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

Annotations already declare readOnly/idempotent/non-destructive and closed-world, so the safety profile is covered and the bar is lower. The description adds genuine value beyond them by disclosing the content of the response, a level/stage snapshot plus next-level requirements and a cadence recommendation, which is not derivable from the structured fields because there is no output schema.

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 the resource named first and the payload contents listed after; every clause carries information. The parenthetical list is dense but each item maps to real returned data, so nothing is padding.

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 carries the burden of describing the return value and does so concretely, which is sufficient for a read-only, zero-required-parameter lookup. It stops short of stating what 'level' values look like or whether any prerequisites (e.g. connected Search Console) change the output.

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?

Only one parameter, and its schema description is already at 100% coverage, including the 'optional when the account has one project' fallback. The description adds nothing about project_id, so the baseline 3 applies.

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 resource, the SEO Progress ladder, and enumerates its parts (current level/stage, next-level requirements, recommended cadence), so an agent knows exactly what comes back. It lacks any explicit verb and does not distinguish it from neighbours like analyze_seo or get_plan_status, which leaves the sibling-differentiation half of the criterion unmet.

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: a 'get' of progress data suggests a read-only status check, but the description never says when to call this versus analyze_seo (diagnosis) or get_plan_status (remediation plan). No exclusion or alternative is named.

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