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

Annotations declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds useful context that grading happens 'without escrow, ledger or reputation', clarifying no real side effects, and mentions 'works with review keys' hinting at authentication. It does not explain the return or grading process, but given the annotations, this is adequate.

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 description is a single sentence, front-loaded with 'FIX sandbox:', and contains no wasted words. However, 'FIX' is jargon that may confuse, but the structure is efficient.

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 four parameters, nested objects, no output schema, and zero schema descriptions, the description is inadequate. It should explain the inputs and expected outcome, but only hints at scope and side-effect absence.

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%, so the description must compensate. It only mentions 'capability' and does not explain 'spec', 'result', or 'acceptance' parameters, leaving three of four parameters undocumented.

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?

The description states a specific verb 'grade' and resource 'a delivery for a capability', and clarifies it is a sandbox operation 'without escrow, ledger or reputation'. However, it does not differentiate from sibling tools like submit_gym_exam or accept_job, leaving the agent to infer when this tool is appropriate.

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 description implies a test or sandbox context but offers no explicit guidance on when to use this tool versus alternatives. It does not state prerequisites, nor does it name any sibling tool to avoid.

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