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

The description explicitly says the tool can 'update, or delete' an inbox, but annotations declare readOnlyHint=true and destructiveHint=false, and dedicated patch_agentmail_inbox / delete_agentmail_inbox siblings exist. This is a direct contradiction of the safety profile and could lead an agent to expect mutation capabilities that do not exist.

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?

The core is two short sentences, but the first sentence carries the misleading update/delete claim and a block of pricing boilerplate is injected mid-description. Structure is acceptable but not clean.

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?

An output schema exists, so return values needn't be explained, yet the description restates them and never clarifies the read-only nature of the operation. The contradiction with annotations leaves an agent with an incomplete and inaccurate picture of the tool's behavior.

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% for the single inbox_id parameter, so the schema already documents it fully. The description's 'by its ID' phrasing adds no meaning beyond the schema. Baseline 3 applies when the schema does the heavy lifting.

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 core action is stated with a specific verb and resource (retrieve a specific inbox by its ID), which is discernible. However, the description claims it can also 'update, or delete' an inbox, which muddies the purpose and conflicts with the read-only nature of the tool. It also fails to differentiate from siblings like get_agentmail_inboxes or the duplicate get_any_agentmail_apis_v1_agentmail_inboxes_inbox_81bd1e.

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?

No guidance on when to use this tool versus alternatives. With siblings such as get_agentmail_inboxes (list) and the update/delete variants, an agent gets no routing signal. The only implied usage is the 'by its ID' phrasing.

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