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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world behavior, so the safety profile is covered. The description adds nothing behavioral beyond that: it does not mention pagination auto-fetch behavior, result ordering, or what an unfiltered call returns, despite those being relevant to correct invocation.

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, front-loaded with the purpose and then the filtering options; nothing is padded. It stops just short of being maximally useful because the second sentence is largely redundant with the schema parameter descriptions.

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, unparameterized-required list tool with a fully documented schema, the definition is minimally adequate. With no output schema, however, it could usefully say what a location assignment record contains (e.g., project-location pairing) and confirm behavior for an unfiltered call, which it omits.

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% – all four parameters are documented in the schema, including the auto-pagination semantics of page/per_page. The description restates project_id and location_id as filters without adding format, default, or combinatorial detail, so the schema does the real work.

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 ('List location assignments for projects'), which is more informative than the plain title. It does not explicitly distinguish itself from siblings such as get_project_location or list_projects, but the resource ('location assignments for projects') is narrow enough to be unambiguous.

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 second sentence implies how the tool is scoped (filter by project_id or location_id), which gives some usage signal. However, it never says when to use this list tool versus get_project_location or a broader list_locations, and there are no stated preconditions.

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