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

Annotations already provide readOnlyHint=false and destructiveHint=false. The description adds meaningful context by disclosing an auth-like requirement ('Requires the student’s email') and a cost constraint ('Free'). It also indicates that multiple output options are generated, which is useful beyond the structured annotations.

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 description is three short sentences with no filler. It front-loads the primary purpose, then lists constraints and the intended use case. Every sentence contributes useful information for tool selection and invocation.

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?

Given the tool's moderate complexity and the absence of an output schema, the description gives enough context: what it generates, what inputs matter, a required identity element, and when to use it. It could be slightly more explicit about optional parameters and the exact return format, but it remains adequately complete for an agent.

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 schema already documents all parameters well. The description adds only marginal clarity by grouping 'essay type' with its enum values and labeling 'stance' as optional, but it does not significantly expand on what the schema already provides.

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 clearly states a specific action ('Generate strong thesis statement options') and identifies the resource (thesis statement) plus the key inputs (topic, essay type, optional stance). It is immediately distinguishable from the sibling generate_study_plan because it targets essay thesis creation rather than study planning.

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 explicitly says 'Use it when a student needs a thesis or essay direction,' which gives clear when-to-use guidance. It does not explicitly name the sibling or state when not to use it, but the purpose is distinct enough that the use case is well understood.

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