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

No annotations, so the description carries the full burden. It usefully discloses the architectural distinction between the poll plane and the telemetry plane, which is real context beyond the name, but it says nothing about return shape, ordering, or whether 'available' accounts for already-connected providers.

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 short sentences, zero filler, with the primary scope stated first and the exclusion plus documentation pointer second. Nothing could be removed without losing information.

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 zero-parameter, no-output-schema lister, the description conveys what set is returned and what falls outside it, which is enough to invoke it correctly. A word on how the result feeds connect_provider would have made it complete.

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 and the schema is empty, so there is nothing for the description to disambiguate. Baseline 4 applies; no parameter detail is 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 resource and its scope precisely: providers connectable with an API key, in the 'poll plane'. The listing verb is only implied by the tool name rather than in the description, and the sibling connect_provider is never named, so differentiation is left partly to inference.

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?

The description supplies a data-scope boundary -- API-key providers here, everything else via telemetry ingest docs -- which tells the agent this list is not exhaustive. It never states when to call this rather than list_connections or connect_provider, so tool selection remains implicit.

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