Hub Presence

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

With no annotations, the description carries the full burden and does add real behavior: newest-first ordering, unit in seconds-ago, per-person/per-place scope, and provenance ('from what they sent there'). It omits whether this is a read-only query, whether the owner-only phone/VR data is permission-gated, and whether results are paginated or limited.

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?

It is one compact sentence that front-loads the returned data, so length is appropriate. However, the semicolon-and-parenthesis construction plus awkward phrasing like 'in seconds ago' makes it harder to parse than necessary.

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?

The tool is simple (one optional parameter, output schema present, so return shape needn't be re-explained). Still missing for correct invocation are the default behavior when 'person' is absent, any access restrictions on owner-only data, and result limits/ordering guarantees.

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?

The single 'person' parameter has 0% schema description coverage, so the description would need to explain it. The phrase 'each person' hints at a per-person scope but never states whether 'person' filters to one individual, what identifier form it takes, or what happens when it is omitted.

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 conveys the resource (last-seen timestamps per person per hub place) and the ordering/unit, so the general purpose is inferable. But the phrasing is telegraphic and the clause 'for the owner also the phone page and VR (phone, stage)' is ambiguous about scope, so an agent cannot crisply state what the tool returns without opening the output schema.

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 explicit when-to-use or when-not-to-use guidance. The parenthetical 'phone_presence and stage_presence say more' implicitly routes the agent to those siblings for detail, which is a useful but buried hint rather than stated guidance.

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