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

No annotations are supplied, so the description carries the full disclosure burden. It does add a genuinely useful behavioral fact: results are restricted to rows carrying efactura submission/download indexes. However, it says nothing about ordering, pagination behavior beyond the schema, or the read-only/scope constraints an agent would want to confirm.

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?

Two sentences, front-loaded with the core purpose and followed by the one non-obvious qualification. Minimal waste, though the second sentence slightly restates the 'supplier invoices received' idea before adding the index detail.

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 simple zero-required-param list tool this is close to adequate, but with no annotations and no output schema the description would ideally state that it is a read-only operation and hint at what each returned record represents. The implicit-filter caveat is covered; the return shape and date-field semantics are not.

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 limit and both date bounds are already fully documented with defaults, max, and format. The description adds no additional filter semantics (e.g., which date field the range applies to — issue date vs. SPV receipt date), so baseline 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?

States a specific verb and resource plus the ingestion channel: 'List supplier invoices received via ANAF SPV (e-Factura)'. The second sentence clarifies the implicit filter, so the agent understands this is not a general supplier-invoice list. It does not explicitly differentiate itself from the nearby search_supplier_invoices / search_invoices siblings, which keeps it from 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?

Usage is implied — call this when you need invoices that arrived through the SPV channel — but there is no explicit when-to-use/when-not statement and no alternative tool is named. An agent must infer that search_supplier_invoices is the right pick for locally created supplier invoices.

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