ga4_update_display_video_360_advertiser_link

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

The description discloses that this is a write operation, explains the confirmation flag, and details the updateMask derivation. It does not contradict any annotations (none provided). It could add more about auth or side effects, but the given context is good for a mutation tool.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

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

The description is concise (three sentences) and front-loaded with the core purpose. Every sentence provides essential information without redundancy.

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

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

For a tool with 4 parameters, nested objects, and no output schema, the description covers the key behavioral aspects (update strategy, confirmation, field derivation). It could mention that the body is optional, but the schema already implies that.

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

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

Schema coverage is 100%, so baseline is 3. The description adds value by explaining the body parameter for nested fields and the updateMask derivation behavior, which goes beyond the schema's type descriptions.

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

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

The description clearly states the tool updates a DV360 advertiser link, specifies the resource type, and distinguishes itself from create and delete siblings via the '[GA4 WRITE]' prefix and the verb 'Update'.

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

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

The description explains the update mechanism (pass only fields to change, optional updateMask) and prerequisites (GA4_MCP_ENABLE_WRITES=true, confirm=true). However, it does not explicitly compare to sibling create/delete tools or state when to use this over alternatives.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.