list_students

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

No annotations are provided, so the description carries the full burden. 'List' plus the return-content disclosure (names and emails) establishes this as a read, and the course_id provenance is useful. However, it says nothing about permissions, pagination, or what happens with an invalid course_id.

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?

Two short lines, front-loaded with the resource and return fields before the argument note. No wasted prose, though the 'Args:' block is slightly formal for a single parameter.

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 one-parameter read tool with no output schema and no annotations, the description covers the essentials: what it returns and where the argument comes from. Missing pagination/volume and error context keeps it from a 5.

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 0% — the schema only says 'Course Id'. The description compensates by identifying the argument's source ('Course id from list_courses'), which is real value beyond the schema. It does not describe the id's format or failure behavior, so not a 5.

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 resource and scope ('student roster for a course') and discloses the returned fields (names and emails), which distinguishes it from siblings like list_teachers or list_submissions. It does not explicitly name or contrast with those siblings, so it falls short of a 5.

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?

Usage is only implied: the tool is clearly for enumerating a course's students, and the note that course_id comes 'from list_courses' hints at the prerequisite call. There is no explicit when-to-use vs when-not-to-use guidance or named alternative.

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