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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so safety is covered. The description goes beyond them by naming what the quote yields (oracle spot rate output, minimum named trade, days to maturity, fixed APY a buyer locks) and clarifying withdrawal/duration semantics, adding real context for a quote call.

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 dense sentence, but the primary action ('Quote buying PT-USDG...') is front-loaded and the parenthetical explains the token inline. The trailing 'Read-only.' earns its place as a safety signal, though the em-dash chain is somewhat packed.

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?

With no output schema, the description compensates by enumerating the returned figures (spot-rate output, minimum, days to maturity, fixed APY), so an agent knows what a quote produces. Combined with the annotation-backed safety profile, an agent has enough to call it correctly; only explicit when-to-use routing is missing.

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%, so the schema already documents side, amount and slippage_bps including enum semantics and defaults. The description adds no extra parameter detail beyond what the schema provides, which matches the baseline 3 when the schema does the heavy lifting.

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 (quote) and resource (PT-USDG trade) and enumerates the three operations covered: buying, selling before maturity, redeeming after. It clearly distinguishes itself from the mutating siblings pt_buy, pt_sell and pt_redeem by being the quote/preview counterpart.

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 description says 'Read-only' and covers all three side modes, which implicitly positions it as the preview step before pt_buy/pt_sell/pt_redeem. However it never explicitly says to use this instead of those tools when you only want a price, nor states prerequisite conditions, so the routing guidance is implied rather than stated.

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