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

Annotations already establish that this mutates state, is not destructive, and is explicitly not idempotent; the description adds real meaning by explaining what 'manages' buys the member (cost visibility, spike notifications). It does not resolve the biggest ambiguity the annotations raise: with idempotentHint false, does this replace the member's current team list wholesale or merge into it? Nor does it mention permissions or blast radius.

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?

One sentence, front-loaded with the action and the resource, with the effect clause appended after the colon. No filler. Slightly dense but nothing to cut.

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 and annotations cover the safety profile, so the description does not need to describe returns. What is still missing for a two-param mutation is the replace-vs-merge semantics and the format/meaning of team entries, both of which an agent needs before calling.

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%, so the description must carry the parameter burden. It explains user_id well (an integer obtained from list_members), but the teams array -- the core payload, capped at 200 items with 80-char strings -- is never described: no indication whether these are team names or identifiers, what happens with unknown teams, or what an empty array means. Half the parameters, including the one carrying the write, are 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?

States a specific verb and resource: sets which teams a member manages, and explains the consequence (visibility into those engineers' cost, spike alerts). That consequence sentence also separates it from the sibling set_team, which is about teams themselves rather than the manager relationship. It stops short of explicitly naming the nearest siblings (set_team, change_member).

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?

Points the agent at list_members as the source for user_id, which is genuinely useful routing. But there is no statement of when to use this vs set_team or change_member, and no prerequisites such as admin rights or whether the user must already be a member.

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