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

The annotations already cover the safe-read profile (readOnlyHint, idempotent, non-destructive, closed-world), so "It changes nothing" is largely redundant. The description does add value the annotations cannot: it declares the sign-in prerequisite to Faxette and explains what an empty response means, both of which shape agent behavior.

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?

Three front-loaded sentences that carry a lot of distinct information with no filler. The closing "It changes nothing" is the one expendable clause, since the readOnly and destructive hints already say so.

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 parameterless read with an output schema and full annotations, this is complete: prerequisites, return contents, empty-state handling and downstream usage are all covered. Nothing an agent needs in order to call it and interpret the result is absent.

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 and nothing is missing. The description goes slightly further by mapping the returned id to the `organization` argument used by sibling tools, which helps the agent chain calls correctly.

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 ("see which organizations the person let this app use") and enumerates the returned fields: id, name, role, plan, card on file, fax numbers. This clearly separates it from sibling read tools like get_account, get_capabilities and get_blocked_senders.

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 says what to do with the result: "Pass an id as organization to the inbox tools, create_fax and get_faxes." It also explains the empty-list case and its remedy (the person can reconnect the app to choose), which pre-empts the main ambiguity an agent would hit.

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