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

Adds real context beyond the annotations: it explains why the tool exists (the scoring engine only runs client-side, so the agent must do the analysis), and it names the non-obvious return keys (content, metadata, tests_to_run, kb_link) that the agent must use to proceed. The 'server marks it read-only, so it runs straight away' clause largely restates readOnlyHint/destructiveHint, which is mildly redundant but not harmful.

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?

Purpose is front-loaded in the first clause, and the three sentences stay dense with useful information. Minor waste in the trailing read-only sentence, which duplicates an annotation, and the embedded HTML entity is sloppy but harmless.

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 explaining returns, and it does so by naming content, metadata, tests_to_run, and kb_link plus how they are consumed. Combined with the read-only/idempotent annotations, an agent has everything needed to call this and interpret the result.

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% — post_id, keyword (override semantics), and the single-value site_id enum are all documented in the schema. The description adds no parameter-level detail beyond that, 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?

States a concrete verb and resource — gathers raw content, metadata, and the list of on-page SEO tests for a saved post — which is a distinct payload from siblings like get_post_seo_meta or get_seo_scores. It also explains the differentiator (client-side scoring engine) that separates it from a precomputed-scores tool, though it never names an alternative tool outright.

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?

Gives an explicit follow-on workflow: combine tests_to_run and content with kb_link (the rubric for all 24 tests) to score each test and emit a status and fix message. That is unusually actionable guidance. It stops short of an explicit exclusion (e.g. 'use get_seo_scores instead when you only need stored scores'), so not a 5.

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