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

Adds substantial context beyond annotations: exactly one email, sent once, on the morning of the chosen day in the receiver's time zone; suppressed if the underlying item is done/answered/closed by then; rescheduling replaces the pending reminder rather than duplicating; permissions are anyone-who-can-open-it; agents receive no email. One nuance worth noting is the tension between idempotentHint=false and the create-or-move semantics described, but the description discloses the actual replacement behavior explicitly, so an agent is not misled.

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?

Front-loaded with the core purpose, but it is a single sprawling paragraph that packs listing mode, permissions, rescheduling, cancel, and due-date follow behavior into undifferentiated prose. Nothing is wasted, yet the lack of structure makes the agent work to parse it.

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 available and full annotation coverage, the description covers capability, permissions, suppression rules, rescheduling, cancellation, and the list mode. It is complete enough to call correctly, though the list-mode behavior is buried at the end rather than surfaced early.

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 coverage is 100%, so baseline is 3, and the description still adds meaning: days_before_due is described as following a moving due date, about accepts document addresses for handed-out parts, and defaults for who and project are explained. Some params (on, line, cancel) are only restated at the level the schema already provides.

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?

Opens with a specific verb+resource ("Reminds or nudges someone ... sets a reminder email, or lists the reminders") and scopes it to project members, so the two modes are distinguishable. It is distinguishable from siblings like add_note or ask_for, though it never names them explicitly, and the dense run-on prose makes the core purpose slower to extract than it should be.

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?

Gives concrete mode-switching rules: "With no about, who or line, it lists the reminders still to go," "with cancel, it is taken back," and the reschedule behavior when setting the same about/who again. It also states who may set reminders for whom and that agents get no email. It stops short of naming an alternative sibling tool to use instead for any case.

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