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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is clear. The description adds no new behavioral traits beyond stating what the tool returns. It does not mention rate limits, authentication, or any edge case behaviors, which is acceptable given the rich annotations but not an addition.

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 three sentences, front-loaded with the main action, includes usage guidance and a clear list of return contents. Every sentence earns its place, and there is no fluff or redundancy.

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 tool that returns a structured memo with one optional parameter and an output schema, the description covers purpose, usage, and contents adequately. It does not need to explain return format since output schema exists, and annotations cover safety. No critical context is missing.

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% and the parameter is well-described in the schema. The description lists the memo sections in prose (overview, product, traction, etc.) which align with the enum values, but it does not explicitly connect to the 'section' parameter or explain how to use it. The baseline is 3 due to high schema coverage; the description adds marginal value.

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 clearly states the tool returns a structured investment memo for a specific company (DPX / LuxPerpetua). It uses a specific verb ('Returns') and resource ('investment memo'), and distinguishes from siblings by explicitly stating use cases for due diligence, investment evaluation, and company reports.

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 description explicitly says 'Use this tool if you are an AI agent conducting due diligence, evaluating DPX as an investment opportunity, or building a company report.' This provides clear usage context. However, it does not mention when not to use it or suggest alternative tools for quick metrics, which would elevate it to a 5.

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