enhance: improve filesystem & shell tools with pagination, fallback matching, and smarter output

tests/test_tool_validation.py

@@ -363,3 +363,44 @@ def test_cast_params_single_value_not_auto_wrapped_to_array() -> None:
     assert result["items"] == 5  # Not wrapped to [5]
     result = tool.cast_params({"items": "text"})
     assert result["items"] == "text"  # Not wrapped to ["text"]
+
+
+# --- ExecTool enhancement tests ---
+
+
+async def test_exec_always_returns_exit_code() -> None:
+    """Exit code should appear in output even on success (exit 0)."""
+    tool = ExecTool()
+    result = await tool.execute(command="echo hello")
+    assert "Exit code: 0" in result
+    assert "hello" in result
+
+
+async def test_exec_head_tail_truncation() -> None:
+    """Long output should preserve both head and tail."""
+    tool = ExecTool()
+    # Generate output that exceeds _MAX_OUTPUT
+    big = "A" * 6000 + "\n" + "B" * 6000
+    result = await tool.execute(command=f"echo '{big}'")
+    assert "chars truncated" in result
+    # Head portion should start with As
+    assert result.startswith("A")
+    # Tail portion should end with the exit code which comes after Bs
+    assert "Exit code:" in result
+
+
+async def test_exec_timeout_parameter() -> None:
+    """LLM-supplied timeout should override the constructor default."""
+    tool = ExecTool(timeout=60)
+    # A very short timeout should cause the command to be killed
+    result = await tool.execute(command="sleep 10", timeout=1)
+    assert "timed out" in result
+    assert "1 seconds" in result
+
+
+async def test_exec_timeout_capped_at_max() -> None:
+    """Timeout values above _MAX_TIMEOUT should be clamped."""
+    tool = ExecTool()
+    # Should not raise — just clamp to 600
+    result = await tool.execute(command="echo ok", timeout=9999)
+    assert "Exit code: 0" in result