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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds real value beyond that: it discloses that each item carries its full original params (model, aspect_ratio, prompt, credits) and result URLs, and explains the reuse path via medias[].value in a popcraft_generate_* call. It does not mention pagination behavior or result-count limits beyond the cap, which keeps it short of a 5.

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?

Purpose and scope are front-loaded in the first sentence, followed by filtering, the reuse workflow, and the routing guidance. It is a dense paragraph with no filler, though it is long enough that the polling caveat and the job_display pointer could be tightened into one sentence.

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?

There is no output schema, so the description carries the return-shape burden and does so by describing item contents (original params and result URLs) and ordering. Combined with the usage routing and annotation-covered safety profile, an agent has everything needed to call it correctly.

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 description coverage is 100%, so the schema already documents both parameters, including the enum and the 1-50 range. The description's restatement of type filtering and the limit default/max adds no syntax or semantics beyond the structured fields, 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?

States a specific verb and resource ('List the current user's recent Popcraft generation jobs'), the resource subtypes (image/video/audio), and the ordering ('most recent first'). It also implicitly distinguishes itself from popcraft_job_display and popcraft_job_status by describing the history-browsing scope rather than live status.

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?

Gives concrete use cases ('find a job_id from an earlier session', 'show the user their generation history'), an explicit negative ('do NOT call it repeatedly as a post-generation poll step'), and names the sibling to use instead for live status ('popcraft_job_display'). This is exactly the when/when-not/alternative pattern.

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