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

Annotations already declare readOnly, idempotent, non-destructive and open-world, so the safety profile is covered; the description adds genuine value by disclosing data redaction — no livestream URLs, passwords or private notes are returned. That matters for an agent deciding whether this call is sufficient for a given question. It does not mention error behavior for a missing/invalid event key.

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 sentences, zero filler, and the scope statement ('Read one scheduled event') is front-loaded before the return/exclusion detail. Nothing is redundant with the title or annotations.

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 simple single-record read with rich annotations and no output schema, the description covers purpose and the notable exclusions in the returned data. The only real gap is what form the 'scheduleEvent' argument takes, which is left entirely to the schema.

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 single required parameter 'scheduleEvent' carries only a regex pattern and length bounds with no explanation. The description never states that the parameter is the event identifier (ID vs. slug vs. name), so the agent must guess the expected input format.

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 ('Read') and resource ('one scheduled event') plus the payload contents (capacities, assigned teachers), which distinguishes a single-record fetch from the list-style siblings like fitssey_get_schedule and fitssey_list_classes. It does not explicitly name a sibling to disambiguate against, so it stops 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?

The word 'one' implies this is the per-record lookup used when a single event identifier is already known, but there is no explicit when-to-use vs. fitssey_get_schedule, and no stated preconditions. Usage is inferable rather than guided.

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