Remove legacy codex exec --json format (#4525)
`codex exec --json` now maps to the behavior of `codex exec
--experimental-json` with new event and item shapes.
Thread events:
- thread.started
- turn.started
- turn.completed
- turn.failed
- item.started
- item.updated
- item.completed
Item types:
- assistant_message
- reasoning
- command_execution
- file_change
- mcp_tool_call
- web_search
- todo_list
- error
Sample output:
<details>
`codex exec "list my assigned github issues" --json | jq`
```
{
"type": "thread.started",
"thread_id": "01999ce5-f229-7661-8570-53312bd47ea3"
}
{
"type": "turn.started"
}
{
"type": "item.completed",
"item": {
"id": "item_0",
"item_type": "reasoning",
"text": "**Planning to list assigned GitHub issues**"
}
}
{
"type": "item.started",
"item": {
"id": "item_1",
"item_type": "mcp_tool_call",
"server": "github",
"tool": "search_issues",
"status": "in_progress"
}
}
{
"type": "item.completed",
"item": {
"id": "item_1",
"item_type": "mcp_tool_call",
"server": "github",
"tool": "search_issues",
"status": "completed"
}
}
{
"type": "item.completed",
"item": {
"id": "item_2",
"item_type": "reasoning",
"text": "**Organizing final message structure**"
}
}
{
"type": "item.completed",
"item": {
"id": "item_3",
"item_type": "assistant_message",
"text": "**Assigned Issues**\n- openai/codex#3267 – “stream error: stream disconnected before completion…” (bug) – last update 2025-09-08\n- openai/codex#3257 – “You've hit your usage limit. Try again in 4 days 20 hours 9 minutes.” – last update 2025-09-23\n- openai/codex#3054 – “reqwest SSL panic (library has no ciphers)” (bug) – last update 2025-09-03\n- openai/codex#3051 – “thread 'main' panicked at linux-sandbox/src/linux_run_main.rs:53:5:” (bug) – last update 2025-09-10\n- openai/codex#3004 – “Auto-compact when approaching context limit” (enhancement) – last update 2025-09-26\n- openai/codex#2916 – “Feature request: Add OpenAI service tier support for cost optimization” – last update 2025-09-12\n- openai/codex#1581 – “stream error: stream disconnected before completion: stream closed before response.complete; retrying...” (bug) – last update 2025-09-17"
}
}
{
"type": "turn.completed",
"usage": {
"input_tokens": 34785,
"cached_input_tokens": 12544,
"output_tokens": 560
}
}
```
</details>
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