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

Annotations already declare readOnlyHint=false, destructiveHint=false and idempotentHint=true; the description adds real value on top by naming the mechanism (same idempotencyKey and input) and reassuring that the source is unchanged. It stops short of describing permissions, rate limits, or what the resulting copy looks like.

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?

Three short sentences, front-loaded with the core action and free of filler. The retry sentence leans toward boilerplate but earns its place given the required idempotencyKey parameter.

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 nested-body mutation with no output schema, the definition covers the mutation semantics and idempotency but omits the return value (e.g. whether the new template is returned with its id) and the default naming behavior when body is empty. An agent knows what the call does but not what it gets back.

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 only 33% — idempotencyKey is fully documented in the schema, while body.name and body.description carry no descriptions. The description does clarify that name and description are optional overrides, but it never explains that params.id identifies the source template to copy, leaving the key input under-specified.

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: "Creates a copy of a saved message sequence." The word "copy" implicitly distinguishes it from createSequenceTemplate and getSequenceTemplate, but neither sibling is named, so sibling differentiation is inferred rather than explicit.

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 "optionally with a new name and description" implies when to supply the body, and the idempotency sentence gives retry guidance. However, there is no explicit statement of when to duplicate versus create a new template from scratch, and no prerequisites or exclusions are given.

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