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

Annotations already cover readOnly/idempotent/non-destructive safety. The description goes beyond them by disclosing ordering ('newest first'), the exact scope of pattern (every path below the given path), and that results paginate via limit/offset. It does not discuss auth or rate limits, but the added behavioral context is meaningful.

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?

Telegraphic and front-loaded: the core behavior and ordering lead, followed by path forms, pattern scope, and pagination. Every clause carries information, though the fragmentary style reads more like notes than prose.

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?

With annotations covering safety and no output schema, the description supplies what an agent needs: ordering, path semantics, glob scope, and pagination. It stops short of hinting at the returned entry shape, a minor omission for a list tool with 4 optional params.

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 baseline is 3, but the description exceeds it: it explains each path variant with concrete examples ('Work/', 'Work/Acme/', 'Work/Habits.app') and clarifies pattern semantics ('**/*.md', 'Work/**', '**/*invoice*') beyond the schema's terse 'A glob, like "**/*.md"'. This materially improves correct invocation.

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 and resource with scope: 'Lists like a file browser, newest first.' An agent immediately understands the operation and its ordering semantics. It stops short of differentiating itself from sibling 'search' or 'fetch', which is the only gap.

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 implicitly guides usage by enumerating the valid path forms (folder, note's folder, app, Recently Deleted) and the meaning of pattern as a glob over everything below the path. However it never states when to use list versus search or fetch, nor any when-not condition. Usage is implied rather than explicit.

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