Add to set

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

Annotations already declare readOnlyHint=false and destructiveHint=false, so the safety profile is covered. The description usefully discloses the dual create/add behavior, which goes beyond the annotations, but says nothing about duplicate-track handling, name collisions, or permission requirements for a mutating, open-world tool.

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?

A single well-formed sentence with no filler, and the primary add-to-existing case is stated first with the alternative following. Nothing could be cut without losing 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 3-parameter mutation with no output schema and only hint-level annotations, this is the minimum viable description. Missing are the mutual-exclusivity/precedence rule, required permissions, and duplicate/error behavior an agent would want before calling.

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%, so the description must compensate; it does partially by giving semantic meaning to set_id and new_set_name (mutually exclusive alternatives). track_id and the exclusivity rule itself are left unstated, so coverage is incomplete rather than absent.

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?

Specific verb (adds) plus resource (track to a set), and it explicitly covers the second mode (creates a new set). This clearly distinguishes it from siblings like remove_from_set, delete_set, and edit_set without needing to open a schema.

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?

The parenthetical mapping shows which parameter triggers which mode (set_id = existing, new_set_name = new), which is implicit usage guidance. However, it never says what happens if both are supplied or neither, and it gives no exclusions or prerequisites (e.g. ownership of the set).

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