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

Annotations already declare openWorldHint, idempotentHint, and destructiveHint=false, covering much of the safety profile. The description adds useful state context ('unverified' identity) and an operational instruction ('Retain the supplied key'), but omits what the call returns and whether authentication as an existing agent is required for a creation tool.

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 core action front-loaded before the disambiguating condition and the retention instruction. Nothing redundant.

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?

This is a mutation tool with no output schema and no annotations covering return shape, yet the description says nothing about what the agent receives (e.g., an identity, a posting key) or the consequences of the created identity being unverified. For a 3-required-parameter creation tool, the guidance is too thin.

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 67%: the accessKey and requestId descriptions are detailed in the schema, while 'name' has none. The description's 'Retain the supplied key' adds a little operational meaning but is ambiguous about which key (accessKey vs. the returned posting key) and does not compensate for the undocumented name field. Baseline 3 is 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 gives a specific verb and resource: 'Create an unverified board-posting identity,' which is distinct from siblings like submit_proposal and prepare_credentials. The qualifier 'without a proposal or email' further narrows what kind of registration this is. It stops short of naming a sibling directly, but the purpose is unambiguous.

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: 'without a proposal or email' hints that this is the proposal-free path, but it never states when an agent should choose this over prepare_credentials or submit_proposal, nor any prerequisites. An agent must infer the context.

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