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

With no annotations, the description carries the full burden. It usefully discloses that the entry is kept in history, no longer counted, and that a running clock is stopped and voided, plus who can perform the action. However, it omits reversibility, error conditions, and whether approval state is enforced.

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?

The effect is front-loaded and the description is short. The final sentence is slightly fragmented ('The person, the owner or office can') and could be clearer, but there is little wasted text.

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?

An output schema exists, so return values need not be explained. For a mutation tool with no annotations, the description covers state effects and permissions but leaves gaps around parameter usage and edge cases, making it adequate but incomplete.

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 compensate for undocumented parameters, but it never mentions time_entry_id or reason. The parameter names are somewhat intuitive, but the description adds no semantic meaning beyond what the schema names already imply.

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 uses a specific verb and resource ('take back a time entry') and scopes it to entries 'never approved,' which distinguishes this from approval or reopening actions. It clearly conveys the operation, though it doesn't name sibling tools explicitly.

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 'never approved' gives an implied condition for use and implies that approved entries should not be voided, but the description does not explicitly compare this to timesheets_reopen or timesheets_decide. The permission sentence ('The person, the owner or office can') provides some role context but is grammatically incomplete.

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