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

Annotations already declare destructiveHint and idempotentHint, so the safety profile is partly covered. The description meaningfully adds behavior beyond that: only manually-editable fields change, integration-synced and image fields are skipped, and an unknown id or invalid value fails the whole update. It does not state that existing values are overwritten (the destructive aspect).

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 tight sentences, front-loaded with the action, then the payload shape, then the important exclusion and skip rules. No filler or repetition.

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 no explanation, and the description covers the remaining gaps: what gets skipped, when the whole update fails, and that email is handled elsewhere. Nothing needed to invoke it correctly is missing.

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 schema already documents id, context, and the nested smart_fields item shape that the description restates. The description's parameter-level value is mostly a summary rather than new semantics, so the 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?

States a specific verb and resource ("Set a teammate's smart-field values") and scopes it by naming what is out of scope. An agent can distinguish this from update_smart_field (field definitions) and create_teammate (creation) without opening the schema.

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 gives an explicit when-not: "Email addresses are managed separately, not here," which stops the agent from attempting email edits through this tool. However, no alternative tool is named for email changes, and no prerequisites (e.g., needing field IDs from list_teammates) are stated.

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