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

Annotations already declare destructiveHint=true, idempotentHint=true, readOnlyHint=false and openWorldHint=true, so the safety profile is fully covered by structured data. The description adds nothing beyond that – it does not say whether the deletion is permanent, what happens to derived data (keywords, rankings), or whether it requires ownership/permissions.

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 short sentence with the action front-loaded and zero filler. It is appropriately sized for a trivial single-parameter delete, though it is arguably too sparse to be a model of conciseness-with-substance.

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?

The tool is simple, annotations cover the destructive/idempotent profile, and the schema documents the only parameter, so the core is not missing. Still, for a destructive operation the description could note permanence or affected related data, leaving a modest gap.

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?

There is a single parameter and schema description coverage is 100%, so the schema already documents session_id fully. The description adds no format, source, or retrieval guidance beyond the schema, giving the baseline 3 for a fully-covered parameter.

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 ('Delete') and resource ('keyword research session'), so the agent knows exactly what the tool does. However it offers no differentiation from sibling deletions like delete_goal, delete_site, or delete_wordpress_site.

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?

There is no guidance on when to use this versus get_keyword_session/list_keyword_sessions or create_keyword_session. No prerequisites, no warning about irreversibility, and no indication of the selection condition that should trigger this tool.

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