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

With no annotations supplied, the description carries the full burden and does more than most: it discloses the deterministic formula, the returned field (direction=inflate), and a commercial constraint (5 free trial calls per signed wallet). It stops short of covering failure modes, paid-tier behavior after the trial, or wallet-signing requirements in any detail.

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 operative content (formula, inversion, return field) is front-loaded and short. The doubled 'Inflation Adjust: Inflate:' lead-in and the emoji pricing tag add minor noise but no real length problem.

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 a tool with six undocumented, all-optional string parameters and no annotations or output schema, the description should clarify which parameters are actually required and how the aliases relate. It explains the math and the return field well but leaves the calling contract underspecified, which is exactly where an agent is most likely to fail.

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 six parameters are all optional strings. The formula only clearly maps value, rate, and years; the purpose of 'n', 'present', and 'inflation' is never addressed, so an agent must guess whether 'present' aliases 'value' or 'inflation' aliases 'rate'. This is a real ambiguity the description could have resolved in one sentence.

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 and resource ('Inflate: project a PRESENT amount forward to a future nominal value') and gives the exact formula value * (1+rate)^years, so the computation is unambiguous. It also names the sibling it inverts ('Opposite of x402-inflation-adj'), letting an agent distinguish the two without opening either schema.

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 'Opposite of x402-inflation-adj' clause effectively routes the agent: use this to move a present amount forward, the sibling to discount a future amount back. There is clear context for when to reach for this tool, though no explicit when-not conditions or prerequisite statements beyond the free-trial note.

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