Local agent settings don't override global settings #4217

Description

In my global config I have:

  "agent": {
    "plan": {
      "model": "anthropic/claude-sonnet-4-5",
      "permission": {
        "bash": {
          "echo *": "allow",
          "find *": "allow",
          "grep *": "allow",
          "rg *": "allow",
          "fd *": "allow",
          "head *": "allow",
          "tail *": "allow"
        }
      }
    },
    "build": {
      "model": "anthropic/claude-sonnet-4-5"
    }
  },

In a project local config I want to override the models with:

  "agent": {
    "plan": {
      "model": "github-copilot/claude-sonnet-4.5",
    },
    "build": {
      "model": "github-copilot/claude-sonnet-4.5"
    }
  },

However, this doesn't work. When I start opencode, I see that the globally configured models are being used for the build and plan agents. When I dump the config with opencode debug config in the project directory, I see that some settings from my project config were applied, but the agent settings were not.

My project local agent config is used if I remove the global agent overrides.

OpenCode version

1.0.58

Steps to reproduce

1. Override some of the built in agent config in ~/.config/opencode/opencode.json
2. Override the same build in agent config in <project>/opencode.json
3. Run opencode debug config and verify that the project local overrides weren't applied

Screenshot and/or share link

No response

Operating System

mac0S 26.1

Terminal

kitty