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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=false and destructiveHint=false, so the safety profile is fully covered. The description adds useful content context (mentions in canvas comments, approval results, loop reports) but says nothing about ordering, freshness windows, or what happens when limit is exceeded.

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 verb and resource, with the colon-delimited list of inbox contents adding information without padding. There is no redundant restatement of the title or annotations.

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-required-param, read-only list tool with rich annotations and a fully documented schema, the description covers what the inbox contains. It is only thin on routing versus the sibling list_approvals and on any indication of result ordering or volume.

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?

Schema description coverage is 100% with a single optional 'limit' parameter whose type, range (1-100) and default (30) are already documented in the schema. The description adds no parameter meaning of its own, so the baseline of 3 applies when the schema does all the work.

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 ('List') and resource ('the signed-in person's Wavelength inbox') and enumerates the two content types it returns (pending approvals, recent notifications). It distinguishes itself from the generic list_* siblings by scoping to the signed-in person, but it never names the closely related list_approvals or get_checkin_status to disambiguate.

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 implied rather than stated: 'the signed-in person's ... inbox' suggests a personal-scope call, and the 'recent notifications' framing implies recency rather than exhaustive enumeration. There is no explicit when-to-use, when-not-to-use, or pointer to list_approvals for a full approval listing.

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