Trillboards DOOH Advertising

by io.github.snehdhruv

Overview Discussions Admin

update_media_buy

[AdCP Media Buy] Update an existing media buy (campaign).

Modify budget, targeting, schedule, or status of an existing media buy.

WHEN TO USE:

Adjusting campaign budget mid-flight
Pausing or resuming a campaign
Changing targeting parameters
Extending campaign dates

EXAMPLE: update_media_buy({ media_buy_id: "mbuy_abc123", updates: { status: "paused", budget: { daily_usd: 300 } } })

Input Schema

TableJSON Schema

Name	Required	Description
`ext`	No
`paused`	No
`account`	No
`context`	No
`updates`	No	Fields to update
`canceled`	No
`end_time`	No
`packages`	No
`revision`	No
`start_time`	No
`media_buy_id`	Yes	Media buy ID to update
`new_packages`	No
`idempotency_key`	No
`invoice_recipient`	No
`reporting_webhook`	No
`cancellation_reason`	No
`push_notification_config`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedSep 1, 2026
- changedInput schema / additionalProperties
```
Previous value: -falseNew value: +true
```

Changed3 schema fields changedSep 1, 2026

removedInput schema / properties / adcp_major_version

Removed value: -{
-  "description": "Legacy major-precision AdCP version pin, an integer (e.g. 3), carried since 3.0. Prefer adcp_version. A major this agent does not speak is answered with a VERSION_UNSUPPORTED task failure; get_adcp_capabilities.adcp.major_versions lists the supported set.",
-  "type": "integer"
-}

removedInput schema / properties / adcp_version

Removed value: -{
-  "description": "Release-precision AdCP version this request is pinned to, \"MAJOR.RELEASE\" (e.g. \"3.1\"). A release this agent does not speak is answered with a VERSION_UNSUPPORTED task failure listing the ones it does. Read get_adcp_capabilities.adcp.supported_versions to pin correctly.",
-  "type": "string"
-}

removedInput schema / properties / context / description

Removed value: -"Opaque caller-supplied correlation object. Echoed back byte-for-byte, unparsed, on both successful and failed responses; the agent never reads its contents."

Changed3 schema fields changedSep 1, 2026

addedInput schema / properties / adcp_major_version

Added value: +{
+  "description": "Legacy major-precision AdCP version pin, an integer (e.g. 3), carried since 3.0. Prefer adcp_version. A major this agent does not speak is answered with a VERSION_UNSUPPORTED task failure; get_adcp_capabilities.adcp.major_versions lists the supported set.",
+  "type": "integer"
+}

addedInput schema / properties / adcp_version

Added value: +{
+  "description": "Release-precision AdCP version this request is pinned to, \"MAJOR.RELEASE\" (e.g. \"3.1\"). A release this agent does not speak is answered with a VERSION_UNSUPPORTED task failure listing the ones it does. Read get_adcp_capabilities.adcp.supported_versions to pin correctly.",
+  "type": "string"
+}

addedInput schema / properties / context / description

Added value: +"Opaque caller-supplied correlation object. Echoed back byte-for-byte, unparsed, on both successful and failed responses; the agent never reads its contents."

Changed2 schema fields changedAug 7, 2026
- addedInput schema / properties / media_buy_id / description
```
Added value: +"Media buy ID to update"
```
- addedInput schema / properties / updates / description
```
Added value: +"Fields to update"
```

Changed1 schema field changedAug 6, 2026

addedInput schema / properties / packages / items / properties / creative_assignments

Added value: +{
+  "items": {
+    "additionalProperties": true,
+    "properties": {
+      "creative_id": {
+        "maxLength": 200,
+        "minLength": 1,
+        "type": "string"
+      }
+    },
+    "required": [
+      "creative_id"
+    ],
+    "type": "object"
+  },
+  "maxItems": 100,
+  "type": "array"
+}

Changed1 schema field changedAug 6, 2026

addedInput schema / properties / packages / items / properties / targeting_overlay

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": {},
+      "type": "object"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

Changed14 schema fields changedAug 5, 2026

addedInput schema / properties / account

Added value: +{
+  "additionalProperties": {},
+  "type": "object"
+}

addedInput schema / properties / canceled
```
Added value: +{
+  "type": "boolean"
+}
```

addedInput schema / properties / cancellation_reason

Added value: +{
+  "maxLength": 500,
+  "type": "string"
+}

addedInput schema / properties / end_time
```
Added value: +{
+  "type": "string"
+}
```

addedInput schema / properties / ext

Added value: +{
+  "additionalProperties": {},
+  "type": "object"
+}

addedInput schema / properties / idempotency_key

Added value: +{
+  "maxLength": 200,
+  "type": "string"
+}

addedInput schema / properties / invoice_recipient

Added value: +{
+  "additionalProperties": {},
+  "type": "object"
+}

addedInput schema / properties / new_packages

Added value: +{
+  "items": {
+    "additionalProperties": {},
+    "type": "object"
+  },
+  "type": "array"
+}

addedInput schema / properties / paused
```
Added value: +{
+  "type": "boolean"
+}
```

addedInput schema / properties / push_notification_config

Added value: +{
+  "additionalProperties": {},
+  "type": "object"
+}

addedInput schema / properties / reporting_webhook

Added value: +{
+  "additionalProperties": {},
+  "type": "object"
+}

addedInput schema / properties / revision
```
Added value: +{
+  "type": "integer"
+}
```

addedInput schema / properties / start_time

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "const": "asap",
+      "type": "string"
+    }
+  ]
+}

changedInput schema / required

Previous value: -[
-  "media_buy_id",
-  "updates"
-]New value: +[
+  "media_buy_id"
+]

Changed1 schema field changedAug 4, 2026
- addedInput schema / properties / context
```
Added value: +{
+  "additionalProperties": {},
+  "type": "object"
+}
```

Changed1 schema field changedAug 3, 2026

addedInput schema / properties / packages

Added value: +{
+  "items": {
+    "additionalProperties": true,
+    "properties": {
+      "package_id": {
+        "maxLength": 100,
+        "minLength": 1,
+        "type": "string"
+      }
+    },
+    "required": [
+      "package_id"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

First observedMar 12, 2026

TDQS

A3.6/5.0

Behavior2/5

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It conveys that this is a mutation tool and lists use cases, but it does not explain merge semantics, whether updates are partial or full replacements, permission requirements, side effects, reversibility, or what the response contains.

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 well-structured with a clear summary, 'WHEN TO USE' bullets, and a concrete example. It is front-loaded, every section earns its place, and the example efficiently demonstrates the expected invocation shape.

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

Completeness2/5

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

This is a complex tool with 17 parameters, nested objects, no annotations, and no output schema. The description covers the core update flow well, but it leaves many parameter mechanisms unexplained (e.g., cancellation, idempotency, package changes, webhooks), making it incomplete for full correct invocation in all scenarios.

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 only 12%, so the description must compensate. It adds useful semantics by mapping to fields like status, budget, targeting, and dates, and the example clarifies the important `updates` object shape. However, many top-level parameters such as packages, paused, canceled, cancellation_reason, idempotency_key, and webhook settings remain unexplained.

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: "Update an existing media buy," and further specifies the modifiable dimensions: budget, targeting, schedule, or status. This clearly distinguishes it from creation and read tools such as create_media_buy and get_media_buys by emphasizing 'existing' and 'update.'

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 'WHEN TO USE' section provides concrete scenarios: adjusting budget mid-flight, pausing/resuming, changing targeting, and extending dates. It gives clear context for when the tool is appropriate, though it does not explicitly state when not to use it or name alternative tools.

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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