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

Annotations already establish that this is a non-read-only, non-destructive, closed-world mutation. The description adds only that the reminder belongs to the connected Jules account and does not explain partial-update behavior, what happens to unspecified fields, authorization needs, or other mutation semantics.

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 description is a single front-loaded sentence with no redundant or filler content. Its brevity leaves gaps in other dimensions, but as a conciseness and structure measure it is clean.

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?

This is a mutation tool with eight parameters, nuanced time/recurrence fields, and no output schema, yet the description does not clarify update semantics such as whether omitted fields are preserved or how timeExpression relates to scheduledAt. The fully described schema helps, but the description remains too thin for the tool's 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?

Schema description coverage is 100%, so all eight parameters, including required reminderId and optional fields, are documented in the schema. The description adds no parameter meaning beyond what the schema already provides, making the baseline 3 appropriate.

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?

The description uses a specific verb and resource: updating a reminder on the connected Jules account. It is clearly distinguishable from create/delete/list/get siblings by the verb, though it does not explicitly contrast alternatives.

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?

It gives no guidance on when to use this tool versus create_jules_reminder, prepare_jules_reminder, or other siblings, and no prerequisites or exclusions are stated. The intended action is only implied by the tool name and description.

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