Signed Snapshot

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

Annotations already declare readOnlyHint=false, openWorldHint=true and non-idempotency, so the safety profile is covered. The description adds genuinely useful context the annotations lack: it is a remote POST endpoint costing 0.30 USD paid in x402/base/USDC on eip155:8453. It still says nothing about what the call does to state or what the signature guarantees.

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 short lines with zero filler and the route/pricing front-loaded, which is good. But the brevity is under-specification rather than efficiency; the space saved on explanation is space an agent needs in order to invoke it correctly.

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 described, but the description omits what the tool produces conceptually, what the four inputs mean, and what 'signed' entails — for a paid, open-world data endpoint that is a large gap. Only the route and price are complete.

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 0% and the description provides no explanation of series, sources, subject or fetched_at. For a 4-parameter tool with completely opaque field names and array defaults, the description must compensate and does not at all.

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 restates the title ('Signed Snapshot') and then gives a route and price; it never says what a signed snapshot is, what gets snapshotted, or what 'signed' attests to. With siblings like v1_signed_research, v1_market_snapshot and v1_data_freshness, an agent has no basis for choosing this one. Effectively tautological against the name/title.

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 statement of when to use this tool, no exclusions, and no mention of any alternative sibling. The only usage-adjacent detail is the remote route/price line, which tells the agent it is a paid endpoint but not when to call it.

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