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

With no annotations provided, the description carries the full burden and does well: it discloses that this is a write to a sensitive credential vault, that it is free, that it touches only one field, and that npub ownership proof is required. It omits reversibility (whether the field can be recovered) and any confirmation/rate-limit behavior, so not a 5.

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?

Short and front-loaded with the action first, then scope, then cost and auth requirements. Three fragments, each earning its place, though a slightly reformatted single paragraph would be tighter.

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 need not be described. For a 3-param, no-annotation mutation tool the description covers action, scope, cost, and authorization, leaving only reversibility/confirmation gaps. Adequately complete.

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%, so the schema already documents all three parameters in detail (including the dpop_token format requirements). The description only reinforces that a field is removed and proof is needed, adding little syntax or meaning beyond the schema. 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?

States a specific verb+resource ('Remove a single patron credential field') and clarifies scope by noting it deletes one field 'without affecting other fields,' which implicitly distinguishes it from beesknees_forget_credentials and beesknees_update_patron_credential. No sibling is named explicitly, so it stops short of a 5.

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?

Gives prerequisites (proof of npub ownership required) and a cost note ('Free'), but never states when to choose this over forget_credentials (remove all) or update_patron_credential (modify a field). Usage context is implied rather than spelled out.

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