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

Annotations already declare readOnlyHint: true, idempotentHint: true, and destructiveHint: false, covering safety. The description adds the bulk support capability, which is behavioral context beyond the schema. However, it does not explain behavior in failure scenarios or return structure, but given the strong annotation coverage, this is acceptable.

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 extremely concise, consisting of two short sentences. It front-loads the core purpose and adds only essential information about bulk support. No unnecessary words, perfectly aligned with minimalism.

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 is simple with only two parameters, and the description covers the essential functionality. However, it lacks specification of the return value format or error behavior, which would be helpful given no output schema. While adequate for a read-only getter, it could be more complete.

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. It mentions bulk support for project_ids, explaining that parameter's purpose. While project_id is not described, its meaning is evident from the name and context. The description adds partial semantic value, though it could be more explicit about parameter formats.

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?

The description uses a specific verb 'Gets' and a clear resource 'API URL for a project', distinguishing it from sibling tools like supabase_get_project which likely retrieves full project details. The mention of bulk support further clarifies its scope, making the purpose 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 description does not provide explicit guidance on when to use this tool versus alternatives. It mentions bulk support but no exclusions or alternative tool references. The usage context is implied by the purpose, but no explicit 'use this when' guidance is given.

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