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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and external-data behavior are covered. The description adds no behavioral context whatsoever — not what a holiday entry looks like, whether the list spans the whole year, or whether the underlying service is rate-limited. "Her pakette" is unexplained and contributes no usable signal.

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 definition is short and front-loaded, but the second line — a raw HTTP path plus the cryptic "Her pakette" — does not earn its place for an agent and should have been replaced by a sentence describing the returned data.

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?

This is a simple read-only tool with one optional parameter, yet with no output schema the description must explain what the tool returns, and it does not. An agent cannot tell whether the result is a list of dates, names, day-of-week, or holiday type, which leaves the definition incomplete for its complexity.

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% and the single `yil` parameter is documented in-schema, including the default of the current year. The description adds nothing about the parameter, but with full schema coverage the baseline of 3 is appropriate.

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 is essentially the title restated: "Resmî tatiller ve dini bayramlar" adds no verb and no scope beyond what the name and title already say. The only extra content is the raw endpoint string `GET /v1/takvim/tatiller`, which tells an agent nothing about what the response contains or how this differs from the sibling takvim_gun.

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?

There is no when-to-use guidance whatsoever — no mention of choosing this over takvim_gun, no note that the year defaults to the current year, no prerequisites. The fragment "Her pakette" is opaque and does not function as guidance.

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