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

Annotations already declare openWorldHint=true, readOnlyHint=false, and idempotentHint=false; the description usefully adds that the output is a public web page, which is the key side effect. However, it omits important mutation context: whether each call generates a new/duplicate link, whether the page can be revoked, and any auth requirements.

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?

A single front-loaded sentence stating the action and the resulting artifact, with no wasted words. Size is appropriate for the tool's simplicity.

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 non-idempotent mutation whose primary purpose is to produce a shareable link, yet with no output schema the description never says what is returned (e.g., a URL) or how repeated calls behave. Combined with the absence of usage guidance, it leaves real gaps for an agent calling a write tool.

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 explains 'component', 'data', and 'token' (including that the token comes from the result's _meta). The description adds no parameter meaning beyond that, 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?

States a specific verb ('Creates') and resource ('a public fplcopilot.com page for an FPL Copilot card'), and the sharing intent is unambiguous. It is clearly distinguished from the read-only sibling tools, though it doesn't name any sibling explicitly.

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 indication of when to use this vs other tools, no prerequisites, and no mention of whether the card must exist first or whether a token is required for non-shared cards. Usage must be inferred from the title 'Share this card'.

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