diff --git a/host-setup/bootstrap.ps1 b/host-setup/bootstrap.ps1
index 664312c5..d9afb285 100644
--- a/host-setup/bootstrap.ps1
+++ b/host-setup/bootstrap.ps1
@@ -481,7 +481,7 @@ function Invoke-Upgrade {
 # Installs only what is named, since the agent tools are never installed as a set nobody chose.
 function Invoke-AgentsInstall {
     if ($script:AGENT_NAMES.Count -eq 0) { die "-Agents takes the tools to install, separated by commas, or 'all'" }
-    if ($script:AGENT_NAMES -contains 'all') {
+    if ($script:AGENT_NAMES -ccontains 'all') {
         if ($script:AGENT_NAMES.Count -gt 1) { die "-Agents takes 'all' alone, or a list of tool names" }
         Invoke-Tool -Tool 'install-agents.ps1' -Arguments '-Install', '-All'
         return
diff --git a/host-setup/windows/install-agents.ps1 b/host-setup/windows/install-agents.ps1
index 3507ea9f..ba9c875f 100644
--- a/host-setup/windows/install-agents.ps1
+++ b/host-setup/windows/install-agents.ps1
@@ -372,7 +372,7 @@ $TOOLS = @(
 
 function Get-Tool {
     param([string]$ToolName)
-    return ($script:TOOLS | Where-Object { $_.Name -eq $ToolName } | Select-Object -First 1)
+    return ($script:TOOLS | Where-Object { $_.Name -ceq $ToolName } | Select-Object -First 1)
 }
 
 # --- Report ---
@@ -564,7 +564,7 @@ function Show-List {
 function Resolve-Selection {
     $names = @($script:TOOLS | ForEach-Object { $_.Name })
     foreach ($candidate in $script:WANT_TOOLS) {
-        if ($names -notcontains $candidate) { die "Unknown tool `"$candidate`", -List names the managed tools" }
+        if ($names -cnotcontains $candidate) { die "Unknown tool `"$candidate`", -List names the managed tools" }
     }
     if ($script:WANT_TOOLS.Count -eq 0) {
         if ($script:MODE -eq 'install' -and -not $script:INSTALL_ALL) {
@@ -573,7 +573,7 @@ function Resolve-Selection {
         return , $names
     }
     # Sorted into registry order rather than the order they were typed, so a run reads the same however it was asked for.
-    return , @($names | Where-Object { $script:WANT_TOOLS -contains $_ })
+    return , @($names | Where-Object { $script:WANT_TOOLS -ccontains $_ })
 }
 
 # The order the actions were given is not a contract, so more than one is a refusal rather than the last one winning.
diff --git a/tests/test_bootstrap.py b/tests/test_bootstrap.py
index cb99492d..859a12ee 100755
--- a/tests/test_bootstrap.py
+++ b/tests/test_bootstrap.py
@@ -1699,6 +1699,15 @@ def test_agents_a_name_holding_a_space_and_all_is_not_all(self) -> None:
                 self.assertEqual(result.returncode, 0, result.stderr)
                 self.assertIn(f"install-agents.sh --install <{given}>", self.agents_steps())
 
+    def test_agents_all_in_another_case_is_a_tool_name_not_the_keyword(self) -> None:
+        expected: list[str] = []
+        for given in ("ALL", "All"):
+            with self.subTest(given=given):
+                result = self.run_main(action="--agents", args=(given,))
+                self.assertEqual(result.returncode, 0, result.stderr)
+                expected.append(f"install-agents.sh --install {given}")
+                self.assertEqual(self.agents_steps(), expected)
+
     def test_agents_drops_empty_names_from_the_list(self) -> None:
         result = self.run_main(action="--agents", args=("herdr,,cswap,",))
         self.assertEqual(result.returncode, 0, result.stderr)
@@ -1879,6 +1888,15 @@ def test_all_alone_hands_off_as_an_install_of_all(self) -> None:
         self.assertEqual(result.returncode, 0, result.stderr)
         self.assertEqual(self.steps(), ["install-agents.ps1 -Install -All"], result.stdout)
 
+    def test_all_in_another_case_is_a_tool_name_not_the_keyword(self) -> None:
+        expected: list[str] = []
+        for given in ("ALL", "All"):
+            with self.subTest(given=given):
+                result = self.run_agents([given])
+                self.assertEqual(result.returncode, 0, result.stderr)
+                expected.append(f"install-agents.ps1 -Install {given}")
+                self.assertEqual(self.steps(), expected, result.stdout)
+
     def test_all_beside_other_names_is_refused(self) -> None:
         result = self.run_agents(["all,herdr"])
         self.assertNotEqual(result.returncode, 0)
diff --git a/tests/test_install_agents.py b/tests/test_install_agents.py
index 669bc443..38fe9d08 100755
--- a/tests/test_install_agents.py
+++ b/tests/test_install_agents.py
@@ -238,6 +238,7 @@ def test_refusals(self) -> None:
             (("--upgrade", "--json"), "applies only to --report"),
             (("--upgrade", "--all"), "--all names every tool for --install"),
             (("--report", "nosuch"), 'Unknown tool "nosuch"'),
+            (("--report", "Herdr"), 'Unknown tool "Herdr"'),
             (("--report", "--upgrade"), "More than one action"),
         ]:
             with self.subTest(arguments=arguments):
@@ -367,6 +368,7 @@ def test_refusals(self) -> None:
             (("-Upgrade", "-All"), "-All names every tool for -Install"),
             (("-Install", "-All", "herdr"), "-All and a tool name were both given"),
             (("-Report", "nosuch"), 'Unknown tool "nosuch"'),
+            (("-Report", "Herdr"), 'Unknown tool "Herdr"'),
         ]:
             with self.subTest(arguments=arguments):
                 result = self.run_script(*arguments)