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

Annotations already declare readOnly, idempotent, non-destructive, closed-world. The description adds useful context beyond annotations: that score reports reference {id}@{version} and that omitting version defaults to the most recent. It does not describe error behavior for unknown ids or response size, but the annotation coverage lowers the burden.

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-loaded with the action and resource, followed by the version hint and the reference format. The trailing 'CC BY 4.0.' is a licensing note of marginal relevance to invocation, slightly diluting conciseness.

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 two-parameter read tool with full schema coverage and clear annotations, the description covers purpose, version semantics, and version-reference format. Minor gaps are return shape (no output schema) and unknown-id behavior, but nothing critical for correct invocation.

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%, so both parameters are already documented. The description reinforces the semantics of version (pinning, default to latest) and the {id}@{version} reference format, which adds a little meaning beyond the schema but the schema does most of the work.

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+resource: 'Fetch one standards pack by id' and states what payload it returns (full per-provision V/E/S mapping). This clearly distinguishes it from the sibling list_standards_packs and from lookup tools.

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?

Usage is implied by 'by id' versus the sibling list_standards_packs, and the version-pinning guidance implies when to pass version. However, there's no explicit statement of when to prefer this over list_standards_packs or when not to use it.

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