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docs: document run_tool subprocess streaming pattern in CLAUDE.md

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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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revernomad17
2026-04-08 16:11:24 +07:00
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@@ -108,6 +108,8 @@ Pass 2 builds `ok_disk_names` — the set of disk names that already match the s
**`selection.json`** — GUI selection state file, tracked in git. Persists which mods/groups are selected between GUI sessions. Written by the GUI; safe to delete (GUI recreates it on next save).
**`run_tool` subprocess streaming:** Tool scripts are launched via `subprocess.Popen` (not `subprocess.run`) with `stdout=PIPE, stderr=STDOUT`, read line-by-line via `iter(proc.stdout.readline, "")`, and posted to the log queue immediately. Python's own output buffering is disabled with the `-u` flag and `PYTHONUNBUFFERED=1` in the environment — without these, output would batch inside the pipe and only appear when the script exits.
## Python Version Compatibility
Minimum is Python **3.9**. All files that use `X | Y` union type annotations **must** have `from __future__ import annotations` as the first import. Without it, the `|` syntax raises `TypeError` at runtime on Python < 3.10. Every module in `arma_modlist_tools/` already has it; any new CLI script you add must include it too.