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

The annotations already declare destructiveHint=true, idempotentHint=true and openWorldHint=true, so the mutation and repeat-safety profile is known. The description adds genuine value beyond that by disclosing the concrete side effects — recurring checks and possible email alerts restart — and the permission requirement. It does not say whether the resumed state is reversible or what happens when the plan limit is exceeded, which caps it above the minimum but below the top.

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, each front-loaded with actionable information: the action, the side effects, the permission gate. Nothing is redundant or padding.

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 one-parameter mutation tool with no output schema, the description covers the effect (checks and alerts restart), the eligibility constraints (user-chosen watch, current plan) and the auth requirement. The remaining gap is the absence of guidance on sourcing watch_id and on failure 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 0% for watch_id, so the description must carry the meaning. 'The watch the user chose' only hints at ownership and gives no indication of how the ID is obtained (e.g. via list_watches) or what a malformed/foreign ID does, leaving the single required parameter largely undocumented.

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 gives a specific verb and resource ('Resume a watch') and scopes it to a user-chosen watch within their plan, which distinguishes it from pause_watch, delete_watch, get_watch and watch without opening any schema. It stops short of naming a sibling, but the verb itself carries the differentiation.

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?

It states the preconditions for use clearly: the watch must be one the user chose, resuming must fit the current plan, and the caller needs watch-management permission. There is no explicit when-not guidance or referral to list_watches/watch for finding the right watch, so it falls 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.