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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds genuine behavioral context on top: the response is point-scoped, it aggregates several data classes, and hunting detail is withheld unless a Camp Map Pass is held. It stops short of 5 because it says nothing about how current the data is or how it behaves on water/unresolvable points.

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?

One dense sentence, front-loaded with the primary purpose ('Land status at a point') followed by the returned data classes in a scannable list. Every clause carries information; only the trailing hunting/pass clause slightly dilutes the front-loading.

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?

With no output schema, the description must carry the return-value burden, and it largely does — it enumerates land classifications, camping rules, signal estimation, logging activity, road surface, and fire-ban pointers. Remaining gaps (freshness, behavior at invalid or marine coordinates) are minor for a read-only lookup.

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% — both lat and lng carry descriptions with WGS84 units and range constraints — so the schema does the heavy lifting. The description adds nothing about the coordinate parameters (e.g. precision expectations), so the baseline 3 applies.

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 states a specific resource ('land status at a point') and enumerates the concrete payload — camping rule, special areas, per-carrier signal, logging, nearest road surface, fire bans. That is far more specific than the bare tool name 'check_spot'. It does not, however, distinguish itself from near-siblings like find_spots or confirm_spot, so it stops short of a 5.

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?

Usage is only implied: an agent can infer this is for evaluating one known coordinate before camping. There is no explicit when-to-use statement and no mention of find_spots (discovery) or confirm_spot (commitment) as the alternatives. The one conditional given — hunting details require a Camp Map Pass — is a data-gating note rather than routing guidance.

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