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

Annotations already declare destructiveHint=true and idempotentHint=true, so the safety profile is covered by structured data. The description adds nothing beyond that — it doesn't say the deletion is permanent, whether nested content is removed, or what happens if the id is unknown. A 3 reflects a description that neither contradicts nor enriches the annotations.

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?

A single six-word sentence with the verb and identifier front-loaded and zero filler. It is appropriately sized for the operation, though its terseness trades away information rather than being genuinely optimal.

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 one-parameter delete with no output schema, the bare mechanics are covered and annotations carry the destructive/idempotent profile. What's missing is behavioral fallout — whether the removal is recoverable and what an invalid or already-deleted id returns.

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?

One parameter with 0% schema description coverage, so the description is the only place meaning could be added. "By id" merely restates the schema property name and gives no format, source, or validity guidance for the id value.

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?

States a specific verb and resource ("Delete a tile") plus the identifying key ("by id"), which cleanly separates it from add_tile, update_tile and move_tile by operation type. It stops short of naming those siblings or contrasting scope, so it's clear but lacks explicit differentiation.

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 tool versus update_tile or move_tile, and no prerequisites or conditions. The agent must infer from the verb alone that this is the terminal removal path.

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