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

The annotation surface is thin (destructiveHint=true only), and the description corroborates the mutation and adds account scoping plus a warning that `type` is free-form and account-specific. However, it does not disclose permission requirements, whether the override expires automatically or must be removed, or how it interacts with existing overrides — meaningful gaps for a state-changing tool.

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?

Front-loaded with the action and its effect, followed by the two caveats an agent actually needs before calling. The trailing API endpoint reference is mildly redundant but compact, so nothing meaningfully dilutes the definition.

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 7-parameter mutation tool with no output schema and near-empty annotations, the description covers the core action and the trickiest parameter caveat, which is adequate. It stops short of describing the return payload or the lifecycle of an override, leaving some uncertainty an agent must resolve by trial or by reading the schema.

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 every parameter including userId, teamId, escalationTier, and replacementUserIds is already documented in the schema. The description restates the semantics of `type` and `start`/`end` but adds no syntax or validation detail beyond what structured data supplies, so 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 (creates) and resource (on-call override) and clarifies the effect in parentheses ('temporarily changes who is on call'), which cleanly separates it from the read-oriented sibling allquiet_list_on_call_overrides. It also scopes the operation to the LIVE account, so an agent can place it immediately.

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 only implied by the purpose statement; there is no explicit when-to-use vs when-not guidance, no named alternative for inspecting or removing overrides, and no stated prerequisites beyond confirming the `type` values. An agent can infer intent but gets no routing help.

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