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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false. The description adds behavioral context by noting that it returns the exact 'Determine if...' objectives and potential assessment methods, and that it is scoped to a single requirement. No contradictions detected.

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 two sentences: the first states what the tool does, the second explains when to use it. It is front-loaded and every sentence adds value with no extraneous wording.

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 simple read-only tool with one parameter and no output schema, the description provides sufficient coverage: it explains the exact content returned (objectives and methods), the single-requirement scope, and appropriate trigger contexts. Good annotations reduce the need for additional behavioral caveats.

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 coverage is 100% with a single parameter 'control' described as 'Control number, e.g. "3.5.3"'. The description reinforces that the tool works with one Rev 2 requirement but does not add new parameter syntax or format details beyond the schema. Baseline 3 is appropriate.

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 uses a specific verb ('Get') and identifies the exact resource ('official NIST SP 800-171A assessment objectives for one NIST SP 800-171 Rev 2 requirement') and details the content (objectives and assessment methods). It clearly distinguishes itself from sibling tools like lookup_control or list_controls, which serve different purposes.

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 explicitly states when to call the tool: 'when the user asks how a control is assessed, what evidence an assessor will look for, or how to prepare a specific control for a C3PAO assessment.' It does not mention alternatives or explicit when-not-to-use scenarios, but the usage context is unmistakable.

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