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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description contributes the useful behavioral detail that figures are net of fees and include bitcoin's own weekly move as a benchmark. It says nothing about ordering, empty-week handling, or what the default window is despite zero required parameters.

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 sentence, front-loaded with the primary metric and tight with no filler. It is telegraphic to the point of reading as fragments ('goal reached, compounded total'), but nothing is wasted.

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?

With no output schema, the description must explain the return values, and it does list the fields, which is the right call. However, for a tool with zero required parameters, it never states what the default range is or how weekly rows are bounded, leaving a real gap an agent would hit on first call.

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 coverage is 100%, so both ISO-week parameters are already documented with pattern and example format. The phrase 'Optional range' confirms the optionality the schema already expresses but adds no semantics such as inclusive bounds or default behavior. Baseline 3 is 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?

Names a specific resource (weekly results) and enumerates the metrics returned: realized profit after fees, percent of capital in play, goal reached, compounded total, and bitcoin's move for the week. That is concrete enough to separate it from get_week (single week) and get_summary, though the description never states the separation explicitly and relies on the tool name for the verb.

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?

The only usage signal is 'Optional range,' which describes a parameter rather than when to call this tool. Nothing says when to prefer this over get_week, get_summary, or lookback_calculator, and there is no mention of what happens when the range is omitted.

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