Subagent configured model not honored

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1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Configuring the model on the agent definitions seems to not work properly.
The docs mentions that you can put the model id, and the UI allows to choose the model, however, the inherit option is the one used.

If you ask the agent about the subagents run tool it will tell you that the only available options on the enum is “fast”, and if he forces the tool call fails (so the tool is documented wrong).

Steps to Reproduce

One way:

  • Ask the agent to run a subagent with a specific mode ID (ask him to force it).
  • The call will fail

Second way:

  • Configure the agent spec on .cursor/agents with a specific model like composer-1
  • Choose an agent that can run subagents, ie: Opus 4.5
  • Ask the agent to run the subagent
  • Cursor dashboard tells you that you have only used Opus 4.5

Expected Behavior

The subagent should run with the configured model, or enable the tool to receive a model id and run the subagent with that model.

Operating System

MacOS

Version Information

Version: 2.4.31 (Universal)
VSCode Version: 1.105.1
Commit: 3578107fdf149b00059ddad37048220e41681000
Date: 2026-02-08T07:42:24.999Z
Build Type: Stable
Release Track: Default
Electron: 39.2.7
Chromium: 142.0.7444.235
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Darwin arm64 25.2.0

For AI issues: which model did you use?

Opus 4.5

Does this stop you from using Cursor

No - Cursor works, but with this issue

1 Like
Feature Request: Recursive Subagents, CLI Support, and Flexible Model Selection for Task Tool
Bug: Subagents uses parent model not subagents model
3

Hey Gabriel! Thanks for reporting this — great writeup.

I’ve seen this pattern in several other threads: the subagent model config gets ignored, and the tool schema only allows “fast” instead of real model IDs like claude-opus-4.5.

@Colin report.

1 Like
4

Hey, thanks for the report.

This is a known issue. A few users have reported the same behavior where the model field in the subagent config is ignored, and the Task tool dropdown only accepts "fast". Related threads:

The team is aware. No ETA yet, but your report helps with prioritization. I’ll flag it internally.

7

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