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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds real context beyond that by scoping results to "this connection" and flagging that team workspaces/writers are the multi-writer scheduling surface — a behavioral detail annotations cannot express. It does not mention auth failures or empty-state behavior, keeping it just short of a 5.

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 front-loaded sentence with the resource first and the returned fields after. The field enumeration is long but each item tells the agent whether the data it needs is present, so nothing is wasted.

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?

An output schema exists, so the precise return shape is already documented; the description only needed to summarize contents, which it does. For a read-only, zero-argument tool this is nearly complete, with only the unauthenticated/error path left unspecified.

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 there is nothing for the description to disambiguate; the baseline for a no-arg tool applies. The description correctly implies parameter-free invocation by saying it returns the authenticated user.

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 ("Get the authenticated Narrareach user") and then enumerates the exact data returned: name, email, timezone, plan, connected platforms, Substack publications, and team workspaces/writers. This clearly distinguishes it from siblings like get_voice_profile and get_settings, which cover narrower slices of the account.

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?

"Authenticated" implies no target-user argument is needed and that the tool operates on the current connection, which is implicit usage guidance. However, it never says when to prefer this over get_settings or get_voice_profile, or what happens when the connection has no team workspaces.

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