create_session

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

With no annotations provided, the description carries the full burden and does well: it states that existing data is not modified/deleted, that invalid time ranges or >24h sessions are rejected with a 400 error, and that topic/notes are untrusted free text. This goes well beyond what the schema or tool name reveal.

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 four sentences, each earning its place: purpose, completion semantics, time constraints/errors, and security guidance on free-text fields. It is front-loaded and free of filler.

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 creation tool with 8 parameters and no annotations, the description covers safety, validation, and parameter semantics well. The main gap is the lack of context around the course-related required parameters, and no mention of permission requirements, but an output schema exists so return-value detail is not necessary.

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%, so the description must compensate. It does add meaning for is_completed, start/end_time, and topic/notes, but the required course_id, course_name, and course_color parameters are left unexplained beyond their self-evident names.

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 the tool's function: creating a new study session/calendar entry for a given course and time range. It distinguishes this from siblings like list_sessions and create_note by specifying the resource type and action.

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 gives clear guidance on when to set is_completed=True (logging past sessions) vs False (planned sessions), and it states constraints that prevent invalid input. It does not explicitly name alternatives, but the usage context is clear enough without needing exclusion statements.

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