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Recent CISA KEV additions

kev_recent

Read-onlyIdempotent

Fetch CISA Known Exploited Vulnerabilities catalog entries, newest first, with filters for date range, ransomware use, and vendor; paginate results by cursor.

Instructions

The CVEs CISA has added to its Known Exploited Vulnerabilities (KEV) catalog, newest first, from EchelonGraph's copy of that catalog, which polls CISA's feed every 5 minutes. Each kev row gives cve_id, kev_added_date (CISA's dateAdded), kev_due_date, kev_vendor, kev_product, kev_vuln_name and kev_ransomware (known ransomware-campaign use), EchelonGraph's severity, cvss_v3_score, epss_score, epss_percentile and eg_kev_tier for the CVE, and our_first_seen_kev, when EchelonGraph's poller first recorded the CVE entering the catalog (null where no such record exists). Filter by since and until (YYYY-MM-DD, inclusive, on kev_added_date), ransomware, and vendor (an exact, case-insensitive match on kev_vendor); page with limit (1 to 200, default 50) and cursor, passing back the previous page's next_cursor with the same filters. total counts the CVEs matching the filters; kev_listed_total counts every CVE EchelonGraph holds as KEV-listed, and catalog.catalog_count is CISA's own count in the catalog last fetched, so a gap between the two is entries not yet in EchelonGraph's CVE table, which no page returns. CISA's requiredAction, shortDescription and notes are not in these rows: each CVE's own record carries them, verbatim and labelled as CISA's. Its structured result's measured_at is our last successful fetch of CISA's feed (null when the API does not say), coverage counts the CISA KEV catalog (total, returned, kev_listed_total, catalog_count, limit, has_more) and freshness gives last_successful_fetch_at, catalog_version and date_released. Past 30,000 characters of JSON, the first text block holds data cut to fit, and the note says what the cut leaves out and where to read it (TEXT CUT); so is structured data (DATA CUT), unless full: true. Cut, each row keeps cve_id, kev_added_date, kev_vendor and kev_ransomware at least, or rows are left out, and next_cursor still continues after the page's last row, not the text's.

Input Schema

TableJSON Schema

Name	Required	Description
`full`	No	true: data in the structured result is the answer whole, however long. Without it, a structured result past 30,000 characters of JSON has its data cut (DATA CUT): in an order the note states, the entries of its longest lists keep only some of their fields, and then the lists only some of their entries; data_truncated is true, and truncated gives each list cut with its total, the number returned and whether its entries are thinned. Whole data is for a program; a client that sizes structured results, as Claude Code does against MAX_MCP_OUTPUT_TOKENS, can refuse an answer past its cap.
`limit`	No	page size (default 50, max 200)
`since`	No	earliest kev_added_date to include, YYYY-MM-DD (an RFC 3339 timestamp is read as the date written in it, with the time and offset dropped; anything else is refused)
`until`	No	latest kev_added_date to include, YYYY-MM-DD (an RFC 3339 timestamp is read as the date written in it, with the time and offset dropped; anything else is refused)
`cursor`	No	next_cursor from the previous page
`vendor`	No	CISA vendorProject, an exact case-insensitive match, e.g. 'Microsoft'
`ransomware`	No	true: only CVEs with known ransomware-campaign use; false: only those without

Output Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedv3.0.2Oct 17, 2026

addedInput schema / properties / full

Added value: +{
+  "description": "true: data in the structured result is the answer whole, however long. Without it, a structured result past 30,000 characters of JSON has its data cut (DATA CUT): in an order the note states, the entries of its longest lists keep only some of their fields, and then the lists only some of their entries; data_truncated is true, and truncated gives each list cut with its total, the number returned and whether its entries are thinned. Whole data is for a program; a client that sizes structured results, as Claude Code does against MAX_MCP_OUTPUT_TOKENS, can refuse an answer past its cap.",
+  "type": "boolean"
+}

changedOutput schema / oneOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "coverage": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "catalog": {
-                "const": "CISA KEV catalog",
-                "type": "string"
-              },
-              "catalog_count": {
-                "description": "CISA's own count, in the catalog last fetched.",
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "has_more": {
-                "description": "Whether next_cursor names a further page.",
-                "type": [
-                  "boolean",
-                  "null"
-                ]
-              },
-              "kev_listed_total": {
-                "description": "Every CVE EchelonGraph holds as KEV-listed.",
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "limit": {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "returned": {
-                "description": "Rows in this page.",
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "total": {
-                "description": "CVEs matching the filters.",
-                "type": [
-                  "number",
-                  "null"
-                ]
-              }
-            },
-            "required": [
-              "catalog",
-              "total",
-              "returned",
-              "kev_listed_total",
-              "catalog_count",
-              "limit",
-              "has_more"
-            ],
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "What the answer covers; null where the answer says nothing about it."
-      },
-      "data": {
-        "additionalProperties": {},
-        "properties": {
-          "catalog": {
-            "anyOf": [
-              {
-                "additionalProperties": {},
-                "properties": {
-                  "catalog_count": {
-                    "type": [
-                      "number",
-                      "null"
-                    ]
-                  },
-                  "catalog_version": {
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  },
-                  "date_released": {
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  },
-                  "feed_url": {
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  },
-                  "last_successful_fetch_at": {
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  },
-                  "source": {
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  }
-                },
-                "type": "object"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "count": {
-            "type": [
-              "number",
-              "null"
-            ]
-          },
-          "filters": {
-            "anyOf": [
-              {
-                "additionalProperties": {},
-                "properties": {},
-                "type": "object"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "generated_at": {
-            "type": [
-              "string",
-              "null"
-            ]
-          },
-          "kev": {
-            "description": "Newest kev_added_date first; rows within one date are ordered by cve_id.",
-            "items": {
-              "additionalProperties": {},
-              "properties": {
-                "cve_id": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "cvss_v3_score": {
-                  "type": [
-                    "number",
-                    "null"
-                  ]
-                },
-                "eg_kev_tier": {
-                  "type": [
-                    "number",
-                    "null"
-                  ]
-                },
-                "epss_percentile": {
-                  "type": [
-                    "number",
-                    "null"
-                  ]
-                },
-                "epss_score": {
-                  "type": [
-                    "number",
-                    "null"
-                  ]
-                },
-                "kev_added_date": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "kev_due_date": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "kev_product": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "kev_ransomware": {
-                  "type": [
-                    "boolean",
-                    "null"
-                  ]
-                },
-                "kev_vendor": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "kev_vuln_name": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "our_first_seen_kev": {
-                  "description": "When EchelonGraph's poller first recorded the CVE entering the catalog; null where no such record exists.",
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "severity": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                }
-              },
-              "type": "object"
-            },
-            "type": "array"
-          },
-          "kev_listed_total": {
-            "type": [
-              "number",
-              "null"
-            ]
-          },
-          "limit": {
-            "type": [
-              "number",
-              "null"
-            ]
-          },
-          "method": {
-            "type": [
-              "string",
-              "null"
-            ]
-          },
-          "next_cursor": {
-            "type": [
-              "string",
-              "null"
-            ]
-          },
-          "notes": {
-            "anyOf": [
-              {
-                "items": {
-                  "type": "string"
-                },
-                "type": "array"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "order": {
-            "type": [
-              "string",
-              "null"
-            ]
-          },
-          "total": {
-            "type": [
-              "number",
-              "null"
-            ]
-          }
-        },
-        "type": "object"
-      },
-      "freshness": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "catalog_version": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "date_released": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "last_successful_fetch_at": {
-                "description": "When CISA last answered our poll of its feed: a 200 we applied, or a 304 Not Modified.",
-                "type": [
-                  "string",
-                  "null"
-                ]
-              }
-            },
-            "required": [
-              "last_successful_fetch_at",
-              "catalog_version",
-              "date_released"
-            ],
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "The producing radar's last completed check (last_run_at), where the API serves one."
-      },
-      "measured_at": {
-        "anyOf": [
-          {
-            "description": "An RFC 3339 instant.",
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "When the underlying observation was made, as the API states it; null when the answer does not say or holds no observation."
-      },
-      "method": {
-        "description": "How the numbers were produced.",
-        "type": "string"
-      },
-      "notes": {
-        "description": "Caveats, one sentence each.",
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "state": {
-        "description": "measured: a measurement of what was asked; an exposure count is measured only with measured_at and method. not_assessed: the answer holds no dated measurement of what was asked, so no count in it is presented as one; it can still relay a count, as what the source holds on record, undated, and its notes (and exposure_state, where the result carries it) say what each count is.",
-        "enum": [
-          "measured",
-          "not_assessed"
-        ],
-        "type": "string"
-      }
-    },
-    "required": [
-      "state",
-      "measured_at",
-      "method",
-      "coverage",
-      "freshness",
-      "notes",
-      "data"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "coverage": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "catalog": {
-                "const": "CISA KEV catalog",
-                "type": "string"
-              },
-              "catalog_count": {
-                "description": "CISA's own count, in the catalog last fetched.",
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "has_more": {
-                "description": "Whether next_cursor names a further page.",
-                "type": [
-                  "boolean",
-                  "null"
-                ]
-              },
-              "kev_listed_total": {
-                "description": "Every CVE EchelonGraph holds as KEV-listed.",
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "limit": {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "returned": {
-                "description": "Rows in this page.",
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "total": {
-                "description": "CVEs matching the filters.",
-                "type": [
-                  "number",
-                  "null"
-                ]
-              }
-            },
-            "required": [
-              "catalog",
-              "total",
-              "returned",
-              "kev_listed_total",
-              "catalog_count",
-              "limit",
-              "has_more"
-            ],
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "error": {
-        "additionalProperties": false,
-        "properties": {
-          "kind": {
-            "description": "What failed: the request (network, timeout), the answer (http, not_json, not_object, unexpected_shape), the input, or this server.",
-            "enum": [
-              "network",
-              "timeout",
-              "http",
-              "not_json",
-              "not_object",
-              "invalid_input",
-              "internal",
-              "unexpected_shape",
-              "radars"
-            ],
-            "type": "string"
-          },
-          "message": {
-            "description": "The cause: the API's own message, or what went wrong.",
-            "type": "string"
-          },
-          "path": {
-            "description": "The API path requested, when a request was made.",
-            "type": [
-              "string",
-              "null"
-            ]
-          },
-          "status": {
-            "anyOf": [
-              {
-                "maximum": 9007199254740991,
-                "minimum": -9007199254740991,
-                "type": "integer"
-              },
-              {
-                "type": "null"
-              }
-            ],
-            "description": "The HTTP status, when the API answered one."
-          }
-        },
-        "required": [
-          "kind",
-          "path",
-          "status",
-          "message"
-        ],
-        "type": "object"
-      },
-      "freshness": {
-        "type": "null"
-      },
-      "measured_at": {
-        "type": "null"
-      },
-      "method": {
-        "type": "null"
-      },
-      "notes": {
-        "description": "Caveats, one sentence each.",
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "state": {
-        "description": "failed: the lookup did not complete. invalid_input: the input was refused, so nothing was looked up. Neither is a finding.",
-        "enum": [
-          "failed",
-          "invalid_input"
-        ],
-        "type": "string"
-      }
-    },
-    "required": [
-      "state",
-      "measured_at",
-      "method",
-      "coverage",
-      "freshness",
-      "notes",
-      "error"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": {},
+    "properties": {
+      "coverage": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "catalog": {
+                "const": "CISA KEV catalog",
+                "type": "string"
+              },
+              "catalog_count": {
+                "description": "CISA's own count, in the catalog last fetched.",
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "has_more": {
+                "description": "Whether next_cursor names a further page.",
+                "type": [
+                  "boolean",
+                  "null"
+                ]
+              },
+              "kev_listed_total": {
+                "description": "Every CVE EchelonGraph holds as KEV-listed.",
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "limit": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "returned": {
+                "description": "Rows in this page.",
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "total": {
+                "description": "CVEs matching the filters.",
+                "type": [
+                  "number",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "catalog",
+              "total",
+              "returned",
+              "kev_listed_total",
+              "catalog_count",
+              "limit",
+              "has_more"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "What the answer covers; null where the answer says nothing about it."
+      },
+      "data": {
+        "additionalProperties": {},
+        "properties": {
+          "catalog": {
+            "anyOf": [
+              {
+                "additionalProperties": {},
+                "properties": {
+                  "catalog_count": {
+                    "type": [
+                      "number",
+                      "null"
+                    ]
+                  },
+                  "catalog_version": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "date_released": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "feed_url": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "last_successful_fetch_at": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "source": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  }
+                },
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "count": {
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "filters": {
+            "anyOf": [
+              {
+                "additionalProperties": {},
+                "properties": {},
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "generated_at": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "kev": {
+            "description": "Newest kev_added_date first; rows within one date are ordered by cve_id.",
+            "items": {
+              "additionalProperties": {},
+              "properties": {
+                "cve_id": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "cvss_v3_score": {
+                  "type": [
+                    "number",
+                    "null"
+                  ]
+                },
+                "eg_kev_tier": {
+                  "type": [
+                    "number",
+                    "null"
+                  ]
+                },
+                "epss_percentile": {
+                  "type": [
+                    "number",
+                    "null"
+                  ]
+                },
+                "epss_score": {
+                  "type": [
+                    "number",
+                    "null"
+                  ]
+                },
+                "kev_added_date": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "kev_due_date": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "kev_product": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "kev_ransomware": {
+                  "type": [
+                    "boolean",
+                    "null"
+                  ]
+                },
+                "kev_vendor": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "kev_vuln_name": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "our_first_seen_kev": {
+                  "description": "When EchelonGraph's poller first recorded the CVE entering the catalog; null where no such record exists.",
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "severity": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                }
+              },
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "kev_listed_total": {
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "limit": {
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "method": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "next_cursor": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "notes": {
+            "anyOf": [
+              {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "order": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "total": {
+            "type": [
+              "number",
+              "null"
+            ]
+          }
+        },
+        "type": "object"
+      },
+      "data_truncated": {
+        "description": "false: data is the answer whole. true: the structured result would pass 30,000 characters of JSON with data whole, so data is cut (DATA CUT): the entries of some of its lists keep only some of their fields, or the lists only some of their entries, truncated gives each, and no string is shortened. The same call with full: true returns data whole.",
+        "type": "boolean"
+      },
+      "freshness": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "catalog_version": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "date_released": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "last_successful_fetch_at": {
+                "description": "When CISA last answered our poll of its feed: a 200 we applied, or a 304 Not Modified.",
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "last_successful_fetch_at",
+              "catalog_version",
+              "date_released"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "The producing radar's last completed check (last_run_at), where the API serves one."
+      },
+      "measured_at": {
+        "anyOf": [
+          {
+            "description": "An RFC 3339 instant.",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "When the underlying observation was made, as the API states it; null when the answer does not say or holds no observation."
+      },
+      "method": {
+        "description": "How the numbers were produced.",
+        "type": "string"
+      },
+      "notes": {
+        "description": "Caveats, one sentence each.",
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "state": {
+        "description": "measured: a measurement of what was asked; an exposure count is measured only with measured_at and method. not_assessed: the answer holds no dated measurement of what was asked, so no count in it is presented as one; it can still relay a count, as what the source holds on record, undated, and its notes (and exposure_state, where the result carries it) say what each count is.",
+        "enum": [
+          "measured",
+          "not_assessed"
+        ],
+        "type": "string"
+      },
+      "truncated": {
+        "additionalProperties": {
+          "additionalProperties": false,
+          "properties": {
+            "returned": {
+              "maximum": 9007199254740991,
+              "minimum": 0,
+              "type": "integer"
+            },
+            "thinned": {
+              "const": true,
+              "type": "boolean"
+            },
+            "total": {
+              "maximum": 9007199254740991,
+              "minimum": 0,
+              "type": "integer"
+            }
+          },
+          "required": [
+            "total",
+            "returned"
+          ],
+          "type": "object"
+        },
+        "description": "Present when data_truncated is true: each list of data that was cut, by its path in data (a dot between the names of an object and a list inside it), with total, its entries in the answer, returned, the entries data holds, and thinned, true when each of them keeps only some of its fields.",
+        "propertyNames": {
+          "type": "string"
+        },
+        "type": "object"
+      }
+    },
+    "required": [
+      "state",
+      "measured_at",
+      "method",
+      "coverage",
+      "freshness",
+      "notes",
+      "data_truncated",
+      "data"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "coverage": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "catalog": {
+                "const": "CISA KEV catalog",
+                "type": "string"
+              },
+              "catalog_count": {
+                "description": "CISA's own count, in the catalog last fetched.",
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "has_more": {
+                "description": "Whether next_cursor names a further page.",
+                "type": [
+                  "boolean",
+                  "null"
+                ]
+              },
+              "kev_listed_total": {
+                "description": "Every CVE EchelonGraph holds as KEV-listed.",
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "limit": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "returned": {
+                "description": "Rows in this page.",
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "total": {
+                "description": "CVEs matching the filters.",
+                "type": [
+                  "number",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "catalog",
+              "total",
+              "returned",
+              "kev_listed_total",
+              "catalog_count",
+              "limit",
+              "has_more"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "error": {
+        "additionalProperties": false,
+        "properties": {
+          "kind": {
+            "description": "What failed: the request (network, timeout), the answer (http, not_json, not_object, unexpected_shape), the input, or this server.",
+            "enum": [
+              "network",
+              "timeout",
+              "http",
+              "not_json",
+              "not_object",
+              "invalid_input",
+              "internal",
+              "unexpected_shape",
+              "radars"
+            ],
+            "type": "string"
+          },
+          "message": {
+            "description": "The cause: the API's own message, or what went wrong.",
+            "type": "string"
+          },
+          "path": {
+            "description": "The API path requested, when a request was made.",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "status": {
+            "anyOf": [
+              {
+                "maximum": 9007199254740991,
+                "minimum": -9007199254740991,
+                "type": "integer"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "description": "The HTTP status, when the API answered one."
+          }
+        },
+        "required": [
+          "kind",
+          "path",
+          "status",
+          "message"
+        ],
+        "type": "object"
+      },
+      "freshness": {
+        "type": "null"
+      },
+      "measured_at": {
+        "type": "null"
+      },
+      "method": {
+        "type": "null"
+      },
+      "notes": {
+        "description": "Caveats, one sentence each.",
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "state": {
+        "description": "failed: the lookup did not complete. invalid_input: the input was refused, so nothing was looked up. Neither is a finding.",
+        "enum": [
+          "failed",
+          "invalid_input"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "state",
+      "measured_at",
+      "method",
+      "coverage",
+      "freshness",
+      "notes",
+      "error"
+    ],
+    "type": "object"
+  }
+]

Changed3 schema fields changedv2.7.0Oct 6, 2026

changedInput schema / properties / since / description

Previous value: -"earliest kev_added_date to include, YYYY-MM-DD (an RFC 3339 timestamp is read as the date written in it)"New value: +"earliest kev_added_date to include, YYYY-MM-DD (an RFC 3339 timestamp is read as the date written in it, with the time and offset dropped; anything else is refused)"

changedInput schema / properties / until / description

Previous value: -"latest kev_added_date to include, YYYY-MM-DD (an RFC 3339 timestamp is read as the date written in it)"New value: +"latest kev_added_date to include, YYYY-MM-DD (an RFC 3339 timestamp is read as the date written in it, with the time and offset dropped; anything else is refused)"

changedOutput schema / oneOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "coverage": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "catalog": {
-                "const": "CISA KEV catalog",
-                "type": "string"
-              },
-              "catalog_count": {
-                "description": "CISA's own count, in the catalog last fetched.",
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "has_more": {
-                "description": "Whether next_cursor names a further page.",
-                "type": [
-                  "boolean",
-                  "null"
-                ]
-              },
-              "kev_listed_total": {
-                "description": "Every CVE EchelonGraph holds as KEV-listed.",
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "limit": {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "returned": {
-                "description": "Rows in this page.",
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "total": {
-                "description": "CVEs matching the filters.",
-                "type": [
-                  "number",
-                  "null"
-                ]
-              }
-            },
-            "required": [
-              "catalog",
-              "total",
-              "returned",
-              "kev_listed_total",
-              "catalog_count",
-              "limit",
-              "has_more"
-            ],
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "What the answer covers; null where the answer says nothing about it."
-      },
-      "data": {
-        "additionalProperties": {},
-        "properties": {
-          "catalog": {
-            "anyOf": [
-              {
-                "additionalProperties": {},
-                "properties": {
-                  "catalog_count": {
-                    "type": [
-                      "number",
-                      "null"
-                    ]
-                  },
-                  "catalog_version": {
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  },
-                  "date_released": {
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  },
-                  "feed_url": {
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  },
-                  "last_successful_fetch_at": {
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  },
-                  "source": {
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  }
-                },
-                "type": "object"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "count": {
-            "type": [
-              "number",
-              "null"
-            ]
-          },
-          "filters": {
-            "anyOf": [
-              {
-                "additionalProperties": {},
-                "properties": {},
-                "type": "object"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "generated_at": {
-            "type": [
-              "string",
-              "null"
-            ]
-          },
-          "kev": {
-            "items": {
-              "additionalProperties": {},
-              "properties": {
-                "cve_id": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "cvss_v3_score": {
-                  "type": [
-                    "number",
-                    "null"
-                  ]
-                },
-                "eg_kev_tier": {
-                  "type": [
-                    "number",
-                    "null"
-                  ]
-                },
-                "epss_percentile": {
-                  "type": [
-                    "number",
-                    "null"
-                  ]
-                },
-                "epss_score": {
-                  "type": [
-                    "number",
-                    "null"
-                  ]
-                },
-                "kev_added_date": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "kev_due_date": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "kev_product": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "kev_ransomware": {
-                  "type": [
-                    "boolean",
-                    "null"
-                  ]
-                },
-                "kev_vendor": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "kev_vuln_name": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "our_first_seen_kev": {
-                  "description": "When EchelonGraph's poller first recorded the CVE entering the catalog; null where no such record exists.",
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "severity": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                }
-              },
-              "type": "object"
-            },
-            "type": "array"
-          },
-          "kev_listed_total": {
-            "type": [
-              "number",
-              "null"
-            ]
-          },
-          "limit": {
-            "type": [
-              "number",
-              "null"
-            ]
-          },
-          "method": {
-            "type": [
-              "string",
-              "null"
-            ]
-          },
-          "next_cursor": {
-            "type": [
-              "string",
-              "null"
-            ]
-          },
-          "notes": {
-            "anyOf": [
-              {
-                "items": {
-                  "type": "string"
-                },
-                "type": "array"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "order": {
-            "type": [
-              "string",
-              "null"
-            ]
-          },
-          "total": {
-            "type": [
-              "number",
-              "null"
-            ]
-          }
-        },
-        "type": "object"
-      },
-      "freshness": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "catalog_version": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "date_released": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "last_successful_fetch_at": {
-                "description": "When CISA last answered our poll of its feed: a 200 we applied, or a 304 Not Modified.",
-                "type": [
-                  "string",
-                  "null"
-                ]
-              }
-            },
-            "required": [
-              "last_successful_fetch_at",
-              "catalog_version",
-              "date_released"
-            ],
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "The producing radar's last completed check (last_run_at), where the API serves one."
-      },
-      "measured_at": {
-        "anyOf": [
-          {
-            "description": "An RFC 3339 instant.",
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "When the underlying observation was made, as the API states it; null when the answer does not say or holds no observation."
-      },
-      "method": {
-        "description": "How the numbers were produced.",
-        "type": "string"
-      },
-      "notes": {
-        "description": "Caveats, one sentence each.",
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "state": {
-        "description": "measured: a measurement of what was asked; an exposure count is measured only with measured_at and method. not_assessed: the answer holds no dated measurement of what was asked, so no count in it is presented as one; it can still relay a count, as what the source holds on record, undated, and its notes (and exposure_state, where the result carries it) say what each count is.",
-        "enum": [
-          "measured",
-          "not_assessed"
-        ],
-        "type": "string"
-      }
-    },
-    "required": [
-      "state",
-      "measured_at",
-      "method",
-      "coverage",
-      "freshness",
-      "notes",
-      "data"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "coverage": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "catalog": {
-                "const": "CISA KEV catalog",
-                "type": "string"
-              },
-              "catalog_count": {
-                "description": "CISA's own count, in the catalog last fetched.",
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "has_more": {
-                "description": "Whether next_cursor names a further page.",
-                "type": [
-                  "boolean",
-                  "null"
-                ]
-              },
-              "kev_listed_total": {
-                "description": "Every CVE EchelonGraph holds as KEV-listed.",
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "limit": {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "returned": {
-                "description": "Rows in this page.",
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "total": {
-                "description": "CVEs matching the filters.",
-                "type": [
-                  "number",
-                  "null"
-                ]
-              }
-            },
-            "required": [
-              "catalog",
-              "total",
-              "returned",
-              "kev_listed_total",
-              "catalog_count",
-              "limit",
-              "has_more"
-            ],
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "error": {
-        "additionalProperties": false,
-        "properties": {
-          "kind": {
-            "description": "What failed: the request (network, timeout), the answer (http, not_json, not_object, unexpected_shape), the input, or this server.",
-            "enum": [
-              "network",
-              "timeout",
-              "http",
-              "not_json",
-              "not_object",
-              "invalid_input",
-              "internal",
-              "unexpected_shape",
-              "radars"
-            ],
-            "type": "string"
-          },
-          "message": {
-            "description": "The cause: the API's own message, or what went wrong.",
-            "type": "string"
-          },
-          "path": {
-            "description": "The API path requested, when a request was made.",
-            "type": [
-              "string",
-              "null"
-            ]
-          },
-          "status": {
-            "anyOf": [
-              {
-                "maximum": 9007199254740991,
-                "minimum": -9007199254740991,
-                "type": "integer"
-              },
-              {
-                "type": "null"
-              }
-            ],
-            "description": "The HTTP status, when the API answered one."
-          }
-        },
-        "required": [
-          "kind",
-          "path",
-          "status",
-          "message"
-        ],
-        "type": "object"
-      },
-      "freshness": {
-        "type": "null"
-      },
-      "measured_at": {
-        "type": "null"
-      },
-      "method": {
-        "type": "null"
-      },
-      "notes": {
-        "description": "Caveats, one sentence each.",
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "state": {
-        "description": "failed: the lookup did not complete. invalid_input: the input was refused, so nothing was looked up. Neither is a finding.",
-        "enum": [
-          "failed",
-          "invalid_input"
-        ],
-        "type": "string"
-      }
-    },
-    "required": [
-      "state",
-      "measured_at",
-      "method",
-      "coverage",
-      "freshness",
-      "notes",
-      "error"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "coverage": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "catalog": {
+                "const": "CISA KEV catalog",
+                "type": "string"
+              },
+              "catalog_count": {
+                "description": "CISA's own count, in the catalog last fetched.",
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "has_more": {
+                "description": "Whether next_cursor names a further page.",
+                "type": [
+                  "boolean",
+                  "null"
+                ]
+              },
+              "kev_listed_total": {
+                "description": "Every CVE EchelonGraph holds as KEV-listed.",
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "limit": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "returned": {
+                "description": "Rows in this page.",
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "total": {
+                "description": "CVEs matching the filters.",
+                "type": [
+                  "number",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "catalog",
+              "total",
+              "returned",
+              "kev_listed_total",
+              "catalog_count",
+              "limit",
+              "has_more"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "What the answer covers; null where the answer says nothing about it."
+      },
+      "data": {
+        "additionalProperties": {},
+        "properties": {
+          "catalog": {
+            "anyOf": [
+              {
+                "additionalProperties": {},
+                "properties": {
+                  "catalog_count": {
+                    "type": [
+                      "number",
+                      "null"
+                    ]
+                  },
+                  "catalog_version": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "date_released": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "feed_url": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "last_successful_fetch_at": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "source": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  }
+                },
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "count": {
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "filters": {
+            "anyOf": [
+              {
+                "additionalProperties": {},
+                "properties": {},
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "generated_at": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "kev": {
+            "description": "Newest kev_added_date first; rows within one date are ordered by cve_id.",
+            "items": {
+              "additionalProperties": {},
+              "properties": {
+                "cve_id": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "cvss_v3_score": {
+                  "type": [
+                    "number",
+                    "null"
+                  ]
+                },
+                "eg_kev_tier": {
+                  "type": [
+                    "number",
+                    "null"
+                  ]
+                },
+                "epss_percentile": {
+                  "type": [
+                    "number",
+                    "null"
+                  ]
+                },
+                "epss_score": {
+                  "type": [
+                    "number",
+                    "null"
+                  ]
+                },
+                "kev_added_date": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "kev_due_date": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "kev_product": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "kev_ransomware": {
+                  "type": [
+                    "boolean",
+                    "null"
+                  ]
+                },
+                "kev_vendor": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "kev_vuln_name": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "our_first_seen_kev": {
+                  "description": "When EchelonGraph's poller first recorded the CVE entering the catalog; null where no such record exists.",
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "severity": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                }
+              },
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "kev_listed_total": {
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "limit": {
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "method": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "next_cursor": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "notes": {
+            "anyOf": [
+              {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "order": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "total": {
+            "type": [
+              "number",
+              "null"
+            ]
+          }
+        },
+        "type": "object"
+      },
+      "freshness": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "catalog_version": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "date_released": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "last_successful_fetch_at": {
+                "description": "When CISA last answered our poll of its feed: a 200 we applied, or a 304 Not Modified.",
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "last_successful_fetch_at",
+              "catalog_version",
+              "date_released"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "The producing radar's last completed check (last_run_at), where the API serves one."
+      },
+      "measured_at": {
+        "anyOf": [
+          {
+            "description": "An RFC 3339 instant.",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "When the underlying observation was made, as the API states it; null when the answer does not say or holds no observation."
+      },
+      "method": {
+        "description": "How the numbers were produced.",
+        "type": "string"
+      },
+      "notes": {
+        "description": "Caveats, one sentence each.",
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "state": {
+        "description": "measured: a measurement of what was asked; an exposure count is measured only with measured_at and method. not_assessed: the answer holds no dated measurement of what was asked, so no count in it is presented as one; it can still relay a count, as what the source holds on record, undated, and its notes (and exposure_state, where the result carries it) say what each count is.",
+        "enum": [
+          "measured",
+          "not_assessed"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "state",
+      "measured_at",
+      "method",
+      "coverage",
+      "freshness",
+      "notes",
+      "data"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "coverage": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "catalog": {
+                "const": "CISA KEV catalog",
+                "type": "string"
+              },
+              "catalog_count": {
+                "description": "CISA's own count, in the catalog last fetched.",
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "has_more": {
+                "description": "Whether next_cursor names a further page.",
+                "type": [
+                  "boolean",
+                  "null"
+                ]
+              },
+              "kev_listed_total": {
+                "description": "Every CVE EchelonGraph holds as KEV-listed.",
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "limit": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "returned": {
+                "description": "Rows in this page.",
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "total": {
+                "description": "CVEs matching the filters.",
+                "type": [
+                  "number",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "catalog",
+              "total",
+              "returned",
+              "kev_listed_total",
+              "catalog_count",
+              "limit",
+              "has_more"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "error": {
+        "additionalProperties": false,
+        "properties": {
+          "kind": {
+            "description": "What failed: the request (network, timeout), the answer (http, not_json, not_object, unexpected_shape), the input, or this server.",
+            "enum": [
+              "network",
+              "timeout",
+              "http",
+              "not_json",
+              "not_object",
+              "invalid_input",
+              "internal",
+              "unexpected_shape",
+              "radars"
+            ],
+            "type": "string"
+          },
+          "message": {
+            "description": "The cause: the API's own message, or what went wrong.",
+            "type": "string"
+          },
+          "path": {
+            "description": "The API path requested, when a request was made.",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "status": {
+            "anyOf": [
+              {
+                "maximum": 9007199254740991,
+                "minimum": -9007199254740991,
+                "type": "integer"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "description": "The HTTP status, when the API answered one."
+          }
+        },
+        "required": [
+          "kind",
+          "path",
+          "status",
+          "message"
+        ],
+        "type": "object"
+      },
+      "freshness": {
+        "type": "null"
+      },
+      "measured_at": {
+        "type": "null"
+      },
+      "method": {
+        "type": "null"
+      },
+      "notes": {
+        "description": "Caveats, one sentence each.",
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "state": {
+        "description": "failed: the lookup did not complete. invalid_input: the input was refused, so nothing was looked up. Neither is a finding.",
+        "enum": [
+          "failed",
+          "invalid_input"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "state",
+      "measured_at",
+      "method",
+      "coverage",
+      "freshness",
+      "notes",
+      "error"
+    ],
+    "type": "object"
+  }
+]

Addedv2.6.3Oct 4, 2026

TDQS

A4.5/5.0

Behavior5/5

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

Annotations already cover the safety profile (readOnly, idempotent, openWorld, non-destructive), but the description adds substantial behavior the annotations cannot: the 5-minute poll cadence, the distinction between total, kev_listed_total and catalog.catalog_count (and why a gap means entries not yet in the CVE table, 'which no page returns'), and the 30,000-character truncation regime including that next_cursor continues after the page's last row rather than the text's.

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

Conciseness3/5

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

It is front-loaded with the resource and ordering, but it is a single very long block, and a sizable portion enumerates every returned field (cve_id, kev_added_date, kev_vendor, epss_score, eg_kev_tier, our_first_seen_kev, etc.) that the output schema already carries. The truncation and count-gap material earns its place; the field roll-call largely does not.

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

Completeness5/5

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

For a 7-parameter, read-only, paginated catalog feed with a rich output schema and strong annotations, the description supplies everything an agent needs: data provenance and freshness, filter semantics, pagination contract, the meaning of the two competing totals, and explicit truncation behavior with a full:true escape hatch. Nothing material is missing.

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

Parameters4/5

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

Schema coverage is 100%, so the baseline is 3, but the description adds real meaning: since/until are inclusive and applied to kev_added_date, vendor is an exact case-insensitive match on kev_vendor, and cursor must be passed back with the same filters. These add constraints beyond the schema's field-level text.

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

Purpose5/5

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

The description names a specific resource and ordering ('The CVEs CISA has added to its Known Exploited Vulnerabilities (KEV) catalog, newest first') and identifies the data source and its freshness ('EchelonGraph's copy of that catalog, which polls CISA's feed every 5 minutes'). It also carves out its boundary explicitly, stating that requiredAction/shortDescription/notes are not in these rows and live on each CVE's own record, which functionally distinguishes it from the per-CVE sibling tools.

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

Usage Guidelines4/5

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

The description gives concrete operating context: filter with since/until (inclusive, on kev_added_date), ransomware, and vendor (exact case-insensitive), and page by passing the previous page's next_cursor back 'with the same filters'. It also implicitly routes the agent elsewhere for CISA's requiredAction/shortDescription/notes. It stops short of naming an alternative sibling tool or stating explicit when-not-to-use conditions.

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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