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

Annotations indicate readOnlyHint=false and destructiveHint=false, so the safety profile is already known. The description adds useful context beyond annotations: the email requirement and that it is free. It does not disclose the output format or precise behavior (e.g., whether it returns all five styles at once or requires external interaction), but the core generation behavior is predictable; no contradiction with 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 a compact three sentences with the core action front-loaded. The 'Free' clause is mildly redundant but not harmful. Every sentence earns its place: purpose, requirement, and when-to-use.

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?

For a tool with 11 parameters and no output schema, the description covers the main selection cues (what it does, when to use, email requirement) but omits what the returned citation looks like and whether all five styles are returned at once. The schema handles parameter meanings, but the description could be more complete about the output contract.

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 coverage is 100%, so the baseline is 3. The description adds only 'from the source type and details,' which maps to the schema's `type` and other fields, but it does not explain individual parameters or their relationships beyond the schema. It lists 'book, journal article, website' in the usage note, slightly reinforcing the `type` enum values, but no substantial additional meaning.

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 verb and resource: 'Generate a formatted citation for a source in five styles...' It also names the supported styles and source types, and clearly distinguishes from sibling tools (generate_study_plan, generate_thesis_statement), which serve different purposes. The title and description align with no ambiguity.

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?

Explicitly states when the tool should be used: 'Use it when a student needs to cite a book, journal article, website, or other source for an essay or paper.' It also gives a prerequisite (student email) and a condition (free). It does not explicitly contrast with alternatives, but the sibling tools are unrelated, so the use-case guidance is sufficient.

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