---
model: openai/gpt-5.6-sol
service: opencode
timestamp: 2026-08-20T15:02:50Z
git_ref: pformat_caller_frame_render_guard
diff_cmd: git diff HEAD~1..HEAD
---

## Prompt

After reviewing additional `tractor.devx.pformat` work suitable for
PR #503, the user approved fixing both send-side `MsgTypeError`
formatting failures and adding an end-to-end regression.

## Response

The generated code corrects the `MsgCodec.msg_spec_str` formatter
input, keeps `_mk_send_mte()`'s assembled default message a string,
and tests that the resulting `MsgTypeError` can be rendered:

> `git diff HEAD~1..HEAD -- tractor/msg/_codec.py tractor/_exceptions.py tests/devx/test_pformat.py`

These failures were hidden behind the original
`pformat_caller_frame()` keyword error addressed by the first two
commits on the branch.