Use them when developing or maintaining faucet-mcp, especially its request handling, token pools, chain support, and spending caps.

They explain the faucet's purpose, design, funding pools, and spending limits so changes can respect its safety rules.

How Destiner/faucet-mcp configures Codex and OpenCode

Q: What is faucet-mcp AGENTS.md?

Repository instructions for Destiner's faucet-mcp, an MCP server that lets a coding agent request small amounts of ETH, WETH, USDC, or USDT from a configured wallet.

Reuse

Borrowing it

Nothing to install: this file belongs to Destiner/faucet-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.

Copy the file

curl -O https://raw.githubusercontent.com/Destiner/faucet-mcp/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/Destiner/faucet-mcp

Made for: Codex, OpenCode.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/destiner/faucet-mcp/agents-md/github.svg)](https://agentmods.dev/instructions/destiner/faucet-mcp/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/destiner/faucet-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/destiner/faucet-mcp/agents-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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/destiner/faucet-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/destiner/faucet-mcp/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,323 This file is loaded in full into every session.

When invoked 2,323 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original 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.

Model	Per session	Once invoked
Fable 5.1	$0.02323	$0.02323
Opus 5.5	$0.00929	$0.00929
Sonnet 5.5	$0.00465	$0.00465
Haiku 4.5	$0.00232	$0.00232

Measured 11d ago against content hash 260f9acb1c51, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

faucet-mcp AGENTS.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 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.

AGENTS.md · 139 lines

How it starts

The opening of the file, as written. The whole thing — 139 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Faucet

MCP server that lets a coding agent request small amounts of ETH/WETH/USDC/USDT (EVM) or SOL/USDC (Solana) from personal hot wallets, with safety rails so a misbehaving agent can't drain it.

Motivation

Agent work on smart wallet flows constantly needs small dev funds: top up a fresh smart account, fund a session key, seed a test on a new chain. Public faucets are unreliable and rate-limited; topping up by hand is friction. This is a self-hosted faucet over MCP that the agent can call directly, behind tight per-call and 24h budgets so "i just spent all your money" is not a possible outcome.

Threat model is agent stupidity, not malice or prompt injection — if someone can get arbitrary code execution, the funding key in .env is the cheaper attack anyway. The caps exist to protect against the agent doing dumb things while you're not watching.

Design

Two-layer caps, scoped by (chain class, token pool):

Soft caps — enforced unconditionally; first line of defense.
Hard caps (10× soft) — enforced unconditionally and not bypassable, even with a valid approval code.

When a request exceeds the soft cap but is under the hard cap, the call returns NEEDS_APPROVAL. The agent asks the user for a 6-digit TOTP code (stored in 1Password / Apple Passwords as a verification code). The agent retries with code=...; on valid code the transfer goes through. Codes are single-use within a 90s replay window.

Pools

Limits are per pool, not per token:

STABLE: USDC + USDT share one window, across EVM and Solana
ETHWETH: ETH + WETH share one window
SOL: SOL alone

So 0.5 USDC and 0.5 USDT in the same 24h count as 1.0 against the stable window.

Caps

Chain class	Pool	Soft/call	Soft 24h	Hard/call	Hard 24h
mainnet	stable	0.10	1.0	1.0	10.0
mainnet	eth	0.00002	0.0005	0.0002	0.005
mainnet	sol	0.002	0.02	0.02	0.2
testnet	stable	2	20	20	200
testnet	eth	0.001	0.01	0.01	0.1
testnet	sol	0.1	1	1	10

Read the full file on GitHub · 139 lines

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.

11d ago Changed · +12 lines · +602 tokens per session 260f9acb1c51
2mo ago First seen · 127 lines · 1,721 tokens per session scan A 7d69b7aa47ca

Subscribe to this mod's changes

faucet-mcp AGENTS.md is an instructions file published in the GitHub repository Destiner/faucet-mcp (0 stars, last pushed 5d ago), licensed MIT. It adds 2,323 tokens to every session, about $0.0093 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.

Web3 and blockchain

faucet-mcp AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
faucet-mcp AGENTS.mdDestiner/faucet-mcp	Instructions file	0	5d ago	MIT	A	2,323	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,649	GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	today	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
vscode model-prompts.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	2,022	GitHub Copilot

faucet-mcp: Instructions file for Codex