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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint. The description adds valuable behavioral constraints beyond annotations: only public INMAR records are accessible, IDs must come from search, and arbitrary URLs/private data/file access are prohibited. This helps the agent understand the tool's boundaries without contradicting the annotations.

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?

A single front-loaded sentence communicates the core action and source of the id, followed by a concise set of exclusions. Every word earns its place with no redundancy.

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-only tool with strong annotations, the description is complete: it states what to read, where the id comes from, and what is explicitly out of scope. No output schema exists, but 'Read a record' sufficiently implies the return value for this simple fetch operation.

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 0%, so the description must carry the semantic burden. It does so by clarifying that the single 'id' parameter must be a public INMAR record id returned from search. This adds meaningful provenance information beyond the raw schema definition.

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 ('Read'), a specific resource ('public INMAR record'), and a precise input source ('by id returned from search'). It clearly differentiates from the sibling tool 'search' by indicating this tool reads one record by id rather than searching.

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 tells the agent to use IDs returned from search, and explicitly excludes arbitrary URLs, private data, and file access. This provides clear context for when to use the tool, though it does not explicitly name 'search' as the alternative or state a formal when-not-to-use rule.

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