verify_url

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

With no annotations, the description carries the full burden and does substantial work: it discloses the signed-packet output format, the Ed25519 signature, timestamping, and the independent-verification path against a published public key. It implies a read-only observation but does not state auth requirements, rate limits, timeout behavior, or how failures (DNS/TLS errors) are surfaced.

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?

Two sentences, zero filler. The output enumeration is front-loaded before the usage clause, so an agent scanning the first line immediately learns what it gets back.

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 one-parameter tool with no output schema and no annotations, the description compensates well by describing the return packet contents in detail, which the missing output schema would otherwise leave opaque. Remaining gaps are operational: auth, rate limits, and error handling.

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?

Only one parameter and schema description coverage is 100% — the schema already states 'The public http(s) URL to observe and prove.' The description's 'public web page' merely restates that constraint, adding no format, protocol, or edge-case detail 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 ('Observe') and resource ('public web page') and then enumerates exactly what the tool produces: HTTP status, page title, body SHA-256, DNS resolution, TLS certificate details, Ed25519-signed and timestamped. An agent knows precisely what this tool does and what it returns without opening anything else.

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?

Explicitly names the triggering scenario: 'Use when you need verifiable evidence of what a webpage contained — e.g. to back a claim with proof instead of asking to be trusted.' There are no siblings to route away from, so the absence of alternatives is not a gap, but there is no when-not guidance (e.g. non-public URLs, pages behind auth).

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