Borrowing it
Nothing to install: this file belongs to db-lyon/ue-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/db-lyon/ue-mcp/main/CLAUDE.mdgit 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/instructions/db-lyon/ue-mcp/claude-md)<a href="https://agentmods.dev/instructions/db-lyon/ue-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/db-lyon/ue-mcp/claude-md/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/instructions/db-lyon/ue-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/db-lyon/ue-mcp/claude-md.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 | $0.07277 | $0.07277 |
| Opus 5.5 | $0.02911 | $0.02911 |
| Sonnet 5.5 | $0.01455 | $0.01455 |
| Haiku 4.5 | $0.00728 | $0.00728 |
Grade A, and why
ue-mcp CLAUDE.md 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 today.
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 — 266 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
Operating guide for Claude Code (and any AI agent) working in this repo. Shared team knowledge - checked into the repo so every contributor gets the same rulebook.
Repo at a glance
- TS server (
src/) - the MCP server. Wraps the UE bridge over WebSocket, exposes 30 category tools with 2111+ actions. The numbers between those markers are stamped byscripts/generate-tool-metadata.tsfromALL_TOOLS; do not hand-edit them, and do not remove the markers, because a hand-written count here is the first thing every agent reads and the last thing anyone remembers to update. - C++ plugin (
plugin/ue_mcp_bridge/) - the editor-side bridge. Lives inPrivate/Handlers/<Category>/*.cpp, registers actions withFMCPHandlerRegistry. - Test project (
tests/ue_mcp/) - the dedicated UE project used for smoke testing. The plugin is deployed here fromplugin/via the deployer. This is the only safe target for live tests. - Docs (
docs/) - MkDocs site. Release bodies are drafted outside the repo (see Release process).
Edit only under plugin/ue_mcp_bridge/. The deployer syncs to tests/ue_mcp/Plugins/UE_MCP_Bridge/ - never hand-copy.
The in-editor client lives elsewhere
The paid in-editor client (its UI, the daemon extension that runs its agent, the UE_MCP_Studio editor plugin, the model gateway and billing) lives in the private db-lyon/ue-mcp-studio repo. Dependencies run one way:
- This repo never depends on it, imports from it, or carries code only it needs. A feature Studio wants goes in here as a general one the free path can use.
- Studio reaches ue-mcp only through the
ue-mcp/daemonexport and the daemon's HTTP API, both versioned (DAEMON_API_VERSION,EXTENSION_API_VERSION). Change them additively, or bump the version.
Development workflow
Git and commits
- Atomic commits per logical change. One fix or feature per commit with a clear message explaining the why. Don't batch unrelated changes.
- No batching "housekeeping" commits that sweep up everything at once. If you wrote five fixes, write five commits.
- Claude owns git. Stage, commit, push when ready. Don't push the user into running git commands.
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.
- today Changed 157fcaaf77fd
- 2d ago Changed · +1 lines · +500 tokens per session 63514d07959f
- 3d ago Changed · +12 lines · +579 tokens per session 614f9822a104
- 9d ago Changed · +2 lines · +86 tokens per session 5b788e1e76a1
- 10d ago Changed · +23 lines · +773 tokens per session f5b86864be77
- 15d ago Changed · +2 lines · +93 tokens per session 52a1d71af82c
- 17d ago Changed · +18 lines · +493 tokens per session 72cdc559b5ae
- 19d ago Changed 2863a89c244a
- 23d ago Changed d7293383c361
- 1mo ago First seen · 208 lines · 4,753 tokens per session scan A 40c25951f1c5
ue-mcp CLAUDE.md is an instructions file published in the GitHub repository db-lyon/ue-mcp (448 stars, last pushed yesterday), licensed MIT. It adds 7,277 tokens to every session, about $0.0291 per session on Opus 5.5. 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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