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cross_db_query

Read-onlyIdempotent

⚠️ SQL MUST BE VALID IN EVERY DIALECT YOU TARGET — stick to ANSI-ish SELECT syntax when mixing pg/mysql/mssql. SELECT TOP 10 (mssql) or LIMIT (others) will fail on the wrong side. Run the same query across 2-4 connections in parallel; returns per-connection rows + errors for diffing. Canonical use cases: regional compare (['mssql-reporting-us', 'mssql-reporting-eu']), cross-dialect sync check (['prod-postgres-fleet', 'prod-mysql-app']), 3-env drift, 4-region compare. Resolve every connection name via list_connections first; tool fails per-connection on unknown names. Cap: 4 connections per call on every plan; to compare more, split into sequential calls of ≤4 and combine. [ARCHITECT tier]

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
sqlYesSQL query to run on each connection. Must be valid in every dialect targeted — prefer ANSI SELECT syntax when mixing dialects.
connectionsYesArray of 2-4 connection NAMES (not IDs) from list_connections output. Examples: ['mssql-reporting-us', 'mssql-reporting-eu'] for regional compare, ['prod-postgres-fleet', 'prod-mysql-app'] for cross-dialect sync check.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
dataNo
metaNo
displayNo
summaryNo
insightsNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed4 schema fields changed
    • changedOutput schema / properties / data / anyOf
      Previous value: -[
-  {
-    "items": {
-      "additionalProperties": true,
-      "properties": {
-        "connection": {
-          "type": "string"
-        },
-        "error": {
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "execution_ms": {
-          "$ref": "#/properties/data/anyOf/0/items/properties/rows/anyOf/2"
-        },
-        "rows": {
-          "anyOf": [
-            {
-              "items": {
-                "additionalProperties": {},
-                "type": "object"
-              },
-              "type": "array"
-            },
-            {
-              "type": "null"
-            },
-            {
-              "type": [
-                "number",
-                "string"
-              ]
-            }
-          ]
-        },
-        "sample": {
-          "items": {
-            "additionalProperties": {},
-            "type": "object"
-          },
-          "type": "array"
-        }
-      },
-      "required": [
-        "connection"
-      ],
-      "type": "object"
-    },
-    "type": "array"
-  },
-  {
-    "additionalProperties": true,
-    "properties": {
-      "code": {
-        "type": "string"
-      },
-      "details": {
-        "additionalProperties": {},
-        "type": "object"
-      },
-      "error": {
-        "type": "string"
-      },
-      "internal_code": {
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "retry_after_s": {
-        "type": "number"
-      }
-    },
-    "required": [
-      "error"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "items": {
+      "additionalProperties": true,
+      "properties": {
+        "connection": {
+          "type": "string"
+        },
+        "error": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "execution_ms": {
+          "$ref": "#/properties/data/anyOf/0/items/properties/rows/anyOf/2"
+        },
+        "rows": {
+          "anyOf": [
+            {
+              "items": {
+                "additionalProperties": {},
+                "type": "object"
+              },
+              "type": "array"
+            },
+            {
+              "type": "null"
+            },
+            {
+              "type": [
+                "number",
+                "string"
+              ]
+            }
+          ]
+        },
+        "sample": {
+          "items": {
+            "additionalProperties": {},
+            "type": "object"
+          },
+          "type": "array"
+        }
+      },
+      "required": [
+        "connection"
+      ],
+      "type": "object"
+    },
+    "type": "array"
+  },
+  {
+    "additionalProperties": true,
+    "properties": {
+      "code": {
+        "type": "string"
+      },
+      "details": {
+        "additionalProperties": {},
+        "type": "object"
+      },
+      "error": {
+        "type": "string"
+      },
+      "internal_code": {
+        "type": "string"
+      },
+      "message": {
+        "type": "string"
+      },
+      "retry_after_s": {
+        "type": "number"
+      },
+      "retryable": {
+        "type": "boolean"
+      }
+    },
+    "required": [
+      "error"
+    ],
+    "type": "object"
+  }
+]
    • addedOutput schema / properties / meta / properties / maskedCells
      Added value: +{
+  "type": "number"
+}
    • addedOutput schema / properties / meta / properties / maskedColumns
      Added value: +{
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}
    • addedOutput schema / properties / meta / properties / rowCapReached
      Added value: +{
+  "type": "boolean"
+}
  2. Changed1 schema field changed
    • changedOutput schema / properties / data / anyOf
      Previous value: -[
-  {
-    "items": {
-      "additionalProperties": true,
-      "properties": {
-        "connection": {
-          "type": "string"
-        },
-        "error": {
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "execution_ms": {
-          "$ref": "#/properties/data/anyOf/0/items/properties/rows/anyOf/2"
-        },
-        "rows": {
-          "anyOf": [
-            {
-              "items": {
-                "additionalProperties": {},
-                "type": "object"
-              },
-              "type": "array"
-            },
-            {
-              "type": "null"
-            },
-            {
-              "type": [
-                "number",
-                "string"
-              ]
-            }
-          ]
-        },
-        "sample": {
-          "items": {
-            "additionalProperties": {},
-            "type": "object"
-          },
-          "type": "array"
-        }
-      },
-      "required": [
-        "connection"
-      ],
-      "type": "object"
-    },
-    "type": "array"
-  },
-  {
-    "additionalProperties": true,
-    "properties": {
-      "code": {
-        "type": "string"
-      },
-      "details": {
-        "additionalProperties": {},
-        "type": "object"
-      },
-      "error": {
-        "type": "string"
-      },
-      "internal_code": {
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "retry_after_s": {
-        "type": "number"
-      }
-    },
-    "type": "object"
-  }
-]New value: +[
+  {
+    "items": {
+      "additionalProperties": true,
+      "properties": {
+        "connection": {
+          "type": "string"
+        },
+        "error": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "execution_ms": {
+          "$ref": "#/properties/data/anyOf/0/items/properties/rows/anyOf/2"
+        },
+        "rows": {
+          "anyOf": [
+            {
+              "items": {
+                "additionalProperties": {},
+                "type": "object"
+              },
+              "type": "array"
+            },
+            {
+              "type": "null"
+            },
+            {
+              "type": [
+                "number",
+                "string"
+              ]
+            }
+          ]
+        },
+        "sample": {
+          "items": {
+            "additionalProperties": {},
+            "type": "object"
+          },
+          "type": "array"
+        }
+      },
+      "required": [
+        "connection"
+      ],
+      "type": "object"
+    },
+    "type": "array"
+  },
+  {
+    "additionalProperties": true,
+    "properties": {
+      "code": {
+        "type": "string"
+      },
+      "details": {
+        "additionalProperties": {},
+        "type": "object"
+      },
+      "error": {
+        "type": "string"
+      },
+      "internal_code": {
+        "type": "string"
+      },
+      "message": {
+        "type": "string"
+      },
+      "retry_after_s": {
+        "type": "number"
+      }
+    },
+    "required": [
+      "error"
+    ],
+    "type": "object"
+  }
+]
  3. Changed2 schema fields changed
    • addedInput schema / properties / connections / items / maxLength
      Added value: +256
    • addedInput schema / properties / sql / maxLength
      Added value: +50000
  4. Changed2 schema fields changed
    • addedOutput schema / properties / display / properties / map
      Added value: +{
+  "additionalProperties": true,
+  "properties": {
+    "label": {
+      "type": "string"
+    },
+    "lat": {
+      "type": "string"
+    },
+    "lon": {
+      "type": "string"
+    },
+    "title": {
+      "type": "string"
+    }
+  },
+  "type": "object"
+}
    • changedOutput schema / properties / display / properties / type / anyOf
      Previous value: -[
-  {
-    "enum": [
-      "table",
-      "chart",
-      "metric",
-      "code",
-      "text",
-      "list"
-    ],
-    "type": "string"
-  },
-  {
-    "type": "string"
-  }
-]New value: +[
+  {
+    "enum": [
+      "table",
+      "chart",
+      "metric",
+      "code",
+      "text",
+      "list",
+      "map"
+    ],
+    "type": "string"
+  },
+  {
+    "type": "string"
+  }
+]
  5. Changed1 schema field changed
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": true,
+  "properties": {
+    "data": {
+      "anyOf": [
+        {
+          "items": {
+            "additionalProperties": true,
+            "properties": {
+              "connection": {
+                "type": "string"
+              },
+              "error": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "execution_ms": {
+                "$ref": "#/properties/data/anyOf/0/items/properties/rows/anyOf/2"
+              },
+              "rows": {
+                "anyOf": [
+                  {
+                    "items": {
+                      "additionalProperties": {},
+                      "type": "object"
+                    },
+                    "type": "array"
+                  },
+                  {
+                    "type": "null"
+                  },
+                  {
+                    "type": [
+                      "number",
+                      "string"
+                    ]
+                  }
+                ]
+              },
+              "sample": {
+                "items": {
+                  "additionalProperties": {},
+                  "type": "object"
+                },
+                "type": "array"
+              }
+            },
+            "required": [
+              "connection"
+            ],
+            "type": "object"
+          },
+          "type": "array"
+        },
+        {
+          "additionalProperties": true,
+          "properties": {
+            "code": {
+              "type": "string"
+            },
+            "details": {
+              "additionalProperties": {},
+              "type": "object"
+            },
+            "error": {
+              "type": "string"
+            },
+            "internal_code": {
+              "type": "string"
+            },
+            "message": {
+              "type": "string"
+            },
+            "retry_after_s": {
+              "type": "number"
+            }
+          },
+          "type": "object"
+        }
+      ]
+    },
+    "display": {
+      "additionalProperties": true,
+      "properties": {
+        "chart": {
+          "additionalProperties": true,
+          "properties": {
+            "chartType": {
+              "type": "string"
+            },
+            "color": {
+              "type": "string"
+            },
+            "title": {
+              "type": "string"
+            },
+            "x": {
+              "type": "string"
+            },
+            "xLabel": {
+              "type": "string"
+            },
+            "y": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "items": {
+                    "type": "string"
+                  },
+                  "type": "array"
+                }
+              ]
+            },
+            "yLabel": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "code": {
+          "additionalProperties": true,
+          "properties": {
+            "executable": {
+              "type": "boolean"
+            },
+            "language": {
+              "anyOf": [
+                {
+                  "enum": [
+                    "sql",
+                    "json",
+                    "bash",
+                    "typescript"
+                  ],
+                  "type": "string"
+                },
+                {
+                  "type": "string"
+                }
+              ]
+            },
+            "title": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "metric": {
+          "additionalProperties": true,
+          "properties": {
+            "label": {
+              "type": "string"
+            },
+            "status": {
+              "anyOf": [
+                {
+                  "enum": [
+                    "good",
+                    "warning",
+                    "critical"
+                  ],
+                  "type": "string"
+                },
+                {
+                  "type": "string"
+                }
+              ]
+            },
+            "trend": {
+              "anyOf": [
+                {
+                  "enum": [
+                    "up",
+                    "down",
+                    "neutral"
+                  ],
+                  "type": "string"
+                },
+                {
+                  "type": "string"
+                }
+              ]
+            },
+            "trendValue": {
+              "type": "string"
+            },
+            "unit": {
+              "type": "string"
+            },
+            "value": {
+              "type": [
+                "string",
+                "number"
+              ]
+            }
+          },
+          "type": "object"
+        },
+        "type": {
+          "anyOf": [
+            {
+              "enum": [
+                "table",
+                "chart",
+                "metric",
+                "code",
+                "text",
+                "list"
+              ],
+              "type": "string"
+            },
+            {
+              "type": "string"
+            }
+          ]
+        }
+      },
+      "type": "object"
+    },
+    "insights": {
+      "items": {
+        "additionalProperties": true,
+        "properties": {
+          "column": {
+            "type": "string"
+          },
+          "message": {
+            "type": "string"
+          },
+          "severity": {
+            "anyOf": [
+              {
+                "enum": [
+                  "info",
+                  "warning",
+                  "critical"
+                ],
+                "type": "string"
+              },
+              {
+                "type": "string"
+              }
+            ]
+          },
+          "value": {}
+        },
+        "required": [
+          "severity",
+          "message"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "meta": {
+      "additionalProperties": true,
+      "properties": {
+        "cacheHit": {
+          "type": "boolean"
+        },
+        "connection": {
+          "type": "string"
+        },
+        "dialect": {
+          "anyOf": [
+            {
+              "enum": [
+                "postgres",
+                "mysql",
+                "mssql"
+              ],
+              "type": "string"
+            },
+            {
+              "type": "string"
+            }
+          ]
+        },
+        "executionTimeMs": {
+          "$ref": "#/properties/data/anyOf/0/items/properties/rows/anyOf/2"
+        },
+        "plan": {},
+        "rowCount": {
+          "$ref": "#/properties/data/anyOf/0/items/properties/rows/anyOf/2"
+        },
+        "tool": {
+          "type": "string"
+        },
+        "truncated": {
+          "type": "boolean"
+        }
+      },
+      "type": "object"
+    },
+    "summary": {
+      "type": "string"
+    }
+  },
+  "type": "object"
+}
  6. First observed

TDQS

A4.8/5.0
Behavior5/5

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

Annotations already declare readOnly/openWorld/idempotent, but the description adds non-obvious behavior: it fails per-connection on unknown names, returns rows plus errors per connection rather than aborting, and enforces a hard 4-connection cap. This is exactly the extra context annotations cannot carry.

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?

The critical dialect warning is front-loaded and bolded, followed by behavior, use cases, prerequisite, and cap in logical order. Dense but each clause carries information; the example arrays are slightly redundant with the schema examples but not wasteful.

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?

With an output schema present, return values need not be explained; the description instead covers the things the schema cannot — dialect portability, cap, name-resolution prerequisite, and per-connection error semantics — leaving no material gap for correct invocation.

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% (baseline 3), and the description still adds value: it stresses that `connections` takes NAMES not IDs, gives concrete example arrays, and warns that `sql` must be dialect-portable with specific `TOP`/`LIMIT` failure cases. Strong semantic reinforcement beyond the schema.

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?

States a specific verb+resource: 'Run the same query across 2-4 connections in parallel; returns per-connection rows + errors for diffing.' This clearly distinguishes it from the single-connection sibling query_sql and names the diffing outcome, so an agent can select it without opening the schema.

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

Usage Guidelines5/5

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

Explicitly names the prerequisite (resolve every connection name via `list_connections` first), the failure mode on unknown names, the 4-connection cap and the workaround (split into sequential calls of ≤4), plus four canonical use cases. When and how-to-use are fully specified.

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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