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

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered. The description adds real behavioral value beyond that: the two data sources (TrueFX live ticks for 10 majors, frankfurter.app ECB daily fallback for the other ~30 currencies) and the availability/failure contract (available=false plus error when no rate exists).

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?

Front-loads the core purpose and the key routing rule before the data-source and return-value details. Dense but each clause carries information; the sourcing/return enumeration is slightly long but earns its place given there is no output schema.

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?

There is no output schema, so the description compensates by enumerating the return fields (accountCurrency, pipValueAccount, fxRate, fxSource, available/error). Combined with the routing rule and data-source disclosure, an agent has everything needed to call it correctly.

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 all three parameters are already documented in the schema, giving a baseline of 3. The description reinforces how accountCurrency drives the FX conversion and that units is a base-currency position size, but adds no syntax or format detail beyond the schema.

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: computes the value of 1 pip for a forex pair and position size, converted to an account currency via a live FX rate. It explicitly distinguishes itself from the sibling workflow.run_forex_pip_value and names the exact use case.

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?

Gives an explicit trigger ('Use when user asks what's 1 pip worth in my account currency?') and an explicit exclusion with the alternative: when the account currency matches the pair's quote currency, use workflow.run_forex_pip_value alone. Nothing is left to inference.

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