---
model: openai/gpt-5.6-sol
service: opencode
session: ses_3e4c90d3eafeqHEtRYSIHgHhpA
timestamp: 2026-08-19T02:07:57Z
git_ref: b38efed7
scope: code
substantive: true
raw_file: 20260819T020757Z_b38efed7_prompt_io.raw.md
---

## Prompt

Resolve the remaining P3 review finding before landing PR #481:
`runtime_kwargs={}` must not be silently accepted alongside either
`an=` or `portal=` merely because the dict is falsey. Keep this as its
own final review-remediation commit.

## Response summary

Treat any non-`None` `runtime_kwargs` value as provided when validating
placement. Cover both placement APIs with empty and configured dicts,
proving the error is raised locally before actor startup.

## Files changed

- `tractor/to_actor/_api.py` - validate option presence explicitly.
- `tests/test_to_actor.py` - cover four invalid option combinations.

## Human edits

No direct line edits. The human accepted the P3 finding, required it to
remain separate from the five P2 behavioral commits and prioritized it
before the final PR #484 integration rebase and PR #481 landing steps.