diff --git a/packages/skilllint/plugin_validator.py b/packages/skilllint/plugin_validator.py
index e64e3833..c9d50e25 100644
--- a/packages/skilllint/plugin_validator.py
+++ b/packages/skilllint/plugin_validator.py
@@ -1822,7 +1822,18 @@ def _validate_with_cache(
 # =============================================================================
 
 # Create Typer app
-app = typer.Typer(help="Validate Claude Code plugins and skills", add_completion=False)
+app = typer.Typer(
+    help="Validate Claude Code plugins and skills",
+    add_completion=False,
+    # Help is read by agents, so it must not wrap or truncate to the caller's
+    # terminal. Click uses terminal_width as the exact help width (otherwise
+    # min(terminal columns, 80) - 2; typer/_click/formatting.py). 800 matches the
+    # Typer apps in claude_skills (daily-releases, receiving-pr-reviews,
+    # create-merge-request-changelog); lines longer than 800 columns still wrap.
+    context_settings={"terminal_width": 800},
+    rich_markup_mode=None,
+    pretty_exceptions_enable=False,
+)
 app.add_typer(docs_app, name="docs")
 
 # Version option handled via callback
diff --git a/packages/skilllint/tests/test_cli.py b/packages/skilllint/tests/test_cli.py
index f25659d2..b71d5213 100644
--- a/packages/skilllint/tests/test_cli.py
+++ b/packages/skilllint/tests/test_cli.py
@@ -836,15 +836,14 @@ def test_check_help_lists_every_registered_platform(self, cli_runner: CliRunner)
         How: Render ``check --help`` and look for each ADAPTERS key in CLI form
         Why: Agents are told to read accepted platform names from this help
         """
-        result = cli_runner.invoke(plugin_validator.app, ["check", "--help"])
+        # A narrow terminal must not wrap or truncate help: the app fixes terminal_width.
+        result = cli_runner.invoke(plugin_validator.app, ["check", "--help"], env={"COLUMNS": "40"})
 
         assert result.exit_code == 0
         assert plugin_validator.ADAPTERS
         expected = ", ".join(sorted(plugin_validator.PLATFORM_CLI_IDS))
         assert expected == plugin_validator.PLATFORM_CHOICES
-        assert "Platform adapter. Choices:" in result.output
-        for choice in expected.split(", "):
-            assert choice in result.output
+        assert f"Platform adapter. Choices: {expected}" in result.output
 
     def test_hyphenated_third_party_platform_id_resolves_exactly(self, monkeypatch) -> None:
         """Registered adapter IDs containing hyphens remain directly selectable."""