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

The annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, covering the safety profile. The description adds domain context around DCA and crypto but does not disclose calculation assumptions, limitations, or other behavioral traits beyond what the annotations already provide.

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 front-loaded and only two sentences long. The first sentence is essential; the second is a useful cross-reference, though not strictly necessary for invoking this tool correctly.

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?

Given the presence of an output schema and rich annotations, the description needs mainly to establish purpose and domain. It does so adequately, though it could better differentiate this DCA calculator from other crypto-related calculators.

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 input schema already documents all four required parameters. The description itself adds no parameter-level meaning, making the baseline score 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?

The description gives a specific verb and resource: calculating DCA portfolio value and performance for recurring crypto investments. It is clear what the tool does, but it does not explicitly distinguish itself from crypto-adjacent siblings such as calculate_crypto_profit_loss or calculate_portfolio_allocation.

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 phrase 'for recurring crypto investments' implies the intended domain, and it points to list_bundles for related calculators. However, it gives no explicit when-to-use or when-not-to-use guidance relative to alternative calculators.

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