[Bug] TUI crashes with "Unknown data message" when parsing concurrent tool calls from MiniMax-M2.7 #19463

Description

Describe the bug

When using MiniMax-M2.7 as the main Plan agent, attempting to spawn multiple subagents concurrently results in a parsing error and a TUI crash. OpenCode seems unable to parse the parallel tool call response from the MiniMax API.

Steps to Reproduce

1. Set the Plan agent model to MiniMax-M2.7.
2. Provide a prompt that forces the agent to use multiple subagents at the same time (e.g., "Critique this plan from 4 different angles using 4 agents concurrently").
3. The model attempts to dispatch the tasks (Architecture, Performance, Data Integrity, Frontend/UX).
4. The TUI crashes and throws an Unknown data message error from the worker.

Expected Behavior

OpenCode should correctly parse the parallel tool calls/JSON returned by the MiniMax-M2.7 API, spawn the subagent sessions in the background, and allow the user to navigate them using the leader key (Ctrl + X).

Actual Behavior

The model catches the parsing issue internally, outputting: Thinking: El equipo tuvo errores de parsing. Voy a intentar una aproximación diferente...
Immediately after, the OpenCode TUI crashes with the following error related to the worker payload:

Unknown data message
at createUserMessage (/$bunfs/root/src/cli/cmd/tui/worker.js:235457:27)

Environment Context

• OS: macOS Tahoe 26.3.1 (Apple Silicon M4, 16GB RAM)
• Installation Method: Homebrew
• OpenCode Version: 1.3.3
• Model: MiniMax-M2.7

Additional Context

The issue seems strictly related to how the OpenCode parser handles the specific JSON structure or tool-call array format returned by the MiniMax M2.7 endpoint when dealing with parallel execution. Forcing the model to execute agents sequentially (one by one) via prompt engineering temporarily mitigates the crash.

Plugins

None (Core OpenCode TUI only)

OpenCode version

1.3.3

Steps to reproduce

1. Set the main Plan agent model to MiniMax-M2.7.
2. Give the agent a prompt that forces concurrent/parallel execution of multiple subagents (e.g., "Critique this plan using 4 agents in parallel: architecture, performance, data, and UX").
3. The model will attempt to dispatch the 4 tasks simultaneously.
4. The TUI immediately crashes with an Unknown data message error in the worker.js file because it fails to parse the parallel tool-call JSON from the MiniMax API.

Screenshot and/or share link

Operating System

macOS Tahoe 26.3.1 (Apple Silicon M4, 16GB RAM)

Terminal

iTerm2 Build 3.6.9