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

Annotations already declare readOnlyHint=false, destructiveHint=false and openWorldHint=true, but the description goes well beyond them: it discloses that nothing is sent to the guest, that the action is reversible via set_event_status lost, that automated Lead-stage emails may still fire, and that a Cotlet API key with app access is required. That is strong side-effect and auth transparency.

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 conveys the essentials, but repeats the same idea twice ('Nothing is sent to the guest' and 'It sends nothing to the guest') and pads with an explanatory aside about the Lead status. It is over-long relative to its information content.

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, and the description covers creation semantics, recipient safety, reversibility, and auth prerequisites, which is close to complete for a write tool. Minor gap: no mention of what happens if required fields like first_name/email are missing or how the response identifies the created event.

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 parameter is already documented in the schema. The description mentions the fields being supplied (contact, date, time, guest count, spaces) but adds no format, ordering, or constraint detail beyond what the schema states, so the 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?

The description states a specific verb and resource ('Adds an event in the Lead status ... with the contact, date, time, guest count and spaces'), which is concrete enough to distinguish it from siblings like set_event_status or update_event. The opening fragment 'New inquiry in the Lead status with its contact' is slightly indirect, but the intent is unambiguous.

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 useful operating context ('runs without asking first' and that it's the default status for contact-form inquiries) but never names an alternative tool or the conditions that select between, e.g., this and update_event or create via other paths. Guidance is implied rather than explicit.

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