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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered structurally. The description adds useful context beyond that: the page is loopback-only and supports two distinct signer flows. It does not say whether invoking it opens a browser or merely returns a URL, nor what the caller does next.

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 sentence with the action verb front-loaded and no filler. Every clause (loopback-only, NIP-07, NIP-46) carries information.

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 no parameters and no output schema, the description does need to convey what comes back, and it does — a loopback page for signer connection. The only gap is that it doesn't state what the agent should do with the returned URL (e.g. surface it to the user to open), which slightly weakens end-to-end completeness.

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?

The tool takes zero parameters, so the schema has nothing to document and the baseline is 4. There is no parameter-related meaning the description needed to supply.

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 (Return) and resource (the loopback-only setup page for connecting a NIP-07 extension or NIP-46 signer), which is concrete and actionable. However, the crowded sibling set (connect_bunker, begin_nostrconnect_pairing, approve_grynvault_browser_handoff) all touch signer connection, and the description does not explicitly say how this URL-returning tool differs from those.

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?

It implies the use case — getting the page used to connect a signer — but never states when to call this versus connect_bunker or begin_nostrconnect_pairing, nor any prerequisites or sequencing. Usage is left to inference from the two signer types mentioned.

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