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[hooks] turn_id extension for Stop & UserPromptSubmit (#15118)
## Description Adding an extension to the spec that exposes the turn_id to hook scripts. This is a codex-specific mechanic that allows connecting the hook runs with particular turns ## Testing hooks config / sample hooks to use. Extract this, rename codex -> .codex, and place this into a repo or your home folder. It includes: config.toml that enables hooks, hooks.json, and sample python hooks: [codex.zip](https://github.com/user-attachments/files/26102671/codex.zip) example run (note the turn_ids change between turns): ``` › hello • Running SessionStart hook: lighting the observatory SessionStart hook (completed) warning: Hi, I'm a session start hook for wizard-tower (startup). hook context: Startup context: A wimboltine stonpet is an exotic cuisine from hyperspace • Running UserPromptSubmit hook: lighting the observatory lanterns UserPromptSubmit hook (completed) warning: wizard-tower UserPromptSubmit demo inspected: hello for turn: 019d036d-c7fa-72d2-b6fd- 78878bfe34e4 hook context: Wizard Tower UserPromptSubmit demo fired. For this reply only, include the exact phrase 'observatory lanterns lit' near the end. • Aloha! Grateful to be here and ready to build with you. Show me what you want to tackle in wizard- tower, and we’ll surf the next wave together. observatory lanterns lit • Running Stop hook: back to shore Stop hook (completed) warning: Wizard Tower Stop hook reviewed the completed reply (170 chars) for turn: 019d036d-c7fa- 72d2-b6fd-78878bfe34e4 › what's a stonpet? • Running UserPromptSubmit hook: lighting the observatory lanterns UserPromptSubmit hook (completed) warning: wizard-tower UserPromptSubmit demo inspected: what's a stonpet? for turn: 019d036e-3164- 72c3-a170-98925564c4fc hook context: Wizard Tower UserPromptSubmit demo fired. For this reply only, include the exact phrase 'observatory lanterns lit' near the end. • A stonpet isn’t a standard real-world word, brah. In our shared context here, a wimboltine stonpet is an exotic cuisine from hyperspace, so “stonpet” sounds like the dish or food itself. If you want, we can totally invent the lore for it next. observatory lanterns lit • Running Stop hook: back to shore Stop hook (completed) warning: Wizard Tower Stop hook reviewed the completed reply (271 chars) for turn: 019d036e-3164- 72c3-a170-98925564c4fc ```
Andrei Eternal ·
2026-03-18 21:48:31 -07:00 -
[hooks] userpromptsubmit - hook before user's prompt is executed (#14626)
- this allows blocking the user's prompts from executing, and also prevents them from entering history - handles the edge case where you can both prevent the user's prompt AND add n amount of additionalContexts - refactors some old code into common.rs where hooks overlap functionality - refactors additionalContext being previously added to user messages, instead we use developer messages for them - handles queued messages correctly Sample hook for testing - if you write "[block-user-submit]" this hook will stop the thread: example run ``` › sup • Running UserPromptSubmit hook: reading the observatory notes UserPromptSubmit hook (completed) warning: wizard-tower UserPromptSubmit demo inspected: sup hook context: Wizard Tower UserPromptSubmit demo fired. For this reply only, include the exact phrase 'observatory lanterns lit' exactly once near the end. • Just riding the cosmic wave and ready to help, my friend. What are we building today? observatory lanterns lit › and [block-user-submit] • Running UserPromptSubmit hook: reading the observatory notes UserPromptSubmit hook (stopped) warning: wizard-tower UserPromptSubmit demo blocked the prompt on purpose. stop: Wizard Tower demo block: remove [block-user-submit] to continue. ``` .codex/config.toml ``` [features] codex_hooks = true ``` .codex/hooks.json ``` { "hooks": { "UserPromptSubmit": [ { "hooks": [ { "type": "command", "command": "/usr/bin/python3 .codex/hooks/user_prompt_submit_demo.py", "timeoutSec": 10, "statusMessage": "reading the observatory notes" } ] } ] } } ``` .codex/hooks/user_prompt_submit_demo.py ``` #!/usr/bin/env python3 import json import sys from pathlib import Path def prompt_from_payload(payload: dict) -> str: prompt = payload.get("prompt") if isinstance(prompt, str) and prompt.strip(): return prompt.strip() event = payload.get("event") if isinstance(event, dict): user_prompt = event.get("user_prompt") if isinstance(user_prompt, str): return user_prompt.strip() return "" def main() -> int: payload = json.load(sys.stdin) prompt = prompt_from_payload(payload) cwd = Path(payload.get("cwd", ".")).name or "wizard-tower" if "[block-user-submit]" in prompt: print( json.dumps( { "systemMessage": ( f"{cwd} UserPromptSubmit demo blocked the prompt on purpose." ), "decision": "block", "reason": ( "Wizard Tower demo block: remove [block-user-submit] to continue." ), } ) ) return 0 prompt_preview = prompt or "(empty prompt)" if len(prompt_preview) > 80: prompt_preview = f"{prompt_preview[:77]}..." print( json.dumps( { "systemMessage": ( f"{cwd} UserPromptSubmit demo inspected: {prompt_preview}" ), "hookSpecificOutput": { "hookEventName": "UserPromptSubmit", "additionalContext": ( "Wizard Tower UserPromptSubmit demo fired. " "For this reply only, include the exact phrase " "'observatory lanterns lit' exactly once near the end." ), }, } ) ) return 0 if __name__ == "__main__": raise SystemExit(main()) ```2026-03-17 22:09:22 -07:00 -
[hooks] stop continuation & stop_hook_active mechanics (#14532)
Stop hooks now receive `stop_hook_active` and enable stop hooks to loop forever if they'd like to. In the initial hooks PR, we implemented a simpler mechanic that the stop-blocking could only happen once in a row - support stop hook adding a continuation prompt to add a further task - if multiple stop-blocks happen that have continuation prompts, they are concatenated example run: ``` › hey :) • Running SessionStart hook: lighting the observatory SessionStart hook (completed) warning: Hi, I'm a session start hook for wizard-tower (startup). hook context: Startup context: A wimboltine stonpet is an exotic cuisine from hyperspace • Aloha :) Happy to jam with you. What are we building today? • Running Stop hook: updating the guards Stop hook (blocked) warning: Wizard Tower Stop hook continuing conversation feedback: cook the stonpet • Aloha, here’s the hyperspace move for cooking a wimboltine stonpet: 1. Sear the stonpet in a hot pan with moon-oil until the edges shimmer. 2. Add star-lime, black salt, and a little fermented nebula paste. 3. Lower the heat and let it braise for 8 cosmic minutes with a splash of comet broth. 4. Finish with sky herbs and serve over warm asteroid rice. The vibe: crispy outside, tender center, deep interdimensional savor. • Running Stop hook: updating the guards Stop hook (completed) warning: Wizard Tower Stop hook saw a second pass and stayed calm to avoid a loop. ``` .codex/config.toml ``` [features] codex_hooks = true ``` .codex/hooks.json ``` { "hooks": { "SessionStart": [ { "matcher": "startup|resume", "hooks": [ { "type": "command", "command": "/usr/bin/python3 .codex/hooks/session_start_demo.py", "timeoutSec": 10, "statusMessage": "lighting the observatory" } ] } ], "Stop": [ { "hooks": [ { "type": "command", "command": "/usr/bin/python3 .codex/hooks/stop_demo_block.py", "timeoutSec": 10, "statusMessage": "updating the guards" } ] } ] } } ``` .codex/hooks/session_start_demo.py ``` #!/usr/bin/env python3 import json import sys from pathlib import Path def main() -> int: payload = json.load(sys.stdin) cwd = Path(payload.get("cwd", ".")).name or "wizard-tower" source = payload.get("source", "startup") source_label = "resume" if source == "resume" else "startup" source_prefix = ( "Resume context:" if source == "resume" else "Startup context:" ) output = { "systemMessage": ( f"Hi, I'm a session start hook for {cwd} ({source_label})." ), "hookSpecificOutput": { "hookEventName": "SessionStart", "additionalContext": ( f"{source_prefix} A wimboltine stonpet is an exotic cuisine from hyperspace" ), }, } print(json.dumps(output)) return 0 if __name__ == "__main__": raise SystemExit(main()) ``` .codex/hooks/stop_demo_block.py ``` #!/usr/bin/env python3 import json import sys def main() -> int: payload = json.load(sys.stdin) stop_hook_active = payload.get("stop_hook_active", False) last_assistant_message = payload.get("last_assistant_message") or "" char_count = len(last_assistant_message.strip()) if stop_hook_active: system_message = ( "Wizard Tower Stop hook saw a second pass and stayed calm to avoid a loop." ) print(json.dumps({"systemMessage": system_message})) else: system_message = ( f"Wizard Tower Stop hook continuing conversation" ) print(json.dumps({"systemMessage": system_message, "decision": "block", "reason": "cook the stonpet"})) return 0 if __name__ == "__main__": raise SystemExit(main()) ```2026-03-13 15:51:19 -07:00 -
start of hooks engine (#13276)
(Experimental) This PR adds a first MVP for hooks, with SessionStart and Stop The core design is: - hooks live in a dedicated engine under codex-rs/hooks - each hook type has its own event-specific file - hook execution is synchronous and blocks normal turn progression while running - matching hooks run in parallel, then their results are aggregated into a normalized HookRunSummary On the AppServer side, hooks are exposed as operational metadata rather than transcript-native items: - new live notifications: hook/started, hook/completed - persisted/replayed hook results live on Turn.hookRuns - we intentionally did not add hook-specific ThreadItem variants Hooks messages are not persisted, they remain ephemeral. The context changes they add are (they get appended to the user's prompt)
2026-03-10 04:11:31 +00:00