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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safe, read-only behavior is fully captured. The description adds value by stating the access control rule (only returned if caller is assignee or participant) and that inaccessible IDs return 404, which is not in annotations. No further behavior (e.g., rate limits, partial results) is needed, making this score appropriate.

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 short paragraphs, front-loaded with the purpose. Every sentence earns its place: the first sentence states the purpose, the second provides usage guidelines with sibling reference, the third explains behavior (access control), and the fourth lists key fields to read. No filler or 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?

The tool has one simple parameter, high schema coverage, a good annotation set, and an output schema. The description covers purpose, usage guidelines, access control, and key return fields. Given the low complexity and full support from structured fields, nothing is missing.

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 the schema already documents the single `id` parameter as 'Action Item ID'. The description adds nuance by specifying that `id` is expected in `{id}` placeholder notation and that it should be a specific action item ID, but since schema coverage is complete, little extra is needed. Baseline 3 is correct.

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?

Tautological: description restates name/title.

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 says 'Use this when the user asks about a specific action item; use listActionItems to see all tasks.' This provides a sharp when-to-use/when-not-to-use rule and names the alternative sibling. It also specifies that inaccessible IDs return 404, guiding error handling.

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