A bridge for controlling Unity Tilemap, the system for building 2D levels from reusable grid-based tiles, from an AI agent.

Creating and editing 2D tilemaps and, when the extra package is installed, creating RuleTile assets.

It gives the agent access to tilemap work in an open Unity project, including optional rule tiles that automatically choose neighboring tiles.

tilemap — Skill for Claude Code and Codex by AlexeyPerov

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 AlexeyPerov/Unity-Open-MCP --skill tilemap

Clone the repo

git clone --depth 1 https://github.com/AlexeyPerov/Unity-Open-MCP

Made for: Claude Code, Codex.

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/alexeyperov/unity-open-mcp/tilemap/github.svg)](https://agentmods.dev/skills/alexeyperov/unity-open-mcp/tilemap)

Your own site

<a href="https://agentmods.dev/skills/alexeyperov/unity-open-mcp/tilemap"><img src="https://agentmods.dev/badge/skills/alexeyperov/unity-open-mcp/tilemap/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/alexeyperov/unity-open-mcp/tilemap"><img src="https://agentmods.dev/badge/skills/alexeyperov/unity-open-mcp/tilemap.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,437 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	$0.00000	$0.01437
Opus 5.5	$0.00000	$0.00575
Sonnet 5.5	$0.00000	$0.00287
Haiku 4.5	$0.00000	$0.00144

Measured 1mo ago against content hash 3e62f036a63a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

tilemap 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/extensions/tilemap/SKILL.md · 111 lines

How it starts

The opening of the file, as written. The whole thing — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Unity Open MCP — Tilemap Extension

Skill for AI agents driving the Unity Tilemap packages (com.unity.2d.tilemap + optional com.unity.2d.tilemap.extras for RuleTile) in a Unity project through the unity-open-mcp MCP server.

This domain is embedded in the bridge and opt-in. Its tools compile in only when the project has com.unity.2d.tilemap installed (the bridge sets the UNITY_OPEN_MCP_EXT_TILEMAP define automatically). The RuleTile tool additionally requires com.unity.2d.tilemap.extras — when extras is absent, tilemap_create_rule_tile returns a clear install error (tilemap_extras_required) instead of failing silently. The tool group is hidden from ListTools until the connected session activates it.

Preconditions

Unity Editor is open with the target project.
unity_open_mcp_ping returns connected: true.
The project has com.unity.2d.tilemap installed (it ships with the 2D template; verify in the Package Manager). For rule tiles, additionally install com.unity.2d.tilemap.extras. If capabilities reports the tilemap group as available: false, install the package and let the bridge recompile.
The tilemap tool group is activated — call unity_open_mcp_manage_tools(action="activate", group="tilemap") before invoking any tilemap_* tool. Fresh sessions start with two default-on groups (core and gate-and-verify); activate the other groups you need on demand.

Tool prefix

All tools in this pack use unity_open_mcp_tilemap_*. All five tools are mutating and run the full gate path; paths_hint is the host scene path (or includes the asset path for the asset-create tools).

Vocabulary

A Grid is the parent GameObject that lays out cells. Each Tilemap is a child GameObject holding a Tilemap component (the cell data) and a TilemapRenderer (the drawing). Multiple Tilemaps can share one Grid (e.g. "Ground", "Walls", "Decorations" layers).

A Tile is a ScriptableObject asset (a .asset) that bundles a Sprite + collider shape. A TileBase is the abstract base (Tile is one implementation; RuleTile is another). Painting is done by cell coordinate (x, y, z), where x / y are the grid cell and z is the layer plane (usually 0).

Read the full file on GitHub · 111 lines

Files

What ships with it

1 file 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.

SKILL.md.meta 155 B

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 · 111 lines · 0 tokens per session scan A 3e62f036a63a

Subscribe to this mod's changes

tilemap is a skill published in the GitHub repository AlexeyPerov/Unity-Open-MCP (17 stars, last pushed 14d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,437 tokens. 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 2026-08-31.

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