ThinAir Data

pii_scan

Read-onlyIdempotent

Sweep string columns across tables for common PII patterns (email, SSN, credit card, phone, JWT, bearer tokens). Heuristic-only — not a compliance guarantee. [BUILD tier]

Input Schema

Name	Required	Description
`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.
`max_tables`	No	Max tables to sample (default 25, cap 50)
`sample_rows`	No	Rows sampled per table (default 20, cap 100; values < 5 are floored to 5)

Output Schema

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

Schema Changelog

Changes observed during successful MCP inspections.

Changed14 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: -[
-  {
-    "items": {
-      "additionalProperties": true,
-      "properties": {
-        "column": {
-          "type": "string"
-        },
-        "kind": {
-          "type": "string"
-        },
-        "sample_matches": {
-          "type": [
-            "number",
-            "string"
-          ]
-        },
-        "sampled_rows": {
-          "$ref": "#/properties/data/anyOf/0/items/properties/sample_matches"
-        },
-        "severity": {
-          "anyOf": [
-            {
-              "enum": [
-                "info",
-                "warning",
-                "critical"
-              ],
-              "type": "string"
-            },
-            {
-              "type": "string"
-            }
-          ]
-        },
-        "table": {
-          "type": "string"
-        }
-      },
-      "required": [
-        "table",
-        "column",
-        "kind",
-        "severity"
-      ],
-      "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"
-  }
-]New value: +[
+  {
+    "items": {
+      "additionalProperties": {},
+      "properties": {
+        "column": {
+          "type": "string"
+        },
+        "kind": {
+          "type": "string"
+        },
+        "sample_matches": {
+          "type": [
+            "number",
+            "string"
+          ]
+        },
+        "sampled_rows": {
+          "type": [
+            "number",
+            "string"
+          ]
+        },
+        "severity": {
+          "anyOf": [
+            {
+              "enum": [
+                "info",
+                "warning",
+                "critical"
+              ],
+              "type": "string"
+            },
+            {
+              "type": "string"
+            }
+          ]
+        },
+        "table": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "table",
+        "column",
+        "kind",
+        "severity"
+      ],
+      "type": "object"
+    },
+    "type": "array"
+  },
+  {
+    "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 / executionTimeMs / $ref

Removed value: -"#/properties/data/anyOf/0/items/properties/sample_matches"

addedOutput schema / properties / meta / properties / executionTimeMs / type
```
Added value: +[
+  "number",
+  "string"
+]
```

removedOutput schema / properties / meta / properties / rowCount / $ref

Removed value: -"#/properties/data/anyOf/0/items/properties/sample_matches"

addedOutput schema / properties / meta / properties / rowCount / type
```
Added value: +[
+  "number",
+  "string"
+]
```

Changed4 schema fields changedSep 30, 2026

changedOutput schema / properties / data / anyOf

Previous value: -[
-  {
-    "items": {
-      "additionalProperties": true,
-      "properties": {
-        "column": {
-          "type": "string"
-        },
-        "kind": {
-          "type": "string"
-        },
-        "sample_matches": {
-          "type": [
-            "number",
-            "string"
-          ]
-        },
-        "sampled_rows": {
-          "$ref": "#/properties/data/anyOf/0/items/properties/sample_matches"
-        },
-        "severity": {
-          "anyOf": [
-            {
-              "enum": [
-                "info",
-                "warning",
-                "critical"
-              ],
-              "type": "string"
-            },
-            {
-              "type": "string"
-            }
-          ]
-        },
-        "table": {
-          "type": "string"
-        }
-      },
-      "required": [
-        "table",
-        "column",
-        "kind",
-        "severity"
-      ],
-      "type": "object"
-    },
-    "type": "array"
-  },
-  {
-    "additionalProperties": true,
-    "properties": {
-      "code": {
-        "type": "string"
-      },
-      "details": {
-        "additionalProperties": {},
-        "type": "object"
-      },
-      "error": {
-        "type": "string"
-      },
-      "internal_code": {
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "retry_after_s": {
-        "type": "number"
-      }
-    },
-    "required": [
-      "error"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "items": {
+      "additionalProperties": true,
+      "properties": {
+        "column": {
+          "type": "string"
+        },
+        "kind": {
+          "type": "string"
+        },
+        "sample_matches": {
+          "type": [
+            "number",
+            "string"
+          ]
+        },
+        "sampled_rows": {
+          "$ref": "#/properties/data/anyOf/0/items/properties/sample_matches"
+        },
+        "severity": {
+          "anyOf": [
+            {
+              "enum": [
+                "info",
+                "warning",
+                "critical"
+              ],
+              "type": "string"
+            },
+            {
+              "type": "string"
+            }
+          ]
+        },
+        "table": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "table",
+        "column",
+        "kind",
+        "severity"
+      ],
+      "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"
+}
```

Changed1 schema field changedSep 15, 2026

changedOutput schema / properties / data / anyOf

Previous value: -[
-  {
-    "items": {
-      "additionalProperties": true,
-      "properties": {
-        "column": {
-          "type": "string"
-        },
-        "kind": {
-          "type": "string"
-        },
-        "sample_matches": {
-          "type": [
-            "number",
-            "string"
-          ]
-        },
-        "sampled_rows": {
-          "$ref": "#/properties/data/anyOf/0/items/properties/sample_matches"
-        },
-        "severity": {
-          "anyOf": [
-            {
-              "enum": [
-                "info",
-                "warning",
-                "critical"
-              ],
-              "type": "string"
-            },
-            {
-              "type": "string"
-            }
-          ]
-        },
-        "table": {
-          "type": "string"
-        }
-      },
-      "required": [
-        "table",
-        "column",
-        "kind",
-        "severity"
-      ],
-      "type": "object"
-    },
-    "type": "array"
-  },
-  {
-    "additionalProperties": true,
-    "properties": {
-      "code": {
-        "type": "string"
-      },
-      "details": {
-        "additionalProperties": {},
-        "type": "object"
-      },
-      "error": {
-        "type": "string"
-      },
-      "internal_code": {
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "retry_after_s": {
-        "type": "number"
-      }
-    },
-    "type": "object"
-  }
-]New value: +[
+  {
+    "items": {
+      "additionalProperties": true,
+      "properties": {
+        "column": {
+          "type": "string"
+        },
+        "kind": {
+          "type": "string"
+        },
+        "sample_matches": {
+          "type": [
+            "number",
+            "string"
+          ]
+        },
+        "sampled_rows": {
+          "$ref": "#/properties/data/anyOf/0/items/properties/sample_matches"
+        },
+        "severity": {
+          "anyOf": [
+            {
+              "enum": [
+                "info",
+                "warning",
+                "critical"
+              ],
+              "type": "string"
+            },
+            {
+              "type": "string"
+            }
+          ]
+        },
+        "table": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "table",
+        "column",
+        "kind",
+        "severity"
+      ],
+      "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"
+  }
+]

Changed6 schema fields changedAug 17, 2026
- addedInput schema / properties / connection / maxLength
```
Added value: +256
```
- addedInput schema / properties / max_tables / maximum
```
Added value: +50
```
- addedInput schema / properties / max_tables / minimum
```
Added value: +1
```
- changedInput schema / properties / sample_rows / description
```
Previous value: -"Rows sampled per table (default 20, cap 100)"New value: +"Rows sampled per table (default 20, cap 100; values < 5 are floored to 5)"
```
- addedInput schema / properties / sample_rows / maximum
```
Added value: +100
```
- addedInput schema / properties / sample_rows / minimum
```
Added value: +1
```

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: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": true,
+  "properties": {
+    "data": {
+      "anyOf": [
+        {
+          "items": {
+            "additionalProperties": true,
+            "properties": {
+              "column": {
+                "type": "string"
+              },
+              "kind": {
+                "type": "string"
+              },
+              "sample_matches": {
+                "type": [
+                  "number",
+                  "string"
+                ]
+              },
+              "sampled_rows": {
+                "$ref": "#/properties/data/anyOf/0/items/properties/sample_matches"
+              },
+              "severity": {
+                "anyOf": [
+                  {
+                    "enum": [
+                      "info",
+                      "warning",
+                      "critical"
+                    ],
+                    "type": "string"
+                  },
+                  {
+                    "type": "string"
+                  }
+                ]
+              },
+              "table": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "table",
+              "column",
+              "kind",
+              "severity"
+            ],
+            "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": {
+          "$ref": "#/properties/data/anyOf/0/items/properties/sample_matches"
+        },
+        "plan": {},
+        "rowCount": {
+          "$ref": "#/properties/data/anyOf/0/items/properties/sample_matches"
+        },
+        "tool": {
+          "type": "string"
+        },
+        "truncated": {
+          "type": "boolean"
+        }
+      },
+      "type": "object"
+    },
+    "summary": {
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

First observedApr 28, 2026

TDQS

A3.8/5.0

Behavior4/5

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

Annotations already cover the safety profile (readOnlyHint, idempotentHint, openWorldHint), so the description's job is to add context — and it does, by disclosing that detection is heuristic and not a compliance guarantee, a material accuracy caveat the agent needs when reporting results. It stops short of noting cost/runtime or credential prerequisites, keeping it below a 5.

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?

Two compact sentences with zero filler: the capability and pattern list come first, followed immediately by the accuracy caveat. Nothing is repeated from the schema or annotations.

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

Completeness4/5

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

An output schema exists so return values need no explanation, and annotations cover safety; the description supplies scope and the heuristic caveat. The only real gap is the unexplained '[BUILD tier]' marker and no hint about runtime cost across up to 50 tables.

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 description coverage is 100%; the schema fully documents connection resolution, max_tables, sample_rows and their defaults/caps. The description adds no parameter-level meaning, so the baseline 3 applies.

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 ('sweep') plus resource ('string columns across tables') and enumerates the exact pattern classes detected (email, SSN, credit card, phone, JWT, bearer tokens), so the agent knows precisely what the tool returns. It does not, however, distinguish itself from the closely related sibling data_profile, which an agent could reasonably confuse it with.

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 by the scan framing and sharpened by the 'Heuristic-only — not a compliance guarantee' caveat, but there is no explicit when-to-use/when-not guidance and no named alternative (e.g. data_profile) for broader profiling needs. The '[BUILD tier]' tag hints at a prerequisite/tier gate but is not explained.

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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