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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered. The description adds only that the result is a single report, with no mention of pagination, report freshness, or what happens when the id is unknown. Acceptable but not additive.

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?

A single front-loaded sentence with no filler; the lookup mechanism is stated first. It is arguably too terse to carry usage guidance, but nothing in it is wasted.

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 simple read-only tool with complete annotations, a 100%-covered schema and no output schema, the description is minimally sufficient. It omits the sibling differentiation (history vs current weekly report) that would help an agent pick correctly.

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 description coverage is 100%, so 'id', 'lang' and 'report' are already documented in the schema. The description only echoes the id-based lookup and adds no syntax, format, or constraint detail beyond that.

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 ('Read one weekly report of a site's history') and the lookup key ('by its id'), which is enough to distinguish it from sibling 'weekly_site_report' (the current report) and 'save_weekly_site_report'. It does not explicitly name or contrast those siblings, so it falls short of 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?

No when-to-use guidance, no preconditions, and no reference to the obvious alternatives in the sibling list such as 'weekly_site_report' or 'save_weekly_site_report'. The agent must infer that this retrieves an archived report rather than the current one.

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