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

Annotations already declare destructiveHint=true and readOnlyHint=false, but the description adds no behavioral context whatsoever. It does not clarify whether the update is a partial merge or a full replace, what data may be lost, or whether omitted fields are preserved or reset — the single most important question for a destructive 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 single sentence is front-loaded and free of filler, so nothing is wasted. But at this length it is under-specified rather than concise, providing no structure to help an agent reason about the destructive update.

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 destructive mutation tool with a nested seven-field updates object, no output schema, and zero parameter documentation, the description is far too thin. An agent cannot determine update semantics or the shape of the expected payload from this definition alone.

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 description coverage is 0% and the nested updates object has seven undocumented sub-properties. The description only echoes the "by ID" semantics already implied by the required nineSliceId parameter and explains nothing about the updates payload, including whether partial updates are allowed.

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?

"Update a nine-slice by ID" names a specific verb and resource, so an agent knows the general operation. However, it says nothing about what aspects of a nine-slice can be updated (name, colors, part IDs, or border widths), and offers no differentiation from siblings like create_nineslice or get_nineslice beyond what the tool name already conveys.

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?

There is no guidance on when to use this tool versus create_nineslice or get_nineslice, no mention of prerequisites such as needing an existing ID, and no statement about what happens on failure. The agent must infer everything from the name.

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