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

Annotations already declare readOnlyHint and idempotentHint, covering the safety profile. The description adds significant extra context: the cost ($0.003), payment instructions for the Saylor endpoint, and the explicit statement that it does not download or execute package code. This goes beyond what annotations 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 two sentences with zero waste. The core purpose is front-loaded, followed by essential caveats (cost, payment, safety). It is concise and well-structured, earning every word.

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 single-parameter read-only tool with no output schema, the description covers all necessary aspects: what data is returned, cost, payment process, and safety. It is complete for an agent to invoke correctly without additional assumptions.

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?

The schema fully describes the 'name' parameter with a clear explanation of the expected format, so the description adds no parameter-specific meaning. Since schema coverage is 100%, a baseline of 3 is appropriate, and the description does not compensate further.

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 inspects the latest npm package release and enumerates specific details (version, license, dependency counts, engine requirements, deprecation notice, source links). It distinguishes itself from sibling token/wallet tools and even clarifies it does not execute code, making the purpose unambiguous.

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 implies usage when one needs npm package release information, but it does not explicitly contrast with alternatives like get_npmsearch_report or mention when not to use this tool. There is no exclusion or alternative guidance, so the agent must infer the appropriate context.

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