{"session": "28585272-a6c8-4e89-9ca9-459772bc64e0", "env": "main-hedy-lockwell", "command": "cd /Users/jessegall/projects/agent-journal/.claude/worktrees/update-lock && python3 -c \"import ast;ast.parse(open('tests/test_it_boots.py').read())\" && git add -A && git commit -q -m \"The server runs on a free-threaded Python wherever the machine has one, found on the PATH or in uv's folder, with the plain Python as the fallback when it does not come up; an install asks uv to fetch one\" && git fetch -q && git rebase origin/main 2>&1|tail -1; git log --format=%h -1; journal work end 130 --how \"free-threaded default, soaked\" 2>&1|tail -1; journal helper report \"Alfred: 4153 finished on branch parallel-answers (tip $(git log --format=%h -1), on origin/main); I ran no tests. Soak: 16 clients over 8 environments for 40 s each, mixing todo creates through /api/run, PreToolUse and PostToolUse hooks, dashboard and to-do lists, on python3.14t and on 3.14 with the GIL. Free-threaded: 32 req/s, 1 error. GIL: 25 req/s, 4 errors. So under writes and hooks it is no worse and 28 percent faster, but not 2.4 times: the writes serialise on the record locks, and the p50 of reads and hooks is higher there (hook 223 ms against 117 ms, dashboard 174 against 53), the p95 lower (dashboard 622 against 565, equal; hook-post 558 against 179 is worse). Nothing in the soak broke because of free threading. What the soak found, which hits both builds and wants to-dos of its own: (1) a hook for a session the server has not seen answers 500 'KeyError s10' (session race on first PreToolUse); (2) POST answers 500 'ValueError: read length must be non-negative or -1' once in a few hundred (a request body read with a bad length); (3) a to-do created through /api/run sometimes takes 20 to 28 seconds (p95), a lock wait: todo-create p95 19.7 s free-threaded, 28 s GIL. As you decided, it is now the default: engine/package.py free_threaded() finds python3.14t/3.15t/3.13t on the PATH or in uv's folder (JOURNAL_SERVER_PYTHON=gil forces the plain one, or names one); engine/viewer.py launch tries it first and, if the server does not come up on it, logs that and starts on the plain interpreter; an install or upgrade runs 'uv python install 3.14t' when uv exists and no free-threaded Python does (best effort, never fails the install; install.py finish). Only the server moves; engines and workers stay on the plain Python. Test I wrote and did not run: test_the_server_starts_on_a_free_threaded_interpreter_when_the_machine_has_one_and_falls_back_to_the_plain_one in tests/test_it_boots.py. Moving on to the paging phase.\" 2>&1|tail -1", "parts": ["cd /Users/jessegall/projects/agent-journal/.claude/worktrees/update-lock", "python3 -c \"import ast;ast.parse(open('tests/test_it_boots.py').read())\"", "git add -A", "git commit -q -m \"The server runs on a free-threaded Python wherever the machine has one, found on the PATH or in uv's folder, with the plain Python as the fallback when it does not come up; an install asks uv to fetch one\"", "git fetch -q", "git rebase origin/main 2>&1|tail -1", "git log --format=%h -1", "journal work end 130 --how \"free-threaded default, soaked\" 2>&1|tail -1", "journal helper report \"Alfred: 4153 finished on branch parallel-answers (tip $(git log --format=%h -1), on origin/main); I ran no tests. Soak: 16 clients over 8 environments for 40 s each, mixing todo creates through /api/run, PreToolUse and PostToolUse hooks, dashboard and to-do lists, on python3.14t and on 3.14 with the GIL. Free-threaded: 32 req/s, 1 error. GIL: 25 req/s, 4 errors. So under writes and hooks it is no worse and 28 percent faster, but not 2.4 times: the writes serialise on the record locks, and the p50 of reads and hooks is higher there (hook 223 ms against 117 ms, dashboard 174 against 53), the p95 lower (dashboard 622 against 565, equal; hook-post 558 against 179 is worse). Nothing in the soak broke because of free threading. What the soak found, which hits both builds and wants to-dos of its own: (1) a hook for a session the server has not seen answers 500 'KeyError s10' (session race on first PreToolUse); (2) POST answers 500 'ValueError: read length must be non-negative or -1' once in a few hundred (a request body read with a bad length); (3) a to-do created through /api/run sometimes takes 20 to 28 seconds (p95), a lock wait: todo-create p95 19.7 s free-threaded, 28 s GIL. As you decided, it is now the default: engine/package.py free_threaded() finds python3.14t/3.15t/3.13t on the PATH or in uv's folder (JOURNAL_SERVER_PYTHON=gil forces the plain one, or names one); engine/viewer.py launch tries it first and, if the server does not come up on it, logs that and starts on the plain interpreter; an install or upgrade runs 'uv python install 3.14t' when uv exists and no free-threaded Python does (best effort, never fails the install; install.py finish). Only the server moves; engines and workers stay on the plain Python. Test I wrote and did not run: test_the_server_starts_on_a_free_threaded_interpreter_when_the_machine_has_one_and_falls_back_to_the_plain_one in tests/test_it_boots.py. Moving on to the paging phase.\" 2>&1|tail -1"]}