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

Annotations already flag destructiveHint=true and idempotentHint=true, which is unusual for an update tool and raises a real question the description ignores: is this a partial patch or a full replacement that wipes unspecified fields? Nothing is said about validation failures, permission requirements, or irreversibility. The one-line description leaves the behavioral burden entirely on 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 parenthetical sentence that is front-loaded and wastes no words. Brevity here edges toward under-specification rather than verbosity, but structurally it is clean.

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?

Seven parameters, 0% schema coverage, no output schema, and a destructive annotation make this a case where the description must do more. It should state what happens to unspecified fields and what a successful update returns or confirms, and it does neither.

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 0%, so the description must carry the semantics, and it only names five of the seven fields. It adds nothing about entryId being required, dosageUnit's relationship to dosage, that scheduledTime is HH:MM or nullable, or whether omitted fields are left unchanged. Field listing without meaning is largely a restatement of the schema keys.

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 ('Change') and resource ('a schedule entry') plus the fields it touches, so an agent can tell it modifies an existing entry rather than creating or removing one. It never names stackwell_add_schedule_entry or stackwell_remove_schedule_entry as alternatives, so the sibling differentiation is implied by the verb rather than stated.

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 guidance on when to use this versus add/remove schedule entry, no mention that the entry must already exist, and no prerequisites. The only signal an agent gets is the word 'Change', which is inference rather than instruction.

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