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

Annotations already declare readOnlyHint=true and destructiveHint=false, so safety is covered; the description adds genuinely useful behavior beyond that by disclosing the data-source fallback (stored data when available, otherwise a live Google fetch), which explains freshness and possible latency. It does not describe failure behavior when neither source covers the window, and 'live from Google' sits slightly in tension with openWorldHint=false, so the picture is incomplete rather than wrong.

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 sentence, front-loaded with the resource and time window, with the storage/fallback clause trailing. Every clause carries information an agent needs; there is 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?

For a single-project, single-endpoint read with no output schema, the description covers scope, window and source, which is most of what an agent needs before calling. It stops short of describing the returned shape (weekly rows) or the error path when Google data is unavailable.

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% for the single parameter, so the schema itself documents projectId and the baseline applies. The description adds no format or scope detail beyond 'the Project's', which is fine but not additive.

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 names a specific verb (Read), a specific resource (last 13 weeks of clicks and impressions) and a precise scope (the Project's Search Console property), which is enough to separate it from siblings like get_search_console_overview or get_search_console_breakdown by time-series framing. It never names those siblings explicitly, so differentiation is inferred from the '13 weeks' window rather than stated.

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 deduce this is the time-series/trend view of Search Console data because of the fixed 13-week window. There is no explicit 'use this when you need X, use get_search_console_report when you need Y' guidance, and no stated prerequisites (e.g. that a Search Console connection must exist).

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