feat: support for codex as external CLI

fix: improved handling of MCP token limits when handling CLI output

tests/test_clink_parsers.py

@@ -0,0 +1,22 @@
+import pytest
+
+from clink.parsers.base import ParserError
+from clink.parsers.codex import CodexJSONLParser
+
+
+def test_codex_parser_success():
+    parser = CodexJSONLParser()
+    stdout = """
+{"type":"item.completed","item":{"id":"item_0","type":"agent_message","text":"Hello"}}
+{"type":"turn.completed","usage":{"input_tokens":10,"output_tokens":5}}
+"""
+    parsed = parser.parse(stdout=stdout, stderr="")
+    assert parsed.content == "Hello"
+    assert parsed.metadata["usage"]["output_tokens"] == 5
+
+
+def test_codex_parser_requires_agent_message():
+    parser = CodexJSONLParser()
+    stdout = '{"type":"turn.completed"}'
+    with pytest.raises(ParserError):
+        parser.parse(stdout=stdout, stderr="")