AdsAgent — Google Ads MCP

google_ads_keyword_historical_metrics

Read-only

Read bounded keyword historical metrics in the account currency; near-exact deduplication may omit inputs.

Input Schema

Name	Required	Description
`body`	Yes
`customer_id`	Yes	10-digit Google Ads customer id.
`connection_context`	No

Output Schema

Name	Required	Description	Default
`ok`	No
`code`	No
`data`	No
`kind`	No
`error`	No
`needs`	No
`reason`	No
`source`	No
`request`	No
`retryable`	No
`time_zone`	No
`error_code`	No
`request_id`	No
`next_action`	No
`observed_at`	No
`support_ref`	No
`availability`	No
`currency_code`	No
`invalid_fields`	No
`rejected_paths`	No
`origin_support_ref`	No
`forecast_not_guarantee`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 28, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "properties": {
+    "availability": {
+      "type": "string"
+    },
+    "code": {
+      "type": "string"
+    },
+    "currency_code": {
+      "type": "string"
+    },
+    "data": {
+      "additionalProperties": true,
+      "properties": {},
+      "type": "object"
+    },
+    "error": {
+      "anyOf": [
+        {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "additionalProperties": true,
+              "properties": {
+                "code": {
+                  "type": "string"
+                },
+                "details": {
+                  "additionalProperties": true,
+                  "properties": {},
+                  "type": "object"
+                },
+                "message": {
+                  "type": "string"
+                },
+                "retryable": {
+                  "type": "boolean"
+                },
+                "support_ref": {
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            }
+          ]
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "error_code": {
+      "type": "string"
+    },
+    "forecast_not_guarantee": {
+      "type": "boolean"
+    },
+    "invalid_fields": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "kind": {
+      "type": "string"
+    },
+    "needs": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "next_action": {
+      "anyOf": [
+        {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "additionalProperties": true,
+              "properties": {},
+              "type": "object"
+            }
+          ]
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "observed_at": {
+      "type": "string"
+    },
+    "ok": {
+      "type": "boolean"
+    },
+    "origin_support_ref": {
+      "type": "string"
+    },
+    "reason": {
+      "type": "string"
+    },
+    "rejected_paths": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "request": {
+      "additionalProperties": true,
+      "properties": {},
+      "type": "object"
+    },
+    "request_id": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "retryable": {
+      "type": "boolean"
+    },
+    "source": {
+      "type": "string"
+    },
+    "support_ref": {
+      "type": "string"
+    },
+    "time_zone": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "type": "object"
+}

Changed5 schema fields changedOct 20, 2026
- addedInput schema / properties / body / properties / language
```
Added value: +{
+  "minLength": 1,
+  "type": "string"
+}
```
- addedInput schema / properties / body / properties / language_id / default
```
Added value: +"1000"
```
- addedInput schema / properties / body / properties / language_id / description
```
Added value: +"Legacy Google language_constant; prefer language by name. The default is English."
```
- removedInput schema / properties / body / properties / language_id / minLength
```
Removed value: -1
```
- changedInput schema / properties / body / required
```
Previous value: -[
-  "keywords",
-  "language_id",
-  "geo_target_ids"
-]New value: +[
+  "keywords",
+  "geo_target_ids"
+]
```
Changed1 schema field changedOct 13, 2026
- addedInput schema / properties / connection_context
```
Added value: +{
+  "pattern": "^mctx_v1_[0-9a-f]{64}$",
+  "type": "string"
+}
```
AddedOct 4, 2026

TDQS

B3.2/5.0

Behavior4/5

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

Annotations already cover the safety profile (readOnly, non-destructive, open-world), so the lower bar applies. The description still adds genuinely non-obvious behavior: results are returned in account currency and near-exact deduplication may silently drop some submitted keywords — a caveat an agent cannot get from the schema.

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?

A single front-loaded sentence with no wasted words; the currency and dedup caveats are packed into one clause. It is efficient, though the phrase "bounded" is left undefined and slightly opaque.

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

Completeness3/5

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 the dedup caveat covers the main non-obvious risk. But with three parameters, a nested body, and 33% schema coverage, the description leaves too much unstated about inputs and about how this differs from the forecast/ideas siblings.

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

Parameters2/5

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

Schema description coverage is only 33% and the description adds nothing about the parameters — no note on the 20-keyword / 10-geo-target caps, the language/language_id precedence, or what connection_context is for. With low coverage, the description needed to compensate and does not.

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 ("read keyword historical metrics") plus a scope qualifier ("bounded", "account currency"). It does not, however, distinguish it from nearby siblings such as google_ads_keyword_forecast_metrics or google_ads_keyword_ideas_generate, so an agent must infer the boundary from the name alone.

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

Usage Guidelines2/5

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

There is no when-to-use guidance, no mention of when historical metrics are preferable to forecast or ideas tools, and no prerequisites such as having a valid customer_id or connection. The agent gets the operation but no routing logic.

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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