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

Annotations already declare readOnlyHint=false, destructiveHint=true, idempotentHint=false and openWorldHint=true. The description corroborates the write nature and adds the endpoint, but says nothing about what destructive side effects entail, retry/duplication risk given non-idempotency, or auth/prerequisite needs.

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?

One dense sentence, front-loaded with the WRITE marker and the subtype split. Every clause (subtype requirements, association, endpoint) carries information; nothing is 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 10-parameter mutation tool with no output schema and full schema coverage, the description covers the subtype distinction, association options, and the write endpoint. It omits return-value expectations and any note on category_id being required by Pipeline CRM, a minor gap the schema partially fills.

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 all ten parameters are already documented in the schema, including the 'Tasks only' / 'Events only' constraints the description repeats. The description adds no format, default, or interaction detail beyond what the schema states, so the baseline 3 applies.

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 (create) and resource (calendar entry) plus the two subtypes it produces, with their required fields. 'WRITE:' and the POST endpoint make it unmistakably distinct from the get/list/update_calendar_entry siblings.

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?

Clear guidance on choosing between the task and event subtypes (due_date optional vs start_time/end_time required) and on the optional deal/person/company association. It does not name a sibling alternative (e.g. update_calendar_entry) or state exclusions, so it stops short of a 5.

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