---
phase: 06.7-network-model-client-trust-fall-trigger
plan: 02
subsystem: server
tags: [server, colyseus, movement, protocol-v4]
requirements-completed: [REQ-SRV-03, REQ-SRV-14, REQ-CLI-08]
completed: 2026-05-17
commit: f9b02e3
---

# Phase 06.7 Plan 02: Server Movement Trust Summary

## Accomplishments

- Added server handling for `position_update` and `set_sprite_override`, including schema validation, authentication by Colyseus session, monotonic `seq` rejection, and rate-limit budgets.
- Changed the room tick path so player movement is no longer derived from server-held inputs. The server now broadcasts the client-reported `x`, `y`, `vx`, `vy`, `facing`, `anim_state`, `last_input_seq`, and `sprite_override`.
- Updated `game-logic` so per-player movement is skipped when no input is provided, while platform stepping still advances.
- Retired obsolete server-authoritative input tests and added focused unit/integration coverage for the Phase 06.7 movement model.

## Verification

- `pnpm -C apps/server exec vitest run test/rate-limit.test.ts test/position-update.test.ts test/sprite-override.test.ts test/layout-derive.test.ts` - PASS.
- `pnpm -C packages/game-logic exec vitest run test/step-pass-through.test.ts` - PASS.
- `pnpm -C packages/game-logic exec vitest run` - PASS, 13 files / 63 tests.
- `pnpm -C apps/server exec tsc --noEmit` - PASS.

## Blocked Checks

- `pnpm -C apps/server exec vitest run test/position-update.integ.test.ts test/protocol-v4-handshake.integ.test.ts` currently fails with Colyseus `seat reservation expired`.
- The same failure appears in unrelated existing integration tests such as `test/reconnect.integ.test.ts`, so this is tracked as an existing/local Colyseus matchmaking or dependency graph issue rather than a handler assertion failure.

## Review Concerns Closed

- Codex #1: explicit rate-limit budgets.
- Codex #2 server side: removed held-input reads from the room apply path.
- Codex #3: retired legacy server-authoritative tests.
- Codex #4 server side: protocol handshake tests moved to v4 expectations.
- Codex #6: pure game-logic pass-through when no input map is supplied.

## Self-Check: PASSED WITH INTEGRATION BLOCKER

The implemented server path and focused unit/type checks pass. Browser-level and Colyseus transport integration remains blocked by the existing `seat reservation expired` failure.