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

No annotations are provided, so the description carries the full behavioral burden. It implies a read-only lookup but never states whether an empty query returns all calendars, how matching works (exact vs substring), or what a caller gets back beyond 'ids'.

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 with no filler; the resource and its facets come first. Nothing to trim, though it could afford one more clause given how little it says.

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 two-parameter, no-output-schema lookup this is close to adequate, and 'find calendar ids' does convey the return type. But with zero annotations and zero schema coverage, the description should say more about matching behavior and the no-argument default.

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 0%, so the description must compensate, and it partly does: it maps the opaque 'q' string to name/country matching and echoes the enum values for 'type'. It still omits matching syntax and whether 'q' searches multiple fields simultaneously, leaving real gaps.

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 ('Find') plus the resource ('calendar ids') and the three searchable facets, so the agent knows exactly what it retrieves. The sibling set (business-day and holiday math tools) is disjoint enough that no explicit differentiation is needed, though none is provided.

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?

No guidance on when to reach for this tool versus the other calendar-adjacent siblings (list_holidays, is_business_day), and no note on whether it is a prerequisite step for resolving a calendar id elsewhere. Usage is only implied by the verb.

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