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

Goes well beyond the annotations (readOnlyHint=false, idempotentHint=true, openWorldHint=true): it explains requestId retry semantics, what happens on requestId reuse with different content, error replay on failed attempts, URL-dedupe behavior, the refusal list (non-https, IP literals, localhost, private networks including redirects, >50 MB, contentType/byte mismatch) and the required publish:post scope.

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 is front-loaded in the first clause, and every subsequent clause carries distinct operational information (idempotency, refusals, scope) with no filler. It is a single dense run-on paragraph, which is heavier than ideal but not padded.

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 4-param, no-output-schema mutation tool, the description supplies the return value (owned assetId), idempotency contract, validation limits and auth scope. The main remaining gap is that it never disambiguates from the similarly named soclo_library_upload sibling.

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; the description adds real meaning on top by tying requestId to retry/replay/conflict behavior and explaining that contentType must match the file's actual bytes. It adds little about filename, but the schema already covers it.

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 (Upload) plus resource (media) and destination (Soclo Library), and names a downstream consumer (soclo_post_publish). It does not, however, distinguish itself from the near-identically named sibling soclo_library_upload, so the agent gets no help disambiguating the two.

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 clear usage context: the asset is intended for soclo_post_publish and can be located later via soclo_library_search. It offers no when-not guidance and never addresses the soclo_library_upload sibling, so the alternative-selection case is left to inference.

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