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

Annotations already declare the mutation profile (readOnlyHint=false, idempotentHint=true, destructiveHint=false), so the bar is lower. The description earns credit by adding real context beyond that: a per-call cost of $0.001, no charge on failure, and the handler-change exclusion. It still does not say whether categories replace or append, which matters for an idempotent update.

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 sentence is front-loaded and tight, but "$0.001." appears as a dangling fragment immediately before "Costs $0.001 per call; nothing if it fails" — the same fact stated twice. Trimming the redundant fragment would make this a clean two-sentence definition.

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 four optional parameters, no output schema, and update semantics that hinge on partial-vs-full replacement, the definition leaves the key operational question unanswered. Cost and handler scope are covered well, but an agent still cannot tell what a successful call returns or whether omitting a field clears it.

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 0%, so the description must carry semantics, and it does map to all four fields (name, categories, intro, and "where else people may report" for external_info). But that mapping is only a name-level gloss with no format, replacement-vs-merge, or limit detail — the 12-item cap on categories and the 20000-char intro limit live only in the schema.

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?

A specific verb ("Change") plus the fields it touches (name, categories, intro, external reporting location) makes the operation unambiguous and distinguishable from whistleblowing_create_channel. The resource is only implied by "the channel's" rather than naming the whistleblowing channel, so the title has to carry a little of the load.

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 handlers are the owner's to change, on their account page" is a genuine scope exclusion telling the agent this tool is not the path for handler changes. However, there is no guidance on when to update versus create a channel, or on what happens if a caller omits fields, which is the more likely agent confusion.

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