tool-developer

tool-developer is an agent for Claude Code from qfoldit/UEFN-TOOLBELT. It costs 38 tokens per session (780 once invoked), scanned A, original, no licence file.

An agent that builds tools for the Unreal Editor for Fortnite, a toolkit for creating Fortnite experiences. It checks the tool registry, writes the tool, updates counts, and checks for inconsistencies.

In plain words
What is it for?
Use it to create new UEFN Toolbelt tools and receive exact instructions for testing them.
Why use it?
It handles the surrounding registry and consistency work that can be missed when adding a tool manually.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter.

Good fit Use it to create new UEFN Toolbelt tools and receive exact instructions for testing them.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/qfoldit/uefn-toolbelt/tool-developer
Install

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.

Clone the repo
git clone --depth 1 https://github.com/qfoldit/UEFN-TOOLBELT

Made for: Claude Code.

Wrote 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.

agentmods badge for tool-developer

README.md
[![agentmods](https://agentmods.dev/badge/agents/qfoldit/uefn-toolbelt/tool-developer/github.svg)](https://agentmods.dev/agents/qfoldit/uefn-toolbelt/tool-developer)
Your own site
<a href="https://agentmods.dev/agents/qfoldit/uefn-toolbelt/tool-developer"><img src="https://agentmods.dev/badge/agents/qfoldit/uefn-toolbelt/tool-developer/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.

agentmods 80×15 button for tool-developer

Your own site · 80×15
<a href="https://agentmods.dev/agents/qfoldit/uefn-toolbelt/tool-developer"><img src="https://agentmods.dev/badge/agents/qfoldit/uefn-toolbelt/tool-developer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 38 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 780 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00038 $0.00780
Opus 5.5 $0.00015 $0.00312
Sonnet 5.5 $0.00008 $0.00156
Haiku 4.5 $0.00004 $0.00078

Measured 1mo ago against content hash 84984d2d3962, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

tool-developer 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 1mo 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.

.claude/agents/tool-developer.md · 71 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Changes

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.

  1. 1mo ago First seen · 71 lines · 38 tokens per session scan A 84984d2d3962

Subscribe to this mod's changes

tool-developer is an agent published in the GitHub repository qfoldit/UEFN-TOOLBELT (6 stars, last pushed 5d ago), with no licence file. It adds 38 tokens to every session and 780 once invoked, about $0.0002 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 2026-08-31.

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