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

Annotations already declare readOnlyHint=true, destructiveHint=false, openWorldHint=false, so the safety profile is covered. The description adds real behavioral context: the date range is mandatory and the response is scoped to the report only (no unreconciled-data or multicurrency flags), which is beyond what the annotations say. It stops short of describing result shape or size.

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?

Four short sentences, front-loaded with what the tool does before the routing rules. No filler; each sentence either defines the output scope or routes to a specific alternative.

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 3-param, read-only report tool with no output schema and full annotation coverage, this is nearly complete: caller gets scope, prerequisites (required dates), and alternatives. The only thin spot is the return payload — 'Returns only report' doesn't indicate structure — but that is a minor gap for a report endpoint.

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% (id = Company ID, dateFrom/dateTo = YYYY-MM-DD), so the schema carries parameter meaning; the description only reinforces that the range is required versus v2's optional range. Baseline 3 is appropriate given the schema does the heavy lifting.

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 (Get) plus resource (original profit and loss / income statement) for a company over a required date range. It also names the exact sibling it differs from (get-profit-and-loss-v2) and two adjacent report tools, so the agent can disambiguate without opening any schema.

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?

Explicit routing: use this one when the date range is required and you only need the report; use get-profit-and-loss-v2 when the range is optional (defaults to YTD) or extra flags (containsUnreconciledData, hasMulticurrency) are needed; use get-balance-sheet / get-trial-balance for other financial statements. Covers when, when-not, and alternatives.

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