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

Annotations already declare idempotentHint=true, destructiveHint=false, and readOnlyHint=false, so the safety profile is covered. The description adds one genuine behavioral constraint beyond the annotations — that only stopped entries are editable — but omits conflict behavior (e.g., note vs clear_note together) and any permission context.

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 zero filler that states purpose and scope immediately. Nothing to trim and nothing buried.

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 small mutation tool with an output schema and informative annotations, the description is minimally sufficient. It does not address the note/clear_note interaction, permissions, or sibling routing, leaving gaps the annotations cannot fill.

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%, so all four parameters (note, minutes, entry_id, clear_note) are already documented in the schema. The description names 'length or note' but does not clarify clear_note or precedence rules, so it adds no meaning beyond the schema baseline.

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+resource ('Fixes the length or note') applied to a scoped object ('one of your stopped entries'). The 'stopped entries' qualifier implicitly separates it from log_time and start_timer/stop_timer, but no sibling is named explicitly, 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?

The phrase 'stopped entries' weakly implies you may only edit already-completed entries, but there is no explicit when-to-use/when-not guidance and no mention of alternatives such as log_time or delete_time_entry. An agent gets no routing help.

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