TUI/Desktop: Bun/Effect stack dumped as collapsible tool block on every tool call (Build · grok-4.6)

Description

On every tool call, the conversation pane inserts a collapsible block titled "Build · grok-4.6" with an OpenCode Bun/
Effect stack (not model output).

The block starts with "Click to collapse" and looks like:

  at A (B:/~BUN/root/chunk-k9zx24wq.js:67:13392)
  at <anonymous> (B:/~BUN/root/chunk-k9zx24wq.js:67:13895)
  at ~effect/Effect/evaluate (B:/~BUN/root/chunk-nhtrqkcr.js:25:4492)
  at runLoop (B:/~BUN/root/chunk-nhtrqkcr.js:25:2045)
  at evaluate (B:/~BUN/root/chunk-nhtrqkcr.js:25:1435)
  at <anonymous> (B:/~BUN/root/chunk-nhtrqkcr.js:25:5664)

The tools themselves usually complete (bash/edit/read succeed). The stack is not stored in the session DB or in
opencode.log — it only appears in the live UI.

This is not the same as #16841 (console.trace garbles the terminal; closed as not planned). Here the stack is rendered
as a collapsible tool/agent output block.

Provider: custom OpenAI-compatible grok-4.6 via @ai-sdk/openai (not official xAI).

Plugins

pebrel.js; MCP: reqable

OpenCode version

1.18.31

Steps to reproduce

1. Windows 11, OpenCode 1.18.31 TUI/Desktop
2. Select agent build and model grok-4.6 on a custom OpenAI-compatible provider (npm: @ai-sdk/openai)
3. Send a prompt that causes a tool call (bash / read / edit)
4. After the tool runs, a collapsible "Build · grok-4.6" block appears with the Bun/Effect stack above

Screenshot and/or share link

Operating System

Windows 11 (build 26200)

Terminal

powershell7