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

Annotations already declare readOnlyHint=false, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds genuinely new behavioral context by stating that only changed fields need to be sent, which explains the partial-update contract that annotations do not convey. It does not disclose error behavior or whether omitted fields are preserved vs cleared.

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 action stated first and the submission rule second. Nothing in the text is redundant with the name or schema.

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?

This is a six-parameter mutation tool with 0% schema description coverage and no output schema. The description never enumerates the mutable fields, their expected formats, or what the response contains, so the agent lacks what it needs to populate the schema confidently. Only the partial-update rule is conveyed.

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% across 6 parameters, so the description carries the full burden and largely fails: it never names or explains name, event_time, description, rsvp_deadline, event_location, or the required list_id. 'Trimite doar câmpurile de schimbat' tells the agent how to submit parameters but not what any of them mean or what formats (e.g., date/time strings) are expected.

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 ('Actualizează o listă de cadouri existentă'), making the operation immediately identifiable. It does not, however, distinguish this tool from sibling update tools such as update_gift or update_my_reservation, and the 'existing list' qualifier is the only scoping cue.

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?

'Trimite doar câmpurile de schimbat' gives useful how-to-use guidance (partial update semantics), implying the agent should omit unchanged fields. There is no statement of when to prefer this over update_gift, nor any preconditions such as required permissions or list ownership.

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