[Feature]: support slash command

[LumenYoung]

Before submitting

• I searched existing issues and did not find a duplicate.
• I am describing a concrete problem or use case, not just a vague idea.

Area

apps/web

Problem or use case

Hey, I think T3 Code is actually a very good UI, except for one thing that is completely missing but very core to development: supporting slash commands in Codex or Claude Code.

Currently, the development process is limited to conversation, but if you want more fine-grained control over slash commands (such as "compact," "goal-setting," and other things that would normally be done in a slash command UI), it's not available yet.

I did a quick inspection of the Codex implementation and found that by using the app server, it is actually possible to have slash commands integrated. The only problem is how we interact with it. I would like to ask whether such a feature could be considered for implementation, as that would be a great enhancement to productivity.

Proposed solution

I think the most native way of implementing this is to parse the incoming prompt when it begins with a forward slash. That slash command, along with the rest of the prompt, will be treated differently by invoking the command internally in the Codex App Server, which enables the usage of slash commands.

It would also be nice if we could parse the available slash commands from the Codex and add a completion, but that is optional.

Why this matters

Because slash command enables many different capabilities, such as compaction, it is very important. Also, Codex recently introduced goal setting with slash command, which is super useful for long-horizon tasks.

If I could not use this capability in the T3 code, I would have to open another terminal to access it instead of using it directly over T3 code. Therefore, it is very important that T3 code includes this capability.

Smallest useful scope

Just allow a custom field or a custom input field for a slash command, so that we could input the slash command alone without any additional prompt.

Alternatives considered

No response

Risks or tradeoffs

No response

Examples or references

No response

Contribution

• I would be open to helping implement this.

[sbking]

Genuinely, how is this not available yet? How are people actually using T3 Code effectively without /goal, /compact, etc?

[TheDarkSkyXD]

Genuinely, how is this not available yet? How are people actually using T3 Code effectively without /goal, /compact, etc?

Like for example if I add in skills I can't use the commands like /frontend-design skills that's the main issue.

[Toys0125]

I hate this is still an issue since the beginning and hasn't been made to allow passthrough of commands into the cli.

[nicholasmartin]

Genuinely, how is this not available yet? How are people actually using T3 Code effectively without /goal, /compact, etc?

Like for example if I add in skills I can't use the commands like /frontend-design skills that's the main issue.

You can still use the skills but the /slash command autocomplete and options does not show up at all which is very sad indeed.

[naxey]

Genuinely, how is this not available yet? How are people actually using T3 Code effectively without /goal, /compact, etc?

Like for example if I add in skills I can't use the commands like /frontend-design skills that's the main issue.

Regarding codex:
You would use $frontend-design for skills and it autocompletes just fine.
But +1 for adding passthrough of commands like /compact since the agent cant trigger them themselves. iirc claude already supports this in t3code

[doasfrancisco]

hello any updates on this?

how am i supposed to manage my mcps with /mcp in claude?

[respectTheCode]

Real question... How does anyone use codex without slash commands? I see the recommendation to use "$" but this only works for user level skills and does nothing for slash commands.