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

No annotations exist, so the description carries the full disclosure burden; 'Retrieve' reasonably implies a read-only operation, and the note about returned fee fractions (decimals in [0,1]) adds unit/format context beyond the schema. It says nothing about permissions, error behavior for a missing/invalid id, or record size, so it only partially covers the behavioral surface.

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?

Two tightly written sentences with the core action front-loaded and id sourcing trailing. 'Returns full record' is mildly vague, which is the only thing keeping this from a 5.

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 one-parameter read tool with no output schema, the description covers what is fetched, the key returned field semantics, and where the id comes from. Only minor gaps remain (auth requirements, behavior on unknown ids), which is appropriate for a tool of this simplicity.

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% and the single parameter already documents itself as a UUID sourced from list_venture_platforms. The description restates that same provenance rather than adding new syntax or constraint detail, so the schema is doing 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?

Specific verb ('Retrieve') plus resource ('a single venture platform') and a scoping qualifier ('by id'), which cleanly separates it from a list-style sibling. It does not explicitly name a tool it is not, but the phrase 'Obtain the platformId from list_venture_platforms' effectively signals the list/get division of labor.

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 a clear prerequisite ('Obtain the platformId from list_venture_platforms'), which tells the agent both when to use this tool and where its input comes from. There are no explicit exclusions or failure-path guidance, which keeps it out of 5 territory.

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