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

Annotations declare readOnlyHint=true, yet the description explicitly offers add, complete and delete operations on tasks that 'persist between sessions' — a state-mutating write tool. This is a direct contradiction of the annotation, so per the rules this scores 1 regardless of the otherwise useful details (persistence, reminder callback, per-call cost).

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?

Three dense sentences, front-loaded with the core purpose and capability set, then persistence/privacy and cost. No filler, though the pricing sentence is somewhat tacked on.

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 7 parameters, no output schema, and only 57% schema coverage, the description covers the high-level behavior (persistence, reminders, privacy, cost) but omits how to filter by status, the reopen lifecycle, and the role of id/notes. Adequate but with clear gaps for a multi-action 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 description coverage is 57%, so the schema documents some fields (due as ISO date-time, remind_url as an https URL, action enum, status enum). The description adds meaning for due dates and the reminder callback, but never mentions the reopen action, the id field, notes, or the status filter, so it only partially compensates.

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 names a concrete resource (agent task list) and enumerates the operations (add, list, complete, delete), so an agent immediately knows what the tool does. It does not, however, distinguish itself from near-neighbors such as memory, schedule, or plan, so it stops short of a 5.

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 useful context for choosing the tool (tasks persist between sessions, are private to the paying wallet, cost $0.002/call), which implies when it is appropriate. But there is no explicit when-to-use vs. alternatives such as memory or calendar/schedule tools, and no stated exclusions.

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