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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety and locality are covered. The description adds only the boundary that no media is generated, and hints the payload includes release gates; it says nothing about ordering, volume, or whether routes are scoped to a workspace or account.

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, front-loaded with the resource and result content, followed by a single scoping disclaimer. Nothing is redundant and no sentence is padding.

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 read tool with no output schema, the description names both the entity returned and one notable field (release gates), which is enough to select and call it. It could say slightly more about what a 'route' is or the listing scope, but that is a minor gap at this complexity.

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 takes zero parameters, so there is no parameter semantics to mis-specify; baseline 4 applies. The description correctly implies an unfiltered, full listing rather than a parameterized query.

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 ('List') and resource ('video routes'), and adds what data comes back ('their current release gates'). The resource is clearly distinct from the only sibling, list_capabilities, though the description never names or contrasts that sibling.

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 line 'This does not generate media' pre-empts a plausible misread and implies this is a metadata-only read, which is a small piece of when-to-use guidance. There is no explicit statement of when to choose this over list_capabilities or what prerequisites (auth, scope) apply.

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