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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=false, so the agent knows this is a non-destructive, local write. The description adds the ownership dimension (connected user vs an editable team), which is genuinely useful behavioral context, but says nothing about auth requirements, validation failures, or what constitutes an "editable" team.

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 tight sentence with the create action front-loaded and no filler. It is efficient, though the brevity is partly under-specification rather than pure conciseness.

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?

Six parameters with zero schema descriptions and only venue marked required, plus a personal-vs-team ownership switch, is a lot of unexplained surface for one sentence. An output schema exists so return values need no explanation, but field meaning and the teamId condition are absent, leaving the agent under-equipped to call it correctly.

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 schema carries no meaning and the description must compensate — it does not. Nothing explains venue vs city vs region vs country/countryCode, nor whether teamId is required for the team case or what it accepts; the only weak hint is the incidental mention of "an editable team" alongside teamId.

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+resource ("Create a custom track") that is immediately distinguishable from the sibling update_, delete_, get_, and list_custom_tracks tools. It also adds scope ("for the connected user or an editable team"), which sharpens what the resource is. It stops short of naming which sibling to use instead for other operations.

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 phrase "for the connected user or an editable team" implicitly tells the agent this is the creation path for a personal or team-owned track, contrasting with update/delete siblings. But there is no explicit when-to-use, no precondition (e.g. team must be editable by you), and no guidance on when to omit teamId.

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