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Subagent sessions created with model=undefined causing ProviderModelNotFoundError #33043
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Description
Description
All built-in subagent types (general, explore, code-reviewer, etc.) fail with ProviderModelNotFoundError when spawned via the task tool. The subagent session is created with model=undefined instead of inheriting the agent's configured model.
Steps to Reproduce
- Use any built-in subagent type via the
tasktool:task(description="test", subagent_type="general", prompt="read a file") - Observe the error:
ProviderModelNotFoundError - Check the opencode log at
~/.local/share/opencode/log/opencode.log
Log Evidence
message=created id=ses_... agent=general model=undefined ...
message="share subscriber failed" type=message.updated cause=Cause([Fail(ProviderModelNotFoundError)])
The model=undefined is visible in every subagent session creation log entry. The agent config correctly shows the model (e.g. deepseek/deepseek-v4-flash), but it is not passed to the spawned subagent session.
Agent Config (correct)
opencode debug agent general
"native": true,
"model": {
"providerID": "deepseek",
"modelID": "deepseek-v4-flash"
Environment
- opencode version: 1.17.8 (also tested on 1.17.2 — same issue)
- OS: macOS (darwin)
- Provider: deepseek
- Model: deepseek/deepseek-v4-flash
Workaround
All work must be done inline in the main thread — subagents cannot be used.
Reacted by Pierre Quinton
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github-actions commentedon Jun 20, 2026
This issue might be a duplicate of existing issues. Please check:
Necmttn commentedon Jun 21, 2026
Subagent spawn should record the model resolution chain before creating the child session: requested agent type, explicit override, parent model, agent config default, global default, final provider/model, and resolution source.
If the chain resolves to undefined, fail before child creation with an actionable config error. Regression cases should cover built-in subagents inheriting the parent model, explicit per-agent overrides, missing provider config, and resume/continuation of a spawned child.
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github-actions commentedon Aug 21, 2026
To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.