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Check llms txt

check_llms_txt
Read-onlyIdempotent

Requires tools:run via a registered integration or OAuth. Validate a site's llms.txt: reachability, HTML-instead-of-text, redirects to other domains, H1 title, summary, sections, links, link health, llms-full.txt and charset. Uses bounded live scraping without paid AI. Returns each check with what to fix and the file preview. Ownership management is separate.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "domain": "<domain>"
    },
    "name": "check_llms_txt"
  }
}

Input Schema

NameRequiredDescriptionDefault
domainYesA domain name such as example.com (no scheme, no path).

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "bytes": {
-        "type": "integer"
-      },
-      "checked_at": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "checks": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "detail": {
-              "type": "string"
-            },
-            "label": {
-              "type": "string"
-            },
-            "ok": {
-              "type": "boolean"
-            }
-          },
-          "required": [
-            "ok",
-            "label",
-            "detail"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "content_hash": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "domain": {
-        "type": "string"
-      },
-      "http_status": {
-        "type": [
-          "integer",
-          "null"
-        ]
-      },
-      "listed": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "authority": {
-                "type": [
-                  "integer",
-                  "null"
-                ]
-              },
-              "page": {
-                "type": "string"
-              },
-              "status": {
-                "enum": [
-                  "pending",
-                  "valid",
-                  "invalid",
-                  "unreachable"
-                ],
-                "type": "string"
-              },
-              "tier": {
-                "enum": [
-                  "featured",
-                  "listed",
-                  "unlisted",
-                  "rejected",
-                  null
-                ],
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "verified": {
-                "type": "boolean"
-              }
-            },
-            "required": [
-              "status",
-              "tier",
-              "authority",
-              "verified",
-              "page"
-            ],
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "max": {
-        "type": "integer"
-      },
-      "parsed": {
-        "additionalProperties": false,
-        "properties": {
-          "linkCount": {
-            "type": "integer"
-          },
-          "sectionCount": {
-            "type": "integer"
-          },
-          "summary": {
-            "type": [
-              "string",
-              "null"
-            ]
-          },
-          "title": {
-            "type": [
-              "string",
-              "null"
-            ]
-          }
-        },
-        "required": [
-          "title",
-          "summary",
-          "sectionCount",
-          "linkCount"
-        ],
-        "type": "object"
-      },
-      "plausible": {
-        "type": "boolean"
-      },
-      "preview": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "score": {
-        "type": "integer"
-      },
-      "url": {
-        "type": "string"
-      },
-      "verdict": {
-        "enum": [
-          "valid",
-          "unreachable",
-          "needs work"
-        ],
-        "type": "string"
-      }
-    },
-    "required": [
-      "domain",
-      "url",
-      "checks",
-      "score",
-      "max",
-      "listed",
-      "verdict",
-      "preview"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": true,
-    "properties": {
-      "detail": {
-        "type": "string"
-      },
-      "domain": {
-        "type": "string"
-      },
-      "error": {
-        "type": "string"
-      },
-      "hint": {
-        "type": "string"
-      },
-      "retry_after_seconds": {
-        "type": "integer"
-      }
-    },
-    "required": [
-      "error"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "bytes": {
+        "type": "integer"
+      },
+      "checked_at": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "checks": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "detail": {
+              "type": "string"
+            },
+            "label": {
+              "type": "string"
+            },
+            "ok": {
+              "type": "boolean"
+            }
+          },
+          "required": [
+            "ok",
+            "label",
+            "detail"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "content_hash": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "domain": {
+        "type": "string"
+      },
+      "http_status": {
+        "type": [
+          "integer",
+          "null"
+        ]
+      },
+      "listed": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "authority": {
+                "type": [
+                  "integer",
+                  "null"
+                ]
+              },
+              "page": {
+                "type": "string"
+              },
+              "status": {
+                "enum": [
+                  "pending",
+                  "valid",
+                  "invalid",
+                  "unreachable"
+                ],
+                "type": "string"
+              },
+              "tier": {
+                "enum": [
+                  "featured",
+                  "listed",
+                  "unlisted",
+                  "rejected",
+                  null
+                ],
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "verified": {
+                "type": "boolean"
+              }
+            },
+            "required": [
+              "status",
+              "tier",
+              "authority",
+              "verified",
+              "page"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "max": {
+        "type": "integer"
+      },
+      "meaning": {
+        "type": "string"
+      },
+      "parsed": {
+        "additionalProperties": false,
+        "properties": {
+          "linkCount": {
+            "type": "integer"
+          },
+          "sectionCount": {
+            "type": "integer"
+          },
+          "summary": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "title": {
+            "type": [
+              "string",
+              "null"
+            ]
+          }
+        },
+        "required": [
+          "title",
+          "summary",
+          "sectionCount",
+          "linkCount"
+        ],
+        "type": "object"
+      },
+      "plausible": {
+        "type": "boolean"
+      },
+      "preview": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "recommendations": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "code": {
+              "type": "string"
+            },
+            "fix": {
+              "type": "string"
+            },
+            "severity": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "code",
+            "severity",
+            "fix"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "score": {
+        "type": "integer"
+      },
+      "url": {
+        "type": "string"
+      },
+      "validation": {
+        "additionalProperties": false,
+        "properties": {
+          "bytes": {
+            "type": "integer"
+          },
+          "checked_at": {
+            "type": "string"
+          },
+          "checks": {
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "code": {
+                  "type": "string"
+                },
+                "detail": {
+                  "type": "string"
+                },
+                "fix": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "label": {
+                  "type": "string"
+                },
+                "ok": {
+                  "type": "boolean"
+                },
+                "optional": {
+                  "type": "boolean"
+                },
+                "required": {
+                  "type": "boolean"
+                },
+                "severity": {
+                  "enum": [
+                    "pass",
+                    "error",
+                    "warning",
+                    "info"
+                  ]
+                }
+              },
+              "required": [
+                "code",
+                "ok",
+                "label",
+                "detail",
+                "required",
+                "optional",
+                "severity",
+                "fix"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "max": {
+            "type": "integer"
+          },
+          "meaning": {
+            "type": "string"
+          },
+          "ok": {
+            "const": true
+          },
+          "parsed": {
+            "additionalProperties": false,
+            "properties": {
+              "linkCount": {
+                "type": "integer"
+              },
+              "sectionCount": {
+                "type": "integer"
+              },
+              "summary": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "title": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "title",
+              "summary",
+              "sectionCount",
+              "linkCount"
+            ],
+            "type": "object"
+          },
+          "recommendations": {
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "code": {
+                  "type": "string"
+                },
+                "fix": {
+                  "type": "string"
+                },
+                "severity": {
+                  "type": "string"
+                }
+              },
+              "required": [
+                "code",
+                "severity",
+                "fix"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "score": {
+            "type": "integer"
+          },
+          "url": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "valid": {
+            "type": "boolean"
+          },
+          "verdict": {
+            "enum": [
+              "valid",
+              "needs work"
+            ]
+          }
+        },
+        "required": [
+          "ok",
+          "valid",
+          "verdict",
+          "checked_at",
+          "url",
+          "bytes",
+          "parsed",
+          "checks",
+          "score",
+          "max",
+          "recommendations",
+          "meaning"
+        ],
+        "type": "object"
+      },
+      "verdict": {
+        "enum": [
+          "valid",
+          "unreachable",
+          "needs work"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "domain",
+      "url",
+      "checks",
+      "score",
+      "max",
+      "listed",
+      "verdict",
+      "preview"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": true,
+    "properties": {
+      "detail": {
+        "type": "string"
+      },
+      "domain": {
+        "type": "string"
+      },
+      "error": {
+        "type": "string"
+      },
+      "hint": {
+        "type": "string"
+      },
+      "retry_after_seconds": {
+        "type": "integer"
+      }
+    },
+    "required": [
+      "error"
+    ],
+    "type": "object"
+  }
+]
  2. Changed3 schema fields changed
    • addedInput schema / properties / domain / maxLength
      Added value: +253
    • addedInput schema / properties / domain / minLength
      Added value: +1
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "anyOf": [
+    {
+      "additionalProperties": false,
+      "properties": {
+        "bytes": {
+          "type": "integer"
+        },
+        "checked_at": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "checks": {
+          "items": {
+            "additionalProperties": false,
+            "properties": {
+              "detail": {
+                "type": "string"
+              },
+              "label": {
+                "type": "string"
+              },
+              "ok": {
+                "type": "boolean"
+              }
+            },
+            "required": [
+              "ok",
+              "label",
+              "detail"
+            ],
+            "type": "object"
+          },
+          "type": "array"
+        },
+        "content_hash": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "domain": {
+          "type": "string"
+        },
+        "http_status": {
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "listed": {
+          "anyOf": [
+            {
+              "additionalProperties": false,
+              "properties": {
+                "authority": {
+                  "type": [
+                    "integer",
+                    "null"
+                  ]
+                },
+                "page": {
+                  "type": "string"
+                },
+                "status": {
+                  "enum": [
+                    "pending",
+                    "valid",
+                    "invalid",
+                    "unreachable"
+                  ],
+                  "type": "string"
+                },
+                "tier": {
+                  "enum": [
+                    "featured",
+                    "listed",
+                    "unlisted",
+                    "rejected",
+                    null
+                  ],
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "verified": {
+                  "type": "boolean"
+                }
+              },
+              "required": [
+                "status",
+                "tier",
+                "authority",
+                "verified",
+                "page"
+              ],
+              "type": "object"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "max": {
+          "type": "integer"
+        },
+        "parsed": {
+          "additionalProperties": false,
+          "properties": {
+            "linkCount": {
+              "type": "integer"
+            },
+            "sectionCount": {
+              "type": "integer"
+            },
+            "summary": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "title": {
+              "type": [
+                "string",
+                "null"
+              ]
+            }
+          },
+          "required": [
+            "title",
+            "summary",
+            "sectionCount",
+            "linkCount"
+          ],
+          "type": "object"
+        },
+        "plausible": {
+          "type": "boolean"
+        },
+        "preview": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "score": {
+          "type": "integer"
+        },
+        "url": {
+          "type": "string"
+        },
+        "verdict": {
+          "enum": [
+            "valid",
+            "unreachable",
+            "needs work"
+          ],
+          "type": "string"
+        }
+      },
+      "required": [
+        "domain",
+        "url",
+        "checks",
+        "score",
+        "max",
+        "listed",
+        "verdict",
+        "preview"
+      ],
+      "type": "object"
+    },
+    {
+      "additionalProperties": true,
+      "properties": {
+        "detail": {
+          "type": "string"
+        },
+        "domain": {
+          "type": "string"
+        },
+        "error": {
+          "type": "string"
+        },
+        "hint": {
+          "type": "string"
+        },
+        "retry_after_seconds": {
+          "type": "integer"
+        }
+      },
+      "required": [
+        "error"
+      ],
+      "type": "object"
+    }
+  ],
+  "type": "object"
+}
  3. First observed

TDQS

A3.7/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnly/openWorld/idempotent/non-destructive, and the description still adds real value on top: it states the permission prerequisite (tools:run via a registered integration or OAuth), discloses that checks come from bounded live scraping with no paid AI, and says the output pairs each check with remediation advice and a file preview. What is missing is any note on rate limits, timeouts, or how long a live scrape may take.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

It is dense but disciplined, covering the check list in one compact sentence with no filler. The one structural weakness is ordering: it leads with the auth prerequisite rather than the tool's purpose, so the first thing an agent reads is not the most important thing.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists, so the description correctly avoids explaining return values while still summarizing the shape of the response (per-check findings plus a fix hint and preview). Given a one-parameter, read-only tool with full annotation coverage, the picture is nearly complete; the only real gap is the absence of sibling disambiguation against validate_llms_txt and read_llms_txt.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With a single parameter at 100% schema description coverage, the schema already explains that a bare domain (no scheme, no path) is required. The description adds nothing about the domain argument, which is acceptable here since the schema carries it fully, but it is baseline rather than additive.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a specific verb ("Validate") plus a specific resource (a site's llms.txt) and enumerates the exact checks performed: reachability, HTML-instead-of-text, redirects, H1, summary, sections, links, link health, llms-full.txt and charset. That is far beyond a tautology. It stops short of a 5 because it never distinguishes itself from close siblings such as validate_llms_txt or read_llms_txt, which an agent would need to choose between.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is implied (use this to check whether a published llms.txt is healthy and well-formed) and one exclusion is given: "Ownership management is separate," which routes away from begin_ownership_claim/verify_domain. However, no guidance is offered on when to pick this over validate_llms_txt, read_llms_txt, or audit_website, and no explicit when-not condition is stated.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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