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

With no annotations at all, the description carries the full behavioral burden and does not meet it. It never mentions that a counterparty wallet, nonce, and cryptographic signature are required for the counter, nor what happens to the original offer, whether the counter expires, or what success/failure looks like. 'Open offer' is the only precondition disclosed.

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 front-loaded sentence with no wasted words, which is structurally good. However, brevity here shades into under-specification given an 8-parameter mutation tool, so it is adequate but thin rather than exemplary.

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 an 8-parameter, 4-required mutation tool with no annotations, no output schema, and 0% schema coverage, the description is far too sparse. It omits the signing/auth requirements, the enum constraint on currency, and the semantics of required fields, leaving the agent without what it needs to invoke the tool reliably.

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% across 8 parameters, so the description must compensate and largely does not. It loosely maps to price, currency ('token'), and eta_hours, but says nothing about offer_id, note, or the required wallet/nonce/signature signing parameters, leaving half the surface undocumented in both schema and description.

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?

Clear verb+resource: 'Counter an open offer from the other party' with the mutable aspects named (price/token/ETA). It also implies the precondition that an offer must already exist and be open, which helps separate it from make_offer. It does not explicitly name the sibling alternatives (accept_offer, make_offer), so it falls short of a 5.

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 explicit when-to-use guidance: nothing tells the agent to choose counter_offer over accept_offer, make_offer, or request_quote, nor what state the offer must be in. Usage is only inferable from the phrase 'an open offer.' No prerequisites or exclusions are given.

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