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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds value by narrowing scope to workspace-wide enumeration and naming the channels returned, but discloses nothing about pagination, ordering, or volume limits for a list operation.

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 front-loaded sentence with no filler, immediately stating verb, resource, scope, and returned fields. Every clause earns its place.

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?

With an output schema present, annotations covering the safety profile, and a fully documented parameter, the description only needs to identify scope and purpose, which it does. It could be stronger by noting pagination or the sibling get-tool distinction, but nothing essential is missing.

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?

Only one parameter exists (the boilerplate 'context' analytics field), and schema description coverage is 100%, so the schema fully documents it. The description contributes no additional parameter meaning, which matches the baseline of 3 for high schema coverage.

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 (message templates) scoped to the workspace, plus the channel coverage and returned fields (slugs, channels). It implicitly contrasts with templates_get/templates_create/templates_regenerate by emphasizing 'all', but never names an alternative, so it falls just short of explicit sibling differentiation.

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 word 'all' implies an enumeration/browse use case, but the description gives no explicit when-to-use condition, no prerequisites, and no mention of templates_get for single-template retrieval. Usage is only inferable from the phrasing.

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