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

With readOnlyHint=true already covering the safety profile, the description usefully discloses what is returned (boxes of filled cells with textures of their visible sides) in place of a missing output schema. It does not mention permissions or result size limits, but it adds real behavioral context beyond the annotation.

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?

Two short sentences with no filler. The result shape is front-loaded and the default-behavior note follows, though the wording ('textures of their showing sides') is slightly cryptic.

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 parameterless-required read tool with no output schema, the description covers the return shape and the default axes behavior, which is most of what an agent needs. The remaining gap is the lack of any statement distinguishing this from the sibling look tool.

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 both baselines at 3; however the description adds meaning the schema lacks - it explains that any omitted rows/columns/layers default to those around you across all layers, which is important since no parameters are required. This is genuine value beyond the schema's '[from, to], or [one]' 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 is a noun phrase describing the result ('boxes of filled cells, with textures of their showing sides') rather than stating a clear verb+resource action. Combined with the name look_blocks an agent can infer inspection of blocks, but the phrasing is vague and gives no differentiation from the sibling look tool.

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 statement of when to use this versus look, textures, or find_pictures, nor any prerequisites. The second sentence hints at behavior of omitted axes but that is a parameter default, not usage guidance.

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