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impact_analysis

Read-onlyIdempotent

Analyze the blast radius of a proposed schema change: FK dependencies, affected views, row count, risk score. [ARCHITECT tier]

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
intentYesDescribe the change: 'rename vehicle_id to vehicle_uuid on trips', 'drop column X'
connectionNoTarget connection name from this tenant's inventory. Call `list_connections` to see every name + dialect, then match semantically to the user's intent (e.g. 'analytics' → a connection named `*-analytics-*`; 'prod' → a connection with `prod-` prefix). If the user didn't specify, use the tenant's default (first added). Do not invent names — resolve from `list_connections` output.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
dataNo
metaNo
displayNo
summaryNo
insightsNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedOutput schema / properties / data / anyOf
      Previous value: -[
-  {
-    "additionalProperties": true,
-    "properties": {
-      "affected_views": {
-        "items": {},
-        "type": "array"
-      },
-      "analysis_scope": {
-        "enum": [
-          "table",
-          "column"
-        ],
-        "type": "string"
-      },
-      "dependency_risk": {
-        "type": "string"
-      },
-      "fk_dependencies": {
-        "items": {
-          "additionalProperties": true,
-          "properties": {
-            "column": {
-              "type": "string"
-            },
-            "direction": {
-              "type": "string"
-            },
-            "references": {
-              "type": "string"
-            },
-            "references_column": {
-              "type": "string"
-            },
-            "table": {
-              "type": "string"
-            }
-          },
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "fk_dependencies_evaluated": {
-        "type": "boolean"
-      },
-      "intent": {
-        "type": "string"
-      },
-      "operation_risk": {
-        "type": "string"
-      },
-      "recommendation": {
-        "type": "string"
-      },
-      "risk": {
-        "type": "string"
-      },
-      "row_count": {
-        "type": [
-          "number",
-          "string"
-        ]
-      },
-      "target": {
-        "additionalProperties": true,
-        "properties": {
-          "action": {
-            "type": "string"
-          },
-          "column": {
-            "type": "string"
-          },
-          "object_type": {
-            "type": "string"
-          },
-          "table": {
-            "type": "string"
-          }
-        },
-        "type": "object"
-      },
-      "target_table": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "target_table"
-    ],
-    "type": "object"
-  },
-  {
-    "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: +[
+  {
+    "additionalProperties": true,
+    "properties": {
+      "affected_views": {
+        "items": {},
+        "type": "array"
+      },
+      "analysis_scope": {
+        "enum": [
+          "table",
+          "column"
+        ],
+        "type": "string"
+      },
+      "dependency_risk": {
+        "type": "string"
+      },
+      "fk_dependencies": {
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "column": {
+              "type": "string"
+            },
+            "direction": {
+              "type": "string"
+            },
+            "references": {
+              "type": "string"
+            },
+            "references_column": {
+              "type": "string"
+            },
+            "table": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "fk_dependencies_evaluated": {
+        "type": "boolean"
+      },
+      "intent": {
+        "type": "string"
+      },
+      "operation_risk": {
+        "type": "string"
+      },
+      "recommendation": {
+        "type": "string"
+      },
+      "risk": {
+        "type": "string"
+      },
+      "row_count": {
+        "type": [
+          "number",
+          "string"
+        ]
+      },
+      "target": {
+        "additionalProperties": true,
+        "properties": {
+          "action": {
+            "type": "string"
+          },
+          "column": {
+            "type": "string"
+          },
+          "object_type": {
+            "type": "string"
+          },
+          "table": {
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "target_table": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "target_table"
+    ],
+    "type": "object"
+  },
+  {
+    "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"
+  }
+]
  2. Changed1 schema field changed
    • changedOutput schema / properties / data / anyOf
      Previous value: -[
-  {
-    "additionalProperties": true,
-    "properties": {
-      "affected_views": {
-        "items": {},
-        "type": "array"
-      },
-      "fk_dependencies": {
-        "items": {
-          "additionalProperties": true,
-          "properties": {
-            "column": {
-              "type": "string"
-            },
-            "references": {
-              "type": "string"
-            },
-            "table": {
-              "type": "string"
-            }
-          },
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "intent": {
-        "type": "string"
-      },
-      "recommendation": {
-        "type": "string"
-      },
-      "risk": {
-        "type": "string"
-      },
-      "row_count": {
-        "type": [
-          "number",
-          "string"
-        ]
-      },
-      "target_table": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "target_table"
-    ],
-    "type": "object"
-  },
-  {
-    "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: +[
+  {
+    "additionalProperties": true,
+    "properties": {
+      "affected_views": {
+        "items": {},
+        "type": "array"
+      },
+      "analysis_scope": {
+        "enum": [
+          "table",
+          "column"
+        ],
+        "type": "string"
+      },
+      "dependency_risk": {
+        "type": "string"
+      },
+      "fk_dependencies": {
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "column": {
+              "type": "string"
+            },
+            "direction": {
+              "type": "string"
+            },
+            "references": {
+              "type": "string"
+            },
+            "references_column": {
+              "type": "string"
+            },
+            "table": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "fk_dependencies_evaluated": {
+        "type": "boolean"
+      },
+      "intent": {
+        "type": "string"
+      },
+      "operation_risk": {
+        "type": "string"
+      },
+      "recommendation": {
+        "type": "string"
+      },
+      "risk": {
+        "type": "string"
+      },
+      "row_count": {
+        "type": [
+          "number",
+          "string"
+        ]
+      },
+      "target": {
+        "additionalProperties": true,
+        "properties": {
+          "action": {
+            "type": "string"
+          },
+          "column": {
+            "type": "string"
+          },
+          "object_type": {
+            "type": "string"
+          },
+          "table": {
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "target_table": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "target_table"
+    ],
+    "type": "object"
+  },
+  {
+    "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"
+  }
+]
  3. Changed3 schema fields changed
    • addedInput schema / properties / connection / maxLength
      Added value: +256
    • changedInput schema / properties / intent / description
      Previous value: -"Describe the change: 'rename customer_id to account_id', 'drop column X'"New value: +"Describe the change: 'rename vehicle_id to vehicle_uuid on trips', 'drop column X'"
    • addedInput schema / properties / intent / maxLength
      Added value: +500
  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": [
+        {
+          "additionalProperties": true,
+          "properties": {
+            "affected_views": {
+              "items": {},
+              "type": "array"
+            },
+            "fk_dependencies": {
+              "items": {
+                "additionalProperties": true,
+                "properties": {
+                  "column": {
+                    "type": "string"
+                  },
+                  "references": {
+                    "type": "string"
+                  },
+                  "table": {
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "intent": {
+              "type": "string"
+            },
+            "recommendation": {
+              "type": "string"
+            },
+            "risk": {
+              "type": "string"
+            },
+            "row_count": {
+              "type": [
+                "number",
+                "string"
+              ]
+            },
+            "target_table": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "target_table"
+          ],
+          "type": "object"
+        },
+        {
+          "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/properties/row_count"
+        },
+        "plan": {},
+        "rowCount": {
+          "$ref": "#/properties/data/anyOf/0/properties/row_count"
+        },
+        "tool": {
+          "type": "string"
+        },
+        "truncated": {
+          "type": "boolean"
+        }
+      },
+      "type": "object"
+    },
+    "summary": {
+      "type": "string"
+    }
+  },
+  "type": "object"
+}
  6. First observed

TDQS

A4.2/5.0
Behavior4/5

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

Annotations already declare readOnlyHint, openWorldHint, and idempotentHint, so the description doesn't need to repeat safety. It adds value by specifying what the analysis covers (FK dependencies, views, row count, risk score), which enriches the behavioral picture. The '[ARCHITECT tier]' tag hints at access level, adding context beyond the annotations.

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

Conciseness5/5

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

The description is a single, dense sentence that front-loads the purpose and key outputs, then adds the tier tag. There is zero redundancy, and every element earns its place. It is appropriately sized for a read-only analysis tool.

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?

For a read-only analysis tool with a detailed schema and an output schema, the description is nearly complete. It lacks explicit mention of prerequisites or limitations (e.g., need for an active connection), but the connection parameter description covers resolution. The main gap is not naming sibling alternatives, but that's not essential for calling the tool correctly.

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?

The input schema provides 100% coverage with detailed descriptions for both 'intent' and 'connection', including examples and resolution instructions. The tool description itself adds no parameter-specific details beyond what the schema already offers. Since the schema does the heavy lifting, a baseline of 3 is appropriate.

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 clearly states the tool analyzes blast radius of a schema change, listing specific outputs (FK dependencies, affected views, row count, risk score). This distinguishes it from siblings like analyze_table or describe_schema, which focus on different aspects. The verb 'analyze' and resource 'schema change' make the purpose unambiguous.

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 implies the tool is for assessing the impact of a proposed schema change, which is a clear context. However, it doesn't explicitly mention when not to use it or name alternatives, though the connection parameter description does guide on resolving connection names. The lack of explicit exclusions or sibling references leaves a small gap.

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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