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.
npx skills add db-lyon/ue-mcp --skill ue-mcp-epic-routinggit clone --depth 1 https://github.com/db-lyon/ue-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/db-lyon/ue-mcp/ue-mcp-epic-routing)<a href="https://agentmods.dev/skills/db-lyon/ue-mcp/ue-mcp-epic-routing"><img src="https://agentmods.dev/badge/skills/db-lyon/ue-mcp/ue-mcp-epic-routing/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/db-lyon/ue-mcp/ue-mcp-epic-routing"><img src="https://agentmods.dev/badge/skills/db-lyon/ue-mcp/ue-mcp-epic-routing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00081 | $0.00669 |
| Opus 5 | $0.00041 | $0.00334 |
| Sonnet 5 | $0.00016 | $0.00134 |
| Haiku 4.5 | $0.00008 | $0.00067 |
Grade A, and why
ue-mcp-epic-routing 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 11d 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 — 38 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Epic-vs-native tool routing (ue-mcp)
ue-mcp exposes two overlapping surfaces. Picking the right one per task avoids slow, failure-prone paths.
- Native category actions -
blueprint(...),level(...),material(...), etc. Hand-written, idempotent, with rollback and structured errors. - Epic
epic_*actions - Epic's own MCP toolsets, surfaced in-category when the ToolsetRegistry is available (UE 5.8+ with the Epic toolset plugins enabled). Discover them withepic(action="status")andepic(action="list_toolsets").
This is not a blanket "always use epic" rule. Epic needs 5.8 + plugins, and much of ue-mcp has no epic equivalent or adds idempotency/rollback the raw tools lack.
The one that matters most: Blueprint graph bodies -> the DSL
Authoring the contents of a graph (event graph, function body, macro) is the headline case.
- Prefer
blueprint(action="epic_write_graph_dsl", ...). Callblueprint(action="epic_get_graph_dsl_docs")first to get the S-expression grammar. - It authors and compiles the whole graph in one call - materially faster and more reliable than node-by-node
add_node+connect_pins(typically one correct pass instead of several failed iterations).
Decision table
| Task | Route |
|---|---|
| Author/replace a graph body (nodes + wiring) | blueprint(epic_write_graph_dsl) (docs first) |
| Read / inspect a graph, list graphs/variables/functions | native blueprint(read*, list_*, get_execution_flow) |
| SCS components, reparenting, component properties | native blueprint(add_component, ...) |
| CDO / class defaults, tick settings | native blueprint(set_class_default, set_actor_tick_settings) |
| Interfaces, event dispatchers | native blueprint(create_interface, add_interface, add_event_dispatcher) |
| Structured compile / validate with diagnostics | native blueprint(compile, validate) |
A task with no native action but an epic_* one exists |
the epic_* action |
| A task with no epic equivalent | the native action |
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.
- 11d ago First seen · 38 lines · 81 tokens per session scan A ffb747acc350
ue-mcp-epic-routing is a skill published in the GitHub repository db-lyon/ue-mcp (324 stars, last pushed today), licensed MIT. It adds 81 tokens to every session and 669 once invoked, about $0.0004 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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