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 covered. The description does add two useful behavioral facts beyond the annotations: only *public* packs are readable, and the response includes the version list — which matters because there is no output schema. It stops short of stating what happens for a private or unknown slug (error vs empty) or how many versions are returned.

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?

One short, front-loaded sentence with no filler. It slightly muddles input and output concerns by folding "the list of available versions" into what reads like a purpose statement, costing a little crispness, but the economy of language is good.

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 two-parameter read tool with rich annotations and no output schema, the description is minimally viable: it tells the agent what comes back (a version plus the version list), which compensates for the absent output schema. Gaps remain on slug semantics, error behavior for unknown/non-public packs, and how to discover slugs (check_packs_list).

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 50%: check_pack_version is fully documented in the schema ("Omit to read the current version"), while check_pack_slug has no description anywhere. The description names neither parameter's format or constraints (3-80 chars, slug syntax), so it adds essentially nothing over the schema. Mid-range coverage plus a trivially small parameter set keeps this at baseline 3.

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?

A specific verb ("Read") and resource ("one public check pack version") with an added payload detail ("list of available versions"). An agent can distinguish it from check_packs_list, but the description never names or contrasts that sibling explicitly, so differentiation is inferential 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?

There is no guidance on when to call this versus check_packs_list (enumerate packs) or check_pack_register (create one), and no mention of prerequisitives such as knowing a slug. The only implied usage cue is "public," which hints at access scope rather than selection criteria.

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