revx-auth

revx-auth is a skill for Claude Code from revolut-engineering/revolut-x-api. It costs 58 tokens per session (941 once invoked), scanned B, original, MIT.

A setup guide for the Revolut X command-line tool, which lets you work with Revolut X from a terminal. It covers installing the tool, creating API keys, and protecting write operations with a keypair and passphrase.

In plain words
What is it for?
Use it to install and configure the CLI, generate a keypair, set an API key and passphrase, and resolve authentication setup errors.
Why use it?
It removes the guesswork from first-time authentication and gives steps for diagnosing common setup errors, such as incorrect private-key permissions.

Skill for Claude Code

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

Part of the revolut-x plugin — 7 skills shipped together

Good fit Use it to install and configure the CLI, generate a keypair, set an API key and passphrase, and resolve authentication setup errors.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/revolut-engineering/revolut-x-api/revx-auth
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 revolut-engineering/revolut-x-api --skill revx-auth
Clone the repo
git clone --depth 1 https://github.com/revolut-engineering/revolut-x-api

Made for: Claude Code.

Or install revolut-x, the plugin that ships this one along with the rest of its 7 skills.

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 revx-auth

README.md
[![agentmods](https://agentmods.dev/badge/skills/revolut-engineering/revolut-x-api/revx-auth/github.svg)](https://agentmods.dev/skills/revolut-engineering/revolut-x-api/revx-auth)
Your own site
<a href="https://agentmods.dev/skills/revolut-engineering/revolut-x-api/revx-auth"><img src="https://agentmods.dev/badge/skills/revolut-engineering/revolut-x-api/revx-auth/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 revx-auth

Your own site · 80×15
<a href="https://agentmods.dev/skills/revolut-engineering/revolut-x-api/revx-auth"><img src="https://agentmods.dev/badge/skills/revolut-engineering/revolut-x-api/revx-auth.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 58 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 941 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Privilege Escalation · line 13
    Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.
    Fix: Avoid sudo/root unless strictly required. Prefer least-privilege patterns. If elevation is needed, document the justification and scope.
How audits are shown
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00058 $0.00941
Opus 5 $0.00029 $0.00470
Sonnet 5 $0.00012 $0.00188
Haiku 4.5 $0.00006 $0.00094

Measured 10d ago against content hash 887cf95299cb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade B, and why

revx-auth scanned grade B with 1 finding 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 10d 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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

> **Auto-resolve target.** When invoked from another `revx-*` skill due to an auth error, do not bounce the user back to manual setup. Diagnose the failure against the [Error Reference](#error-reference) below, run the f
plugins/revolut-x/skills/revx-auth/SKILL.md · 112 lines

How it starts

The opening of the file, as written. The whole thing — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Auth & Account Setup (revx configure)

Install the CLI, generate API keys, and configure write-operation security.

Auto-resolve target. When invoked from another revx-* skill due to an auth error, do not bounce the user back to manual setup. Diagnose the failure against the Error Reference below, run the fix yourself (e.g. chmod 600 ~/.config/revolut-x/private.pem, revx configure generate-keypair, revx configure set --api-key <key>), then return to the calling skill and retry the original command. Only ask the user for inputs that only they can provide: the 64-character API key string, confirmation that they have registered the public key in their Revolut X profile, the keypair passphrase, or approval to overwrite an existing keypair.

Prerequisites

  • Node.js >= 20 (check with node -v)
  • npm (comes with Node.js)

Install

npm install -g @revolut/revolut-x-cli && npm link @revolut/revolut-x-cli

After install, revx is available as a global command:

revx --version                # Should print the version

Getting Started

Step 1: Configure Authentication

revx configure                 # Interactive setup wizard

This will:

  1. Generate an Ed25519 keypair (private + public key)
  2. Display your public key — copy it
  3. Prompt you to register the public key at exchange.revolut.com -> Profile -> API Keys
  4. Create a new API key — tick the "Allow usage via Revolut X MCP and CLI" checkbox
  5. Prompt for the 64-character API key you receive after registration

Or do it step-by-step:

revx configure generate-keypair          # Creates Ed25519 keypair
# Register public key at exchange.revolut.com -> Profile -> API Keys
# Create API key — tick "Allow usage via Revolut X MCP and CLI"
revx configure set --api-key <64-char-key>

Step 2: Verify Configuration

revx configure get             # Show config status (keys redacted)
revx configure path            # Print config directory path

Read the full file on GitHub · 112 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.

  1. 10d ago First seen · 112 lines · 58 tokens per session scan B 887cf95299cb

Subscribe to this mod's changes

revx-auth is a skill published in the GitHub repository revolut-engineering/revolut-x-api (62 stars, last pushed 5d ago), licensed MIT. It adds 58 tokens to every session and 941 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Related

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