# LLMs.txt Readiness Checker

> LLMs.txt Readiness Checker is a paid API for AI agents from api.agentstools.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Checks a site's /llms.txt and /llms-full.txt files for presence, size, and structural validity per llmstxt.org spec, returning a readiness score and fix recommendations.

## Facts

- Endpoint: GET https://api.agentstools.dev/aeo/llms
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/llms-txt-readiness-checker-659c9e5e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9Gt6qsCSHsxZvAGWPFVPX

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability llms-txt-readiness-checker-659c9e5e
```

Example prompt: Can you check whether example.com has a valid llms.txt file — I want to know if it's present, structurally correct (H1 title, blockquote summary, markdown link sections), and what score it gets?

## When to prefer this

Use this endpoint when you only need a focused, cheap sub-check of whether a site has a valid llms.txt / llms-full.txt, rather than running the full AEO audit. Ideal for quick LLM-readiness screening of many domains or for confirming a specific site's compliance with the llmstxt.org standard before deeper analysis.

## Known failure modes

- Target URL unreachable or DNS resolution fails — returns error with no score
- Site returns non-200 status for /llms.txt — flagged as absent
- Malformed URL input — returns validation error
- Rate limit or payment failure — 402 or 429 response
- Site has llms.txt but it is empty — low score with fix recommendations

## How this service works

Focused check of a site's /llms.txt and /llms-full.txt: presence, size and llmstxt.org structural validity (an H1 title, a blockquote summary, sections of markdown links). Returns a readiness score plus fixes. Cheap sub-check of the full AEO audit.

## Output

Returns a readiness score indicating how well the site's /llms.txt and /llms-full.txt comply with the llmstxt.org specification, including file presence status, file sizes, structural validation results (H1 title, blockquote summary, markdown link sections), and a list of specific fixes needed to improve compliance.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "url": {
       "type": "string",
       "description": "Target URL to audit (e.g. https://example.com)"
      },
      "host": {
       "type": "string",
       "description": "Alternative input: a hostname"
      },
      "domain": {
       "type": "string",
       "description": "Alternative input: a bare domain (e.g. example.com)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/llms-txt-readiness-checker-659c9e5e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.agentstools.dev](https://www.zero.xyz/host/api.agentstools.dev/llms.txt)