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

Annotations already declare readOnlyHint, destructiveHint=false and closed-world scope, so the safety profile is covered. The description adds real value beyond that by disclosing the default filtering rule: completed tasks are omitted unless includeCompleted is true. It omits pagination/limit behavior, so it is not a 5.

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?

Two tight sentences, front-loaded with the core action and immediately followed by the one non-obvious default. No filler or repetition of the title.

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 read-only list tool with no output schema this is close, but with 25% schema coverage the description should at least note the limit/pagination behavior and that listId is sourced from list_google_task_lists. The includeCompleted rule is covered; the remaining gaps keep it at minimum viable.

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 only 25% (only mailbox is documented), so the description carries the burden. It explains includeCompleted's semantics but says nothing about limit, listId, or where listId comes from, leaving half the surface undocumented in both places.

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 and resource ('List the tasks in one list') and scopes it to a single list, which separates it from list_google_task_lists and get_google_task. It does not explicitly name those siblings or contrast with them, 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?

No when-to-use or when-not-to-use guidance is given; the agent is not told when to prefer this over get_google_task or list_outlook_tasks. The only implied routing is the completed-filter default, which is behavior, not usage guidance.

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