ThinAir Data

optimize_query

Read-onlyIdempotent

Analyze a SQL query's plan and return ranked optimization recommendations with explanations. Returns a verdict (efficient / needs_attention) plus findings: full/sequential scans, nested-loop joins, and — on mysql — temporary tables and filesorts. It does NOT return a rewritten query; original_query comes back unchanged and any rewrite is yours to author from the recommendations. The plan is ESTIMATED on all three dialects (pg EXPLAIN (ANALYZE false, FORMAT JSON), mysql EXPLAIN, mssql SHOWPLAN_XML) — the query is never executed, so run-time-only conditions such as a sort spilling to disk cannot be detected and are not reported. Ready-to-run index DDL is available only on mssql, where SHOWPLAN carries the optimizer's own missing-index statements; on postgres/mysql the recommendation names the WHERE/JOIN columns to index instead. [BUILD tier]

Input Schema

Name	Required	Description	Default
`query`	Yes	SQL query to optimize
`connection`	No	Target 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

Name	Required	Description	Default
`data`	No
`meta`	No
`display`	No
`summary`	No
`insights`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed12 schema fields changedOct 31, 2026

removedInput schema / additionalProperties
```
Removed value: -false
```
changedOutput schema / additionalProperties
```
Previous value: -trueNew value: +{}
```

changedOutput schema / properties / data / anyOf

Previous value: -[
-  {
-    "additionalProperties": true,
-    "properties": {
-      "node_types": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "original_query": {
-        "type": "string"
-      },
-      "recommendations": {
-        "items": {},
-        "type": "array"
-      },
-      "verdict": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "verdict"
-    ],
-    "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"
-      },
-      "retryable": {
-        "type": "boolean"
-      }
-    },
-    "required": [
-      "error"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": {},
+    "properties": {
+      "node_types": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "original_query": {
+        "type": "string"
+      },
+      "recommendations": {
+        "items": {},
+        "type": "array"
+      },
+      "verdict": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "verdict"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": {},
+    "properties": {
+      "code": {
+        "type": "string"
+      },
+      "details": {
+        "additionalProperties": {},
+        "propertyNames": {
+          "type": "string"
+        },
+        "type": "object"
+      },
+      "error": {
+        "type": "string"
+      },
+      "internal_code": {
+        "type": "string"
+      },
+      "message": {
+        "type": "string"
+      },
+      "retry_after_s": {
+        "type": "number"
+      },
+      "retryable": {
+        "type": "boolean"
+      }
+    },
+    "required": [
+      "error"
+    ],
+    "type": "object"
+  }
+]

changedOutput schema / properties / display / additionalProperties
```
Previous value: -trueNew value: +{}
```
changedOutput schema / properties / display / properties / chart / additionalProperties
```
Previous value: -trueNew value: +{}
```
changedOutput schema / properties / display / properties / code / additionalProperties
```
Previous value: -trueNew value: +{}
```
changedOutput schema / properties / display / properties / map / additionalProperties
```
Previous value: -trueNew value: +{}
```
changedOutput schema / properties / display / properties / metric / additionalProperties
```
Previous value: -trueNew value: +{}
```
changedOutput schema / properties / insights / items / additionalProperties
```
Previous value: -trueNew value: +{}
```
changedOutput schema / properties / meta / additionalProperties
```
Previous value: -trueNew value: +{}
```
removedOutput schema / properties / meta / properties / rowCount / $ref
```
Removed value: -"#/properties/meta/properties/executionTimeMs"
```
addedOutput schema / properties / meta / properties / rowCount / type
```
Added value: +[
+  "number",
+  "string"
+]
```

Changed4 schema fields changedSep 30, 2026

changedOutput schema / properties / data / anyOf

Previous value: -[
-  {
-    "additionalProperties": true,
-    "properties": {
-      "node_types": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "original_query": {
-        "type": "string"
-      },
-      "recommendations": {
-        "items": {},
-        "type": "array"
-      },
-      "verdict": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "verdict"
-    ],
-    "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"
-  }
-]New value: +[
+  {
+    "additionalProperties": true,
+    "properties": {
+      "node_types": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "original_query": {
+        "type": "string"
+      },
+      "recommendations": {
+        "items": {},
+        "type": "array"
+      },
+      "verdict": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "verdict"
+    ],
+    "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"
+      },
+      "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"
+}
```

Changed1 schema field changedSep 15, 2026

changedOutput schema / properties / data / anyOf

Previous value: -[
-  {
-    "additionalProperties": true,
-    "properties": {
-      "node_types": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "original_query": {
-        "type": "string"
-      },
-      "recommendations": {
-        "items": {},
-        "type": "array"
-      },
-      "verdict": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "verdict"
-    ],
-    "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": {
+      "node_types": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "original_query": {
+        "type": "string"
+      },
+      "recommendations": {
+        "items": {},
+        "type": "array"
+      },
+      "verdict": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "verdict"
+    ],
+    "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"
+  }
+]

Changed2 schema fields changedAug 17, 2026
- addedInput schema / properties / connection / maxLength
```
Added value: +256
```
- addedInput schema / properties / query / maxLength
```
Added value: +50000
```

Changed2 schema fields changedMay 5, 2026

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"
+  }
+]

Changed1 schema field changedMay 1, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": true,
+  "properties": {
+    "data": {
+      "anyOf": [
+        {
+          "additionalProperties": true,
+          "properties": {
+            "node_types": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "original_query": {
+              "type": "string"
+            },
+            "recommendations": {
+              "items": {},
+              "type": "array"
+            },
+            "verdict": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "verdict"
+          ],
+          "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": {
+          "type": [
+            "number",
+            "string"
+          ]
+        },
+        "plan": {},
+        "rowCount": {
+          "$ref": "#/properties/meta/properties/executionTimeMs"
+        },
+        "tool": {
+          "type": "string"
+        },
+        "truncated": {
+          "type": "boolean"
+        }
+      },
+      "type": "object"
+    },
+    "summary": {
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

First observedApr 28, 2026

TDQS

A4.1/5.0

Behavior5/5

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

Goes well beyond the annotations: it discloses that plans are ESTIMATED via the exact dialect-specific statements, that the query is never executed, and the concrete consequence (run-time-only conditions like a sort spilling to disk are not reported). It also scopes a capability by dialect — ready-to-run index DDL only on mssql, column names on postgres/mysql — which is exactly the kind of behavioral detail 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.

Conciseness5/5

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

Front-loaded with the outcome (ranked recommendations), then limits, then dialect behavior — every sentence carries non-redundant information, including the important 'rewrite is yours to author' clause. The only near-waste is the unexplained '[BUILD tier]' tag, which is too small a blemish to offset the density.

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, the description correctly avoids enumerating return fields and instead covers what the schema cannot: estimation vs. execution semantics, dialect-specific gaps, and what the tool deliberately omits. Nothing an agent needs in order to call it correctly or interpret results is missing.

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?

Schema coverage is 100% and the `connection` parameter already documents the list_connections resolution workflow in detail, so the schema does the heavy lifting. The description adds only indirect meaning — that dialect-dependent behavior follows from the target connection — without naming or explaining either parameter.

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

Purpose4/5

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

States a specific verb and resource — analyze a SQL query's plan and return ranked optimization recommendations — plus the scope of findings (scans, nested-loop joins, mysql temp tables/filesorts) and the verdict values. It does not name or differentiate itself from likely-adjacent siblings such as explain_query or analyze_table, so an agent must infer that distinction from names alone.

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

Usage Guidelines3/5

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

Usage is implied rather than stated: you call it when you want optimization advice, and the explicit negative ('does NOT return a rewritten query') clarifies the expected output shape, not when to prefer this over explain_query or query_sql. The '[BUILD tier]' suffix is unexplained jargon that gives no actionable routing signal.

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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