Calling `use_skill` tool switches agent to default_agent unexpectedly

[fancydirty]

Description

Problem When any agent calls the use_skill tool, it gets reset to the global model setting instead of keeping the agent's own configured model.

Evidence Before use_skill: ▣ Orchestrator · claude-opus-4-5-thinking-high After use_skill: ▣ Orchestrator · gemini-3-flash Impact

• Agents lose their model configuration after loading skills
• Subagents spawned in parallel get stuck when their model changes mid-task
• Skills become unusable for agents with custom model configurations Expected Behavior use_skill should load the skill content without changing the agent's model. Each agent should retain its configured model throughout its lifecycle.

Plugins

oh-my-opencode, oh-my-opencode-slim

OpenCode version

1.1.25

Steps to reproduce

1. Configure global model: "google/gemini-3-flash" in opencode.json
2. Configure an agent with a different model: orchestrator: { model: anthropic/claude-opus-4-5 }
3. Use that agent and call use_skill("some-skill")
4. Observed: Agent switches to global default model (gemini-3-flash)
5. Expected: Agent stays on its configured model (claude-opus-4-5)

Operating System

Ubuntu 22.04

Terminal

wsl