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

Annotations already declare this is a non-read-only, non-idempotent, non-destructive mutation, so the safety profile is covered. The description adds one genuinely useful behavioral fact: expectedSpecVersion exists to prevent stale writes, implying optimistic concurrency. It does not say what happens when the version mismatches, whether the call is rejected or overwrites, or what permissions are required.

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, the core action front-loaded and the concurrency requirement immediately after. Every sentence earns its place with no filler.

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 nested-object mutation with no output schema, the description covers the action and the concurrency guard but omits conflict/error behavior, permission requirements, and whether default zoom bounds apply when minZoom/maxZoom are omitted. Adequate for a simple setter, but gaps remain.

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?

Nested schema fields (title, layerId, minZoom, maxZoom) carry their own descriptions and defaults, but top-level projectId and expectedSpecVersion have no schema description, and reported coverage is 0%. The description compensates only for expectedSpecVersion, explaining its stale-write role, and says nothing about projectId or the semantics of omitting minZoom/maxZoom.

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 ('Set a layer's minimum and maximum visible zoom levels'), which is precise enough to distinguish it from siblings like set_layer_visibility, set_layer_filter, and update_layer_style. It stops short of naming those siblings explicitly, so an agent must infer the boundary itself.

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 the neighboring layer-configuration tools, and no preconditions beyond the implicit expectedSpecVersion note. The agent must infer usage context entirely from the name and sibling list.

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