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

The description restates the read-only posture already carried by readOnlyHint=true, adding only the server-wide guarantee that no financial records are written. Genuinely useful additions are the upstream endpoint mapping (financial/transactions/getAll) and the field list, but pagination behavior for page/page_size is left entirely to the schema.

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?

Front-loaded with purpose, then the read-only assurance and API mapping as compact fragments. Roughly three clauses, none wasted, though the return-field enumeration slightly lengthens the first sentence.

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 no output schema, naming donor, date, method, batch and per-fund amounts usefully previews the return payload, and the annotations plus endpoint mapping round out the picture. Pagination semantics exist only in the schema, which is acceptable but keeps this from a 5.

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 the baseline is 3. The description maps start/end to 'between two dates' and category_id to 'optionally for one fund', but adds no format or semantics beyond what the schema already documents for page and page_size.

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 (list) and resource (giving transactions), plus the scope (between two dates, optionally one fund) and the fields returned. It does not explicitly name a sibling alternative such as elvanto_list_financial_categories, but the transaction-vs-fund distinction is inferable from the wording.

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 date range requirement and the optional fund filter imply when the tool applies, but there is no explicit when-to-use/when-not guidance or comparison to sibling list tools. The agent must infer that this is the reporting-style read path.

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