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

Despite annotations already declaring idempotentHint=true and destructiveHint=false, the description adds valuable context: the URL never changes, visitor browser data survives the update, and a drop keeps its type. It also clarifies authentication behavior with account tokens, which is not visible in the annotations and materially changes how the tool may be invoked.

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?

Four sentences, each carrying distinct information: the core action, the URL-stability guarantee, the type-lock constraint, and the authentication simplification. The description is front-loaded with the main purpose and contains no redundant elaboration of schema details.

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-parameter tool with no output schema, the description covers the key invocation pitfalls: the zip restriction, the type invariant, the stable URL behavior, and token requirements. Combined with the input schema's dropId pattern and parameter descriptions, an agent has enough context to call this tool correctly without needing to guess at undocumented behavior.

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 75%, and the description goes beyond the schema by explaining the relationship between html and zipBase64 (tier-4 graduation), the type-matching constraint, and when managementToken can be omitted. dropId is not discussed, but its pattern in the schema is sufficient and it is the sole required parameter.

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 opens with a specific verb and resource: 'Replace the content of an existing drop.' It also clearly distinguishes the operation from related tools by stressing 'existing' content replacement, the type-lock rule, and the URL-stability contract, so an agent can tell it apart from publish, delete, or rollback.

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 description gives concrete conditions for when replacement is valid: HTML for single-file drops, base64 .zip only after tier-4 graduation, same-type replacement, and token requirements for owned drops. It does not explicitly name sibling alternatives like dropyour_publish or dropyour_delete for disambiguation, but the constraints make the appropriate usage clear enough.

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