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fix(runtime): pin MC_VERSION=1.21.4 + ground-truth probe + close-loop dig

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Two-pronged response to user-confirmed "bot stands still, doesn't actually
chop" on play.xmatic.team:

1. Pin protocol — .env now sets MC_VERSION=1.21.4. minecraft-data has
   wrong packet ID mappings for protocol 775 (server 26.1.2 via
   ViaBackwards 5.9.1) — see mineflayer#3888 and #3717. 1.21.5 also has
   an enchants decoder bug that breaks bot.dig. 1.21.4 is the last
   protocol mineflayer 4.37.1 can speak cleanly through VIA.

2. Don't trust dig success — runtime/actions.js chopNearestTree and
   runtime/skills/gather-stone.js now lookAt(face center)+forceLook,
   await collectBlock, then re-read the target block. If the log/stone
   is STILL there, return ok:false code:"silent_dig_failure" and
   blacklist the position. Prevents the curriculum from reporting
   "wood.16 in progress" while the world hasn't actually changed.

3. Defensive default — runtime/movement-profiles.js: canDig=false on
   every profile until dig is confirmed working live. Otherwise
   pathfinder schedules paths through must-dig blocks and the bot loops.

4. Ground-truth probe — runtime/skills/diagnose-physics.js dispatches
   forward/jump/dig probes and writes the result to the diary. New
   IPC command cmd:run-skill lets the operator (or a future curriculum
   trigger) fire any skill on demand; it waits for the current action
   to finish before dispatching. /tmp/pepa-runskill.mjs is a one-shot
   client.

Live probe on play.xmatic.team confirmed: forward Δ=0.003 over 2s
(BROKEN — server rejects movement packets), jump ΔY=0.42 (likely
physics jitter, not a real jump). Strongly suggests an anti-cheat
plugin gating bot-style movements server-side — beyond protocol pin.

npm test 124/124.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
mayatnikov
2026-05-26 11:51:43 +03:00
co-authored by Claude Opus 4.7
parent 19dc8e12c6
commit 86f0c1799e
9 changed files with 232 additions and 22 deletions
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runtime/movement-profiles.js
+11 -8
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@@ -19,16 +19,19 @@ export const PROFILES = Object.freeze({
});
// Pure descriptors — safe to import without a live bot.
//
// canDig is FALSE everywhere by default (2026-05-26). On the live server
// (play.xmatic.team 26.1.2+ViaBackwards 5.9.1) bot.dig silently fails —
// the packet ID table for protocol 775 is wrong in minecraft-data
// (mineflayer#3888) — so pathfinder would schedule paths through
// must-dig blocks the bot can't actually break, and we'd loop. Once
// 1.21.4 pin + lookAt+wait fix is verified live, we can re-enable
// canDig for gather/travel profiles.
export const PROFILE_DEFAULTS = Object.freeze({
[PROFILES.GATHER]: { canDig: true, canPlace: false, allow1by1towers: false },
[PROFILES.TRAVEL]: { canDig: true, canPlace: false, allow1by1towers: false },
// canDig:true on flee is deliberate — observed live: flee with canDig=false
// in dense canopy leaves the bot perched in leaves indefinitely.
[PROFILES.FLEE]: { canDig: true, canPlace: false, allow1by1towers: false, maxDropDown: 8 },
// Build: don't accidentally mine the structure we're placing; allow
// 1x1 step-ups so shelter blueprints can layer.
[PROFILES.GATHER]: { canDig: false, canPlace: false, allow1by1towers: false },
[PROFILES.TRAVEL]: { canDig: false, canPlace: false, allow1by1towers: false },
[PROFILES.FLEE]: { canDig: false, canPlace: false, allow1by1towers: false, maxDropDown: 8 },
[PROFILES.BUILD]: { canDig: false, canPlace: true, allow1by1towers: true },
// Return: don't carve tunnels home or place stepping blocks; just walk.
[PROFILES.RETURN_TO_BASE]: { canDig: false, canPlace: false, allow1by1towers: false },
});