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

Annotations already declare a safe read (readOnly, idempotent, non-destructive), and the description adds real beyond-annotation context: the manual-service routing rule, the SaaS-security written-authorization requirement, and the operator approval gate. Return contents are also described, which is extra since an output schema exists.

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?

Front-loaded with what gets compared and what comes back; the later sentences carry routing and authorization constraints that earn their place. It is dense and mixes return-value detail with policy rules, costing a little readability, but no sentence is pure filler.

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 rich annotations, a present output schema, and zero input parameters, the description only needs to cover routing and prerequisites, and it does both (order-page vs order_service, written authorization, spending approval). An agent can act on it without further context.

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 tool takes zero parameters, which is the baseline-4 case; there is nothing for the description to disambiguate. Schema coverage is 100% and no input semantics are missing.

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 the comparison verb and enumerates the actual offerings (KnownFix reviews, Verified Repo Fix, Microsite Launch), which is more concrete than the bare title 'List professional services'. It also implicitly separates itself from order_service, though it never says plainly 'all available services' and the phrasing 'Compare all current...' is slightly oblique.

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?

Explicitly routes the agent: manual services must use their own order page, 'not order_service', and checkout-only services require operator spending approval and target authorization. It does not distinguish this tool from other listing siblings (list_catalog, list_skills, list_merch, get_offer), so it falls short of a full 5.

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