--- title: "AI21 Labs agent readiness score: 46/100 · Agentrail" description: "The website is strongest in agent discovery, with a Wikipedia or Wikidata entity presence and discoverable developer resources, but misses checks for a public API with reachable endpoints and the MPP payment protocol." canonical: "https://www.agentrail.co/agent-readiness/ai21.com" --- Full report ## See what each check found, and how to fix it. Evidence, step-by-step fixes and your score over time, for your own site. [Get started →](https://app.agentrail.co/login?utm%5Fsource=agentrail.co&utm%5Fmedium=website&utm%5Fcampaign=agent-readiness%2Fai21.com&utm%5Fcontent=company-report) Free to start. No card. Usability 24 to fix - Public API with reachable endpointsRequiredHow to fix → - OAuth 2.0 supportRequiredHow to fix → - Scoped permissionsRecommendedHow to fix → - Agent onboarding frictionRecommendedHow to fix → Fixes unlock with the full report Where the score comes from 42 of 90 points How ai21.com scores on each of the four questions agents ask. Discovery19/20 Access15/30 Usability8/40 Paymentsnot scored yet Strongest ### Discovery ARD discovery is missing. 19/20 Most to gain ### Usability Public API with reachable endpoints, OAuth 2.0 support, and 19 more are missing. 8/40 Most to gain ### Access Agent discovery file, A2A / agent-card, and 12 more are missing. 15/30 Not scored yet ### Payments ( bonus ) 5 checks partly met. Counts when scoring opens. — Agent path ## How an agent moved through the site We asked an agent a question about ai21.comand recorded every request it made. **A**ai21.comAnsweredRan Nov 10, 2026 Question I want to start using AI21 Labs (ai21.com). Find its setup and getting-started guide. 4 Steps 29s Duration 4 Pages opened 1 Failed 1 of 2 addresses the agent typed itself didn’t load. Every link it followed loaded. 1. 1ai21.com /Named in the question _→_ **Read** 2. 2/developersTyped by the agent _→_ **Didn’t load · 404** 3. 3ai21.com /Typed by the agent _→_ **Read** 4. 4/docs/sdk.mdA link on a page it read _→_ **Read** 4/4 steps StepsHow it found itCame back as Step 4 of 4 `docs.ai21.com/docs/sdk.md` How it got here A link on a page it read Response 200 Came back as Markdown 75% Pages that loaded 25% Followed site links 67% Read as markdown How it found each page Named in the question**1** A link on a page it read**1** Typed by the agent**2** A search result**0** What it reached Home page**Step 1** Pricing**Never reached** Docs**Step 3** Its answer Answers aren’t shown publicly See what agents answer about your own site. Run agents on your site and read every answer, with every page they opened. [Get started →](https://app.agentrail.co/login?utm%5Fsource=agentrail.co&utm%5Fmedium=website&utm%5Fcampaign=agent-readiness%2Fai21.com&utm%5Fcontent=journey-answer) Free to start. No card. Every check 125checks - Passed**21** - To fix**41** - Not in the score**63** 62 checks count toward the score. The other 63 are tracked for later. Discovery19 of 201 to fix5 passed ARD discoveryRequired0 / 1 Developer resource discoverabilityRecommended3 / 3 Brand name discoverabilityRequired3 / 3 Wikipedia / Wikidata entity presenceRecommended4 / 4 robots.txt AI crawler policyRequired2 / 2 NPM/PyPI SDK packageRecommended1 / 1 \+ 9 checks not in the score AI Catalog discoveryRecommendedNot counted ARD entry validityRecommendedNot counted ARD trust manifestRecommendedNot counted Category share of voiceRecommendedNot counted Listed in MCP registriesRecommendedNot counted Agent platform configsEmergingNot counted Agent Plugins manifestEmergingNot counted Registry brandingEmergingNot counted ChatGPT app listedRecommendedNot counted Access15 of 3010 to fix4 partly13 passed Agent discovery fileRequired0 / 2 A2A / agent-cardRecommended0 / 2 MCP well-known discoveryRecommended0 / 2 Pricing info accessibleRequired0 / 3 Public API/docs linked from homepageRequired0 / 3 Trust anchor pagesRequired0 / 2 OpenAPI spec publishedRequired0 / 7 Developer portalRecommended0 / 6 API catalog (RFC 9727)Required0 / 2 Markdown content negotiation (acceptmarkdown.com)Recommended0 / 1 JSON-LD structured dataRequired2 / 4 Organization schema completenessRecommended1 / 2 Schema type breadthRecommended1 / 2 llms.txt links resolveRecommended1 / 2 Sitemap existsRequired2 / 2 Content without JavaScriptRequired3 / 3 Not blocked by bot detectionRequired2 / 2 HTTP Link headers (RFC 8288)Required1 / 1 Sitemap freshness (lastmod)Recommended1 / 1 robots.txt agent-user policyRequired2 / 2 llms.txt existsRequired1 / 1 llms.txt formattingRecommended2 / 2 JSON-LD entity linking (sameAs)Recommended2 / 2 Metadata completenessRequired2 / 2 Redirect hygieneRecommended1 / 1 Page token budgetRecommended1 / 1 Agent crawler reachabilityRecommended2 / 2 \+ 15 checks not in the score Agent Skills index conformance (v0.2.0)EmergingNot counted Listed on skills.shEmergingNot counted pricing.md existsEmergingNot counted NLWeb Schema FeedsEmergingNot counted Agent mode viewEmergingNot counted Markdown URL fallbackEmergingNot counted Modular llms.txt per product areaEmergingNot counted Agent instruction / when-to-useRequiredNot counted Skills.sh skill qualityEmergingNot counted Markdown alternate linkEmergingNot counted Markdown frontmatter metadataEmergingNot counted Code fence validityEmergingNot counted Content behind authRecommendedNot counted Markdown agent docsEmergingNot counted Bot-UA markdown servingEmergingNot counted Usability8 of 4020 to fix1 partly3 passed Public API with reachable endpointsRequired0 / 7 OAuth 2.0 supportRequired0 / 5 Scoped permissionsRecommended0 / 5 Agent onboarding frictionRecommended0 / 2 OAuth Protected Resource metadata (RFC 9728)Required0 / 2 auth.md existsRequired0 / 2 auth.md structureRecommended0 / 2 Agent auth discovery metadataRecommended0 / 3 Agent auth WWW-Authenticate hintRecommended0 / 1 agent\_auth endpoints reachableRecommended0 / 2 MCP server / manifestRequired0 / 6 Rate limit response headersRecommended0 / 2 Idempotency-Key supportRecommended0 / 3 REST typed error modelRecommended0 / 3 REST async-job patternRecommended0 / 2 Sandbox / test environmentRecommended0 / 2 REST batch / bulk endpointRecommended0 / 2 Accessible document structureRecommended0 / 3 API schema complexity analysisRecommended0 / 2 Function calling compatibilityRecommended0 / 2 Agent-friendly 404sRecommended1 / 2 JSON error responsesRequired4 / 4 CLI tool availableRecommended3 / 3 Accessible names on controlsRecommended2 / 2 \+ 38 checks not in the score MCP tool descriptionsRecommendedNot counted MCP parameter schemasRecommendedNot counted MCP server identityRecommendedNot counted MCP tool listingRecommendedNot counted MCP tool namingRecommendedNot counted MCP auth mechanismRecommendedNot counted MCP OAuth metadataRecommendedNot counted MCP PKCE S256 supportRecommendedNot counted Web Bot Auth directoryEmergingNot counted auth.md walkthrough simulationRecommendedNot counted MCP error handlingRecommendedNot counted MCP modern transportRecommendedNot counted WebMCP supportRequiredNot counted REST versioning / deprecation policyRecommendedNot counted REST pagination patternRecommendedNot counted Multi-language SDK packagesRecommendedNot counted NLWeb /ask endpointEmergingNot counted NLWeb streaming supportEmergingNot counted REST response schema coverageRecommendedNot counted MCP tool annotationsRecommendedNot counted MCP server-card.jsonRecommendedNot counted Product + docs MCP coverageRecommendedNot counted MCP resources exposedRecommendedNot counted GraphQL typed error modelRecommendedNot counted GraphQL versioning / deprecation policyRecommendedNot counted GraphQL pagination patternRecommendedNot counted GraphQL async-job patternRecommendedNot counted GraphQL schema description coverageRecommendedNot counted GraphQL batch mutationsRecommendedNot counted Native interactive controlsRecommendedNot counted Form control labelingRecommendedNot counted Accessibility-tree injection safety (bonus)RecommendedNot counted MCP Apps supportRecommendedNot counted A2UI / generative UI supportEmergingNot counted MCP Apps UI qualityRecommendedNot counted MCP App view reachableRecommendedNot counted MCP App view CSPRecommendedNot counted MCP resource qualityRecommendedNot counted PaymentsNot scored yet5 partly MPP payment protocolRequired0 / 2 x402 payment protocolRequired0 / 2 UCP - Universal Commerce ProtocolRequired0 / 3 ACP - Agentic Commerce ProtocolRequired0 / 3 AP2 - Agent Payments ProtocolRecommended0 / 3 \+ 1 check not in the score ACP delegate paymentRecommendedNot counted