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Write a `.cs` script file (create or overwrite) with the provided C# code. Validates syntax via Roslyn before write — invalid code is rejected with error details and the file is left untouched. Refreshes the AssetDatabase and delivers the final result via `requestId` after Unity finishes the triggered compilation. Use 'script-read' to inspect existing content first.
Passed 16 of 19 test cases with the skill, and 6 of 19 without it.
and 9 more in the full report
12 fixed6 passed either way3 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 12 test cases the skill fixed. Same model, same prompt, with and without the skill.
When passing arguments stored in args.json to the script modification command in unity-mcp-cli, which flag should be used?
| Checked | Without skill | With skill |
|---|---|---|
| Specifies the --input-file flag followed by the argument file path. | Missed | Passed |
The instructions your model reads when the skill loads.
Updates or creates script file with the provided C# code. Does AssetDatabase.Refresh() at the end. Provides compilation error details if the code has syntax errors. Use 'script-read' tool to read existing script files first.
filePath — required .cs path.content — C# source. MUST pass ScriptUtils.IsValidCSharpSyntax.requestId — required for the processing/delivered-later contract.Creates any missing parent directories, writes the file, then calls AssetDatabase.Refresh and schedules a post-compilation notification so the final response is delivered after Unity finishes the recompile.
unity-mcp-cli run-tool script-update-or-create --input '{
"filePath": "string_value",
"content": "string_value"
}'
For complex input (multi-line strings, code), save the JSON to a file and use:
unity-mcp-cli run-tool script-update-or-create --input-file args.jsonOr pipe via stdin (recommended):
unity-mcp-cli run-tool script-update-or-create --input-file - <<'EOF' {"param": "value"} EOF
If unity-mcp-cli is not found, either install it globally (npm install -g unity-mcp-cli) or use npx unity-mcp-cli instead.
Read the /unity-initial-setup skill for detailed installation instructions.
test cases passed, vs 6 / 19 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.