tractor/ai/prompt-io/opencode/20260820T150250Z_9afda1c6_prompt_io.raw.md

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.