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

The annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint, so the safety profile is covered. The description adds no behavioral context such as calculation assumptions, required inputs, or expected output, and the vendor phrase is opaque rather than informative.

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 short but poorly structured, combining a vague purpose phrase with an irrelevant vendor note. It is concise only in length, not in usefulness.

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 financial projection tool with five numeric parameters, no schema descriptions, and no output schema, the description is completely inadequate. An agent cannot determine how to call it correctly or what to expect from the result.

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?

The input schema has 5 parameters with 0% schema description coverage, and the description mentions none of them. It provides no meaning for currentBalance, annualContribution, years, employerMatchPct, or expectedReturnPct.

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 phrase '401k projection' vaguely restates the tool name rather than stating a specific action like 'calculate projected 401k balance'. The addition 'client and server side from freedailypro' adds no clarifying information about what the tool actually does.

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?

There is no guidance on when to use this tool, when not to use it, or which siblings might be alternatives. The description offers no context beyond an unclear restatement of the name.

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