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

Annotations already declare readOnlyHint=false and destructiveHint=false, so the agent knows this is a non-destructive write. The description adds genuine context beyond that - it is 'Free' and it 'Answers the presenter's id' - but says nothing about idempotency, whether an existing presenter is replaced, or permissions.

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?

Three short sentences, front-loaded with the action, and each sentence contributes something (purpose, return value, cost). The second sentence's clause 'for presenters in the other tools' is a bit tangled but nothing is padded.

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?

There is no output schema, yet the description covers the return ('Answers the presenter's id'), the cost ('Free'), and the effect, while annotations handle the safety profile and the schema fully documents the inputs. Only finer write semantics are absent.

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 all three params (id, voice, picture) are already documented in the schema, which the description merely mirrors ('one picture', 'the voice the person chose'). Baseline 3 applies since the schema carries the semantics.

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 and resource: keep a picture of a drawing as one of the team's presenters, with the chosen voice. The phrasing ('one picture of a drawing', 'team's presenters') is slightly awkward but an agent can tell this registers a presenter, distinct from list_presenters/describe_presenter. It could name the relevant sibling more explicitly.

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: 'Answers the presenter's id, for presenters in the other tools' suggests this is the creation step whose output other tools consume, and the id param points at describe_presenter. There is no explicit when-to-use or when-not vs set_presenter_voice or list_presenters.

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