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

With no annotations, the description carries the full behavioral burden, and it does disclose the key trait that this is a live external network call rather than a cached lookup. It does not say whether the call requires auth, how slow or rate-limited it is, whether it persists an audit record, or how the 'mode' changes behavior. Useful but incomplete for an unannotated mutation-adjacent 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?

A single front-loaded sentence with zero filler and the essential verb/resource/return pattern up front. It is arguably too terse for a tool with an undocumented enum parameter, but nothing written is wasted.

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?

For a two-parameter tool with no annotations, no output schema, and an unexplained enum, the description does the minimum: it covers what is returned but leaves the mode taxonomy and any operational caveats (auth, latency, rate limits) entirely unaddressed. It is not sufficient for correct invocation when a required choice among four opaque modes exists.

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?

At 50% schema coverage, the description needs to compensate and does not. 'domain' is already documented in the schema, while 'mode' — a four-value enum (citerank, checkoutguard, agentguard, signalstrike) whose semantics are entirely opaque — is never mentioned. An agent cannot infer from the description what choosing a mode does or which to pick.

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: 'Run a live HTTP audit against a public domain'. The return values (score, grade, report URL) are also named, so an agent knows exactly what it gets. It doesn't differentiate from siblings, but the siblings listed (create_checkout_session, get_remediation_preview, guard_check_session) serve unrelated purposes, so the ambiguity risk is low.

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?

The word 'public' implies a scope constraint (no authenticated or internal targets), which is implicit usage guidance. However, there is no statement of when to reach for this versus get_remediation_preview or guard_check_session, and no prerequisites or cost warnings. Usage is inferred rather than stated.

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