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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, so the safety profile is covered. The description adds real value by disclosing what the response actually contains (multiTenant semantics, entity/field inventory, reference fields, working query filters), which annotations cannot convey. Minor gap: no note on whether the call can be expensive or on auth scoping.

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 tightly packed sentences with no filler; the capability summary comes first and the when-to-use / alternative routing follows. Every clause carries information that helps selection or interpretation.

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?

No output schema exists, but the description enumerates the returned sections (tenant model, entities, relationships, filters), so an agent knows what to expect. Combined with annotations covering the safety profile and a 100%-documented sole parameter, nothing needed to call it correctly is missing.

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% and the single project_id parameter is fully documented in the schema, including the whoami default fallback. The description adds no syntax or format detail beyond the schema, so the baseline 3 for schema-covered parameters applies.

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 (describe) and resource (project) and then enumerates exactly what the overview contains: tenant/data-sharing model, entities with fields, relationships, and active filter parameters. This is clearly distinguishable from list_entities, list_fields, and generate_openapi_spec, which are named directly.

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 says when to use it ('before writing app code') and names two alternatives with the condition that selects them: use this instead of piecing data together from list_entities + list_fields, and use generate_openapi_spec for the machine-readable REST contract.

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