external_directory permission triggered for .opencode/state within git worktree #7758

Summary

When running opencode from a subdirectory (e.g., packages/lib-relay in a monorepo), accessing .opencode/state/ at the project root triggers external_directory permission prompts—even though the path is within the git worktree.

Reproduction

cd ~/Code/project/packages/some-package  # subdirectory of git repo
opencode run --command some-command feature-name
# Prompts for external_directory permission to access:
# /path/to/project/.opencode/state/feature-name

Root Cause

In packages/opencode/src/file/read.ts:30:

if (!Filesystem.contains(Instance.directory, filepath))

• Instance.directory = CWD (packages/some-package)
• Instance.worktree = git root (correctly identified)
• Containment check uses CWD, not worktree

Paths within the git worktree but outside CWD are treated as external.

Expected Behavior

Paths within Instance.worktree (especially .opencode/ directories) should not trigger external_directory permission. Similar to how Truncate.DIR is auto-allowed in agent.ts:223.

Suggested Fix

Either:

1. Check containment against both Instance.directory and Instance.worktree
2. Auto-allow .opencode/** paths within the worktree (like Truncate.DIR)

Workarounds

• Run from project root
• Add to project opencode.json:

{
  "permission": {
    "external_directory": {
      "**/.opencode/**": "allow"
    }
  }
}