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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds real behavior beyond that: that deal links come with claim_url for public deals, that claim_all_url enables one-sign-in bulk claiming, and the country-substitution rule including the fallback chain and the omit case. It stops short of describing error behavior for unknown slugs.

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 sentences, front-loaded with the scope statement, and every clause carries information about the payload or the country rule. The first sentence is a dense comma-separated field list that reads like a spec dump rather than prose, which costs a little readability.

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 carries the full burden of explaining return values, and it does so field by field, including the computed claim_all_url. For a two-parameter read-only tool with full schema coverage and complete annotations, nothing essential an agent needs to call it correctly 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 coverage is 100%, so the baseline is 3, and the description earns a bump by expanding the country parameter's effect beyond the schema's one-line summary: an unavailable pick is replaced by the next vendor in its category, or dropped if none qualifies. The slug parameter's accepted forms (slug, title, or URL) are left entirely to the schema.

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 opens with 'One startup pack in full' and then enumerates exactly what a caller receives (picks with category, Proven Score, band, portfolio usage, deal, availability, pick reason, claim_all_url), which pins down the resource and its scope. It is distinguishable from get_packs by the singular 'one pack' framing, but the retrieval verb itself is only implied rather than stated.

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 singular-versus-list distinction is implied by 'One startup pack in full', and the schema references get_packs for discovering slugs, but the description itself never states when to choose this over get_packs, get_offers, or get_vendor. There are no explicit exclusions or prerequisites, so the agent must infer routing from sibling names.

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