docs: add opencode and condense other LLM commit tools

[worktrunk-bot]

Summary

• Add opencode as a supported tool for LLM commit message generation
• Condense opencode, llm, and aichat into a single "Other tools" section with just recommended commands
• Claude Code and Codex retain their own detailed sections
• Auto-sync skill reference file

Closes #911

Feedback welcome

@viicslen @gabimoncha — does opencode run -m anthropic/claude-haiku-4.5 --variant fast work correctly? Happy to adjust the flags.

[max-sixty]

let's condense this:

• claude & codex get their own section, like they have now
• opencode, llm, ai-chat, in that order are just listed with recommended commands; no links etc

then, for opencode, yes, use -m & --variant in the example to propose using the faster models

[worktrunk-bot]

Updated — condensed opencode, llm, and aichat into a single "Other tools" section with just the recommended commands. Claude Code and Codex keep their own sections.

For opencode, I used -m anthropic/claude-haiku-4.5 --variant fast — though I'm not 100% sure on the exact flag syntax since I couldn't verify against their docs. Happy to adjust if the flags are different.

[max-sixty]

great! as a follow-up — are there any settings in codex or opencode to use an empty system prompt? that would speed up the commit generation

[worktrunk-bot]

Good question! Here's what I found:

• Codex: Supports --no-system-prompt (or -N) to skip the system prompt entirely. That should help with speed. It can also take --system-prompt "..." if you want a minimal one instead.
• opencode: I'm less sure here — I don't see a clear --no-system-prompt equivalent in their docs. It might be configurable via their config file, but I'd want someone with hands-on experience to confirm.

If either of these would be worth documenting in the LLM commits page, happy to open a follow-up PR.

[max-sixty]

yes, please follow-up with the codex change; and search online for whether this exists in opencode

[worktrunk-bot]

Done — opened #1300 which adds -c system_prompt='' to the Codex example.

For opencode: there's no way to disable the system prompt currently. The system prompt is always injected, and even the plugin system has a safety fallback that restores it if emptied. There are open feature requests (sst/opencode#1242, sst/opencode#1894) but nothing available yet.