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 genuinely non-obvious context beyond that: it discloses a data-privacy guarantee that lead identifiers, payloads, and credentials are withheld, which tells the agent what it can and cannot learn from the result. It stops short of describing volume, ordering, or time window 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?

Two short sentences with zero padding; the core purpose comes first and the privacy caveat second. Nothing is redundant with the annotations or the schema.

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 must convey the return shape. It says what is excluded (identifiers, payloads, credentials) and names the concepts returned (handoff outcomes, retry state), but it never describes the actual fields, ordering, or how many records come back — a moderate but real gap for the only source of return-value truth.

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 coverage is 50%: the project parameter is documented in the schema, but limit has no description at all, and the description adds nothing about it (no default, no max, no effect of recency window). 'Recent' loosely gestures at the limit concept but does not compensate for the undocumented parameter.

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 (Read) and a well-scoped resource (recent queued ESP/webhook handoff outcomes and retry state), which is more precise than the title alone. It does not, however, distinguish itself from near-neighbors like read_sending_status or list_email_deliveries, leaving overlap unresolved.

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 only implied: an agent can infer it is for inspecting recently queued handoffs and their retries. There is no explicit when-to-use, when-not-to-use, or pointer to read_sending_status / list_email_deliveries as alternatives, which is a real gap given three sibling tools touch delivery outcomes.

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