 
+def _native_binary_candidates(base: Path) -> list[Path]:
+    """Return platform-native executable candidates for a staged binary."""
+    candidates = [base]
+    if _is_windows():
+        existing = {str(base).lower()}
+        for suffix in _WINDOWS_WRAPPER_SUFFIXES:
+            candidate = Path(str(base) + suffix)
+            key = str(candidate).lower()
+            if key not in existing:
+                candidates.append(candidate)
+                existing.add(key)
+    return candidates
+
+
 def _existing_binary(name: str) -> Optional[str]:
     """Probe the staging dir + PATH for a binary named ``name``."""
-    staged = hermes_lsp_bin_dir() / name
-    if staged.exists() and os.access(staged, os.X_OK):
-        return str(staged)
+    for staged in _native_binary_candidates(hermes_lsp_bin_dir() / name):
+        if staged.exists() and os.access(staged, os.X_OK):
+            return str(staged)
     on_path = shutil.which(name)
     if on_path:
         return on_path
+    if _is_windows():
+        for suffix in _WINDOWS_WRAPPER_SUFFIXES:
+            on_path = shutil.which(f"{name}{suffix}")
+            if on_path:
+                return on_path
     return None
 
 
@@ -250,12 +274,7 @@ def _install_npm(
 
     # Find the bin
     nm_bin = staging / "node_modules" / ".bin" / bin_name
-    if os.name == "nt":
-        # On Windows npm sometimes drops `.cmd` shims
-        candidates = [nm_bin, nm_bin.with_suffix(".cmd")]
-    else:
-        candidates = [nm_bin]
-    for c in candidates:
+    for c in _native_binary_candidates(nm_bin):
         if c.exists():
             # Symlink into our `lsp/bin/` for stable PATH access.
             link = hermes_lsp_bin_dir() / c.name
@@ -301,7 +320,7 @@ def _install_go(pkg: str, bin_name: str) -> Optional[str]:
         logger.warning("[install] go install errored for %s: %s", pkg, e)
         return None
     bin_path = staging / bin_name
-    if os.name == "nt":
+    if _is_windows():
         bin_path = bin_path.with_suffix(".exe")
     if bin_path.exists():
         return str(bin_path)
@@ -337,19 +356,24 @@ def _install_pip(pkg: str, bin_name: str) -> Optional[str]:
     except (subprocess.TimeoutExpired, OSError) as e:
         logger.warning("[install] pip install errored for %s: %s", pkg, e)
         return None
-    # Look for the script
-    bin_path = pip_target / "bin" / bin_name
-    if bin_path.exists():
-        link = hermes_lsp_bin_dir() / bin_name
-        if not link.exists():
-            try:
-                link.symlink_to(bin_path)
-            except (OSError, NotImplementedError):
-                try:
-                    shutil.copy2(bin_path, link)
-                except OSError:
-                    return str(bin_path)
-        return str(link if link.exists() else bin_path)
+    # Look for the console script.  POSIX wheels generally write to bin/,
+    # while native Windows installs use Scripts/.
+    script_dirs = [pip_target / "bin"]
+    if _is_windows():
+        script_dirs.append(pip_target / "Scripts")
+    for script_dir in script_dirs:
+        for bin_path in _native_binary_candidates(script_dir / bin_name):
+            if bin_path.exists():
+                link = hermes_lsp_bin_dir() / bin_path.name
+                if not link.exists():
+                    try:
+                        link.symlink_to(bin_path)
+                    except (OSError, NotImplementedError):
+                        try:
+                            shutil.copy2(bin_path, link)
+                        except OSError:
+                            return str(bin_path)
+                return str(link if link.exists() else bin_path)
     return None