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

Annotations already declare readOnlyHint, idempotentHint and openWorldHint=false, so the safety profile is covered. The description adds genuine context beyond that by describing the fields each catalog entry exposes, which is valuable given there is no output schema. It stops short of saying how large the result set is or whether entries are ordered or paginated.

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?

A single sentence, front-loaded with the core resource, with zero filler. The trailing phrase 'and its connections' is slightly ambiguous — it is unclear whether that means connections per service or aggregated — which keeps it below a 5.

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?

For a no-argument, read-only listing tool with no output schema, the description covers the essential return semantics and the annotations cover safety and idempotency. The remaining gap is result size/ordering behavior, which matters for a catalog that could be long.

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, so the baseline is 4; there is nothing for the description to compensate for on the input side. It correctly adds no parameter discussion that would be redundant.

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 names the resource precisely — a catalog of every service the platform can connect — and lists what each entry carries (connected status, one-click sign-in availability, connections). That is specific enough to separate it from a plain connection list, though it never names list_connections or search_connectable_apps as the contrasting tools.

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 only implied: an agent can infer this is the discovery step before connecting, but there is no explicit when-to-use versus list_connections (existing connections) or search_connectable_apps (searching the same space). No preconditions or exclusions are stated.

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