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

Annotations declare destructiveHint=true, and the description reinforces this with 'or replace', making clear existing page content can be overwritten. It adds valuable context the annotations lack: capacity limits (40 pages of 2000 chars) and the side effect that remind_at surfaces the page in 'resume' when due. Auth/permission behavior is still unstated.

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 dense sentence; the core action is front-loaded and each clause carries information. Grammar is slightly compressed ('remind_at lists it in resume when due'), but there is no filler.

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?

Covers the destructive replace behavior, capacity limits, and the remind_at side effect despite having no output schema. Still missing any treatment of idempotency_key semantics or auth/permission requirements for a write operation on a 4-parameter tool.

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 50%: key and remind_at are documented in-schema. The description adds semantic meaning for remind_at by tying it to the resume listing, which goes beyond the schema's bare timestamp example, but it says nothing about the undocumented 'text' and 'idempotency_key' parameters.

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 pair (write/replace) and resource (notebook page), plus concrete structural facts (40 pages, 2000 characters). It does not, however, distinguish itself from the sibling 'notebook' tool or explain the relationship, so the agent must infer that this is the write counterpart.

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?

'Write or replace' implies the create/overwrite use case, and the remind_at clause hints at deferred resurfacing via 'resume'. But there is no explicit when-to-use versus when-not, no mention of how this relates to the 'notebook' sibling, and no prerequisites stated.

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