Ensure claude is detected (#17)

Author: jackbayliss

src/AgentDetector.php

@@ -50,8 +50,9 @@ protected static function fromAiAgentEnvVar(): ?AgentResult
             return null;
         }
 
-        return AgentResult::forAgent(match ($aiAgent) {
-            'github-copilot', 'github-copilot-cli' => KnownAgent::Copilot,
+        return AgentResult::forAgent(match (true) {
+            in_array($aiAgent, ['github-copilot', 'github-copilot-cli']) => KnownAgent::Copilot,
+            str_starts_with($aiAgent, 'claude-code') => KnownAgent::Claude,
             default => $aiAgent,
         });
     }

tests/AgentDetectorTest.php

@@ -98,6 +98,16 @@
         ->and($result->knownAgent())->toBe(KnownAgent::Copilot);
 });
 
+it('detects claude via AI_AGENT claude-code prefix', function (): void {
+    putenv('AI_AGENT=claude-code/2.1.123/agent');
+
+    $result = AgentDetector::detect();
+
+    expect($result->isAgent)->toBeTrue()
+        ->and($result->name)->toBe('claude')
+        ->and($result->knownAgent())->toBe(KnownAgent::Claude);
+});
+
 it('detects v0 via AI_AGENT', function (): void {
     putenv('AI_AGENT=v0');