Add GPT-5 Codex system prompt template

[enyst]

This PR adds a new system_prompt_gpt_5_codex.j2 template tailored for GPT-5 Codex usage within the OpenHands Software Agent SDK.

Key points:

• Integrates the GPT-5 Codex prompt structure (from gpt-5.2-codex_prompt.md).
• Adapts it to OpenHands environment by including:
  • OpenHands agent introduction.
  • task_tracker tool usage (replacing Codex's "Plan tool" description where appropriate).
  • apply_patch tool usage description compatible with OpenHands.
  • AGENTS.md spec support.
  • Security policies.
• Focuses on "Editing constraints", "Frontend tasks", and "Presenting your work" as per the Codex prompt guidelines.

This template is intended for the Codex variant of GPT-5 agent.

@enyst can click here to continue refining the PR

---

Agent Server images for this PR

• GHCR package: https://github.com/OpenHands/agent-sdk/pkgs/container/agent-server

Variants & Base Images

Variant	Architectures	Base Image	Docs / Tags
java	amd64, arm64	eclipse-temurin:17-jdk	Link
python	amd64, arm64	nikolaik/python-nodejs:python3.12-nodejs22	Link
golang	amd64, arm64	golang:1.21-bookworm	Link

Pull (multi-arch manifest)

# Each variant is a multi-arch manifest supporting both amd64 and arm64
docker pull ghcr.io/openhands/agent-server:5549cb8-python

Run

docker run -it --rm \
  -p 8000:8000 \
  --name agent-server-5549cb8-python \
  ghcr.io/openhands/agent-server:5549cb8-python

All tags pushed for this build

ghcr.io/openhands/agent-server:5549cb8-golang-amd64
ghcr.io/openhands/agent-server:5549cb8-golang_tag_1.21-bookworm-amd64
ghcr.io/openhands/agent-server:5549cb8-golang-arm64
ghcr.io/openhands/agent-server:5549cb8-golang_tag_1.21-bookworm-arm64
ghcr.io/openhands/agent-server:5549cb8-java-amd64
ghcr.io/openhands/agent-server:5549cb8-eclipse-temurin_tag_17-jdk-amd64
ghcr.io/openhands/agent-server:5549cb8-java-arm64
ghcr.io/openhands/agent-server:5549cb8-eclipse-temurin_tag_17-jdk-arm64
ghcr.io/openhands/agent-server:5549cb8-python-amd64
ghcr.io/openhands/agent-server:5549cb8-nikolaik_s_python-nodejs_tag_python3.12-nodejs22-amd64
ghcr.io/openhands/agent-server:5549cb8-python-arm64
ghcr.io/openhands/agent-server:5549cb8-nikolaik_s_python-nodejs_tag_python3.12-nodejs22-arm64
ghcr.io/openhands/agent-server:5549cb8-golang
ghcr.io/openhands/agent-server:5549cb8-java
ghcr.io/openhands/agent-server:5549cb8-python

About Multi-Architecture Support

• Each variant tag (e.g., 5549cb8-python) is a multi-arch manifest supporting both amd64 and arm64
• Docker automatically pulls the correct architecture for your platform
• Individual architecture tags (e.g., 5549cb8-python-amd64) are also available if needed

[all-hands-bot]

Found several issues that should be addressed, particularly missing critical guidance sections. Details in inline comments.

[all-hands-bot]

🔴 Critical: This template is missing several essential sections that are present in the main system_prompt.j2:

• VERSION_CONTROL: Git best practices, commit guidelines, handling of git credentials
• PULL_REQUESTS: Important guidance about not pushing to main, PR management
• CODE_QUALITY: Clean code principles, minimal changes, import placement
• EFFICIENCY: Combining actions, using efficient tools
• FILE_SYSTEM_GUIDELINES: Proper file handling, not creating multiple file versions
• ROLE: Clarifying the agent's purpose and behavior

While this template includes some git guidance in the "Editing constraints" section (lines 34-41), it's much less comprehensive. Without these sections, the agent may:

• Push directly to main branch
• Create inefficient multi-file versions (file_v1.py, file_v2.py, etc.)
• Make overly defensive code changes
• Not properly handle git credentials

Recommendation: Either include these sections or document why they're intentionally excluded for GPT-5 Codex. If the intention is that this template extends the base template, that should be clearly documented.

[enyst]

Without these sections, the agent may:

• Push directly to main branch
• Create inefficient multi-file versions (file_v1.py, file_v2.py, etc.)

Claude dear, that’s just you.

[all-hands-bot]

[Automatic Post]: It has been a while since there was any activity on this PR. @enyst, are you still working on it? If so, please go ahead, if not then please request review, close it, or request that someone else follow up.

[openhands-ai]

Looks like there are a few issues preventing this PR from being merged!

• GitHub Actions are failing:
  • Run tests

If you'd like me to help, just leave a comment, like

@OpenHands please fix the failing actions on PR #1759 at branch `gpt-5-codex-system-prompt`

Feel free to include any additional details that might help me get this PR into a better state.

_{^{You can manage your notification settings}}

[all-hands-bot]

[Automatic Post]: It has been a while since there was any activity on this PR. @enyst, are you still working on it? If so, please go ahead, if not then please request review, close it, or request that someone else follow up.

[neubig]

[automated message] @neubig assigned for review according to git blame