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

With no annotations, the description carries the full behavioral burden. It usefully discloses that replace clears rows on replace_calendar_id while keeping the same id, and that Twitter usernames are resolved to account_id, but it omits permissions, reversibility, failure behavior, and return information.

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?

The description is two tight sentences with the action and mode semantics front-loaded. The username-resolution note is additional but relevant, and there is no filler.

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/import tool with no annotations and no output schema, the description covers the key destructive replace behavior and username resolution. It still leaves gaps around permissions, failure handling, and what the caller should expect after import.

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 all five parameters, including the enum values for calendar_import_mode and the conditional requirement for replace_calendar_id. The description reinforces mode semantics and mentions username resolution, but does not add substantial parameter-level information 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 action and resource: pushing portable calendar JSON, with modes for creating a new calendar or replacing rows in an existing one. It clearly distinguishes the two import modes, though it does not explicitly differentiate this tool from nearby siblings such as import_webpage_calendar or create_content_calendar.

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 implied guidance through the create/replace mode distinction and the warning that replace clears rows on replace_calendar_id. However, it does not say when to choose this tool over alternatives like import_webpage_calendar, create_content_calendar, or export_content_calendar_json.

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