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

readOnlyHint=true already tells the agent this is a safe read, and the description adds nothing beyond that except the raw API endpoint. It does not state what happens when year/month are omitted (all parameters are optional), nor whether a default period is applied, nor anything about the shape or timeliness of the figures.

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 short sentences, with the substantive content (which metrics) front-loaded. The trailing API endpoint reference is mildly useful for API-aware agents but is the least essential of the two sentences.

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?

There is no output schema, so the description partially compensates by listing the returned metrics, which is helpful. However, for a tool whose two parameters are both optional, the description never says what period is used by default or whether both must be supplied together — a meaningful gap for correct invocation.

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 both parameters (year, month with a 1-12 pattern) are already documented there, so the baseline of 3 applies. The description's 'for a month' reinforces the period semantics but adds no format, default, or behavior detail beyond the schema.

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 the specific resource (executive summary) and enumerates the metrics it returns — revenue, cost, cash, receivables — for a stated granularity (a month). It is clear it aggregates financials, separating it from the transactional siblings like kledo_list_invoices, though it does not explicitly differentiate itself from the other kledo_report_* tools.

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 only implied: 'for a month' signals the expected period granularity. There is no statement of when to pick this over kledo_report_profit_loss, kledo_report_cash_flow, or kledo_report_balance_sheet, which cover overlapping financials, and no prerequisites or exclusions are given.

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