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

Annotations already declare readOnlyHint, idempotentHint and non-destructive, so "Read-only" is redundant rather than additive. The description does add real context beyond annotations: "One page at a time" discloses pagination behavior and "with a chart" hints at the response shape, though it never states ordering, page limits, or what happens when the range is empty.

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, front-loaded with the use trigger and the returned fields. The trailing "Read-only" duplicates the annotation and could be dropped, but there is otherwise 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?

With no output schema, the description must carry the return shape, and it only gestures at it (time, code, country, device, chart) without saying whether results are sorted, whether the chart is a URL or a series, or how pagination end is signalled. Adequate for a read-only list tool, but an agent calling it still learns basic behavior only from trial.

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%, so page, per_page, start_date, end_date and idproject are fully described in the schema and need no restating. The only description-side hint is "one page at a time", which reinforces pagination but adds no syntax or defaulting guidance. Baseline 3 applies when the schema carries the semantic load.

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?

Names a specific verb and resource ("scan log for a project") and lists what the log contains (time, code, country, device, chart). It does not distinguish itself from the many sibling scan tools (get_qrcode_scans, get_account_scans, get_scans_by_country, get_scans_by_date), so an agent must infer the boundary from the name alone.

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?

"Use this when the user wants the scan log for a project" gives an implied trigger, but there are no explicit exclusions or named alternatives despite a crowded set of scan-related siblings. It suggests scope (project-level) without ruling out the per-QR-code or per-account variants.

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