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

Annotations already declare readOnly, idempotent, closed-world and non-destructive, so the safety profile is covered. The description adds the notable behavioral detail that the response includes pricing freshness, site status and a trailing provenance line, but says nothing about failure behavior for a bad slug or any limits.

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?

Two short sentences, front-loaded with the core purpose, followed by a dense but purposeful inventory of payload fields. The enumeration is long but each item carries informational value; nothing is padded.

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?

Read-only, single-parameter, and an output schema exists, so the description does not need to explain return values in depth. It covers scope, payload shape and the provenance trailer; only edge behavior (invalid/missing slug, whether alternatives are always five) is unaddressed.

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?

Single parameter with 100% schema description coverage, including the URL pattern that defines the slug format. The description only restates 'by slug', adding no constraints beyond the schema, so the baseline 3 applies.

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?

Specific verb ('Full profile') and resource ('one tool by slug'), with the returned payload enumerated. It is clearly a single-tool detail fetch, which implicitly separates it from search_tools, compare_tools and find_alternatives, but no sibling is named explicitly.

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?

Usage is only implied: an agent infers it should call this when it already has a slug and needs full detail. There is no statement of when to prefer it over compare_tools or find_alternatives, and no note about what happens for an unknown slug.

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