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

Annotations already declare readOnlyHint=false and destructiveHint=false, so the mutation-safety profile is covered. The description adds the Space scoping behavior, but for an upload tool it says nothing about accepted file format, what happens to previously uploaded data (merge vs. overwrite), or how duplicate/unparseable reports are handled — meaningful gaps that annotations do not fill.

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, no filler, with the core purpose and the Space-scoping caveat front-loaded. Every clause earns its place.

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 mutation tool with a nested body and no output schema, the definition should say what a successful upload produces or replaces and what format the report text must be in. It covers scoping well but leaves the ingest contract and post-upload state ambiguous.

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 space_id and business_id semantics are already documented in the schema and the description merely echoes the space_id override. The nested body object (text, filename, platformId) is described only as "matching the AuctionImport schema," and the description adds no format guidance beyond 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 states a specific verb and resource ("Upload an Auction insights report") and narrows the niche to platforms whose API does not expose per-competitor auction data, which distinguishes it from the API-driven competitor tools. It does not name the sibling it replaces (e.g. get_competitor_auction or refresh_competitor), so the differentiation is implied rather than explicit.

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?

It gives a clear trigger condition — use this when the platform's API does not share per-competitor auction data — and handles the Space-scoping alternative by pointing at set_active_space or the space_id override. It does not state when not to use it (for example, when API-sourced auction data already exists), so a 4 rather than 5.

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