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

With no annotations, the description must carry the behavioral burden. It correctly conveys that this is a stateless derivation from three inputs (plus optional target profit) and that two outputs are produced, but it never states the return shape (sales counts, presumably per month), units/currency assumptions, or that nothing is persisted. For a pure calculator the risk is low, but disclosure is thin.

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, no filler, and the primary output (break-even sales per month) is front-loaded before the secondary target-profit case. Every clause carries information.

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 four-parameter, no-output-schema calculation tool this is nearly complete: inputs are enumerated and the two results are named. It falls just short of full completeness because the absence of an output schema means the description should ideally pin down what the returned numbers look like (count of sales, per month) rather than leaving it to inference.

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's 'fixed monthly costs, price per sale and variable cost per sale' maps cleanly onto the schema, but it adds no unit conventions, currency handling, or rounding detail beyond what the parameter descriptions already say.

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 gives a specific verb+resource (compute monthly sales volume needed to cover costs / hit target profit) and frames it as the answer to a named question, 'what is my break-even point?'. This is unmistakably distinct from the sibling finance tools (profit_margin, ebitda, business_valuation_estimate, freelance_rate, acquisition_affordability).

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?

It implicitly tells the agent when to reach for it — when the user asks for a break-even point and supplies fixed costs, price and variable cost. However, there is no explicit when-not guidance, no statement of prerequisites, and no routing to alternatives such as forge_profit_margin for margin questions.

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