Borrowing it
Nothing to install: this file belongs to runeape-sats/unreal-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/runeape-sats/unreal-mcp/main/.github/skills/unreal-castle-builder/SKILL.mdgit clone --depth 1 https://github.com/runeape-sats/unreal-mcpWrote 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.
[](https://agentmods.dev/skills/runeape-sats/unreal-mcp/unreal-castle-builder)<a href="https://agentmods.dev/skills/runeape-sats/unreal-mcp/unreal-castle-builder"><img src="https://agentmods.dev/badge/skills/runeape-sats/unreal-mcp/unreal-castle-builder/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.
<a href="https://agentmods.dev/skills/runeape-sats/unreal-mcp/unreal-castle-builder"><img src="https://agentmods.dev/badge/skills/runeape-sats/unreal-mcp/unreal-castle-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00055 | $0.00591 |
| Opus 5 | $0.00028 | $0.00296 |
| Sonnet 5 | $0.00011 | $0.00118 |
| Haiku 4.5 | $0.00006 | $0.00059 |
Grade A, and why
unreal-castle-builder 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 12d 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.
How it starts
The opening of the file, as written. The whole thing — 40 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Unreal Castle Builder
When To Use
- Build a quick castle or fortress prototype in Unreal Engine from basic shapes.
- Teach another agent how to drive this repository through the direct CLI instead of MCP tool discovery.
- Verify that a generated castle actually exists in the current level by listing actors.
Procedure
- Inspect the CLI entrypoint first.
Run
unreal-mcp-cli --help. If the editable script is not installed yet, run.\.venv\Scripts\python.exe unreal_cli.py --helpinstead. - Inspect the castle-specific commands.
Run
unreal-mcp-cli create-basic-castle --helpandunreal-mcp-cli list-level-actors --help. Pay attention to the--layout,--size,--palette,--yaw, and--originoptions so the castle can vary without changing the required actor set. - Review the shared castle layout in examples/castle/assets/castle-plan.json.
- Create the castle with a unique prefix so verification is unambiguous.
Example:
unreal-mcp-cli create-basic-castle --prefix SkillCastle --layout courtyard --size grand --palette sandstone - Verify the result by listing actors with the same prefix.
Example:
unreal-mcp-cli list-level-actors --kwargs "filter=SkillCastle max_results=40" - Run the dedicated verification command.
Example:
unreal-mcp-cli verify-basic-castle --prefix SkillCastle - If the user asks for cleanup or a rebuild, inspect
unreal-mcp-cli reset-basic-castle --helpand use it with the same prefix. - Report the created actor count, any missing labels, and whether the castle is complete.
Expectations
- Do not save the level unless the user asks for it.
- Prefer a unique prefix per run to avoid collisions with prior castle attempts.
- Use named variation presets when the user asks for a different silhouette or mood; use
--originand--yawwhen the user asks for a different placement. - If verification fails, report the missing labels and stop instead of guessing.
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.
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.
- 12d ago First seen · 40 lines · 55 tokens per session scan A 3342d57eda93
unreal-castle-builder is a skill published in the GitHub repository runeape-sats/unreal-mcp (47 stars, last pushed 5mo ago), licensed MIT. It adds 55 tokens to every session and 591 once invoked, about $0.0003 per session on Opus 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 2026-08-30.
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