vanilla_world_check.py (used by the light harness) defaulted to port 25671, so two parity runs on one machine failed with 'FAILED TO BIND TO PORT'. It now picks a free port unless --port is given. The save round trip, datafix and upgrade_world tools derived their port from the pid or a random number; they ask the OS for a free one like test_dedicated_server_parity does.
Fixes#461
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
datafix_scene_12.py builds one scene for 1.8 to 1.12 from per-era tables (blocks, entity ids and merged types, riding, equipment, potions, items probed on the server, achievements by command instead of advancements).
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
tools/datafix_scene_12.py builds it in 1.12 command syntax: the whole block id/data space, block entities, items, entities, player, scoreboard, advancements, maps and statistics (real ones from a bot, plus a few hand-written fixtures).
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Uncommitted changes the agent had in progress when it was stopped on
2026-10-12; may not build or pass its harnesses yet.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
ChunkHeightAndBiomeFix, ChunkProtoTickListFix, ChunkRenamesFix,
OverreachingTickFix, SpawnerDataFix, the world generation settings fixes
and the Caves & Cliffs biome and advancement renames, with the chunk's
Level tag and UNTAGGED_SPAWNER in the schema walker. A 1.17.1 sample
world upgrades as vanilla's.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Old server jars run on Mojang's own Java runtimes, pinned in
research-lock.json and installed beside the shared vanilla data.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The old server jars and the 22 worlds made from them are inputs, but they
lived in each worktree's .local and were lost when its outputs were
cleared. They now sit beside the shared vanilla data, written atomically,
and the harness generates any that are missing (under a lock, since
several worktrees may run it at once).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The fixes from 3076 to 3459 (game event, cat, frog, painting, goat, goat
horn, filtered text, POI, blending, spawn egg, effect duration, archaeology,
double-sided signs, the 1.20 experiment and chunk statuses), the block
entities their schemas add, and block entities' remainders (a decorated
pot's shards stay next to its sherds). The sample world generator logs in
to 1.18.2 to 1.19.4 servers and gates the scene by version.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
DataFixerUpper reads typed fields without taking them out of a record's
remainder, so a typed field a fix drops comes back on write with its value
from the record's last read: entities keep their old ArmorItems, HandItems,
body_armor_item, saddle, Trident and Particle next to the new fields, as
vanilla 26.3 writes them. Fixes that write and read entities refresh that
map. The area effect cloud particle moves to custom_particle (4420), boats
keep Type (BoatSplitFix's remainder update misses), and region files with a
short header read as empty, as vanilla's RegionFile does. The sample worlds
now use the item formats each version accepts and enable its experiments.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Uncommitted changes the agent had in progress when it was stopped; may not
build or pass its harnesses yet.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Ludovic Marie