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

Annotations already cover the safety profile (readOnly=false, destructive=false, idempotent=false, openWorld=false), so the description only needs to add context - and it does, by disclosing the propagation effect: the logo is injected into all quizzes, reports, and PDFs of the workspace. It stops short of stating what happens to an existing logo (overwrite) or any size/format constraints.

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?

Three short sentences, front-loaded with the action, then the effect, then the input rule. No filler and each sentence carries distinct 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 mutation tool with no output schema, the description covers the action, the accepted input modes, and the visible effect across the workspace. It omits overwrite behavior, permission requirements, and accepted file formats/sizes, which would matter for correct invocation but are relatively minor.

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, but the description adds genuine meaning beyond the schema: it imposes an 'exactly one of url or file_base64' constraint that the schema itself does not express (both are optional with no oneOf). This resolves a real ambiguity about valid input combinations.

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 ('Загружает логотип рабочего пространства') and clarifies the two accepted sources (URL or base64). It does not explicitly differentiate itself from near siblings like upload_quiz_media, upload_quiz_widget_image, or delete_workspace_logo, relying on the tool name to carry that distinction. Clear but without explicit sibling routing.

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 provides a mutual-exclusivity rule ('Укажите ровно один способ: url или file_base64'), which is a usage constraint, but gives no guidance on when to prefer this tool over alternatives or any prerequisites (permissions, allowed formats/limits). Usage is implied rather than explained.

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