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

Annotations declare readOnlyHint=false and idempotentHint=false, which is otherwise surprising for a tool named 'verify', and the description earns credit for explaining it: a third party records/anchors the price pre-quote and the returned record carries a SHA-256 hash of the computation. It adds tamper-evidence and jurisdictional scope beyond the structured fields, though it does not say whether repeated calls produce distinct receipts (relevant given idempotentHint=false) or what auth the anchoring requires.

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?

The core claim (returns a fair price with a SHA-256 hash) is front-loaded, which is good, but the description is then padded with duplicated Japanese/English prose and brand-concept language (HORIZON SHIELD, PTKA) that restates the same idea twice without adding operational detail. It is longer than the single-parameter tool warrants.

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 shape need not be described, and the annotations cover the safety/idempotency profile. The description supplies the domain scope and the tamper-evidence mechanism, leaving only minor gaps around repeat-call behavior and any prerequisite attestation source.

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% for the single 'work' parameter, including a concrete example, so the schema already carries the semantics. The description adds only the domain hint that pricing is Japan-based; it contributes nothing about the 'work' string's expected granularity beyond what the schema shows.

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 a concrete verb and resource — it returns a fair price as a tamper-evident record with a SHA-256 hash — and adds the domain constraint (Japan price data) plus the PTKA framing that explains why the record is trustworthy. It does not name or distinguish itself from close siblings such as get_price_range, preview_reverse_estimate, or get_fair_price_sources, so an agent still has to infer the boundary from the name alone.

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?

It gives one positive trigger: 'Use when an agent needs to verify price authenticity.' There is no when-not guidance and no named alternative, even though verify_integrity_claim and get_price_range occupy adjacent territory. Usage is implied rather than bounded.

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