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

Annotations already cover safety (readOnly, idempotent, non-destructive, closed-world), so the bar is lower. The description still adds real context: it claims authority ('exactly as the Solutions guide and billing price it'), discloses the three pricing strategies used, and warns that enterprise tier is 'quoted in person' — signaling the agent may not get a numeric result. It does not mention error behavior for invalid service combinations.

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?

Two sentences, front-loaded with what the tool returns and the pricing rule, with the team-size taxonomy following. The nested parentheticals are dense but each carries information; nothing is padding. Slight readability cost from the stacked clauses in sentence one.

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?

With no output schema, the description does the necessary work by naming the return values (monthly and yearly price) and the authority behind them. The team-size semantics and enterprise caveat round out a two-parameter, low-complexity tool. Only the failure/edge behavior for unusual service sets is left unstated.

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 compensate, and it largely does: it defines every team_size band with headcount ranges (solo = just me, small 2-5, mid 6-20, large 21-100, enterprise >100) and flags the enterprise exception. For services it explains that the set determines which pricing strategy applies. It does not clarify array behavior (min 1, max 18) or whether invalid/duplicate entries are rejected.

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 concrete verb-and-resource pair: computes the monthly and yearly price of a set of UBM services at a given team size. It also explains how the price is derived (best of one-by-one, package plus extras, or Everything), which separates it in spirit from ubm_recommend_plan and ubm_request_plan. It never names those siblings explicitly, so an agent must infer the boundary rather than read it.

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 implied: call it when you need a price for a specific service set and team size. There is no explicit when-not guidance and no named alternative (e.g., 'use ubm_recommend_plan to pick services, then this to price them'). The enterprise note ('quoted in person') hints at a boundary case but is framed as pricing behavior rather than a routing rule.

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