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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds little beyond restating the title: it does not say what milestones are produced, how close_days or target affect the schedule, or whether default anchor points are applied.

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?

A single front-loaded sentence with no filler or redundancy. It is efficient, though the brevity is partly under-specification rather than disciplined editing.

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?

This is a computation tool with no output schema, so the description is the only place an agent could learn what the returned milestone list looks like — and it says nothing about that. For a tool whose whole value is the generated schedule, that is a material gap.

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 all three parameters are already documented, including the agency|bank|hud|cmbs|bridge enumeration for target and the YYYY-MM-DD format for maturity. The description only reinforces that maturity is the anchor from which dates are derived; baseline 3 applies when 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 resource (dated refinance milestones) and the computation rule (working back from a loan maturity date), which is more informative than the title alone. It does not differentiate itself from siblings such as refinance_break_even or size_loan, so an agent cannot route between them on the strength of this text.

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 versus refinance_break_even, bridge_takeout, or the other refinance-adjacent siblings, and no stated prerequisites or exclusions. The agent must infer the use case entirely from the one-line purpose.

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