createMarimekkoPlaceholderSlide

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

With no annotations, the description must fully disclose behavior, but it only says 'Create or update' without explaining how update works, what happens on success, or any side effects. The `_index` parameter's behavior is described in the schema, not the description. The description fails to provide behavioral context beyond the generic statement.

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 a single sentence, making it concise. However, it is too brief to be effective, omitting important details. It is not wasteful but under-informative, which reduces its overall value.

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?

Given the tool's complexity (3 parameters, many siblings, no annotations, no output schema), the description is highly incomplete. It does not explain what a Marimekko chart placeholder is, the purpose of each parameter, or the update behavior. The bare minimum is stated, but critical context is missing.

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?

The description does not reference any parameters, so it adds no meaning beyond the input schema. The schema covers 33% of parameters with descriptions (only _index), but the tool description omits explaining what 'title' or 'categories' mean in the context of a Marimekko chart. This leaves the agent uninformed about critical required parameters.

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 'Create or update a Marimekko chart placeholder' clearly states the verb (create/update) and resource (Marimekko chart placeholder). It distinguishes from sibling tools like createHeatmapPlaceholderSlide, though this is mostly achieved by the tool name itself rather than the description. The purpose is clear but lacks additional context.

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?

No guidance is provided on when to use this tool versus its many siblings (e.g., createHeatmapPlaceholderSlide, createBubbleChartPlaceholderSlide). There is no mention of prerequisites, use cases, or when to create vs update. The description is too brief to offer any usage direction.

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