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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is fully covered by structured data. The description adds genuine value beyond that by disclosing the deduplication intent, which is not expressible in annotations. However, it says nothing about result volume, pagination, or what a 'check' contains – though the output schema mitigates the latter.

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, and the usage trigger is front-loaded immediately after the resource statement. The opening fragment is slightly under-specified rather than padded, so brevity is well judged for a no-argument listing tool.

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 zero parameters, an output schema, and full annotation coverage, the description only needs to establish purpose and calling context, which it does. The one remaining gap is that it never confirms the listing is unfiltered/complete, which matters for the duplicate-detection workflow it prescribes.

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?

The tool takes zero parameters, so there is no parameter semantics to explain; the baseline of 4 applies. The description's only free-text claim – the 'this workspace' scoping – is the sole implicit input context, and it is consistent with the empty schema.

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?

"Checks in this workspace" names the resource and its scope but omits the verb entirely – it reads as a noun phrase rather than stating that this lists checks. The agent can infer the enumeration behavior from the tool name `list_checks`, but the description alone does not carry it. Sibling differentiation is partial: it implicitly contrasts with `get_check` (single check) and `create_check`.

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?

Explicitly states when to call it: before `create_check`, to avoid adding a duplicate check for an already-watched URL. That is a concrete, actionable trigger naming a specific sibling. It lacks any when-not-to-use guidance (e.g. after the set is known, or for large workspaces), so it falls short of a 5.

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