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

Annotations already declare readOnly=false, idempotent=true, and destructive=false, covering the safety profile. The description usefully adds the workspace-timezone scope and weekday/time conventions, but discloses nothing about auth needs, limits, or what happens to conflicting existing slots.

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 core action and immediately followed by the format constraints. No filler, and the 'Related:' routing line earns its place.

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?

An output schema exists so return values need not be explained, and the add/remove/timezone semantics are covered. Slightly incomplete on mutation behavior (conflict handling, permissions), but fully adequate to invoke the tool correctly.

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: the schema only constrains weekday to integers 1-7 with no mapping, while the description supplies '1 (Monday) through 7 (Sunday)' and clarifies that time is interpreted in the workspace timezone.

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 pair (adds/removes) and a precise resource (recurring weekday+time posting slots) for a named target (a channel). It's clear and unambiguous, though it doesn't explicitly contrast itself with any sibling beyond a loose 'Related:' list.

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?

Usage is implied rather than stated: the 'remove' ids are noted as coming from get_calendar, and three related tools are listed, but there is no explicit when-to-use-this vs an alternative or when-not-to-use guidance.

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