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

Annotations already declare the safety profile (not read-only, not destructive, open world), so the bar is lower. The description still adds real side-effect context: it fetches the live page, saves the before-score and a 28-day GSC baseline, creates the brief draft, and clarifies the actual post write happens later via publish_content_brief — consistent with readOnlyHint=false.

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?

The core directive is front-loaded in caps, followed by dense but relevant pipeline detail. It is long and clause-heavy, but for a complex orchestration tool most sentences carry functional information; some phrasing (author_draft/draft/front-matter) is packed tightly.

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 still explains what comes back (optimisation guidance with specific actions like keeping the URL, fixing title/meta on CTR lag, adding H2s) and how outcomes are read (uplift against the saved baseline). For a complex tool this covers what an agent needs to invoke and interpret it.

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 the baseline is 3. The description goes beyond it by explaining how the derived target is chosen (striking-distance GSC queries, positions 4–20, most impressions first) and that target_keyword overrides it, giving useful semantics for that field despite the schema already documenting it.

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 opens with a specific directive ('OPTIMISE A PAGE THAT ALREADY EXISTS') and scopes it to 'an existing blog or page', distinguishing it from new-content tools in the sibling set. It names the concrete resource (a live page) and the downstream action (publish_content_brief updates in place). An agent can identify the verb+resource without opening the schema.

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?

It states a clear trigger — 'start here when the user wants an existing blog or page improved' — and gives the override escape hatch ('override with target_keyword'). It does not explicitly exclude the new-content alternative or name which sibling handles that case, so guidance is strong but not fully bounded.

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