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

Annotations already declare readOnly=false, idempotent=true, destructive=false and openWorld=false, so the mutation/safety profile is covered. The description adds nothing beyond that — it does not state that unspecified fields are left unchanged, nor any auth or side-effect details — so it neither contradicts nor enriches the annotations.

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 front-loaded sentence with no filler; each listed operation earns its place by telling the agent which fields are in play.

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 present, a fully documented 5-parameter input, and rich annotations, the description is adequate; the only mild gap is that partial-update semantics (omitting a field leaves it untouched) are left to inference.

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% and every parameter carries its own description, so the baseline is 3. The one sentence maps loosely onto title/remind_at/completed/clear_reminder, but adds no format, default, or interaction detail beyond what the schema already says.

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?

Specific verbs (renames, reschedules, ticks off, un-ticks) applied to a single resource ('one to-do'), which cleanly separates it from add_todo, delete_todo, and list_todos 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?

The enumerated operations imply the tool is for modifying an existing to-do, but there is no explicit when-to-use statement, no prerequisite mention (e.g. obtaining todo_id via list_todos), and no named alternative such as update_item vs add_todo.

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