How do I install Unity API Documentation?

Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.

Does Unity API Documentation need an API key?

The publisher lists these environment variables: UNITY_VERSION, UNITY_PROJECT_PATH.

What transport does Unity API Documentation use?

Unity API Documentation runs locally over stdio.

When was Unity API Documentation last checked?

Last checked 2026-11-09. Accurate Unity API docs (2022/2023/6) for AI agents. Prevents hallucinated signatures.

Unity API Documentation MCP server

Power your agent

Add this server

The publisher's own command. Not a PlugMCP endpoint.

Add to Cursor Add to VS Code Run on PlugMCP

Host a copy with our keys and logs.

Local command

uvx unity-api-mcp==2.1.1

Credentials from the publisher

UNITY_VERSION — Unity version to serve: 2022, 2023, or 6 (default: auto-detect or 6)
UNITY_PROJECT_PATH — Path to Unity project for auto-detecting version from ProjectSettings/ProjectVersion.txt

Claude Code has no install link for a local command. Copy the command below and run it in a terminal.

shClaude Code

1UNITY_VERSION=<value> UNITY_PROJECT_PATH=<value> claude mcp add io.github.codeturion-unity-api-mcp -- uvx unity-api-mcp==2.1.1

Run in a terminal.

jsonClaude Desktop

1{2  "mcpServers": {3    "io.github.codeturion-unity-api-mcp": {4      "command": "uvx",5      "args": [6        "unity-api-mcp==2.1.1"7      ],8      "env": {9        "UNITY_VERSION": "<value>",10        "UNITY_PROJECT_PATH": "<value>"11      }12    }13  }14}

claude_desktop_config.json

Local · pypiPublisher installStep-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

Server facts

Local

Transport: stdio
Version: 2.1.1
API key

Tools

No tool list yet. Remote servers get one after the first health check.

FAQ

Questions

unity-api-mcp

MCP server that gives AI agents accurate Unity API documentation. Prevents hallucinated signatures, wrong namespaces, and deprecated API usage.

Supports Unity 6 (one database per minor stream), Unity 2023, and Unity 2022 LTS. Works with Claude Code, Cursor, Windsurf, or any MCP-compatible AI tool. No Unity installation required. See the supported versions. New Unity releases are detected and built automatically every week.

Quick Start

Add to your MCP config (.mcp.json, mcp.json, or your tool's MCP settings), setting UNITY_VERSION to match your project:

{
  "mcpServers": {
    "unity-api": {
      "command": "uvx",
      "args": ["unity-api-mcp"],
      "env": {
        "UNITY_VERSION": "6000.3"
      }
    }
  }
}

Valid values: a Unity 6 stream like "6000.3", or "6", "2023", "2022".

On first run the server downloads the correct database (~20-30 MB) to ~/.unity-api-mcp/.

How It Works

Version detection. The server figures out which Unity version to serve:

Priority	Source	Example
1	`UNITY_VERSION` env var	`"2022"`, `"6"`, `"6000.3"`, or `"6000.3.8f1"`
2	`UNITY_PROJECT_PATH`	Reads `ProjectSettings/ProjectVersion.txt`, maps `2022.3.62f1` to `"2022"`, `6000.3.8f1` to `"6000.3"`
3	Default	`"6"`

Database download. If the database for that version isn't cached locally, it downloads from GitHub. Unity 6 minor streams (6000.0, 6000.3, 6000.5, …) get their own per-stream database, falling back to the generic 6 database when a stream database isn't published. Cached databases are freshness-checked against the release on startup, so weekly rebuilds reach existing installs automatically.
Serve. All tool calls query the version-specific SQLite database. Every query returns in <15ms.

Each version has its own database with the correct signatures, deprecation warnings, and member lists for that release.

Tools

Tool	Purpose	Example
`search_unity_api`	Find APIs by keyword	"Tilemap SetTile", "async load scene"
`get_method_signature`	Exact signatures with all overloads	`UnityEngine.Physics.Raycast`
`get_namespace`	Resolve `using` directives	"SceneManager" -> `using UnityEngine.SceneManagement;`
`get_class_reference`	Full class reference card	"InputAction" -> all methods/fields/properties
`get_deprecation_warnings`	Check if an API is obsolete	"WWW" -> Use UnityWebRequest instead

Coverage

All UnityEngine and UnityEditor modules, plus packages parsed from C# source: Input System, Addressables, uGUI (incl. TextMeshPro on Unity 6), AI Navigation, and Netcode. ~42,500 records per Unity 6 database, ~500 deprecation warnings each.

Full version list: db-v1 release page. CI regenerates that table on every build. New Unity patches are detected and built automatically every Monday.

Does not cover third-party assets (DOTween, VContainer, Newtonsoft.Json). For those, rely on project source.

Benchmarks

Measured, not promised: 25 research questions across 3 testbeds, answered by 3 agent configs, every answer judged against ground truth verified in the source beforehand. The full harness lives in docs/benchmark/ and re-runs with one command.

Config	Correct	Partial	Wrong	Hallucinated APIs
MCP + targeted Read	24/25	1	0	0
Skilled (Grep+Read)	20/25	3	2	1
Naive (full Reads)	19/25	3	3	1

The one reproduced hallucination is instructive. Asked to list the overloads of SceneManager.LoadSceneAsync, both non-MCP agents invented single-parameter LoadSceneAsync(string) and LoadSceneAsync(int) overloads that do not exist. Code written against them does not compile. The MCP agent returned the exact four real overloads.

Why correctness and not token savings? Agentic tools are good at code search now. Claude Code has shipped a Grep tool from the start, and current models search first and then read a narrow line range, so raw token use was comparable across all configs in our runs. But exact overloads, namespaces, and deprecations are not in your project files at all. An agent without MCP can only infer them from usage examples, and when it infers wrong you pay with a broken build.

3 testbeds: a real Unity 6 game project (11 questions), pure Unity API lookups (8), and Unity Input System package source with 2,700 to 4,600 line files (6)
3 configs, same model and turn limit: MCP tools + Grep/Read, Grep/Read only, Read only
Ground truth verified by reading the source before any runs; answers judged by a separate model session against that ground truth; token usage taken from API usage fields
Run it yourself: python docs/benchmark/run.py --project <unity-project-path> (results from July 2026; agent behavior moves, so re-run before quoting)

CLAUDE.md Snippet

Add this to your project's CLAUDE.md (or equivalent instructions file). This step is important. Without it, the AI has the tools but won't know when to reach for them.

## Unity API Lookup (unity-api MCP)

Use the `unity-api` MCP tools to verify Unity API usage instead of guessing. **Do not hallucinate signatures.**

| When | Tool | Example |
|------|------|---------|
| Unsure about a method's parameters or return type | `get_method_signature` | `get_method_signature("UnityEngine.Tilemaps.Tilemap.SetTile")` |
| Need the `using` directive for a type | `get_namespace` | `get_namespace("SceneManager")` |
| Want to see all members on a class | `get_class_reference` | `get_class_reference("InputAction")` |
| Searching for an API by keyword | `search_unity_api` | `search_unity_api("async load scene")` |
| Checking if an API is deprecated | `get_deprecation_warnings` | `get_deprecation_warnings("FindObjectOfType")` |

**Rules:**
- Before writing a Unity API call you haven't used in this conversation, verify the signature with `get_method_signature`
- Before adding a `using` directive, verify with `get_namespace` if unsure
- Covers: all UnityEngine/UnityEditor modules, Input System, Addressables, uGUI/TextMeshPro, AI Navigation, Netcode
- Does NOT cover: DOTween, VContainer, Newtonsoft.Json (third-party)

Setup Details

Instead of setting UNITY_VERSION, you can point to your Unity project. The server reads ProjectSettings/ProjectVersion.txt automatically:

{
  "mcpServers": {
    "unity-api": {
      "command": "uvx",
      "args": ["unity-api-mcp"],
      "env": {
        "UNITY_PROJECT_PATH": "/path/to/your/unity-project"
      }
    }
  }
}

Using pip install:

pip install unity-api-mcp

{
  "mcpServers": {
    "unity-api": {
      "command": "unity-api-mcp",
      "args": [],
      "env": {
        "UNITY_VERSION": "6000.3"
      }
    }
  }
}

Variable	Purpose	Example
`UNITY_VERSION`	Unity version to serve	`6000.3`, `6000.3.8f1`, `6`, `2023`, `2022`
`UNITY_PROJECT_PATH`	Auto-detect version from project	`F:/Unity Projects/my-project`
`UNITY_INSTALL_PATH`	Override Unity install path (for `ingest` only)	`D:/Unity/6000.3.8f1`

If you want to build a database from your own Unity installation instead of downloading:

# Install with ingest dependencies
pip install unity-api-mcp[ingest]

# Windows
python -m unity_api_mcp.ingest --unity-version 6000.3 --unity-install "D:/Unity/6000.3.8f1" --project "F:/Unity Projects/MyProject"

# macOS
python -m unity_api_mcp.ingest --unity-version 6000.3 --unity-install "/Applications/Unity/Hub/Editor/6000.3.20f1" --project "/path/to/UnityProject"

# Legacy versions
python -m unity_api_mcp.ingest --unity-version 2022 --unity-install "D:/Unity/2022.3.62f1"

Databases are written to ~/.unity-api-mcp/unity_docs_{version}.db by default.

If an AI agent is setting this up for you:

Add unity-api-mcp to my MCP config using uvx with UNITY_VERSION set to match my project, append the CLAUDE.md snippet from the README, and verify with get_namespace("SceneManager").

unity-api-mcp/
├── src/unity_api_mcp/
│   ├── server.py          # MCP server (5 tools)
│   ├── db.py              # SQLite + FTS5 database layer
│   ├── version.py         # Version detection + DB download
│   ├── xml_parser.py      # Parse Unity XML IntelliSense files
│   ├── cs_doc_parser.py   # Parse C# doc comments from package source
│   ├── unity_paths.py     # Locate Unity install + package dirs
│   └── ingest.py          # CLI ingestion pipeline
└── pyproject.toml

Databases are stored in ~/.unity-api-mcp/ (downloaded on first run).

Troubleshooting

Problem	Fix
"Could not download Unity X database"	Check internet connection. Or build locally: `python -m unity_api_mcp.ingest --unity-version 2022`
Wrong API version being served	Set `UNITY_VERSION` explicitly. Check stderr: `unity-api-mcp: serving Unity <version> API docs`
Server won't start	Check `python --version` (needs 3.10+). Check path: `which unity-api-mcp` or `where unity-api-mcp`
`ModuleNotFoundError: No module named 'mcp.server.fastmcp'`	Version 2.1.0 or older installed mcp 2.x. Restart your MCP client, or run `uvx unity-api-mcp@latest`. With pip, run `pip install -U unity-api-mcp`.
Third-party packages return no results	DOTween, VContainer, Newtonsoft.Json are not indexed (third-party, not Unity packages)

Contact

Need a custom MCP server for your engine or framework? I build MCP tools that cut token waste and prevent hallucinations for AI-assisted game development. If you want something similar for your team's stack, reach out.

[email protected]

License

MIT

Add this server

Host a copy with our keys and logs.

Server facts

Tools

Questions

How do I install Unity API Documentation?

Does Unity API Documentation need an API key?

What transport does Unity API Documentation use?

When was Unity API Documentation last checked?

Documentation

unity-api-mcp

Quick Start

How It Works

Tools

Coverage

Benchmarks

CLAUDE.md Snippet

Setup Details

Troubleshooting

See Also

Contact

License