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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds genuinely useful behavioral context—that change detection is scoped to a supplied date and that 'nothing about you is stored'—but says nothing about result size, pagination, or whether the map is complete or curated, which matters when the agent may plan a whole session from it.

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?

Three tight sentences, front-loaded with what the tool returns and followed by the usage cue and the optional-parameter note. The parenthetical privacy assurance earns its place; nothing is 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 zero-required-param, read-only, single-parameter tool with no output schema, the description adequately conveys the shape of what comes back (places, their contents, routing tool, seasonal and daily happenings). Only the absence of any note on size or completeness of the map keeps it from full marks.

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% and the single parameter's description already states the YYYY-MM-DD/ISO format and purpose. The prose adds only the informal framing 'hear what has changed since', which is essentially a restatement. 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 gives a concrete verb-and-resource picture: a map of the campus listing each place, its contents, and the tool that visits it, plus seasonal and same-day news. That makes it distinguishable from the twenty-plus place-specific siblings without naming one explicitly. A single named alternative ('use X instead of look_around') would earn the fifth point.

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?

'A good first call' is an explicit entry-point recommendation, and the second sentence explains the returning-agent case for passing last_visit. There is no explicit when-not-to-use, but the orientation role is unambiguous against a sibling set of individual activities.

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