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

With no annotations supplied, the description carries the full burden and does reasonably well: it discloses that results are limited to the caller's own quests, that proof data (photo URLs, GPS, timestamp, notes) only appears once submitted, and that photo URLs require the same API key. It stops short of describing error behavior for missing ids or any pagination/size concerns, but the read-only nature is clear from "Get".

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 front-loaded sentence plus a short parenthetical enumeration and an auth caveat; nothing is padded. The trailing "Photo URLs need the same API key" is terse to the point of being slightly cryptic, but it earns its place as non-obvious information.

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 one-parameter read tool with no output schema and no annotations, the description covers purpose, returned fields, ownership scoping and an auth quirk — enough to call it correctly. The main residual gap is the id format and error/empty behavior, which are minor for this complexity.

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 0% and the single quest_id is untyped in prose beyond "by id". The description does add meaningful scope semantics — the id must identify one of your own quests — but gives no hint about the id format or where to obtain it (presumably from list_quests or create_quest).

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?

"Get one of your quests by id" states a specific verb (get), resource (quest), scope (owned quests, singular) and even previews the payload (status plus quester proof). This implicitly separates it from list_quests, though 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?

The single-by-id framing implies the use case (fetch details for a known quest), but there is no explicit when-to-use vs list_quests, no statement about what happens with an unknown or foreign id, and no prerequisites beyond the API-key note about photos.

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