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

Given the annotations are all false and provide little safety signal, the description usefully discloses that it 'writes no expense,' which prevents the agent from assuming this journals or posts. It also specifies the returned components. It could add more about required permissions or whether anything else is mutated, but the core behavioral ambiguity is addressed.

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 description is compact and front-loads the purpose before listing output details. 'It writes no expense' is valuable clarification. The stray 'Pro.' at the end is unexplained and low-value, which prevents a 5.

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 tool with no output schema, the description conveys the main return shape: debit/credit journal entries, per-asset and total figures, and a currency-specific expense_add-ready payload. It does not detail the exact response structure, but the essential decision-making information is present. The unexplained 'Pro.' adds minor noise.

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 parameters are already documented in the input schema. The description adds general output context but does not explain month, scheme, project, category, or account parameters beyond what the schema provides. 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?

The description opens with a specific verb and resource: 'Return the depreciation journal for one month.' It also names the exact accounting entries (debit depreciation expense, credit accumulated depreciation) and the output granularity (per asset, in total, expense_add-ready payload). This clearly distinguishes it from siblings like asset_delete or asset_dispose.

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 description implies when to use the tool: to get a depreciation journal without posting an expense, reinforced by 'It writes no expense.' However, it does not explicitly name alternatives or state when not to use this tool, leaving the routing decision mostly to inference from the title and sibling names.

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