plan mode: prompt attempts workspace edits despite denied edit permission #37394

Summary

In plan mode, entering a prompt can cause opencode to attempt writing or applying changes to workspace files. When edit permission is denied, the request fails instead of remaining read-only or asking for permission appropriately.

Environment

• opencode version: 1.17.18
• OS: Darwin 25.5.0 (Darwin 25.5.0, arm64)
• Terminal: Ghostty, TERM=xterm-256color, COLORTERM=truecolor
• Shell: /bin/zsh
• Install/channel: Unavailable: executable output did not identify the install channel
• Active plugins: None configured in the inspected project and user configs; the previously listed /Users/billyhawkes/Projects/211-search/tmp/luna-fix.ts file was not present when inspected

Reproduction

1. Start opencode in plan mode.
2. Enter a prompt that causes the session to produce or apply a workspace change.
3. Observe the resulting permission error.

Expected Behavior

Plan mode should not write to workspace files. It should either keep the proposed changes in the plan/session view or explicitly request edit permission before attempting a file operation.

Actual Behavior

The prompt causes opencode to attempt to write to files. The operation fails with:

# Patch failed
Permission denied: edit
I can’t apply the session view because workspace edit permission was denied twice before any files were changed.

Additional Context

The failure was observed while entering a prompt in plan mode. No files were changed because edit permission was denied twice. Reproduction frequency, the exact prompt, and whether the issue occurs in every workspace are not yet confirmed.