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

Annotations already cover the mutation profile (readOnly=false, destructive=false, idempotent=false). The description adds the hold concept and how to release it, but its numeric details (default 10, max 60) merely restate the schema, and it says nothing about what happens if the hold has already lapsed or what a repeated call does.

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?

Very tight: the core action and the minutes constraint come first, followed by one short sentence of context and one of follow-up. The second sentence is fragmentary but earns its place by explaining why the tool exists.

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 should carry the whole burden, and it covers purpose, the token source, and the release path. It omits what the call returns and how failures (expired checkout, exceeding the cap) behave, which keeps it short of complete.

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 token, address, and minutes including bounds. The description repeats the minutes default/cap and the token source rather than adding format or edge-case meaning, so the baseline 3 applies.

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+resource ('Keeps an account from check_out_account held for longer') and names the mechanism (minutes from now). It explicitly ties itself to check_out_account and return_account, so an agent can distinguish it from those siblings without reading schemas.

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 triggering condition ('For a test that runs past the hold') and a lifecycle follow-up ('give it back with return_account when done'). It does not state a when-not or a fallback for an already-expired hold, so it falls short of a 5.

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