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

Annotations already cover the safety profile (readOnlyHint, idempotentHint, openWorldHint=false), so the bar is lower, and the description still adds real edge-case semantics: duplicate IDs are deduplicated and unknown UUIDs are silently skipped rather than erroring. It does not disclose result ordering or whether an invalid project_id fails the whole call, which keeps it from a 5.

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?

Two short sentences, no filler, with the primary action front-loaded and the dedup/skip caveat immediately after. Every clause carries information an agent can act on.

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 a full schema, an output schema, and rich annotations, the description supplies the one non-obvious behavior (silent skipping of unknown IDs) that an agent needs to interpret results. Only minor gaps remain around ordering and project membership constraints.

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% and both parameters are documented there, so baseline 3 applies. The description reinforces that lookup is by UUID but adds no format, cardinality, or batching limits beyond the schema, and says nothing specific about project_id.

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 (fetch), resource (requirements), and lookup key (UUID), plus the batch nature ('multiple ... in one call'), which implicitly separates it from the singular requirements_get and the list-based requirements_list. It stops short of naming the sibling alternative explicitly, which is what a 5 requires.

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 only implied: the batch-by-ID framing suggests 'use when you already have known UUIDs', but the description never states when to prefer this over requirements_list or requirements_get, nor any prerequisites (e.g., all IDs must belong to one project).

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