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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds genuinely non-schema information: the link requires no login and deliberately exposes no pricing and no cross-client data, which tells the agent what will be shared externally. It stops short of saying whether the link is permanent, expiring, or regenerable.

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, zero filler, with the resource and its scope front-loaded before the visibility caveats. Every clause carries information.

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 one-parameter read tool with full annotations and complete schema coverage, the description does enough: it says what the tool yields and what the artifact reveals to third parties. Only the link's lifetime/regeneration behavior is unaddressed, a minor gap for this complexity level.

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 100% and the single workspace_id parameter already documents its format (ws_…) and its source (list_workspaces). The description adds nothing about the parameter, so the baseline 3 applies.

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 (the public read-only report link) and its scope (one client workspace) and enumerates the report contents (mailbox health, spam rate, SPF/DKIM/DMARC). It is distinguishable from siblings like domain_health or warmup_stats, though it is phrased as a noun rather than an explicit verb, leaving the act of fetching a link implicit.

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 second sentence conveys the intended use case – handing a login-free report to a client – which implies when to reach for this tool. However, it never explicitly says when to use this versus domain_health, warmup_stats, or mailbox_activity, nor does it state exclusions or prerequisites.

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