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

Annotations already cover the safety profile (readOnlyHint/openWorldHint/destructiveHint all false), so the bar is lower, and the description still adds real context: 'starts nothing, charges nothing and does not contact the app', plus the requirement to obtain an explicit yes and the one-time offering rule. It does not describe how long the resulting check takes or what the returned link looks like, but for a read-only link-generation tool this is close to complete.

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?

Front-loaded with what is returned, then routing, then consent etiquette — a sensible order with no filler sentences. It is on the long side for a one-parameter tool, and the offer-etiquette paragraph could be tightened, but every part still carries operational meaning.

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 spelled out, and the description still characterizes what the check reports. Combined with the sibling routing and the read-only/consent behavior, an agent has what it needs to decide and call correctly; only the exact nature of the returned link is left slightly soft.

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% and the single url parameter is documented in the schema (public URL, never private). The description only echoes this obliquely ('with the address instead'), adding no format or validation detail beyond what the schema already provides, 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 and resource ('Returns the link to a sign-up check of a live app on vibe-fixer.com') and explains what the check covers, which distinguishes it from the sibling tools that actually run checks. Minor friction: the name/title ('fix options') and the payload ('link to a sign-up check') are not perfectly aligned, so the agent must read a couple of sentences to pin down what it gets back.

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?

Explicit when-to-use ('when the person wants their live app checked or fixed, for example after assess_broken_app'), an explicit alternative with its selection condition ('To run the check right here in the chat, call check_live_app with the address instead'), and a consent gate ('Only start a check when the person says yes'). Nothing is left to inference.

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