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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered by structured data. The description adds only the workspace scoping phrase and nothing about pagination, result limits, or what a trigger record contains — no value beyond the annotations.

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?

The core sentence is short and front-loaded, which is fine, but the trailing 'Tools revision: d80f65c0.' is internal build metadata that consumes space without helping an agent decide or call correctly.

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?

An output schema exists, so return values needn't be explained, but for a listing tool the description is silent on pagination behavior, ordering, and the required identifier format for the mandated 'workspace' parameter. Given one required parameter with zero schema coverage, the definition leaves real gaps an agent would hit on first invocation.

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 carry the load for the single 'workspace' parameter, and it does not: it never says whether the value is a numeric workspace ID, a path, or a display name, nor how to obtain it (e.g. via gtm_list_workspaces). 'In a workspace' only restates the parameter's presence.

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 and resource ('List triggers') and scopes it to a workspace, which distinguishes it from gtm_list_tags, gtm_list_variables, and gtm_list_folders by resource type. It doesn't explicitly name a sibling or contrast with them, so it stops short of 5.

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?

There is no when-to-use guidance, no mention of alternatives such as gtm_list_version_headers or gtm_update_trigger, and no stated prerequisites for choosing this listing over inspecting a container or workspace first. The agent must infer usage from the name alone.

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