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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds useful context about data provenance (Kapalıçarşı vs ECB/central bank reference), which goes beyond the annotations, but it says nothing about freshness guarantees, rate limits, or failure behavior for a live external feed.

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 core purpose is front-loaded, but the raw endpoint string 'GET /v1/doviz' and the trailing 'Her pakette' are noise that does not help an agent decide or invoke. The parenthetical is dense but informative.

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?

With only two optional parameters, full schema coverage, and annotations present, the definition is adequate but thin. It lacks guidance on defaults (tur defaults to anlik), output shape, and how it relates to the historical/conversion siblings, leaving gaps for an agent choosing among 27 tools.

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 schema already explains both 'kod' (comma-separated codes) and 'tur' (anlik vs referans with source semantics). The description adds no parameter-level meaning beyond that, so the baseline 3 applies.

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 names a specific resource (döviz kurları / exchange rates) and its unit (TRY karşılığı), plus the two data sources (anlık Kapalıçarşı vs merkez bankası referans). It does not explicitly differentiate itself from siblings like doviz_gecmis or cevir_doviz, 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?

There is no statement of when to use this tool versus doviz_gecmis (historical rates) or cevir_doviz (conversion), which are the obvious alternatives. The phrase 'Her pakette' ('in every package') is opaque and gives no actionable usage guidance.

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