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

Annotations already declare readOnlyHint=false and destructiveHint=true; the description adds the genuinely useful nuance that the call only stages a proposal rather than performing the mutation immediately. It stops short of saying what the proposal does, who/what confirms it, or how it interacts with the destructive flag.

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 very short sentences, with the propose-only constraint front-loaded right after the action. The second sentence restates the first rather than adding information, which is mild redundancy but serves as emphasis in a tiny payload.

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 mutation-shaped tool with a required, undocumented identifier and no output schema, the definition leaves open what happens after the proposal, whether confirmation is needed, and error cases such as a routine not scheduled today. The annotations and the propose-only note cover part of the gap, but not all of it.

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% and the undescribed parameter is the critical one: routine_id has no description anywhere, so the agent gets no guidance on whether it must reference an existing routine or one scheduled for today. The description adds no parameter meaning at all, and additional_information's nested-object behavior is left to the schema.

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 pairs a specific verb ('marking ... done') with a precise resource ('today's instance of a recurring routine'), so the agent knows exactly what is affected. It does not name or differentiate against the obvious sibling skip_routine_today or complete_micro_action, so it falls 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?

'Proposes only' implies this belongs to a propose-then-confirm flow, which hints at when to use it. But there is no explicit when-not guidance and no mention of skip_routine_today for the opposite outcome or of confirm_change/discard_change for completing the proposal, leaving the agent to infer routing.

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