Youngster: book a senior into a free tech-help session

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

Annotations cover the safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=false), and the description adds real traits on top: a consent prerequisite, the irreversibility of the booking through this tool, and the shape of the return. It doesn't address failure modes such as a slot already being taken, which is the one behavioural gap for a write operation.

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, zero padding, and the operation and its cardinality are front-loaded before the constraint and the redirect. Every sentence carries distinct information.

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?

With no output schema, the description usefully specifies the confirmation payload (booked: true plus venue, address, date and time), and it carries the consent and cancellation constraints. It stops short of error behaviour and does not point at list_sessions as the source of session_id/slot_id, though the schema does.

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 every one of the 8 parameters (including formats, patterns, and the senior_agreed constraint) is already documented in the schema. The description reinforces the consent rule and the one-senior/one-slot framing but adds no syntax or lookup detail beyond it, so baseline 3 applies.

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 with scope: 'Book one senior into one slot of a session.' It is unmistakably distinct from the read-only siblings find_venues and list_sessions, and the cardinality constraint (one senior, one slot) is stated up front.

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?

Gives an explicit precondition ('Only with the senior's agreement') and an explicit when-not with the alternative channel: bookings cannot be changed or cancelled here, call 1300 774 711 instead. Nothing about routing is left to inference.

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

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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so safety is covered. The description adds real behavioral context beyond that: result ordering (nearest first, or soonest sessions first when no place is supplied) and the fact that each venue carries its next session date.

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 tight sentences with zero filler. The core purpose leads, and the zero-argument fallback is appended where it is needed rather than buried.

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?

With no output schema, the description carries the return burden and does partially discharge it by stating each venue includes its next session date and that ordering is distance- or date-based. It stops short of describing the shape of the venue record or any pagination/limit behavior beyond the schema, but it is sufficient for correct invocation.

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 the parameters are already well documented, and the baseline is 3. The description adds only one piece of meaning beyond the schema — the behavior when no place is given, which explains why all four parameters are optional.

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 gives a specific verb and resource ("Find the Youngster venues"), disambiguates what a venue is ("libraries, community centres"), and scopes it geographically ("in Australia"). It distinguishes itself from list_sessions implicitly by returning venues with a single next session date rather than sessions themselves, but it never names the siblings to make the boundary explicit.

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 implied by the two modes described (with a place, or with no place), but the description never states when to reach for this tool over list_sessions or book_slot, nor any exclusions or prerequisites. The alternative inputs (latitude/longitude) are only documented in the schema, not surfaced as guidance here.

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

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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description earns credit for extra semantics not in the annotations: 'seats_left 0 is full' defines the fullness convention, and 'Times are local to the venue' resolves timezone ambiguity for returned timestamps.

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, with the core resource stated first and the two clarifying facts (fullness, timezone) trailing. Every clause carries information.

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?

With no output schema, the description correctly compensates by sketching the return shape (sessions containing slots with seats_left) and the timezone of the values. Minor omissions remain — result ordering, whether past/dated sessions are excluded by 'upcoming', and behavior when nothing matches.

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 the four parameters (venue_id, from_date, to_date, limit) are fully documented in the schema. The description adds nothing about parameter meaning or interaction (e.g. how from_date/to_date interact with 'upcoming'), leaving it at the baseline for fully-covered schemas.

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 (List) and resource (a venue's upcoming sessions) and even describes the nested payload — slots with seats_left. It does not, however, differentiate itself from the siblings book_slot or find_venues, so an agent gets no explicit contrast.

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?

There is no when-to-use guidance, no prerequisites (e.g. that venue_id comes from find_venues, which only appears in the schema), and no mention of the sibling book_slot as the action that follows a listing. Usage is only implicitly inferable from the word 'upcoming'.

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