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

Annotations already cover the safety profile (readOnly, non-destructive, closed-world), so credit goes to the added behavior: a 2,000-row cap, the actual allowed lookback windows (7/28/90/180/365/480), and that each row carries prior-period metrics plus a new/lost/rising/falling/flat label. That window list is genuinely important because the schema's `days` field advertises an unbounded integer range that would mislead an agent.

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 dense sentence, front-loaded with the verb, row cap and dimension choice, then the time windows, then the comparison semantics. No filler and no repetition of structured fields beyond what is needed to correct the schema.

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 usefully sketches the return shape (rows per dimension, previous-period metrics, status labels), which covers the main completeness burden. However, the nested `filter` object and `projectId` are left entirely unaddressed, so an agent has no guidance on how to narrow the 2,000-row result set.

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 0% across 4 parameters (one nested), so the description must compensate. It does explain `dimension` (the four row types) and constrains `days` to six values, but says nothing about the `filter` object (contains/not_contains/regex operators, 200-char value limit, 3-letter country pattern) or about `projectId`, leaving the most complex parameter undocumented.

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 (read) and a well-scoped resource: per-dimension Search Console rows (queries/pages/countries/devices) with previous-period metrics and status labels. The 'breakdown with previous period comparison and new/lost/rising/falling/flat marking' framing implicitly separates it from get_search_console_overview and get_search_console_trend, but no sibling is named explicitly.

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?

The description implies usage (you want per-dimension rows compared against the prior period) but never says when to pick this over get_search_console_report, get_search_console_trend or get_search_console_overview, nor any exclusions or prerequisites such as a connected property. Guidance is inferable rather than stated.

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