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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint=false, so the safety profile is covered. The description adds the content scope of the digest (sent, replies, interviews, messages, waiting items) and mentions a readable summary field, but the `say` reference is left unexplained and no default window or auth context is restated.

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 short sentences with no padding, and the category enumeration is front-loaded after the opening statement. The first sentence duplicates the title almost verbatim, which is the only waste.

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 no output schema, the description sensibly enumerates the kinds of changes returned and points at a ready-to-read summary, which is enough for a zero-required-parameter read tool. The hand-off to `say` is never defined, leaving a small dangling reference an agent cannot resolve.

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?

There is a single optional parameter with 100% schema description coverage, including its ISO format and 24-hour default, so the schema carries the semantics. The description adds nothing about `since` beyond what the schema already states, making the baseline 3 appropriate.

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 the resource scope precisely - applications sent, replies, interviews, messages, and pending items - which is more than the title's bare 'what changed since a moment'. An agent knows this is an aggregate digest rather than a raw list. It does not, however, differentiate itself from lookalike siblings such as list_actions, get_tracker, or get_hiring_updates.

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 phrase 'For "what's new this morning"' supplies one concrete usage scenario, which is implied guidance rather than explicit routing. There is no statement of when NOT to use it and no named alternative among the dozens of read-oriented siblings, so the agent must infer the boundary itself.

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