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

The description adds context beyond the annotations: it requires a privileged API key, and data appears within ~24 hours. It also implies the operation persists a key. Annotations already indicate a non-readonly, non-destructive mutation, and the description complements this with operational details. No contradictions.

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 sentences, each with a distinct purpose: what/why, how to get the key, and prerequisites/expected latency. No redundant information.

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?

The tool is simple (2 parameters, no output schema), and the description covers purpose, source, permissions, and latency. It could mention the behavior of repeated calls or verification, but the essentials are covered. Sibling tools for status checks exist, so a user can verify post-setup.

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?

The input schema covers both parameters with descriptions, including the source of the key and an example label. The description repeats the key source but doesn't add new parameter details beyond the schema. Given 100% schema coverage, a baseline of 3 is appropriate.

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 uses the verb 'Store' and specifies the resource (Microsoft SNDS automated-data-access key), and explains the purpose (enabling daily per-IP reputation sync). This clearly distinguishes it from sibling tools like get_snds_ip_stats and get_snds_status which read data.

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 states the context for use: to enable daily syncing of Outlook/Hotmail reputation. It also specifies the permission prerequisite (owner/admin API key with write or full scope). However, it does not explicitly name alternatives or state when not to use it, 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.