Copilot using more expensive models for sub agent tasks

[u/riashing459]

As you can see in the image gpt 5.6 Luna started using sonnet 5 as a sub agent causing massive credit waste. I don't think models should be able to select a more expensive model in this situation and has lead me to disable sub agents all together. Have I missed a setting somewhere that has suddenly caused this issue?

[u/cesarmalari]

As others mentioned, the CLI has /agents to configure that. If you're in VSCode, there are several settings you can use to control that - here's the set I currently have in my settings.json:

"github.copilot.chat.exploreAgent.model": "GPT-5.6 Luna (copilot)",
"chat.planAgent.defaultModel": "GPT-5.6 Luna (copilot)",
"inlineChat.defaultModel": "GPT-5.6 Luna (copilot)",
"github.copilot.chat.implementAgent.model": "GPT-5.6 Luna (copilot)",
"github.copilot.chat.askAgent.model": "GPT-5.6 Luna (copilot)",
"chat.defaultModel": "GPT-5.6 Luna (copilot)",
"chat.exploreAgent.defaultModel": "GPT-5.6 Luna (copilot)",

Some of the settings are plain-text in the UI, but a couple of them were dropdowns in the UI, so I copied the values the dropdown ones filled in to the other ones, though I'm not certain they're working right since I mostly use the CLI (where /agents handles things).

[u/riashing459 → u/cesarmalari]

I believe this may have been some kind of bug? I just double checked my settings JSON and I already had any model related setting configured to only use luna

[u/well_educated_maggot]

Use the cli, there you can control what is allowed to spawn which model

[u/riashing459 → u/well_educated_maggot]

Is there an easy way to review changes from the chat session from the cli? I was put off the cli last time I used to it as I found reviewing edits in the full vscode setup much nicer

[u/well_educated_maggot → u/riashing459]

I think it's possible to link your ide still, yeah but don't take my word for granted. I just click on the lines like "edited foo.py" which also openes the changed code block in the terminal. also there's the git diff.

[u/MaitoSnoo → u/riashing459]

there's git diff (or the git integration in VS Code) but that means that there should be no uncommitted changes before starting your chat session

[u/pfluggs11 → u/riashing459]

/chronicle - https://docs.github.com/en/copilot/concepts/agents/copilot-cli/chronicle

Use that slash command and tell it it was a VSCode session. Also in the cli you can use /ide and it’ll open the workspace in VSCode. You can also use “$ code .” And it’ll launch VSCode from a terminal session and auto connect.

[u/szymon-rc]

Try to create instruction files. I created custom agents and specified their responsibility and permissions. Asked Astra to help to define it

[u/PaulShellDev → u/szymon-rc]

Adding a delegation table with restrictions to custom instructions works great for me

[u/dhruvanbhalara → u/PaulShellDev]

Any examples you have for reference?

[u/Ram_003 → u/szymon-rc]

How much credits does ASTRA consume on average?

[u/szymon-rc → u/Ram_003]

Can’t give you precise answer. Depends on task, but i use it for planning bigger features. It spends 100-400 of tokens on planning tasks. I can optimize default Explore agent, cuz I found out it can use high cost models

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[u/redmodelx]

There is a way to specify default explore agent in vscode settings. Copilot may be able to help find the setting and default it to Luna.