What is blockbench-particles?

A workflow for adding particle effects such as smoke, fire, sparks, dust, snow, or magic to Blockbench models. It uses Bedrock's JSON particle format and can place effects on animation events or model locations.

Use it to create particle JSON, attach effects to bones or locators, preview them, and deliver them with animated game assets.

It connects visual effects to model animations and supports the formats used by Minecraft Bedrock and GeckoLib.

blockbench-particles — Skill for Claude Code by jasonjgardner

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add jasonjgardner/blockbench-mcp-project --skill blockbench-particles

Clone the repo

git clone --depth 1 https://github.com/jasonjgardner/blockbench-mcp-project

Made for: Claude Code.

Or install blockbench-mcp, the plugin that ships this one along with the rest of its 15 skills, 5 commands, 1 agent, 2 MCP servers.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/jasonjgardner/blockbench-mcp-project/blockbench-particles/github.svg)](https://agentmods.dev/skills/jasonjgardner/blockbench-mcp-project/blockbench-particles)

Your own site

<a href="https://agentmods.dev/skills/jasonjgardner/blockbench-mcp-project/blockbench-particles"><img src="https://agentmods.dev/badge/skills/jasonjgardner/blockbench-mcp-project/blockbench-particles/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/jasonjgardner/blockbench-mcp-project/blockbench-particles"><img src="https://agentmods.dev/badge/skills/jasonjgardner/blockbench-mcp-project/blockbench-particles.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 139 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,251 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00139	$0.02251
Opus 5.5	$0.00056	$0.00900
Sonnet 5.5	$0.00028	$0.00450
Haiku 4.5	$0.00014	$0.00225

Measured 1mo ago against content hash 140f8e8e93a3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

blockbench-particles scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/blockbench-particles/SKILL.md · 85 lines

How it starts

The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Blockbench Particles

Blockbench has one particle system: Bedrock particle effects, the JSON format Snowstorm edits. Blockbench previews them with Wintersky when a particle keyframe on an animation's Effects track fires, optionally at a locator on a bone. The same files run in Minecraft Bedrock, and GeckoLib animations carry the same keyframes to a mod's particle handler. Nothing else in Blockbench (glTF, OBJ, Java block models, Hytale) exports particles.

Load blockbench-use first. Particles ride on animations, so load blockbench-animation when the model has no clip yet.

1. Decide What Carries the Effect

Ask for the destination if it is unknown; it decides everything below.

Destination	Particles	Where the effect lives
Bedrock entity or attachable (`bedrock`)	Native	Particle JSON + locators in geometry + keyframes in animation JSON or controller states + `particle_effects` map in the client entity. See delivery.
GeckoLib (`geckolib_model`)	Keyframes only	Keyframes (effect, locator, script) export in the animation JSON; the mod's particle keyframe handler spawns real particles. Bedrock JSON here is only the Blockbench preview.
Generic Model / glTF, Java block/item, Hytale, OBJ	None	Fake the effect with geometry, emissive flipbook textures and bone keyframes, or leave it to the runtime. See non-particle targets.

Also settle the trigger before building, because Bedrock treats the two differently:

Animation keyframe (manage_particle_keyframes): fire-and-forget. Good for one-shots (impact sparks, a poof on landing, hearts). A looping emitter fired this way never stops in game, and a looping clip starts another one every cycle. For a continuous effect keyed on a looping clip, use looping: false with duration equal to the clip length, keyed at 0.
Animation controller state: the game starts the emitters on state entry and ends them on exit. This is the right home for sustained loops (a burning state, a casting state). The MCP tools do not edit controllers; add the entry in Blockbench's Animation Controllers panel or in the controller JSON (delivery).

Read the full file on GitHub · 85 lines

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

1mo ago First seen · 85 lines · 139 tokens per session scan A 140f8e8e93a3

Subscribe to this mod's changes

blockbench-particles is a skill published in the GitHub repository jasonjgardner/blockbench-mcp-project (27 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 139 tokens to every session and 2,251 once invoked, about $0.0006 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-25.

Game development blockbench blockbench-plugin mcp

blockbench-particles next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
blockbench-particlesjasonjgardner/blockbench-mcp-project	Skill	27	1mo ago	Apache-2.0	A	139	Claude Code
blockbench-mcp-modelingsosadly/blockbench-mcp	Skill	65	9d ago	MIT	A	150	Claude Code, Codex
img2blockbenchorca-gamedev/img2blockbench	Skill	30	16d ago	MIT	A	106	Codex
playtest-reportDonchitos/Claude-Code-Game-Studios	Skill	36k	18d ago	MIT	A	20	Claude Code
godot-signals-groupsgamedev-skills/awesome-gamedev-agent-skills	Skill	6.9k	9d ago	Apache-2.0	A	95	Claude Code
motionOpenDCAI/GameFactory-3A	Skill	1.0k	8d ago	Apache-2.0	A	0	Claude Code, Codex
unity-addressablesBesty0728/Unity-Skills	Skill	1.9k	yesterday	MIT	A	25	Claude Code, Codex