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

Annotations already declare readOnlyHint, idempotentHint and openWorldHint=false, so the safety profile is covered. The description adds genuinely useful behavioral context by disclosing what the calculation returns (three formulas side by side plus a % of 1RM table), which matters because there is no output schema.

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?

One dense sentence front-loads the purpose and output composition, followed by a short link line. The marketing URL is mild filler but the definition is otherwise compact and well-ordered.

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 read-only, idempotent calculator with full schema coverage, the description is complete enough: it conveys inputs (submaximal set), methods, and deliverable (1RM values plus a programming table). No output schema exists, and the description compensates by describing the return content.

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 reps, weight and unit are all documented in the schema itself (including the accuracy caveat for reps). The description adds no parameter-level detail beyond what the schema already provides, making the baseline 3 appropriate.

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 ("Estimate") and resource (bench/squat/deadlift one-rep max) and names the exact methods used (Epley, Brzycki, Lombardi). No sibling tool covers 1RM estimation, so an agent can select it unambiguously from the large calculator family.

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?

"From a submaximal set" implies the usage context and the schema further notes the 2–10 rep accuracy window, but the description gives no explicit when-to-use guidance or exclusions (e.g. not for true max attempts or >15 reps). Usage is inferable rather than stated.

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