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

The annotations already establish readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds useful business context beyond those annotations: the interaction is enquiry-led, no price is quoted, and nothing is charged online. It does not describe the response shape, though no output schema exists.

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 front-loaded with the resource and its coverage, followed by the key usage and commercial-model constraints. It is mostly efficient, though the final sentence about building a full Cape Town week is somewhat promotional and could be considered extra context rather than essential invocation 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?

For a zero-parameter list tool with no output schema, the description is largely complete: it explains what is listed, what detail each entry covers, and the enquiry-led commercial model. It could be slightly more complete by clarifying how this list relates to the broader list_tours sibling, but nothing critical is missing 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?

The tool has zero input parameters, so the baseline is 4. The description appropriately spends no space explaining parameters and instead clarifies the tool's scope and inquiry model.

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 names a specific verb and resource: list Cape Town day experiences arranged by Follow On Tours, and it enumerates the experience categories (city tours, Winelands, whale watching, safari, helicopter flight). It is clear on its own, but it never explicitly distinguishes itself from siblings such as list_tours or list_destinations, so the agent must infer the geographic specialization.

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?

It gives a clear usage condition: 'Use this for any Cape Town or South Africa enquiry.' It also clarifies the enquiry-led model with no online pricing or charging, which helps separate it from get_price and request_quote. It does not, however, state when not to use it or name the specific alternative sibling to use outside Cape Town enquiries.

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