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

Annotations already declare readOnly, idempotent, non-destructive behavior, so the bar is lower; the description still adds real context: the 31-day window cap, the default of today, and that flagged tickets mark missing time entries. It does not cover pagination or result ordering, 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?

Three dense sentences: what is returned first, then the practical use case, then the range limit. No filler, and the most important scoping fact (day by day, default today) is front-loaded.

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 zero-required-parameter read-only tool with full schema coverage and no output schema, the description covers contents, defaults, limits and purpose. It leaves the exact shape of the 'excerpt' and of the booked-minutes aggregate unspecified, which is a minor but real gap.

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 100%, so both date parameters are documented in the schema, but the description adds the constraint that at most 31 days can be requested at once — a limit absent from the schema itself. The default-to-today behavior is already in the schema, so it adds no extra credit.

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 states a specific resource and enumerates its contents precisely: tickets created, commented on (with excerpt), fields changed, closed/reopened, and minutes booked, scoped day by day. This enumeration makes it distinguishable from siblings like my_week or my_tickets even though no sibling is named.

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?

It gives a concrete use case — 'The ground for filling in forgotten time' — and explains the flag for tickets with activity but no booked time, which tells the agent when this tool is the right call. It stops short of naming alternatives such as list_time_entries or my_week, and gives no when-not guidance.

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