mcp: search_file_content: fix "path is empty" error

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

Author: AkihiroSuda

pkg/mcp/toolset/filesystem.go

@@ -158,7 +158,8 @@ func (ts *ToolSet) SearchFileContent(ctx context.Context,
 		guestPath = path.Join(guestPath, *args.Include)
 	}
 	cmdToolRes, cmdRes, err := ts.RunShellCommand(ctx, req, msi.RunShellCommandParams{
-		Command: []string{"git", "grep", "-n", "--no-index", args.Pattern, guestPath},
+		Command:   []string{"git", "grep", "-n", "--no-index", args.Pattern, guestPath},
+		Directory: pathStr, // Directory must be always set
 	})
 	if err != nil {
 		return cmdToolRes, nil, err