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Multiplayer Synchronization in Godot 4.3+ · jame581 | DecimalAI

codingby jame581

Multiplayer Synchronization in Godot 4.3+

jame581/multiplayer-sync

Source jame581/godotprompter ↗License MIT

Use when synchronizing multiplayer state — MultiplayerSynchronizer, interpolation, prediction, and lag compensation

SkillScore86Maintained

Automatic

Coding pack

Last verified 8/20/2026

What it changes

Passed 19 of 22 test cases with the skill, and 16 of 22 without it.

Without skill73%

With skill86%

Checks it passed that the model alone missed

Wrap the method using `Callable.From<int>(IsPeerInRange)`
Call `set_physics_process(is_multiplayer_authority())` in `_ready()`
State that setting delta_interval to 0 disables delta synchronization

3 fixed16 passed either way3 still failing0 broke

Pass-rate lift: +14 pp
Tokens: +145%
Agent turns: 0%
Response time: -11%

Model Measured 8/20/2026v1 · latest is v219 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

This benchmark measured an earlier version of the skill.

A newer attempt on gemini-3.8-flash on 10/20/2026 did not produce a publishable comparison (not comparable). The snapshot above is the previously measured run.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/jame581-multiplayer-sync/SKILL.md https://app.decimal.ai/s/jame581-multiplayer-sync/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add jame581-multiplayer-sync, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/jame581-multiplayer-sync/ and pins it in .decimal/skills.lock

decimalai skills add jame581-multiplayer-sync

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/jame581-multiplayer-sync/SKILL.md https://app.decimal.ai/s/jame581-multiplayer-sync/SKILL.md

Raw file: /s/jame581-multiplayer-sync/SKILL.md ↗ · machine-readable summary at /s/jame581-multiplayer-sync.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 3 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 3

Prompt

In Godot 4 property synchronization, developers might assume setting `delta_interval` to `-1` or `null` disables delta sync. How do you explicitly disable delta sync updates on a `MultiplayerSynchronizer`?

What was checked, without and with the skill
Checked	Without skill	With skill
State that setting delta_interval to 0 disables delta synchronization	Missed	Passed

case-04 · gemini-3.6-flash · 8/20/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md239 lines5 files

Multiplayer Synchronization in Godot 4.3+

All examples target Godot 4.3+ with no deprecated APIs. GDScript is shown first, then C#.

Related skills: multiplayer-basics for ENet setup, RPCs, and authority model, dedicated-server for headless export and deployment, physics-system for physics interpolation and RigidBody synchronization.

1. MultiplayerSynchronizer

MultiplayerSynchronizer is Godot's built-in node for replicating properties across the network. Add it as a child of the node whose state you want to share.

What It Does

Sends property values from the authority peer to all others at a configured interval
Supports both delta sync (only changed values) and full sync (all values every tick)
Allows visibility filters to control which peers receive updates

Replication Config in the Editor

Select the MultiplayerSynchronizer node in the scene tree.
In the Inspector, open Replication and click Add Property.
Pick the parent node path and property name (e.g. position, velocity).
Set Sync (send every interval) or Spawn (send only on spawn) per property.
Set the Replication Interval (seconds). 0 means every physics frame.

Key Properties

Property	Description
`replication_interval`	Seconds between full sync updates. `0` = every physics frame
`delta_interval`	Seconds between delta sync updates. `0` = disabled
`public_visibility`	When `true`, updates go to all peers (default)
`visibility_filters`	Array of `Callable`s; each returns `true` if a peer should receive updates

Delta vs Full Sync

Mode	How It Works	Best For
Full sync	Sends all configured properties every `replication_interval`	Simple objects, low property count

Track record

Benchmark

19 / 22

test cases passed, vs 16 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v6 — 10/17/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

jame581 / godotprompter

skills/multiplayer-sync/SKILL.md

View on GitHub ↗

License MITImported 10/17/2026Version v2Bundled 4 files

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jame581/multiplayer-basicsUse when implementing multiplayer — MultiplayerAPI, ENet/WebSocket peers, RPCs, and authority modelClose match0 pp pass-rate lift

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