# arcade.dev: agentic web grade A+

Score 70 (coverage 40 + breadth 15 + conformance 15); 9 standards observed across 4 of 9 steps; checked 2026-10-25T17:44:47Z via www.arcade.dev. This grades the agent-facing files published at arcade.dev, not the organisation's products.

## Manifests

| Manifest | Path | Result | Errors | Warnings |
| --- | --- | --- | --- | --- |
| Agentic Resource Discovery | /.well-known/ard.json | valid |  | entries[0] has no description; registries index on it; entries[1] has no description; registries index on it; entries[2] has no description; registries index on it; entries[3] has no description; registries index on it; entries[4] has no description; registries index on it; no entry has representativeQueries; ARD registries use 2-5 example queries to index entries; host block missing (displayName, identifier, documentationUrl help clients name the publisher) |
| AI Catalog well-known file | /.well-known/ai-catalog.json | valid |  | entries[0] has no description; registries index on it; entries[1] has no description; registries index on it; entries[2] has no description; registries index on it; entries[3] has no description; registries index on it; entries[4] has no description; registries index on it; no entry has representativeQueries; ARD registries use 2-5 example queries to index entries; host block missing (displayName, identifier, documentationUrl help clients name the publisher) |
| MCP Server Cards (SEP-2127) | /mcp/server-card | valid |  | description is over 100 characters; no Access-Control-Allow-Origin: * (required for browser clients) |
| Agent2Agent Protocol | /.well-known/agent-card.json | absent HTTP 404 |  |  |
| llms.txt | /llms.txt | valid |  |  |
| AGENTS.md | /AGENTS.md | absent HTTP 404 |  |  |
| Agent Skills | /.well-known/agent-skills/index.json | absent HTTP 404 |  |  |
| api-catalog: A Well-Known URI and Link Relation to Help Discovery of APIs | /.well-known/api-catalog | valid |  |  |
| AI Crawler User-Agent Tokens in robots.txt | /robots.txt | valid |  | no Agentmap: line (optional convention pointing agents at /.well-known/ard.json) |
| security.txt (RFC 9116) | /.well-known/security.txt | valid |  | Canonical: missing |
| auth.md | /auth.md | absent HTTP 404 |  |  |
| Open Knowledge Format | /okf/index.md | absent HTTP 404 |  |  |

## Standards observed

- llms.txt: https://arcade.dev/llms.txt (https://agenticweb.wiki/protocols/llms-txt/)
- Content Signals Policy: https://arcade.dev/robots.txt (https://agenticweb.wiki/protocols/cloudflare-content-signals-policy/)
- Agentic Resource Discovery: https://arcade.dev/.well-known/ard.json (https://agenticweb.wiki/protocols/ard/)
- AI Catalog well-known file: https://arcade.dev/.well-known/ai-catalog.json (https://agenticweb.wiki/protocols/ai-catalog-well-known-file/)
- api-catalog: A Well-Known URI and Link Relation to Help Discovery of APIs: https://arcade.dev/.well-known/api-catalog (https://agenticweb.wiki/protocols/api-catalog-rfc9727/)
- AI Crawler User-Agent Tokens in robots.txt: https://arcade.dev/robots.txt (https://agenticweb.wiki/protocols/ai-crawler-tokens-robots/)
- Markdown for Agents: https://arcade.dev/ (https://agenticweb.wiki/protocols/cloudflare-markdown-for-agents/)
- MCP Server Cards (SEP-2127): undefined (https://agenticweb.wiki/protocols/mcp-server-cards/)
- Model Context Protocol: undefined (https://agenticweb.wiki/protocols/mcp/)

## Cheapest next steps

1. AGENTS.md: instructions for coding agents working on or with the site (https://agenticweb.wiki/protocols/agents-md/)

Published a manifest or spotted a path we missed? Submit at https://agenticweb.wiki/submit/ or email mailto:info@belgravialabs.com?subject=Manifest%20or%20correction%20for%20arcade.dev.

## Agent pre-flight & practical readiness

Preferred mode: `mcp` (fallback `openapi`). Call the MCP endpoint at https://www.arcade.dev/mcp first. Do not scrape the HTML when a tool can answer.

Fetch: `POST https://www.arcade.dev/mcp` POST a JSON-RPC tools/list, or server/discover on the 2026-07-28 revision, before reading HTML.

Practical readability: exa_parsable yes, markdown negotiation yes, render `markdown_native`, HTML quality `high`, first content at byte 0, HTML-to-llms.txt token ratio 3.384×.

AI crawler posture: `open_to_all` · Assistant access: OpenAI `allowed`, Anthropic `allowed`, Google `allowed`, Perplexity `allowed`, Exa `allowed`.

Readiness subscores: reach 20/20, readability 30/30, capabilities 29/35, conformance 15/15, total 94/100, grade A+.

## Rubric

+10 per lifecycle step with a standard observed, counting manifests that validate or that the probe rule for the standard recognises (a valid MCP server card counts for MCP; max 90); +3 per observed standard beyond the first two (max 15); conformance +15 (+10 with one manifest) minus 5 per agent-facing manifest with errors, never below 0 (security.txt is reported, not scored). Lifecycle grade: A+ >= 60, A >= 45, B >= 30, C >= 20, D >= 10. Strict 100-point composite (subscores.total_100 / subscores.grade_100): reach_and_policy (20) + readability (30) + capabilities (35) + conformance (15), where A+ >= 80, A >= 65, B >= 45, C >= 28, D >= 15.

JSON: https://agenticweb.wiki/check/arcade.dev/index.json · badge: https://agenticweb.wiki/badge/arcade.dev.svg