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

Task decomposition quality is strong, keeping the five elements clearly separated through compound-complex sentences. The second discovery (line 53-55) closes the loop and confirms the transformer expects exactly the 35-field structure defined in discovery 44. However, rebuild_drift is not exercised in any discovery and remains unverified.

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 sentences, both carrying information, with the returned-content detail front-loaded. The only waste is the slightly confusing 'Read the existing onboarding preview' clause, which restates the verb rather than adding scope.

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 zero parameters, full annotation coverage, and an output schema that documents the return shape, the description covers the one thing structured fields cannot express: that the call records a view. That is sufficient for correct invocation, though the relationship to refresh_threads remains unstated.

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 100% schema coverage baseline of 4 applies. The description correctly conveys that the scope of the returned set is fixed by the server rather than by caller input.

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 a specific resource (threads) and quantifies the payload ('five open threads with saved replies and safe locked previews'), which is genuinely informative. But the framing as 'Read the existing onboarding preview' muddies whether this lists threads or fetches a preview object, and it never distinguishes itself from the sibling refresh_threads.

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?

There is no explicit when-to-use guidance and no mention of the obvious alternative, refresh_threads, which appears to operate on the same resource. The onboarding-preview phrasing implies a first-run context but leaves the agent to infer it.

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