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Python
Hybrid

google_ads_callouts_create

Create a callout asset and link it to a Google Ads campaign to display short promotional text below ads. Returns the new asset's resource name or an error when the campaign already has 20 callouts.

Instructions

Create a callout Asset and link it to a Google Ads campaign in a two-step mutate (AssetService then CampaignAssetService). Returns {resource_name} of the newly created asset, or {error:true, error_type:'validation_error', message} when the campaign already has 20 callouts (_MAX_CALLOUTS_PER_CAMPAIGN limit). Mutating — reversible only by google_ads_callouts_remove. The asset is minted per call, so identical text creates duplicate asset rows. For sitelink variants use google_ads_sitelinks_create.

Input Schema

NameRequiredDescriptionDefault
reasonNoWhy this change is being made: one or two sentences naming the evidence and the expected effect. Stored in the journal and on the action_log entry this call produces, for the operator and the next session.
approvalNoExternal approval this change carries out (recorded and shown, never verified)
expectedNoExpected effects [{metric, direction, target?, horizon_days?, primary?}], exactly one primary:true when several; metric cpa/cpc/cpl/cpm/conversions/cvr/ctr/roas/cost/spend/clicks/impressions; direction up/down/hold.
campaign_idYesCampaign ID as a numeric string without dashes (e.g. '23743184133'). Obtain via google_ads_campaigns_list.
customer_idNoGoogle Ads customer ID as a 10-digit string without dashes (e.g. '1234567890'). Optional — falls back to GOOGLE_ADS_CUSTOMER_ID / GOOGLE_ADS_LOGIN_CUSTOMER_ID from the configured credentials when omitted.
decision_idNoA proposed decision this change carries out.
callout_textYesCallout text shown below the ad (e.g. 'Free shipping', '24/7 support'). Google Ads limit: 25 characters.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changedv0.33.0
    • changedInput schema / properties / expected / description
      Previous value: -"Expected effects [{metric, direction, target?, horizon_days?}]; metric cpa/cpc/cpl/cpm/conversions/cvr/ctr/roas/cost/spend/clicks/impressions; direction up/down/hold."New value: +"Expected effects [{metric, direction, target?, horizon_days?, primary?}], exactly one primary:true when several; metric cpa/cpc/cpl/cpm/conversions/cvr/ctr/roas/cost/spend/clicks/impressions; direction up/down/hold."
  2. Changed1 schema field changedv0.28.0
    • addedInput schema / properties / approval
      Added value: +{
+  "additionalProperties": false,
+  "description": "External approval this change carries out (recorded and shown, never verified)",
+  "properties": {
+    "approved_at": {
+      "maxLength": 64,
+      "type": "string"
+    },
+    "approved_by": {
+      "maxLength": 80,
+      "type": "string"
+    },
+    "reference": {
+      "maxLength": 128,
+      "type": "string"
+    }
+  },
+  "required": [
+    "reference",
+    "approved_by",
+    "approved_at"
+  ],
+  "type": "object"
+}
  3. Changed2 schema fields changedv0.26.0
    • addedInput schema / properties / decision_id
      Added value: +{
+  "description": "A proposed decision this change carries out.",
+  "maxLength": 128,
+  "minLength": 1,
+  "type": "string"
+}
    • addedInput schema / properties / expected
      Added value: +{
+  "description": "Expected effects [{metric, direction, target?, horizon_days?}]; metric cpa/cpc/cpl/cpm/conversions/cvr/ctr/roas/cost/spend/clicks/impressions; direction up/down/hold.",
+  "maxItems": 12,
+  "type": "array"
+}
  4. Changed1 schema field changedv0.20.0
    • addedInput schema / properties / reason
      Added value: +{
+  "description": "Why this change is being made: one or two sentences naming the evidence and the expected effect. Stored in the journal and on the action_log entry this call produces, for the operator and the next session.",
+  "maxLength": 500,
+  "type": "string"
+}
  5. Changed1 schema field changedv0.10.37
    • addedInput schema / additionalProperties
      Added value: +false
  6. Addedv0.10.11
  7. Removedv0.10.9
  8. Addedv0.9.12
  9. Removedv0.9.6
  10. Addedv0.9.2
  11. Removedv0.9.1
  12. Addedv1.0.5

TDQS

A4.6/5.0
Behavior5/5

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

With no annotations, the description carries the full behavioral burden and does so well: it discloses the two-step mutate, the 20-callout limit and validation error, mutating and reversible-only-by-remove behavior, and the duplicate-row risk for identical text. These are exactly the behavioral traits an agent needs before calling.

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 front-loaded with the core action and is tightly structured: purpose, two-step mechanism, return/error shape, mutation/reversal, duplicate behavior, and sibling routing. Every sentence adds operational value.

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?

Given no annotations and no output schema, the description compensates by explaining the two-step mutate, return value, validation error, reversibility, and duplicate risk. It omits some auth/permission context and deeper side-effect details, but is otherwise complete enough 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%, so the schema already documents most parameters. The description adds meaningful semantics beyond the schema by explaining that campaign_id links the asset and that callout_text is minted per call, so identical text creates duplicate asset rows.

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 states a specific verb and resource: create a callout Asset and link it to a Google Ads campaign. It explicitly distinguishes the tool from google_ads_sitelinks_create and google_ads_callouts_remove, so an agent can identify its purpose 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 Guidelines4/5

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

It tells the agent to use google_ads_sitelinks_create for sitelink variants and google_ads_callouts_remove for reversal, which gives clear alternative routing. It does not spell out all preconditions or when not to create a callout, but the primary alternative is explicit.

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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