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

With no annotations, the description carries the full burden and does disclose a non-obvious async flow: it may return pending_approval, the owner is emailed a link, and the caller must poll approval.status. It does not state that the return value is a sensitive credential to handle carefully, nor what auth is needed for non-production environments.

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?

Front-loads the purpose and packs the approval caveat and follow-up into a compact, semicolon-joined structure with no filler. Dense but readable, with nothing that wastes space.

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 2-param tool with no output schema, the description covers the key non-obvious behavior including the pending_approval return shape and the polling loop. Missing only auth/permission details for non-production envs and secret-handling guidance, which are minor gaps here.

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%, so both params (project, env) are already documented in the schema. The description references 'production' and 'environment' conceptually but adds no new parameter-level meaning beyond the schema baseline.

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+resource ('Get the DATABASE_URL for an environment') and adds the scope qualifier that it is the same value the app receives. It does not explicitly differentiate from siblings like env.secrets.list or db.query, which also touch environment data, but the purpose is 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?

Gives clear context for the approval path (production requires owner approval) and the follow-up action (poll approval.status). It stops short of naming when to prefer this over alternatives such as env.secrets.list, so it falls just below full when/when-not guidance.

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