arcgis-authentication

arcgis-authentication is a skill for Claude Code from SaschaBrunnerCH/arcgis-maps-sdk-js-ai-context. It costs 38 tokens per session (1,960 once invoked), scanned A, original, MIT.

A guide to signing users in to ArcGIS services and accessing protected maps, data, and portal content. It covers API keys, OAuth 2.0, and ArcGIS's identity-management tools.

In plain words
What is it for?
Use it to add API-key access, user sign-in, OAuth login, and authenticated requests to ArcGIS applications.
Why use it?
It removes the guesswork around choosing and configuring the right kind of access control for secured ArcGIS content.

Skill for Claude Code

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

Part of the arcgis-maps-sdk-js-ai-context plugin — 35 skills shipped together

Good fit Use it to add API-key access, user sign-in, OAuth login, and authenticated requests to ArcGIS applications.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/saschabrunnerch/arcgis-maps-sdk-js-ai-context/arcgis-authentication
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 SaschaBrunnerCH/arcgis-maps-sdk-js-ai-context --skill arcgis-authentication
Clone the repo
git clone --depth 1 https://github.com/SaschaBrunnerCH/arcgis-maps-sdk-js-ai-context

Made for: Claude Code.

Or install arcgis-maps-sdk-js-ai-context, the plugin that ships this one along with the rest of its 35 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 arcgis-authentication

README.md
[![agentmods](https://agentmods.dev/badge/skills/saschabrunnerch/arcgis-maps-sdk-js-ai-context/arcgis-authentication/github.svg)](https://agentmods.dev/skills/saschabrunnerch/arcgis-maps-sdk-js-ai-context/arcgis-authentication)
Your own site
<a href="https://agentmods.dev/skills/saschabrunnerch/arcgis-maps-sdk-js-ai-context/arcgis-authentication"><img src="https://agentmods.dev/badge/skills/saschabrunnerch/arcgis-maps-sdk-js-ai-context/arcgis-authentication/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 arcgis-authentication

Your own site · 80×15
<a href="https://agentmods.dev/skills/saschabrunnerch/arcgis-maps-sdk-js-ai-context/arcgis-authentication"><img src="https://agentmods.dev/badge/skills/saschabrunnerch/arcgis-maps-sdk-js-ai-context/arcgis-authentication.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 38 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,960 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 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 $0.00038 $0.01960
Opus 5 $0.00019 $0.00980
Sonnet 5 $0.00008 $0.00392
Haiku 4.5 $0.00004 $0.00196

Measured 11d ago against content hash 3c49f84f4625, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

arcgis-authentication 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.

skills/arcgis-authentication/SKILL.md · 332 lines

How it starts

The opening of the file, as written. The whole thing — 332 lines — stays where its author put it; the contents beside it link to each section on GitHub.

ArcGIS Authentication

Use this skill for implementing authentication, OAuth, API keys, and identity management.

Import Patterns

Direct ESM Imports

import OAuthInfo from "@arcgis/core/identity/OAuthInfo.js";
import esriId from "@arcgis/core/identity/IdentityManager.js";
import Portal from "@arcgis/core/portal/Portal.js";
import esriConfig from "@arcgis/core/config.js";

Dynamic Imports (CDN)

const OAuthInfo = await $arcgis.import("@arcgis/core/identity/OAuthInfo.js");
const esriId = await $arcgis.import("@arcgis/core/identity/IdentityManager.js");
const Portal = await $arcgis.import("@arcgis/core/portal/Portal.js");

API Keys

The simplest authentication method. Set once for all SDK requests.

Configure API Key

import esriConfig from "@arcgis/core/config.js";

esriConfig.apiKey = "YOUR_API_KEY";

// Now basemaps and services will use the API key
const map = new Map({
  basemap: "arcgis/streets",
});

API Key in HTML (CDN)

<script src="https://js.arcgis.com/5.0/"></script>
<script>
  $arcgis.config.apiKey = "YOUR_API_KEY";
</script>

OAuth 2.0 Authentication

Basic OAuth Setup

import OAuthInfo from "@arcgis/core/identity/OAuthInfo.js";
import esriId from "@arcgis/core/identity/IdentityManager.js";

const oauthInfo = new OAuthInfo({
  appId: "YOUR_APP_ID",
  popup: false, // false = redirect, true = popup window
});

esriId.registerOAuthInfos([oauthInfo]);

Check Sign-In Status

async function checkSignIn() {
  try {
    await esriId.checkSignInStatus(oauthInfo.portalUrl + "/sharing");
    const portal = new Portal({ authMode: "immediate" });
    await portal.load();
    console.log("Signed in as:", portal.user.username);
    return portal;
  } catch {
    console.log("Not signed in");
    return null;
  }
}

Sign In

async function signIn() {
  try {
    const credential = await esriId.getCredential(
      oauthInfo.portalUrl + "/sharing",
    );
    return credential;
  } catch (error) {
    console.error("Sign in failed:", error);
  }
}

Read the full file on GitHub · 332 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 11d ago First seen · 332 lines · 38 tokens per session scan A 3c49f84f4625

Subscribe to this mod's changes

arcgis-authentication is a skill published in the GitHub repository SaschaBrunnerCH/arcgis-maps-sdk-js-ai-context (22 stars, last pushed 5mo ago), licensed MIT. It adds 38 tokens to every session and 1,960 once invoked, about $0.0002 per session on Opus 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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