compose-vrf

compose-vrf is a skill for Claude Code from goldsky-io/goldsky-agent. It costs 241 tokens per session (12,040 once invoked), scanned D, original, no licence file.

A deployable Goldsky Compose VRF example. A verifiable random function produces randomness that others can check was generated correctly.

In plain words
What is it for?
Listening for a RandomnessRequested event on an EVM contract, obtaining drand randomness, and writing the result back on-chain through fulfillRandomness.
Why use it?
It provides a setup for responding to on-chain randomness requests with verifiable randomness from the drand beacon.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the goldsky plugin — 22 skills, 1 agent, 2 hooks shipped together

Good fit Listening for a RandomnessRequested event on an EVM contract, obtaining drand randomness, and writing the result back on-chain through fulfillRandomness.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/goldsky-io/goldsky-agent/compose-vrf
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.

Any agent
npx skills add goldsky-io/goldsky-agent --skill compose-vrf
Clone the repo
git clone --depth 1 https://github.com/goldsky-io/goldsky-agent

Made for: Claude Code.

Or install goldsky, the plugin that ships this one along with the rest of its 22 skills, 1 agent, 2 hooks.

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 compose-vrf

README.md
[![agentmods](https://agentmods.dev/badge/skills/goldsky-io/goldsky-agent/compose-vrf/github.svg)](https://agentmods.dev/skills/goldsky-io/goldsky-agent/compose-vrf)
Your own site
<a href="https://agentmods.dev/skills/goldsky-io/goldsky-agent/compose-vrf"><img src="https://agentmods.dev/badge/skills/goldsky-io/goldsky-agent/compose-vrf/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 compose-vrf

Your own site · 80×15
<a href="https://agentmods.dev/skills/goldsky-io/goldsky-agent/compose-vrf"><img src="https://agentmods.dev/badge/skills/goldsky-io/goldsky-agent/compose-vrf.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 241 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 12,040 The whole file, excluding the scripts and references it only reads on demand.
Security scan D 3 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 $0.00241 $0.12040
Opus 5 $0.00120 $0.06020
Sonnet 5 $0.00048 $0.02408
Haiku 4.5 $0.00024 $0.01204

Measured 12d ago against content hash 8d05959654cd, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade D, and why

compose-vrf scanned grade D with 3 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.

Subtle steeringmediumPrompt injection

Instructions that bias recommendations or shape behaviour without the user noticing.

The Compose smart wallet is auto-created at runtime and gas-sponsored on Base Sepolia — never tell the user to create or fund a wallet. On the shared path there is **no fulfiller to set** (the contract is permissionless)

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

- **Edits to `compose.yaml` or source files don't take effect after redeploy.** The local `.compose/` bundle cache is stale. Run `rm -rf .compose/` and redeploy.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- **HTTP task (curl)** — the `request_randomness` task exercises the full request → event → fulfill path:
skills/compose-vrf/SKILL.md · 722 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

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. 12d ago First seen · 722 lines · 241 tokens per session scan D 8d05959654cd

Subscribe to this mod's changes

compose-vrf is a skill published in the GitHub repository goldsky-io/goldsky-agent (12 stars, last pushed 12d ago), with no licence file. It adds 241 tokens to every session and 12,040 once invoked, about $0.0012 per session on Opus 5. A static security scan graded it D with 3 findings (subtle steering, recursive force delete, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.