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

Annotations already declare readOnly, idempotent and non-destructive, so the safety profile is covered; the description adds the access-control requirement (a private organizer link is mandatory) and the timezone semantics for overdue/due-today items. These are real behavioral facts beyond the structured fields, with only return format left implicit.

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 use case before the mechanics, and no filler sentences. It runs slightly long as a dense paragraph, but each clause (trigger, prerequisite, return contents, side-effect disclaimer) contributes distinct information.

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 one-parameter read tool with an output schema and full annotation coverage, the description covers when to call, what is required, and what is returned at a high level. Nothing essential is missing, though scale behavior for very large checklists is unmentioned.

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% and the single parameter is already documented with a format example, so the schema carries the load. The description reinforces that the link is private and mandatory, but adds no new syntax or format detail beyond that framing.

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 read operation ('returns progress by section and by person') on a named resource, and anchors it to the sibling that creates the checklist ('made with create_shared_checklist'). The agent can distinguish this read tool from create/update without opening a schema.

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 explicit trigger conditions ('when the organizer asks how far along... what is overdue, who did what, or what is left') plus a hard prerequisite ('Do not use without the organizer link'). It signals the boundary by stating it does not change the checklist, though it never explicitly routes mutation requests to update_shared_checklist.

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