diff --git a/CHANGELOG.md b/CHANGELOG.md
index d91ccde..1fe4c3d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
-## Version 0.6.2
+## Version 0.7.0
+- Added passive support for array jobs. In the output of `qq jobs` and `qq stat`, individual sub-jobs are displayed for all array jobs.
+- Added autocomplete for script name in `qq submit` and `qq shebang`.
+- Some rewordings.
+
+***
 
+## Version 0.6.2
 - The operation for obtaining the list of working nodes at job start is now retried potentially decreasing the number of failures on unstable systems (like Metacentrum).
 
 ## Version 0.6.1
diff --git a/pyproject.toml b/pyproject.toml
index 001e7c0..f8c5011 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -51,7 +51,7 @@ dev = [
     "pytest-cov>=7.0.0",
     "ruff>=0.13.0",
     "snakeviz>=2.2.2",
-    "ty>=0.0.1a24",
+    "ty>=0.0.18",
 ]
 
 
diff --git a/src/qq_lib/batch/interface/job.py b/src/qq_lib/batch/interface/job.py
index d630617..a377842 100644
--- a/src/qq_lib/batch/interface/job.py
+++ b/src/qq_lib/batch/interface/job.py
@@ -3,6 +3,7 @@
 
 
 from abc import ABC, abstractmethod
+from collections.abc import Sequence
 from datetime import datetime, timedelta
 from pathlib import Path
 from typing import Self
@@ -331,7 +332,7 @@ def toYaml(self) -> str:
         pass
 
     @abstractmethod
-    def getSteps(self) -> list[Self]:
+    def getSteps(self) -> Sequence[Self]:
         """
         Return a list of steps associated with this job.
 
@@ -339,7 +340,7 @@ def getSteps(self) -> list[Self]:
         may not contain all the values that a proper BatchJobInterface contains.
 
         Returns:
-            list[BatchJobInterface] | None: List of job steps. An empty list if there are none.
+            Sequence[BatchJobInterface]: List of job steps. An empty list if there are none.
         """
         pass
 
@@ -352,3 +353,13 @@ def getStepId(self) -> str | None:
             str | None: Job step index or `None` if this is not a job step.
         """
         pass
+
+    @abstractmethod
+    def isArrayJob(self) -> bool:
+        """
+        Return `True` if the job is a top-level array job (not a sub-job).
+
+        Returns:
+            bool: `True` if the job is a top-level array job, else `False`.
+        """
+        pass
diff --git a/src/qq_lib/batch/interface/meta.py b/src/qq_lib/batch/interface/meta.py
index 320fa05..36be368 100644
--- a/src/qq_lib/batch/interface/meta.py
+++ b/src/qq_lib/batch/interface/meta.py
@@ -29,7 +29,7 @@ def __str__(cls: type[BatchInterface]) -> str:
         return cls.envName()
 
     @classmethod
-    def register(cls, batch_cls: type[BatchInterface]) -> None:
+    def registerBatchSystem(cls, batch_cls: type[BatchInterface]) -> None:
         """
         Register a batch system class in the metaclass registry.
 
@@ -132,5 +132,5 @@ def batch_system(cls):
 
     Has to be added to every implementation of `BatchInterface`.
     """
-    BatchMeta.register(cls)
+    BatchMeta.registerBatchSystem(cls)
     return cls
diff --git a/src/qq_lib/batch/pbs/common.py b/src/qq_lib/batch/pbs/common.py
index 31cae95..2fe410c 100644
--- a/src/qq_lib/batch/pbs/common.py
+++ b/src/qq_lib/batch/pbs/common.py
@@ -39,7 +39,8 @@ def parse_multi_pbs_dump_to_dictionaries(
 
     Args:
         text (str): The raw PBS dump containing information about one or more queues/jobs/nodes.
-        keyword (str): Keyword identifying the start of a metadata block.
+        keyword (str | None): Keyword identifying the start of a metadata block.
+            If `None`, the first line is treated as identifier.
 
     Returns:
         list[tuple[dict[str, str], str]]: A list of tuples, each containing:
@@ -68,14 +69,14 @@ def parse_multi_pbs_dump_to_dictionaries(
 
         if not block:
             # extract the identifier
-            if keyword:
-                m = pattern.match(line)  # ty: ignore[possibly-missing-attribute]
+            if pattern:
+                m = pattern.match(line)
                 if not m:
                     raise QQError(
                         f"Invalid PBS dump format. Could not extract identifier from:\n{line}"
                     )
                 identifier = m.group(1).strip()
-            # if keyword is not specified, used the first line as the identifier
+            # if keyword is not specified, use the first line as the identifier
             else:
                 identifier = line.strip()
         block.append(line)
diff --git a/src/qq_lib/batch/pbs/job.py b/src/qq_lib/batch/pbs/job.py
index efdbcc2..6486e8e 100644
--- a/src/qq_lib/batch/pbs/job.py
+++ b/src/qq_lib/batch/pbs/job.py
@@ -3,6 +3,7 @@
 
 import re
 import subprocess
+from collections.abc import Sequence
 from datetime import datetime, timedelta
 from pathlib import Path
 from typing import Self
@@ -10,7 +11,9 @@
 import yaml
 
 from qq_lib.batch.interface import BatchJobInterface
-from qq_lib.batch.pbs.common import parse_pbs_dump_to_dictionary
+from qq_lib.batch.pbs.common import (
+    parse_pbs_dump_to_dictionary,
+)
 from qq_lib.core.common import hhmmss_to_duration, load_yaml_dumper
 from qq_lib.core.config import CFG
 from qq_lib.core.error import QQError
@@ -71,6 +74,11 @@ def getState(self) -> BatchState:
         if not (state := self._info.get("job_state")):
             return BatchState.UNKNOWN
 
+        # X is used by PBS to indicate finished tasks in unfinished array jobs,
+        # but qq uses X to indicate failure
+        if state == "X":
+            state = "F"
+
         # if the job is finished and the return code is not zero, return FAILED
         if state == "F":
             exit_code = self.getExitCode()
@@ -289,7 +297,7 @@ def toYaml(self) -> str:
             to_dump, default_flow_style=False, sort_keys=False, Dumper=Dumper
         )
 
-    def getSteps(self) -> list[Self]:
+    def getSteps(self) -> Sequence[Self]:
         # not available for PBS
         return []
 
@@ -297,6 +305,11 @@ def getStepId(self) -> str | None:
         # no job steps for PBS
         return None
 
+    def isArrayJob(self) -> bool:
+        return (
+            array := self._info.get("array")
+        ) is not None and array.lower() == "true"
+
     @classmethod
     def fromDict(cls, job_id: str, info: dict[str, str]) -> Self:
         """
diff --git a/src/qq_lib/batch/pbs/pbs.py b/src/qq_lib/batch/pbs/pbs.py
index cb212ec..1fe320d 100644
--- a/src/qq_lib/batch/pbs/pbs.py
+++ b/src/qq_lib/batch/pbs/pbs.py
@@ -150,29 +150,29 @@ def jobKillForce(cls, job_id: str) -> None:
 
     @classmethod
     def getBatchJob(cls, job_id: str) -> PBSJob:
-        return PBSJob(job_id)  # ty: ignore[invalid-return-type]
+        return PBSJob(job_id)
 
     @classmethod
     def getUnfinishedBatchJobs(cls, user: str) -> list[PBSJob]:
-        command = f"qstat -fwu {user}"
+        command = f"qstat -fwtu {user}"
         logger.debug(command)
         return cls._getBatchJobsUsingCommand(command)
 
     @classmethod
     def getBatchJobs(cls, user: str) -> list[PBSJob]:
-        command = f"qstat -fwxu {user}"
+        command = f"qstat -fwxtu {user}"
         logger.debug(command)
         return cls._getBatchJobsUsingCommand(command)
 
     @classmethod
     def getAllUnfinishedBatchJobs(cls) -> list[PBSJob]:
-        command = "qstat -fw"
+        command = "qstat -fwt"
         logger.debug(command)
         return cls._getBatchJobsUsingCommand(command)
 
     @classmethod
     def getAllBatchJobs(cls) -> list[PBSJob]:
-        command = "qstat -fxw"
+        command = "qstat -fxwt"
         logger.debug(command)
         return cls._getBatchJobsUsingCommand(command)
 
@@ -857,6 +857,11 @@ def _getBatchJobsUsingCommand(cls, command: str) -> list[PBSJob]:
         for data, job_id in parse_multi_pbs_dump_to_dictionaries(
             result.stdout.strip(), "Job Id"
         ):
-            jobs.append(PBSJob.fromDict(job_id, data))
+            # ignore top-level array jobs
+            job = PBSJob.fromDict(job_id, data)
+            if job.isArrayJob():
+                continue
+
+            jobs.append(job)
 
         return jobs
diff --git a/src/qq_lib/batch/pbs/queue.py b/src/qq_lib/batch/pbs/queue.py
index 4fd86a6..8aad870 100644
--- a/src/qq_lib/batch/pbs/queue.py
+++ b/src/qq_lib/batch/pbs/queue.py
@@ -271,13 +271,11 @@ def _setJobNumbers(self) -> None:
         If parsing fails or the field is missing, `_job_numbers` is set to an empty dictionary.
         """
         if not (state_count := self._info.get("state_count")):
-            self._job_numbers = {}
+            self._job_numbers: dict[str, str] = {}
+            return
 
         try:
-            self._job_numbers = {
-                k: int(v)
-                for k, v in (p.split(":") for p in state_count.split())  # ty: ignore[possibly-missing-attribute]
-            }
+            self._job_numbers = dict(p.split(":") for p in state_count.split())
         except Exception as e:
             logger.warning(f"Could not get job counts for queue '{self._name}': {e}.")
-            self._job_numbers = {}
+            self._job_numbers: dict[str, str] = {}
diff --git a/src/qq_lib/batch/slurm/job.py b/src/qq_lib/batch/slurm/job.py
index f340690..b59f768 100644
--- a/src/qq_lib/batch/slurm/job.py
+++ b/src/qq_lib/batch/slurm/job.py
@@ -3,6 +3,7 @@
 
 import re
 import subprocess
+from collections.abc import Sequence
 from datetime import datetime, timedelta
 from pathlib import Path
 from typing import Self
@@ -307,7 +308,7 @@ def toYaml(self) -> str:
             self._info, default_flow_style=False, sort_keys=False, Dumper=Dumper
         )
 
-    def getSteps(self) -> list[Self]:
+    def getSteps(self) -> Sequence[Self]:
         command = f"sacct -j {self._job_id} --parsable2 --format={SACCT_STEP_FIELDS}"
         logger.debug(command)
 
@@ -343,6 +344,9 @@ def getStepId(self) -> str | None:
         except ValueError:
             return None
 
+    def isArrayJob(self) -> bool:
+        return False
+
     @classmethod
     def fromDict(cls, job_id: str, info: dict[str, str]) -> Self:
         """
@@ -416,7 +420,7 @@ def fromSacctString(cls, string: str) -> Self:
         SlurmJob._assignIfAllocated(info, "AllocCPUs", "ReqCPUs", "NumCPUs")
         SlurmJob._assignIfAllocated(info, "AllocNodes", "ReqNodes", "NumNodes")
 
-        return SlurmJob.fromDict(info["JobId"], info)
+        return cls.fromDict(info["JobId"], info)
 
     @classmethod
     def _stepFromSacctString(cls, string: str) -> Self:
@@ -448,7 +452,7 @@ def _stepFromSacctString(cls, string: str) -> Self:
         # other words may contain useless additional information
         info["JobState"] = info["JobState"].split()[0]
 
-        return SlurmJob.fromDict(info["JobId"], info)
+        return cls.fromDict(info["JobId"], info)
 
     def getIdsForSorting(self) -> list[int]:
         """
diff --git a/src/qq_lib/batch/slurm/slurm.py b/src/qq_lib/batch/slurm/slurm.py
index a4e5ee7..f7aeaf6 100644
--- a/src/qq_lib/batch/slurm/slurm.py
+++ b/src/qq_lib/batch/slurm/slurm.py
@@ -124,18 +124,18 @@ def jobKillForce(cls, job_id: str) -> None:
 
     @classmethod
     def getBatchJob(cls, job_id: str) -> SlurmJob:
-        return SlurmJob(job_id)  # ty: ignore[invalid-return-type]
+        return SlurmJob(job_id)
 
     @classmethod
     def getUnfinishedBatchJobs(cls, user: str) -> list[SlurmJob]:
         # get running jobs from sacct (faster than using squeue and scontrol)
-        command = f"sacct -u {user} --state RUNNING --allocations --noheader --parsable2 --format={SACCT_FIELDS}"
+        command = f"sacct -u {user} --state RUNNING --allocations --noheader --parsable2 --array --format={SACCT_FIELDS}"
         logger.debug(command)
 
         sacct_jobs = cls._getBatchJobsUsingSacctCommand(command)
 
         # get pending jobs using squeue
-        command = f'squeue -u {user} -t PENDING -h -o "%i"'
+        command = f'squeue -u {user} --array -t PENDING -h -o "%i"'
         logger.debug(command)
 
         squeue_jobs = cls._getBatchJobsUsingSqueueCommand(command)
@@ -147,13 +147,13 @@ def getUnfinishedBatchJobs(cls, user: str) -> list[SlurmJob]:
     @classmethod
     def getBatchJobs(cls, user: str) -> list[SlurmJob]:
         # get all jobs, except pending which are not available from sacct
-        command = f"sacct -u {user} --allocations --noheader --parsable2 --format={SACCT_FIELDS}"
+        command = f"sacct -u {user} --allocations --noheader --parsable2 --array --format={SACCT_FIELDS}"
         logger.debug(command)
 
         sacct_jobs = cls._getBatchJobsUsingSacctCommand(command)
 
         # get pending jobs using squeue
-        command = f'squeue -u {user} -t PENDING -h -o "%i"'
+        command = f'squeue -u {user} --array -t PENDING -h -o "%i"'
         logger.debug(command)
 
         squeue_jobs = cls._getBatchJobsUsingSqueueCommand(command)
@@ -165,13 +165,13 @@ def getBatchJobs(cls, user: str) -> list[SlurmJob]:
     @classmethod
     def getAllUnfinishedBatchJobs(cls) -> list[SlurmJob]:
         # get running jobs using sacct (faster than using squeue and scontrol)
-        command = f"sacct --state RUNNING --allusers --allocations --noheader --parsable2 --format={SACCT_FIELDS}"
+        command = f"sacct --state RUNNING --allusers --allocations --noheader --parsable2 --array --format={SACCT_FIELDS}"
         logger.debug(command)
 
         sacct_jobs = cls._getBatchJobsUsingSacctCommand(command)
 
         # get pending jobs using squeue
-        command = 'squeue -t PENDING -h -o "%i"'
+        command = 'squeue --array -t PENDING -h -o "%i"'
         logger.debug(command)
 
         squeue_jobs = cls._getBatchJobsUsingSqueueCommand(command)
@@ -183,13 +183,13 @@ def getAllUnfinishedBatchJobs(cls) -> list[SlurmJob]:
     @classmethod
     def getAllBatchJobs(cls) -> list[SlurmJob]:
         # get all jobs, except pending which are not available from sacct
-        command = f"sacct --allusers --allocations --noheader --parsable2 --format={SACCT_FIELDS}"
+        command = f"sacct --allusers --allocations --noheader --parsable2 --array --format={SACCT_FIELDS}"
         logger.debug(command)
 
         sacct_jobs = cls._getBatchJobsUsingSacctCommand(command)
 
         # get pending jobs using squeue
-        command = 'squeue -t PENDING -h -o "%i"'
+        command = 'squeue --array -t PENDING -h -o "%i"'
         logger.debug(command)
 
         squeue_jobs = cls._getBatchJobsUsingSqueueCommand(command)
diff --git a/src/qq_lib/clear/clearer.py b/src/qq_lib/clear/clearer.py
index 1d01960..e86d15f 100644
--- a/src/qq_lib/clear/clearer.py
+++ b/src/qq_lib/clear/clearer.py
@@ -66,7 +66,7 @@ def clear(self, force: bool = False) -> None:
         )
         if excluded:
             logger.info(
-                f"{len(excluded)} qq files were not safe to clear. Rerun as '{CFG.binary_name} clear --force' to clear them forcibly."
+                f"{len(excluded)} qq files could not be safely cleared. Rerun as '{CFG.binary_name} clear --force' to clear them forcibly."
             )
 
     def _collectRunTimeFiles(self) -> set[Path]:
diff --git a/src/qq_lib/core/click_format.py b/src/qq_lib/core/click_format.py
index 5c5787a..7f5f5bb 100644
--- a/src/qq_lib/core/click_format.py
+++ b/src/qq_lib/core/click_format.py
@@ -32,7 +32,7 @@ def write_heading(self, heading: str) -> None:
 
             def write_usage(
                 self, prog_name: str, args: str | None, prefix: str | None = None
-            ) -> None:
+            ) -> None:  # ty: ignore[invalid-method-override]
                 """Override to make Usage: header bold"""
                 if prefix is None:
                     prefix = "Usage:"
@@ -50,7 +50,7 @@ def write_dl(
                 rows: Sequence[tuple[str, str | None]],
                 _col_max: int = 30,
                 _col_spacing: int = 2,
-            ) -> None:
+            ) -> None:  # ty: ignore[invalid-method-override]
                 for term, definition in rows:
                     colored_term = click.style(term, fg=self.options_color, bold=True)
                     self.write(f"  {colored_term}\n")
diff --git a/src/qq_lib/core/common.py b/src/qq_lib/core/common.py
index d81dfc2..15eed8d 100644
--- a/src/qq_lib/core/common.py
+++ b/src/qq_lib/core/common.py
@@ -30,7 +30,7 @@
 def load_yaml_dumper() -> type[yaml.Dumper]:
     """Return the fastest available YAML dumper (CDumper if possible)."""
     try:
-        from yaml import CDumper as Dumper  # type: ignore[attr-defined]
+        from yaml import CDumper as Dumper
 
         logger.debug("Loaded YAML CDumper.")
     except ImportError:
@@ -45,7 +45,7 @@ def load_yaml_loader() -> type[yaml.SafeLoader]:
     """Return the fastest available safe YAML loader (CSafeLoader if possible)."""
     try:
         from yaml import (
-            CSafeLoader as SafeLoader,  # ty: ignore[possibly-missing-import]
+            CSafeLoader as SafeLoader,
         )
 
         logger.debug("Loaded YAML CLoader.")
diff --git a/src/qq_lib/core/repeater.py b/src/qq_lib/core/repeater.py
index f0a29df..b2e67b4 100644
--- a/src/qq_lib/core/repeater.py
+++ b/src/qq_lib/core/repeater.py
@@ -65,7 +65,7 @@ def onException(
                 - BaseException: The caught exception instance.
                 - Repeater: Reference to this `Repeater` instance.
         """
-        self._handlers[exc_type] = handler  # ty: ignore[invalid-assignment]
+        self._handlers[exc_type] = handler
 
     def run(self) -> None:
         """
@@ -87,4 +87,4 @@ def run(self) -> None:
             except tuple(self._handlers.keys()) as e:
                 self.encountered_errors[i] = e
                 handler = self._handlers[type(e)]
-                handler(e, self)  # ty: ignore[invalid-argument-type]
+                handler(e, self)
diff --git a/src/qq_lib/go/goer.py b/src/qq_lib/go/goer.py
index 3ae7b10..375959c 100644
--- a/src/qq_lib/go/goer.py
+++ b/src/qq_lib/go/goer.py
@@ -83,6 +83,9 @@ def go(self) -> None:
                 "Host ('main_node') or working directory ('work_dir') are not defined."
             )
 
+        # hint for type checker
+        # work_dir and main_node must be set - we check that in self.hasDestination
+        assert self._work_dir and self._main_node
         logger.info(f"Navigating to '{str(self._work_dir)}' on '{self._main_node}'.")
         self._batch_system.navigateToDestination(self._main_node, self._work_dir)
 
diff --git a/src/qq_lib/info/informer.py b/src/qq_lib/info/informer.py
index 3237785..8e416fa 100644
--- a/src/qq_lib/info/informer.py
+++ b/src/qq_lib/info/informer.py
@@ -85,7 +85,7 @@ def fromJobId(cls, job_id: str) -> Self:
         if batch_job.isEmpty():
             raise QQError(f"Job '{job_id}' does not exist.")
 
-        return Informer.fromBatchJob(batch_job)
+        return cls.fromBatchJob(batch_job)
 
     @classmethod
     def fromBatchJob(cls, batch_job: BatchJobInterface) -> Self:
@@ -109,7 +109,7 @@ def fromBatchJob(cls, batch_job: BatchJobInterface) -> Self:
         if not (path := batch_job.getInfoFile()):
             raise QQError(f"Job '{batch_job.getId()}' is not a valid qq job.")
 
-        informer = Informer.fromFile(path)
+        informer = cls.fromFile(path)
 
         # check that the loaded info file actually corresponds to the batch job's ID
         if not informer.matchesJob(batch_job.getId()):
diff --git a/src/qq_lib/info/presenter.py b/src/qq_lib/info/presenter.py
index b7149a1..143b605 100644
--- a/src/qq_lib/info/presenter.py
+++ b/src/qq_lib/info/presenter.py
@@ -1,6 +1,7 @@
 # Released under MIT License.
 # Copyright (c) 2025-2026 Ladislav Bartos and Robert Vacha Lab
 
+from collections.abc import Sequence
 from datetime import datetime
 
 from rich.align import Align
@@ -362,7 +363,7 @@ def _createJobStatusTable(
 
         return table
 
-    def _createJobStepsTable(self, steps: list[BatchJobInterface]) -> Table:
+    def _createJobStepsTable(self, steps: Sequence[BatchJobInterface]) -> Table:
         """
         Create a formatted Rich table displaying job step information.
 
@@ -370,7 +371,7 @@ def _createJobStepsTable(self, steps: list[BatchJobInterface]) -> Table:
         to be used within full-info job panels.
 
         Args:
-            steps: A list of batch-system step objects belonging to the job.
+            steps (Sequence[BatchJobInterface]): A list of batch-system step objects belonging to the job.
 
         Returns:
             Table: A Rich table containing the formatted step information.
diff --git a/src/qq_lib/jobs/presenter.py b/src/qq_lib/jobs/presenter.py
index 0f76b3b..819704b 100644
--- a/src/qq_lib/jobs/presenter.py
+++ b/src/qq_lib/jobs/presenter.py
@@ -214,7 +214,7 @@ def _createJobRow(self, job: BatchJobInterface, headers: list[str]) -> list[str]
         self._stats.addJob(state, cpus, gpus, nodes)
 
         # build the row
-        row_data = {
+        row_data: dict[str, str] = {
             "S": JobsPresenter._color(state.toCode(), state.color),
             "Job ID": JobsPresenter._mainColor(
                 JobsPresenter._shortenJobId(job.getId())
@@ -233,7 +233,7 @@ def _createJobRow(self, job: BatchJobInterface, headers: list[str]) -> list[str]
             "Node": JobsPresenter._formatNodesOrComment(state, job),
             "%CPU": JobsPresenter._formatUtilCPU(job.getUtilCPU()),
             "%Mem": JobsPresenter._formatUtilMem(job.getUtilMem()),
-            "Exit": JobsPresenter._formatExitCode(job, state) if self._all else None,
+            "Exit": JobsPresenter._formatExitCode(job, state) if self._all else "",
         }
 
         return [row_data[header] for header in headers if header in row_data]
diff --git a/src/qq_lib/properties/depend.py b/src/qq_lib/properties/depend.py
index 374d6d0..a9bf3e9 100644
--- a/src/qq_lib/properties/depend.py
+++ b/src/qq_lib/properties/depend.py
@@ -38,7 +38,7 @@ class DependType(Enum):
     AFTER_COMPLETION = 3
 
     @classmethod
-    def fromStr(cls, string: str) -> Self:
+    def fromStr(cls, string: str) -> "DependType":
         """
         Convert a dependency string keyword to a `DependType`.
 
diff --git a/src/qq_lib/properties/info.py b/src/qq_lib/properties/info.py
index bca0771..c0b421c 100644
--- a/src/qq_lib/properties/info.py
+++ b/src/qq_lib/properties/info.py
@@ -333,8 +333,8 @@ def _fromDict(cls, data: dict[str, object]) -> Self:
             # convert optional loop job info
             elif f.type == LoopInfo | None and isinstance(value, dict):
                 # 'archive' must be converted to Path
-                init_kwargs[name] = LoopInfo(  # ty: ignore[missing-argument]
-                    **{k: Path(v) if k == "archive" else v for k, v in value.items()}
+                init_kwargs[name] = LoopInfo(
+                    **{k: Path(v) if k == "archive" else v for k, v in value.items()}  # ty: ignore[invalid-argument-type]
                 )
             # convert resources
             elif f.type == Resources:
@@ -349,7 +349,7 @@ def _fromDict(cls, data: dict[str, object]) -> Self:
                 )
             # convert paths (incl. optional paths)
             elif f.type == Path or f.type == Path | None:
-                init_kwargs[name] = Path(value)
+                init_kwargs[name] = Path(value)  # ty: ignore[invalid-argument-type]
             # convert the list of excluded paths
             elif f.type == list[Path] and isinstance(value, list):
                 init_kwargs[name] = [
diff --git a/src/qq_lib/properties/states.py b/src/qq_lib/properties/states.py
index e5a072f..3b96c50 100644
--- a/src/qq_lib/properties/states.py
+++ b/src/qq_lib/properties/states.py
@@ -14,7 +14,6 @@
 """
 
 from enum import Enum
-from typing import Self
 
 from qq_lib.core.config import CFG
 from qq_lib.core.logger import get_logger
@@ -44,7 +43,7 @@ def __str__(self) -> str:
         return self.name.lower()
 
     @classmethod
-    def fromStr(cls, s: str) -> Self:
+    def fromStr(cls, s: str) -> "NaiveState":
         """
         Convert a string to the corresponding NaiveState enum variant.
 
@@ -106,7 +105,7 @@ def _codeToState(cls) -> dict[str, str]:
         }
 
     @classmethod
-    def fromCode(cls, code: str) -> Self:
+    def fromCode(cls, code: str) -> "BatchState":
         """
         Convert a one-letter batch system code to a BatchState enum variant.
 
@@ -186,7 +185,9 @@ def __str__(self) -> str:
         return self.name.lower().replace("_", " ")
 
     @classmethod
-    def fromStates(cls, naive_state: NaiveState, batch_state: BatchState) -> Self:
+    def fromStates(
+        cls, naive_state: NaiveState, batch_state: BatchState
+    ) -> "RealState":
         """
         Determine the RealState of a job based on its NaiveState and BatchState.
 
diff --git a/src/qq_lib/qq.py b/src/qq_lib/qq.py
index 6e35228..59cb850 100644
--- a/src/qq_lib/qq.py
+++ b/src/qq_lib/qq.py
@@ -47,6 +47,8 @@ def cli(ctx: click.Context, version: bool):
     qq is a wrapper around batch scheduling systems, simplifying job submission and management.
 
     For detailed information, visit: https://vachalab.github.io/qq-manual.
+
+    To report issues and suggest improvements, visit: https://github.com/VachaLab/qq/issues.
     """
     if version:
         print(__version__)
diff --git a/src/qq_lib/shebang/cli.py b/src/qq_lib/shebang/cli.py
index 8723298..861d8ca 100644
--- a/src/qq_lib/shebang/cli.py
+++ b/src/qq_lib/shebang/cli.py
@@ -30,7 +30,9 @@
 )
 @click.argument(
     "script",
-    type=str,
+    type=click.Path(
+        exists=True, file_okay=True, dir_okay=False, readable=True, path_type=str
+    ),
     metavar=click.style("SCRIPT", fg="green"),
     required=False,
     default=None,
diff --git a/src/qq_lib/submit/cli.py b/src/qq_lib/submit/cli.py
index 37753c3..30ed37d 100644
--- a/src/qq_lib/submit/cli.py
+++ b/src/qq_lib/submit/cli.py
@@ -33,7 +33,13 @@
     cls=GNUHelpColorsCommand,
     help_options_color="bright_blue",
 )
-@click.argument("script", type=str, metavar=click.style("SCRIPT", fg="green"))
+@click.argument(
+    "script",
+    type=click.Path(
+        exists=True, file_okay=True, dir_okay=False, readable=True, path_type=str
+    ),
+    metavar=click.style("SCRIPT", fg="green"),
+)
 @optgroup.group(f"{click.style('General settings', fg='yellow')}")
 @optgroup.option(
     "--queue",
diff --git a/src/qq_lib/submit/parser.py b/src/qq_lib/submit/parser.py
index 3c225b6..4a76795 100644
--- a/src/qq_lib/submit/parser.py
+++ b/src/qq_lib/submit/parser.py
@@ -34,7 +34,11 @@ def __init__(self, script: Path, params: list[Parameter]):
                 valid options. Only `GroupedOption` names are considered.
         """
         self._script = script
-        self._known_options = {p.name for p in params if isinstance(p, GroupedOption)}
+        self._known_options = {
+            p.name
+            for p in params
+            if isinstance(p, GroupedOption) and p.name is not None
+        }
         logger.debug(
             f"Known options for Parser: {self._known_options} ({len(self._known_options)} options)."
         )
@@ -149,7 +153,7 @@ def getResources(self) -> Resources:
         """
         field_names = {f.name for f in fields(Resources)}
         # only select fields that are part of Resources
-        return Resources(**{k: v for k, v in self._options.items() if k in field_names})
+        return Resources(**{k: v for k, v in self._options.items() if k in field_names})  # ty: ignore[invalid-argument-type]
 
     def getExclude(self) -> list[Path]:
         """
@@ -204,8 +208,8 @@ def getArchive(self) -> Path | None:
         Returns:
             Path | None: Archive directory path, or None if not set.
         """
-        if archive := self._options.get("archive"):
-            return Path(archive)
+        if (archive := self._options.get("archive")) is not None:
+            return Path(archive)  # ty: ignore[invalid-argument-type]
 
         return None
 
diff --git a/src/qq_lib/sync/syncer.py b/src/qq_lib/sync/syncer.py
index 9db2143..b07dc80 100644
--- a/src/qq_lib/sync/syncer.py
+++ b/src/qq_lib/sync/syncer.py
@@ -62,6 +62,10 @@ def sync(self, files: list[str] | None = None) -> None:
                 "Host ('main_node') or working directory ('work_dir') are not defined."
             )
 
+        # hint for type checker
+        # work_dir and main_node must be set - we check that in self.hasDestination
+        assert self._work_dir and self._main_node
+
         if files:
             logger.info(
                 f"Fetching file{'s' if len(files) > 1 else ''} '{' '.join(files)}' from job's working directory to input directory."
@@ -71,7 +75,7 @@ def sync(self, files: list[str] | None = None) -> None:
                 self._informer.info.input_dir,
                 self._main_node,
                 None,
-                [self._work_dir / x for x in files],  # ty: ignore[unsupported-operator]
+                [self._work_dir / x for x in files],
             )
         else:
             logger.info(
diff --git a/src/qq_lib/wipe/wiper.py b/src/qq_lib/wipe/wiper.py
index 0f26e53..756c72b 100644
--- a/src/qq_lib/wipe/wiper.py
+++ b/src/qq_lib/wipe/wiper.py
@@ -65,6 +65,10 @@ def wipe(self) -> str:
                 "Host ('main_node') or working directory ('work_dir') are not defined."
             )
 
+        # hint for type checker
+        # work_dir and main_node must be set - we check that in self.hasDestination
+        assert self._work_dir and self._main_node
+
         # we cannot delete the input directory even if the `--force` flag is used
         if self._workDirIsInputDir():
             raise QQError(
diff --git a/tests/test_batch_interface.py b/tests/test_batch_interface.py
index 649efeb..50049ba 100644
--- a/tests/test_batch_interface.py
+++ b/tests/test_batch_interface.py
@@ -56,7 +56,7 @@ def test_navigate_same_host_error():
 
 def test_guess_pbs():
     BatchMeta._registry.clear()
-    BatchMeta.register(PBS)
+    BatchMeta.registerBatchSystem(PBS)
 
     with patch.object(PBS, "isAvailable", return_value=True):
         assert BatchMeta.guess() is PBS
@@ -76,7 +76,7 @@ def test_guess_empty_registry():
 
 def test_from_str_success():
     BatchMeta._registry.clear()
-    BatchMeta.register(PBS)
+    BatchMeta.registerBatchSystem(PBS)
 
     assert BatchMeta.fromStr("PBS") is PBS
 
@@ -97,7 +97,7 @@ def test_from_str_none_registered():
 
 def test_env_var_or_guess_from_env_var_returns_value(monkeypatch):
     BatchMeta._registry.clear()
-    BatchMeta.register(PBS)
+    BatchMeta.registerBatchSystem(PBS)
     monkeypatch.setenv(CFG.env_vars.batch_system, "PBS")
 
     assert BatchMeta.fromEnvVarOrGuess() is PBS
@@ -105,7 +105,7 @@ def test_env_var_or_guess_from_env_var_returns_value(monkeypatch):
 
 def test_env_var_or_guess_from_env_var_not_set_calls_guess():
     BatchMeta._registry.clear()
-    BatchMeta.register(PBS)
+    BatchMeta.registerBatchSystem(PBS)
     if CFG.env_vars.batch_system in os.environ:
         del os.environ[CFG.env_vars.batch_system]
 
@@ -126,7 +126,7 @@ def test_from_env_var_not_set_calls_guess():
 
 def test_obtain_with_name_registered():
     BatchMeta._registry.clear()
-    BatchMeta.register(PBS)
+    BatchMeta.registerBatchSystem(PBS)
 
     assert BatchMeta.obtain("PBS") is PBS
 
@@ -140,7 +140,7 @@ def test_obtain_with_name_not_registered():
 
 def test_obtain_without_name_env_var(monkeypatch):
     BatchMeta._registry.clear()
-    BatchMeta.register(PBS)
+    BatchMeta.registerBatchSystem(PBS)
     monkeypatch.setenv(CFG.env_vars.batch_system, "PBS")
 
     assert BatchMeta.obtain(None) is PBS
diff --git a/tests/test_batch_pbs_pbs.py b/tests/test_batch_pbs_pbs.py
index 8ab191d..366b321 100644
--- a/tests/test_batch_pbs_pbs.py
+++ b/tests/test_batch_pbs_pbs.py
@@ -1167,14 +1167,14 @@ def test_get_jobs_info_using_command_success(sample_multi_dump_file):
             "123457.fake-cluster.example.com",
             "123458.fake-cluster.example.com",
         ]
-        assert [job._job_id for job in jobs] == expected_ids  # ty: ignore[unresolved-attribute]
+        assert [job._job_id for job in jobs] == expected_ids
 
-        assert [job._info["Job_Name"] for job in jobs] == [  # ty: ignore[unresolved-attribute]
+        assert [job._info["Job_Name"] for job in jobs] == [
             "example_job_1",
             "example_job_2",
             "example_job_3",
         ]
-        assert [job._info["job_state"] for job in jobs] == [  # ty: ignore[unresolved-attribute]
+        assert [job._info["job_state"] for job in jobs] == [
             "R",
             "Q",
             "H",
diff --git a/tests/test_batch_pbs_queue.py b/tests/test_batch_pbs_queue.py
index 5cbfef2..0845d7e 100644
--- a/tests/test_batch_pbs_queue.py
+++ b/tests/test_batch_pbs_queue.py
@@ -136,8 +136,8 @@ def test_pbsqueue_get_name():
 
 def test_pbsqueue_get_priority_returns_value():
     queue = PBSQueue.__new__(PBSQueue)
-    queue._info = {"Priority": 5}
-    assert queue.getPriority() == 5
+    queue._info = {"Priority": "5"}
+    assert queue.getPriority() == "5"
 
 
 def test_pbsqueue_get_priority_returns_none():
@@ -148,7 +148,7 @@ def test_pbsqueue_get_priority_returns_none():
 
 def test_pbsqueue_get_total_jobs_with_value():
     queue = PBSQueue.__new__(PBSQueue)
-    queue._info = {"total_jobs": 10}
+    queue._info = {"total_jobs": "10"}
     assert queue.getTotalJobs() == 10
 
 
@@ -160,7 +160,7 @@ def test_pbsqueue_get_total_jobs_default_none():
 
 def test_pbsqueue_get_running_jobs_with_value():
     queue = PBSQueue.__new__(PBSQueue)
-    queue._job_numbers = {"Running": 4}
+    queue._job_numbers = {"Running": "4"}
     assert queue.getRunningJobs() == 4
 
 
@@ -172,7 +172,7 @@ def test_pbsqueue_get_running_jobs_default_none():
 
 def test_pbsqueue_get_queued_jobs_with_value():
     queue = PBSQueue.__new__(PBSQueue)
-    queue._job_numbers = {"Queued": 7}
+    queue._job_numbers = {"Queued": "7"}
     assert queue.getQueuedJobs() == 7
 
 
@@ -185,11 +185,11 @@ def test_pbsqueue_get_queued_jobs_default_zero():
 def test_pbsqueue_get_other_jobs_sum_all_states():
     queue = PBSQueue.__new__(PBSQueue)
     queue._job_numbers = {
-        "Transit": 1,
-        "Held": 2,  # not counted as other
-        "Waiting": 3,  # not counted as other
-        "Exiting": 4,
-        "Begun": 5,
+        "Transit": "1",
+        "Held": "2",  # not counted as other
+        "Waiting": "3",  # not counted as other
+        "Exiting": "4",
+        "Begun": "5",
     }
     assert queue.getOtherJobs() == 10
 
@@ -306,7 +306,7 @@ def test_pbsqueue_set_job_numbers_parses_valid_state_count():
 
     queue._setJobNumbers()
 
-    assert queue._job_numbers == {"Running": 5, "Queued": 3, "Held": 1}
+    assert queue._job_numbers == {"Running": "5", "Queued": "3", "Held": "1"}
 
 
 def test_pbsqueue_set_job_numbers_handles_missing_state_count():
diff --git a/tests/test_cd_cli.py b/tests/test_cd_cli.py
index a6a217e..9cf185c 100644
--- a/tests/test_cd_cli.py
+++ b/tests/test_cd_cli.py
@@ -15,7 +15,7 @@
 @pytest.fixture(autouse=True)
 def register():
     BatchMeta._registry.clear()
-    BatchMeta.register(PBS)
+    BatchMeta.registerBatchSystem(PBS)
 
 
 def _make_jobinfo_with_info(info: dict[str, str]) -> PBSJob:
diff --git a/tests/test_clear.py b/tests/test_clear.py
index 2f8f2d8..7824539 100644
--- a/tests/test_clear.py
+++ b/tests/test_clear.py
@@ -121,7 +121,7 @@ def test_clearer_clear_deletes_only_safe_files(tmp_path):
 
         messages = [call.args[0] for call in mock_info.call_args_list]
         assert any("Removed" in msg and "qq file" in msg for msg in messages)
-        assert any("not safe to clear" in msg for msg in messages)
+        assert any("could not be safely cleared" in msg for msg in messages)
 
 
 def test_clearer_clear_deletes_no_files_are_safe(tmp_path):
diff --git a/tests/test_info_presenter.py b/tests/test_info_presenter.py
index 85c9974..6e478d8 100644
--- a/tests/test_info_presenter.py
+++ b/tests/test_info_presenter.py
@@ -163,12 +163,12 @@ def test_create_job_status_panel(sample_info):
     assert len(panel_group.renderables) == 3
 
     # panel
-    panel: Panel = panel_group.renderables[1]
+    panel = panel_group.renderables[1]
     assert isinstance(panel, Panel)
-    assert presenter._informer.info.job_id in panel.title.plain
+    assert presenter._informer.info.job_id in panel.title.plain  # ty: ignore
 
     # table
-    table: Table = panel.renderable
+    table = panel.renderable
     assert isinstance(table, Table)
     assert len(table.columns) == 2
 
diff --git a/tests/test_properties_info.py b/tests/test_properties_info.py
index aa8d217..b969c82 100644
--- a/tests/test_properties_info.py
+++ b/tests/test_properties_info.py
@@ -21,7 +21,7 @@
 
 @pytest.fixture(autouse=True)
 def register():
-    BatchMeta.register(PBS)
+    BatchMeta.registerBatchSystem(PBS)
 
 
 @pytest.fixture
diff --git a/tests/test_run_runner.py b/tests/test_run_runner.py
index e298f10..cb28eb6 100644
--- a/tests/test_run_runner.py
+++ b/tests/test_run_runner.py
@@ -210,7 +210,7 @@ def test_runner_handle_sigterm_performs_cleanup_and_exits():
     runner._cleanup.assert_called_once()
     mock_logger.error.assert_called_once_with("Execution was terminated by SIGTERM.")
     mock_exit.assert_called_once_with(143)
-    assert exc_info.value.code == 143  # ty: ignore[unresolved-attribute]
+    assert exc_info.value.code == 143
 
 
 def test_runner_cleanup_with_running_process():
diff --git a/tests/test_submit_cli.py b/tests/test_submit_cli.py
index 346d2d7..9c6baf0 100644
--- a/tests/test_submit_cli.py
+++ b/tests/test_submit_cli.py
@@ -42,6 +42,8 @@ def test_submit_successful(tmp_path):
         assert any("job123" in msg for msg in info_messages)
 
 
+# v0.7.0 - obsolete test - script validation is performed by click library itself
+"""
 def test_submit_script_does_not_exist(tmp_path):
     runner = CliRunner()
     missing_script = tmp_path / "missing.sh"
@@ -52,6 +54,7 @@ def test_submit_script_does_not_exist(tmp_path):
         assert result.exit_code == CFG.exit_codes.default
         error_messages = [call.args[0] for call in mock_logger.error.call_args_list]
         assert any("does not exist" in str(msg) for msg in error_messages)
+"""
 
 
 def test_submit_detects_runtime_files_and_aborts(tmp_path):
diff --git a/tests/test_submit_submitter.py b/tests/test_submit_submitter.py
index 9ff6328..8539ea6 100644
--- a/tests/test_submit_submitter.py
+++ b/tests/test_submit_submitter.py
@@ -275,9 +275,12 @@ def test_submitter_create_env_vars_dict_sets_all_required_variables_with_per_nod
     assert env[CFG.env_vars.batch_system] == str(submitter._batch_system)
     assert env[CFG.env_vars.input_dir] == str(submitter._input_dir)
     assert env[CFG.env_vars.nnodes] == str(submitter._resources.nnodes)
+    assert submitter._resources.ncpus_per_node is not None
+    assert submitter._resources.nnodes is not None
     assert env[CFG.env_vars.ncpus] == str(
         submitter._resources.ncpus_per_node * submitter._resources.nnodes
     )
+    assert submitter._resources.ngpus_per_node is not None
     assert env[CFG.env_vars.ngpus] == str(
         submitter._resources.ngpus_per_node * submitter._resources.nnodes
     )
diff --git a/uv.lock b/uv.lock
index 9ac3802..85c1d86 100644
--- a/uv.lock
+++ b/uv.lock
@@ -603,7 +603,7 @@ dev = [
     { name = "pytest-cov", specifier = ">=7.0.0" },
     { name = "ruff", specifier = ">=0.13.0" },
     { name = "snakeviz", specifier = ">=2.2.2" },
-    { name = "ty", specifier = ">=0.0.1a24" },
+    { name = "ty", specifier = ">=0.0.18" },
 ]
 
 [[package]]
@@ -720,27 +720,26 @@ wheels = [
 
 [[package]]
 name = "ty"
-version = "0.0.1a24"
-source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/fc/71/a1db0d604be8d0067342e7aad74ab0c7fec6bea20eb33b6a6324baabf45f/ty-0.0.1a24.tar.gz", hash = "sha256:3273c514df5b9954c9928ee93b6a0872d12310ea8de42249a6c197720853e096", size = 4386721, upload-time = "2025-10-23T13:33:29.729Z" }
-wheels = [
-    { url = "https://files.pythonhosted.org/packages/ab/89/21fb275cb676d3480b67fbbf6eb162aec200b4dcb10c7885bffc754dc73f/ty-0.0.1a24-py3-none-linux_armv6l.whl", hash = "sha256:d478cd02278b988d5767df5821a0f03b99ef848f6fc29e8c77f30e859b89c779", size = 8833903, upload-time = "2025-10-23T13:32:53.552Z" },
-    { url = "https://files.pythonhosted.org/packages/a2/22/beb127bce67fc2a1f3704b6b39505d77a7078a61becfbe10c5ee7ed9f5d8/ty-0.0.1a24-py3-none-macosx_10_12_x86_64.whl", hash = "sha256:de758790f05f0a3bb396da4c75f770c85ab3a46095ec188b830c916bd5a5bc10", size = 8691210, upload-time = "2025-10-23T13:32:55.706Z" },
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