Dated proof of what existed at time T (PAID $0.01)

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

Annotations already flag openWorldHint=true and idempotentHint=false, and the description usefully adds the payment profile: $0.01 USD via x402 on Base (eip155:8453) through POST /v1/x402/anchor. That paid/external-rail context is real value beyond the annotations, though it omits what a repeat call does or whether the anchor is permanent.

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 compact lines, front-loaded with the value proposition and followed by route and pricing. Slight redundancy between the title/description text, but nothing wasteful.

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 explained, and cost plus endpoint are covered. What is missing is the substantive scope of the anchor (what corpus or artifact the proof attests to), which for a one-parameter paid tool is the key ambiguity an agent must resolve.

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 coverage is 100% and the single `date` parameter already documents format (YYYY-MM-DD) and the empty-means-today default, so the schema carries the load. The description adds no further semantics about the date, such as whether future dates are rejected or whether a date anchors a specific historical snapshot.

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 states what the tool produces in conceptual terms ("dated proof of what existed at time T") plus a concrete route, so the verb/resource is inferable as an anchoring operation. But it never says what is being anchored (a corpus, a document, an index snapshot) and gives no differentiation from nearby siblings such as v1_corpus_anchor or v1_x402_index.

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?

There is no statement of when to call this versus v1_corpus_anchor, v1_x402_quote, v1_x402_index, or v1_data_signed_snapshot. The only context offered is cost and transport (route, price, chain), which tells an agent how to pay but not when this tool is the right choice.

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